TY - JOUR
A1 - Müller, M.
A1 - Kaiser, Martin
A1 - Stachowski, G.M.
A1 - Resch-Genger, Ute
A1 - Gaponik, N.
A1 - Eychmüller, A.
T1 - Photoluminescence quantum yield and matrix-induced luminescence enhancement of colloidal quantum dots embedded in ionic crystals
N2 - The incorporation of colloidal quantum dots (QDs) into solid matrices, especially ionic salts, holds several advantages for industrial applications. Here, we demonstrated via absolute measurements of photoluminescence quantum yields (PL-QY) that the photoluminescence of aqueous CdTe QDs can be considerably increased upon incorporation into a salt matrix with a simple crystallization procedure. Enhancement factors of up to 2.8 and a PL-QY of 50 to 80%, both in NaCl crystals and incorporated in silicone matrices, were reached. The fact that the achievable PL enhancement factors depend strongly on PL-QY of the parent QDs can be described by the change of the dielectric surrounding and the passivation of the QD surface, modifying radiative and nonradiative rate constants. Time-resolved PL measurements revealed noncorrelating PL lifetimes and PL-QY, suggesting that weakly emissive QDs of the ensemble are more affected by the enhancement mechanism, thereby influencing PL-QY and PL lifetime in a different manner.
PY - 2014
DO - https://doi.org/10.1021/cm5009043
SN - 0897-4756
SN - 1520-5002
VL - 26
IS - 10
SP - 3231
EP - 3237
PB - American Chemical Society
CY - Washington, DC
AN - OPUS4-31074
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Mitova, M.
A1 - Iliev, M.
A1 - Nováková, A.
A1 - Gorbushina, Anna
A1 - Groudeva, V.I.
A1 - Martin-Sanchez, Pedro Maria
T1 - Diversity and biocide susceptibility of fungal assemblages dwelling in the Art Gallery of Magura Cave, Bulgaria
N2 - Magura Cave, north-western Bulgaria, possesses valuable rock-art paintings made with bat guano and dated from the period between the Eneolithic and Bronze Ages. Since 2008, the Art Gallery is closed to the general public in order to protect the paintings from vandalism, microclimatic changes caused by visitors and artificial illumination, and the consequent growth of fungi and phototrophs. Nevertheless, some tourist visits are allowed under the supervision of cave managers. This study provides the first scientific report on cultivable fungal assemblages dwelling different substrata in the Art Gallery. A total of 78 strains, belonging to 37 OTUs (Ascomycota 81%, Zygomycota 13%, Basidiomycota 5%), were isolated in the study. This fungal diversity was clearly dominated by Penicillium (50% of strains) and Aspergillus (13%). The most relevant visible fungal colonies were detected in sediments rich in bat guano, where, besides Penicillium, other guanophilic fungi such as Mucor, Mortierella, Trichosporon and Trichoderma were dominant. Conversely, scarce fungi were detected on rock surface of painted walls. Based on the biocide susceptibility assay, octylisothiazolinone (OIT) and benzalkonium chloride (BAC) were effective inhibiting the in vitro growth of dominant fungal species in Magura Cave, when applied at concentrations ranged from 100 to 1,000 mg/L. These data provide a valuable knowledge about Magura fungi, and exemplify a type of preliminary test that may be conducted before planning any biocide treatment. However, considering the irreversible effects of biocides on the ecological balance in caves, and the low fungal contamination in painted walls of Magura Cave, there is no reason to use conventional biocides in this cave. Further studies, monitoring microbial communities and microclimatic parameters, should be conducted to improve the knowledge on microbial ecology in Magura Cave and possible human impacts, as well as to allow the early detection of potential microbial outbreaks.
KW - Fungi
KW - Rock-art caves
KW - Biocides
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-397436
DO - https://doi.org/10.5038/1827-806X.46.1.2061
SN - 0392-6672
VL - 46
IS - 1
SP - 67
EP - 80
PB - Scholar Commons
CY - Tampa, FL, USA
AN - OPUS4-39743
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - RPRT
A1 - Wiesler, F.
A1 - Hund-Rinke, K.
A1 - George, E.
A1 - Greef, J.-M.
A1 - Holz, F.
A1 - Hölze, L.E.
A1 - Hülsbergen, K.-J.
A1 - Martin, S.
A1 - Severin, K.
A1 - Spielvogel, S.
A1 - Geiger, P.
A1 - Nawotke, C.
A1 - Kehlenbeck, H.
A1 - Schenkel, H.
A1 - Adam, Christian
A1 - Bloem, E.
A1 - Frank, D.
A1 - Goldbach, H.E.
A1 - Heene, M.
A1 - Kratz, S.
A1 - Kruse, A.
A1 - Möller, K.
A1 - Pinnekamp, J.
A1 - Schoumans, O.F.
A1 - Vogel, Christian
A1 - Wulf, S.
T1 - Recyclingphosphate in der Düngung – Nutzen und Grenzen
N2 - Weltweit werden etwa 80–85 % aller abgebauten Rohphosphate für die Produktion von Düngemitteln verwendet. Bei noch steigendem Bedarf an Phosphor (P) geht man derzeit davon aus, dass die weltweiten P-Reserven noch über 200 Jahre ausreichen. Um den P-Vorrat langfristig abzusichern, sollte der in Reststoffen enthaltene Phosphor möglichst umfänglich genutzt werden. Dieser Forderung trägt das von der Bundesregierung 2012 erstmals beschlossene Deutsche Ressourceneffizienzprogramm ProgRess Rechnung. Rohphosphat wird auch seitens der Europäischen Kommission aufgrundseiner ökonomischen Bedeutung und des unsicheren Angebots als „kritischer Rohstoff“ eingestuft. Vor diesem Hintergrund hat die Bundesregierung in der Verordnung zur Neuordnung der Klärschlammverwertung vom 27. September 2017 in Deutschland eine verpflichtende technische Rückgewinnung von Phosphor für Abwasserbehandlungsanlagen ab einer Ausbaugröße von 100.000 Einwohnerwerten (12 Jahre nach Inkrafttreten der Verordnung) bzw. ab einer Ausbaugröße von über 50.000 Einwohnerwerten (15 Jahre nach Inkrafttreten der Verordnung) vorgeschrieben. Die Verordnung enthält keine Vorgaben hinsichtlich der anzuwendenden Technologie bei der Phosphorrückgewinnung. Ausgenommen von der Rückgewinnungspflicht sind Klärschlämme mit niedrigen Phosphorgehalten (weniger als 20 Gramm Phosphor je Kilogramm Klärschlamm-Trockenmasse). Auch die im Jahre 2017 verabschiedeten neuen Rechtsvorschriften für die Düngung verlangen zukünftig einen nachhaltigen und ressourceneffizienten Umgang mit Nährstoffen bei der landwirtschaftlichen Erzeugung und schränken die P-Zufuhr insbesondere auf hoch versorgten Böden ein (Düngeverordnung vom 26. Mai 2017). Dies wird zu einem mehr am Pflanzenbedarf orientierten und ggf. vermehrt überbetrieblichen Einsatz von wirtschaftseigenen Düngern führen. Um den politischen und gesetzlichen Anforderungen gerecht zu werden, müssen einerseits wirksame und kosteneffiziente technische Verfahren zum P-Recycling (weiter)entwickelt werden. Andererseits müssen die Recyclingprodukte die Anforderungen für eine direkte Verwendung in der Landwirtschaft oder als Rohstoff für die Herstellung von Düngemitteln erfüllen. In dem vorliegenden Standpunkt wird zunächst der potenzielle Beitrag von Reststoffen zur Deckung des P-Bedarfs in der deutschen Pflanzenproduktion geschätzt. Für die wichtigsten Reststoffe werden technische Verfahren zur P-Rückgewinnung bzw. Aufarbeitung skizziert. Auf Basis der Anforderungen der Landwirtschaft bzw. der Düngemittelindustrie
an die P-Recyclingprodukte werden deren Herstellungsverfahren bewertet. Schließlich wird der Regelungs- und Forschungsbedarf formuliert.
KW - Phosphor
KW - Düngemittel
KW - Diffusive Gradients in thin films (DGT)
PY - 2020
SP - 1
EP - 19
PB - Bundesministerium für Ernährung und Landwirtschaft (BMEL)
CY - Berlin
AN - OPUS4-51011
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Babutzka, Martin
A1 - Burkert, Andreas
A1 - Heise, Svenja
A1 - Heyn, A.
T1 - Korrosionsuntersuchungen mit gelartigen Elektrolyten an Zink - Eine innovative Prüfmethodik
N2 - Ein neuer Ansatz bei elektrochemischen Korrosionsuntersuchungen kann durch den Einsatz von gelartigen Elektrolyten als Alternative zu wässrigen Prüfelektrolyten beschritten werden. Gelartige Elektrolyte ermöglichen minimalinvasive Untersuchungen an natürlich gebildeten Zinkdeckschichten. Dadurch können korrosionsrelevante Kennwerte ermittelt werden, die Aussagen zur Deckschichtbildung und zur Stabilität von atmosphärisch gebildeten Deckschichten erlauben. In diesem Beitrag wird anhand verschiedener Untersuchungen an Reinzink der Mehrwert von gelartigen Elektrolyten für die Korrosionsforschung und -prüfung verdeutlicht. Darüber hinaus werden neue Erkenntnisse zur Deckschichtbildung von Zink unter atmosphärischen Bedingungen vorgestellt.
T2 - GfKORR-Jahrestagung 2019
CY - Frankfurt a. M.
DA - 12.11.2019
KW - Zink
KW - Gelartige Elektrolyte
KW - Korrosionsuntersuchungen
KW - Deckschichtbildung
PY - 2019
SN - 978-3-935406-71-0
SP - 53
EP - 64
AN - OPUS4-49642
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Neumann, Martin
A1 - Schilling, O.
A1 - Kuschke, Christian
A1 - Darnstädt, A.
A1 - Schubert, Sven
A1 - Günther, U.
A1 - Wille, Frank
T1 - Requirements for management systems for manufacturing of transport packages: the new revision of BAM-GGR 011 guideline
N2 - In accordance with IAEA SSR-6 para 306 a management system shall be established and implemented to ensure compliance with the relevant provisions of the IAEA regulations. BAM has issued an update of the guideline: the BAM-GGR 011. The new revision describes necessary quality assurance measures for design, manufacture, testing, documentation, use, maintenance and inspection of packagings for package designs requiring competent authority approval for the transport of radioactive material.
The measures can be categorised as system-related and design-related. They are independently approved and monitored by the German competent authority BAM and its authorised expert (BAM/T). The qualification of the organisation applying for the design approval certificate is reviewed in the context of the design approval procedure. The quality assurance measures for manufacture consist of three main steps. Pre-assessment of manufacturing documents such as quality plans, specifications etc., Manufacturing inspections according the pre-assessed documents and inspection before commissioning including documentation review. Periodic inspections during operation as well as relevant specifications for use and maintenance ensure that the properties specified in the approval certificate are preserved over the package life time. Special provisions for the return on
experience regarding operational feedback for design, manufacture, use, maintenance and inspection are given. Special focus shall be given here to the rearranged and meanwhile established system of manufacturing inspections. This includes more transparent roles for a) the Producers authorised inspection 11282 representative, b) the independent inspection expert (S), acting on behalf of the manufacturer with acceptance of BAM, and c) BAM or its authorised expert (BAM/T). Additional attention shall be drawn to the management of deviations during manufacturing and provisions for maintenance and periodic inspections.
T2 - 19th International Symposium on the Packaging and Transportation of Radioactive Materials PATRAM 2019
CY - New Orleans, LA, USA
DA - 04.08.2019
KW - Quality assurance
KW - Transport
KW - Manufacturing
KW - Surveillance
KW - Radioactive material
PY - 2019
SP - Paper 1128, 1
AN - OPUS4-49059
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Neumann, Patrick P.
A1 - Kohlhoff, Harald
A1 - Hüllmann, Dino
A1 - Krentel, Daniel
A1 - Kluge, Martin
A1 - Dzierliński, M.
A1 - Lilienthal, A. J.
A1 - Bartholmai, Matthias
T1 - Aerial-based gas tomography – from single beams to complex gas distributions
N2 - In this paper, we present and validate the concept of an autonomous aerial robot to reconstruct tomographic 2D slices of gas plumes in outdoor environments. Our platform, the so-called Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), combines a lightweight Tunable Diode Laser Absorption Spectroscopy (TDLAS) gas sensor with a 3-axis aerial stabilization gimbal for aiming at a versatile octocopter. While the TDLAS sensor provides integral gas concentration measurements, it does not measure the distance traveled by the laser diode’s beam nor the distribution of gas along the optical path. Thus, we complement the set-up with a laser rangefinder and apply principles of Computed Tomography (CT) to create a model of the spatial gas distribution from a set of integral concentration measurements. To allow for a fundamental ground truth evaluation of the applied gas tomography algorithm, we set up a unique outdoor test environment based on two 3D ultrasonic anemometers and a distributed array of 10 infrared gas transmitters. We present results showing its performance characteristics and 2D plume reconstruction capabilities under realistic conditions. The proposed system can be deployed in scenarios that cannot be addressed by currently available robots and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO).
KW - Aerial robot olfaction
KW - Mobile robot olfaction
KW - Gas tomography
KW - TDLAS
KW - Plume
PY - 2019
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-487843
DO - https://doi.org/10.1080/22797254.2019.1640078
SP - 1
EP - 16
PB - Taylor & Francis
CY - London
AN - OPUS4-48784
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Musil, B.
A1 - Böhning, Martin
A1 - Johlitz, M.
A1 - Lion, A.
T1 - On the inhomogenous chemo-mechanical ageing behaviour of nitrile rubber: experimental investigations, modelling and parameter identification
N2 - Elastomers are used in almost all areas of industrial applications, such as tires, engine mounts, bridge bearings, seals or coatings. During their use in operation, they are exposed to different environmental influences. These include, in particular, climatic factors such as air oxygen, high temperatures, light (UV radiation) and the influence of media (e.g. oils, fuels). A very important result of these factors is the chemical ageing of elastomers. In this case, the elastomer degenerates and changes its chemical structure in the aged regions, which leads to an irreversible change in the material properties in connection with the reduction in its usability. In this paper, chemical ageing of nitrile butadiene rubber (NBR) is investigated. Especially in case of thermo-oxidative ageing at elevated operating temperatures, the ageing processes run inhomogeneously. These effects are known as diffusion-limited oxidation (DLO) and are associated with the diffusion–reaction behaviour of atmospheric oxygen with the elastomer network. For these reasons, NBR samples are artificially aged in air and subjected to different experimental methods, which are presented and discussed. Additional results from inhomogeneous mechanical tests and permeation tests indicate the causes of the DLO-effect, show the influence of chemical ageing and are subsequently used for parameter identification in relation to the diffusion–reaction equation. A continuum-mechanical modelling approach is also presented here, which describes the finite hyperelasticity, diffusion–reaction processes as well as chemical degradation and reformation of the elastomer network. This multifield problem leads to a system of partial and ordinary differential equations and constitutive equations and is solved within the finite element method.
KW - Rubber
KW - Ageing
KW - Gas permeability
KW - DLO
KW - NBR
PY - 2019
DO - https://doi.org/10.1007/s00161-019-00791-1
SN - 0935-1175
SN - 1432-0959
VL - 32
IS - 1
SP - 127
EP - 146
PB - Springer
CY - Heidelberg
AN - OPUS4-48560
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Zakel, S.
A1 - Schröder, Volkmar
A1 - Askar, Enis
A1 - Gabel, D.
A1 - Hirsch, W.
A1 - Kleinert, J.
A1 - Krause, U.
A1 - Krietsch, Arne
A1 - Meistes, J.
A1 - Sachtleben, A.
A1 - Schmidt, Martin
T1 - Sicherheitstechnische Kenngrößen des Explosionsschutzes von hybriden Stoffgemischen - Normungsfähige Bestimmungsverfahren
N2 - In diesem Verbundvorhaben werden standardisierte Messverfahren für hybride Gemische erarbeitet, die der Bestimmung sicherheitstechnischer Kenngrößen des Explosionsschutzes dienen. Unter einem hybriden Gemisch wird dabei ein mehrphasiges System aus Brenngas oder brennbarem Dampf, sowie Luft und brennbarem Staub verstanden. Die Veröffentlichung der Ergebnisse erfolgt in einem Abschlussbericht und als DIN-Spezifikation (DIN SPEC). Diese DIN SPEC versetzt Prüfinstitute und Industrie in die Lage, Explosionsgefahren beim Betrieb technischer Anlagen mit hybriden Gemischen einzuschätzen und damit Prozesse sowohl sicherer als auch effizienter zu steuern. Dieses Projekt wird im Rahmen des WIPANOProgramms (Wissens- und Technologietransfer durch Patente und Normen) vom BMWi gefördert.
T2 - 14. Fachtagung Anlagen-, Arbeits- und Umweltsicherheit
CY - Köthen, Germany
DA - 07.11.2019
KW - Explosionsschutz
KW - Sicherheitstechnische Kenngrößen
KW - Hybride Gemische
KW - Normung
PY - 2019
SN - 978-3-89746-220-5
SP - 73
CY - Frankfurt am Main
AN - OPUS4-49954
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Schumm, A.
A1 - Martin, E.
A1 - Beaumont, M.
A1 - Ewert, Uwe
A1 - Kolkoori, Sanjeevareddy
A1 - Zscherpel, Uwe
A1 - Wrobel, Norma
A1 - Redmer, Bernhard
T1 - A comparative study on the performance of digital detector systems for high energy applications
N2 - For cast components reaching or exceeding total material thicknesses of 150mm, high energy sources such as linear accelerators or Betatrons are required in order to obtain reasonable exposure times. In this study, the performance of digital detector systems, involving imaging plates (IP) and digital detector arrays (DDA), was evaluated with respect to the testing class B requirements as formulated in the standard EN ISO 17636-2. As a reference, traditional radiographic film and a Cobalt-60 source was used. With film exposures, testing class B was achieved with Co-60 and Betatron (7.5 MV) at longer exposure times. The preliminary results show that the testing class B was not obtained with the examined digital detector arrays (DDA) and the high resolution imaging plates (IP) , even at 40, 60 and 80 minutes exposure time with a 7.5 MV Betatron. Class A was achieved using high resolution imaging plates with optimized metal filters between object and IPs and a high resolution DDA with intermediate Cu filters. Class A was also achieved applying a DDA with lower basic spatial resolution than required by Table B.13 of EN ISO 17636-2, but using the compensation principle as described in this standard. The next generation of digital detector arrays might potentially be able to obtain class B performance with the expected spatial resolution and sensitivity improvements.
T2 - ECNDT 2014 - 11th European conference on non-destructive testing
CY - Prague, Czech Republic
DA - 06.10.2014
KW - Radiography
KW - Image quality
KW - Betatron
KW - Digital detector array (DDA)
KW - Casting
KW - Standards
KW - High energy radiography
KW - Comparison of detectors
KW - Steel weldment
PY - 2014
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-323075
UR - https://www.ndt.net/?id=16394
SN - 1435-4934
VL - 19
IS - 12
SP - 1
EP - 6
PB - NDT.net
CY - Kirchwald
AN - OPUS4-32307
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Guilherme, A.
A1 - Buzanich, Günter
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Coroado, J.
A1 - Dos Santos, J.M.F.
A1 - Carvalho, M.L.
T1 - Synchrotron micro-XRF with compound refractive lenses (CRLs) for tracing key elements on Portuguese glazed ceramics
N2 - Several glazed ceramic fragments (XVIth to XVIIIth centuries) from two production centers in Portugal (Coimbra and Lisbon) were the object of this study. The ones from Coimbra comprise two sets of samples: faiences and tiles. The ones from Lisbon are only tiles (azulejos, in Portuguese). The three main divisions of such pieces are the ceramic support (body), glaze and surface decoration. The system decoration/glaze is not easy to investigate, due to the high heterogeneity resulting from the mixing procedures and firing temperatures used. Moreover, the ability of the pigment to diffuse into the base glaze varies depending on the composition of both the pigment and the glaze in terms of fusibility. In order to raster these effects, high resolution techniques are required. In this work, synchrotron micro-X-ray fluorescence (µ-XRF) analysis was performed to monitor the profiles of the characteristic elements from the colors used and the glaze in well prepared cross-sections of the samples. Key elements are: Co for blue, Mn for purple, Cu for green, Sb for yellow, Pb for the glaze and Fe for the body. The major difference observed is that faiences have glaze thicknesses between 150 and 200 µm and tiles have glaze thicknesses between 350 and 400 µm. Furthermore, in faiences all the pigments except the yellow ones are well dispersed into the glassy matrix, while in tiles, all of them are just partially diffused throughout the glaze. However, differences between the tiles from Coimbra and Lisbon were observed. In the samples from Lisbon, a higher intake from the pigment throughout the glaze is observed.
KW - Synchrotron micro-XRF
KW - Compound refractive lenses (CRLs)
KW - Portuguese glazed ceramics
PY - 2012
DO - https://doi.org/10.1039/c2ja30030c
SN - 0267-9477
SN - 1364-5544
VL - 27
IS - 6
SP - 966
EP - 974
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-26789
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bjeoumikhov, A.
A1 - Bjeoumikhova, Zemfira
A1 - Riesemeier, Heinrich
A1 - Radtke, Martin
A1 - Wedell, R.
T1 - Propagation of synchrotron radiation through nanocapillary structures
N2 - The propagation of synchrotron radiation through nanocapillary structures with channel sizes of 200 nm and periods in the micrometer size has been studied experimentally. It was shown that the propagation through individual capillary channels has a mode formation character. Furthermore it was shown that during the propagation through capillary channels the coherence of synchrotron radiation is partially conserved. Interference of beams propagating through different capillary channels is observed which leads to a periodically modulated distribution of the radiation intensity in a plane far from the exit of the structure. These investigations are of high relevance for the understanding of X-ray transmission through nanocapillaries and the appearance of wave properties at this size scale.
KW - Polycapillary structure
KW - Nanocapillary
KW - X-ray optics
KW - Wave properties
KW - Synchrotron radiation
KW - X-ray diffraction
PY - 2007
DO - https://doi.org/10.1016/j.physleta.2007.01.092
SN - 0031-9163
SN - 0375-9601
VL - 366
IS - 4-5
SP - 283
EP - 288
PB - North-Holland Publ. Co.
CY - Amsterdam
AN - OPUS4-20580
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tissot, I.
A1 - Troalen, L.G.
A1 - Manso, M.
A1 - Ponting, M.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Barreiros, M. A.
A1 - Shaw, I.
A1 - Carvalho, M.L.
A1 - Guerra, M.F.
T1 - A multi-analytical approach to gold in Ancient Egypt: Studies on provenance and corrosion
N2 - Recent results from a three-year multi-disciplinary project on Ancient Egyptian gold jewellery revealed that items of jewellery from the Middle Kingdom to the New Kingdom were manufactured using a variety of alluvial gold alloys. These alloys cover a wide range of colours and the majority contain Platinum Group Elements inclusions. However, in all the gold foils analysed, these inclusions were found to be absent. In this work a selection of gilded wood and leather items and gold foil fragments, all from the excavations by John Garstang at Abydos (primarily from Middle Kingdom graves), were examined using Scanning Electron Microscopy-Energy Disperse Spectroscopy (SEM-EDS), X-Ray Fluorescence (µXRF), Particle Induced X-Ray Emission (µPIXE) and Double Dispersive X-Ray Fluorescence (D²XRF). The work allowed us to characterise the composition of the base-alloys and also to reveal the presence of Pt at trace levels, confirming the use of alluvial gold deposits. Corrosion products were also investigated in the foils where surface tarnish was visually observed. Results showed that the differences in the colour of corrosion observed for the foils are related not only to the thickness of the corrosion layer but also to a multi-layer structure containing the various corrosion products.
KW - Gold
KW - Egypt
KW - PGE
KW - Provenance
KW - Corrosion
KW - muXRF
KW - muPIXE
KW - D2XRF
KW - SEM-EDS
PY - 2015
DO - https://doi.org/10.1016/j.sab.2015.03.012
SN - 0584-8547
SN - 0038-6987
VL - 108
SP - 75
EP - 82
PB - Elsevier
CY - Amsterdam
AN - OPUS4-33155
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lutz, C.
A1 - Hampel, S.
A1 - Beuermann, S.
A1 - Turek, T.
A1 - Kunz, U.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Investigation on Vanadium Species Distribution in Nafion™ 117 after Cyclization in a Vanadium Redox Flow Battery
N2 - The vanadium redox flow battery (VRFB) is currently a potential candidate for stationary energy storage. A major challenge is the unintended vanadium transport through the separator, which results in a fade of capacity. To overcome this issue, it is necessary to understand the transport processes in the membrane on a more fundamental level. In this work, the vanadium species distribution in Nafion™ 117 after cyclization was investigated. Two membranes, one from a charged VRFB and another from a discharged VRFB, were analyzed using ultraviolet–visible spectroscopy (UV/VIS) and X-ray absorption near edge structure spectroscopy (XANES). Little difference between the two membranes was recognizable according to the UV/VIS results. In comparison, the XANES results showed that the membrane from the charged VRFB contains more V3+ than VO2+, whereas for the discharged case, more VO2+ is present in the membrane.
KW - Synchrotron
KW - BAMline
KW - XANES
KW - Vanadium redox flow battery
PY - 2021
VL - 64
SP - 1
EP - 8
AN - OPUS4-54144
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Simons, C.
A1 - Mans, C.
A1 - Hanning, S.
A1 - Janßen, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Ostermann, Markus
A1 - Michaelis, Matthias
A1 - Wienold, Julia
A1 - Alber, D.
A1 - Kreyenschmidt, M.
T1 - Study on microscopic homogeneity of polymeric candidate reference materials BAM H001-BAM H010 by means of synchrotron µ-XRF and LA-ICP-MS
N2 - In this study the microscopic homogeneity of the newly developed plastic reference materials BAM H001-BAM H010 was investigated. The materials consist of an acrylonitryle-butadien-styrene terpolymer, doped with different amounts of the elements Br, Cd, Cr, Hg and Pb. For the quantitative determination of the degree of homogeneity, a procedure proposed by Kempenaers et al. (Fresenius J. Anal. Chem., 2001, 369, 733-737) was used. On every sample an extensive number of different points were analyzed and standard deviation for every element mentioned above was used to calculate a minimal sampling mass that is necessary to reach a certain level of uncertainty caused by inhomogeneity (mmin,5%). The experiments were taken out with synchrotron µ-XRF (SR µ-XRF) at BESSYII in Berlin and by laser ablation inductively coupled plasma mass spectroscopy (LA-ICP-MS). The calculated values for mmin,5% of both techniques showed comparable results for all elements. It could be shown that the materials are suitable for calibration of micro analytic techniques if at least 64 µg are used.
KW - XRF
KW - LA-ICP-MS
KW - RoHS
KW - CRM
PY - 2010
DO - https://doi.org/10.1039/b917008a
SN - 0267-9477
SN - 1364-5544
VL - 25
SP - 40
EP - 43
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-20938
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kühbacher, M.
A1 - Weseloh, G.
A1 - Bertelsmann, H.
A1 - Özaslan, M.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Kyriakopoulos, A.
A1 - Behne, D.
T1 - Analysis of metal- and metalloid-containing proteins by SRXRF at the BAMline
N2 - Pilot studies have been carried out at the BAMline at BESSY II in collaboration with the Bundesanstalt
für Materialforschung und -prüfung (BAM) on metal- and metalloid-containing compounds in biological
samples after electrophoretic protein separation. After sodium dodecylsulfate polyacrylamide gel
electrophoresis (SDS-PAGE) and transfer onto a blotting membrane the distribution of selenium among
the proteins of testis homogenate of a rat and a wallaby was determined. The comparison with the
autoradiogram of 75Se-labeled proteins separated in the same way showed that of nine seleniumcontaining
proteins found in rat testis homogenate by autoradiography four could be detected by
synchrotron radiation X-ray fluorescence analysis (SRXRF).
PY - 2003
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2002.pdf#page=333
SN - 0179-4159
SP - 333
EP - 335
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-2495
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Schäfer, D.
A1 - Simon, R.
T1 - SY-XRF study of Hans Baldung Grien silverpoint drawings and the silver stylus from the 'Karlsruhe sketchbook'
N2 - We performed spatially resolved synchrotron-induced x-ray fluorescence analyses (SY-XRF) of five silverpoint drawings from the famous `Karlsruhe sketchbook´ and a silverpoint, which is assumed to be an original one used by the Renaissance artist Hans Baldung Grien (1484-1545) himself. The silverpoint, one out of a very small number of ancient styli conserved nowadays, is fixed on the so-called `Karlsruhe sketchbook´. Measurements were executed at the FLUO-TOPO beamline at the electron storage ring ANKA. It has been shown, that SY-XRF at this beamline is nondestructive and sensitive enough for the analysis of minor and major elements in the silver strokes. This study provides new insights into this graphical technique and ancient drawing instruments: results are that three drawings have been created with a common type of silverpoint containing about (10.4 ± 0.7) wt% of Cu. In all the cases, Hg at a 10% level by weight was identified in the strokes. Presence of Hg is not due to the original silver alloy, but is a result of a general alteration phenomenon of silverpoint drawings. This fact is confirmed by the analysis of the original silverpoint, which contains only small traces of Hg. The result for the copper content of the silverpoint (10.4 ± 1.7) wt% is in good agreement with that of these three drawings. It is supposable that the silverpoint found attached today served for the creation of the corresponding drawings. Moreover, the graphical technique of Baldung is found to be continual over three decades. Only one very late drawing dated to 1543 was probably realized with another silverpoint, containing about 3 wt% of Cu. This difference in the chemical composition of drawings from the late period might be used as a more precise dating indicator of Baldung drawings that are not clearly attributed to a certain period.
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Silver stylus
PY - 2007
DO - https://doi.org/10.1002/xrs.963
SN - 0049-8246
VL - 36
IS - 3
SP - 173
EP - 177
PB - Wiley
CY - Chichester
AN - OPUS4-16150
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Vasilescu, A.
A1 - Constantinescu, B.
A1 - Stan, D.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Ceccato, D.
T1 - Studies on ancient silver metallurgy using SR XRF and micro-PIXE
N2 - This work presents a complex evaluation of a series of Geto-Thracian silver adornments found on Romanian territory, part of the 4th century BC Agighiol (Northern Dobruja) hoard and of an ingot from the 1st century BC Geto-Dacian Surcea (Transylvania) hoard, using Synchrotron Radiation X-Ray Fluorescence and micro- Proton Induced X-ray Emission analysis and mapping in order to investigate aspects related to the elemental composition of the metal and the metallurgy implied in their manufacture. One of the samples can be linked to Laurion as the source of metal, and several items contain silver probably originated in Macedonia. The set of silver items was found to be heteregenous as composition and microstructure, and corrosion-related elements could be also identified in the X-Ray maps.
KW - Synchrotron radiation XRF
KW - Micro-PIXE
KW - Archaeological silver
PY - 2015
DO - https://doi.org/10.1016/j.radphyschem.2015.07.008
SN - 0969-806X
SN - 0020-7055
SN - 0146-5724
VL - 117
SP - 26
EP - 34
PB - Pergamon Press
CY - Oxford [u.a.] ; Frankfurt, M.
AN - OPUS4-33809
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Denker, A.
A1 - Hahn, Oliver
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Röhrs, S.
A1 - Reiche, I.
A1 - Stege, H.
T1 - Chemie der Kunst - Zerstörungsfreie Analyse von Kunst- und Kulturgütern
N2 - Naturwissenschaftliche Informationen, insbesondere die chemische Zusammensetzung der Objekte, können Hinweise auf die Hintergründe der Objektherstellung liefern, die der alleinigen kunsthistorischen Begutachtung verborgen blieben. Es können nicht nur Fragen nach dem Prozess, Zeitpunkt und Ort der Herstellung beantwortet werden. Die chemische Analyse gibt auch Hinweise auf Ereignisse und Veränderungen, die erst nach der Fertigstellung des Objektes erfolgten. So werden Alterungsphänomene oder historische Überarbeitungen und Restaurierungen aufgedeckt, aber auch Konservierungsstrategien zur Erhaltung der Kunstwerke unterstützt. Durch den technologischen Fortschritt im Bereich der röntgenanalytischen Methoden, die berührungsfrei, ohne Probennahme und ohne Schädigung für das Untersuchungsobjekt arbeiten, erschließen sich dem Analytiker erstmalig Möglichkeiten, auch sehr wertvolle und fragile Objekte zerstörungsfrei zu untersuchen.
PY - 2003
DO - https://doi.org/10.1515/mt-2003-0003
SN - 0025-5300
VL - 45
IS - 11-12
SP - 485
EP - 503
PB - Carl Hanser Verlag
CY - München
AN - OPUS4-2745
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Qureshi, Navid
A1 - Morrow, Ryan
A1 - Eltoukhy, Samar
A1 - Grinenko, Vadim
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Onykiienko, Yevhen A.
A1 - Kulbakov, Anton
A1 - Inosov, Dmytro S.
A1 - Adler, Peter
A1 - Valldor, Martin
T1 - Noncollinear Magnetic Structures in the Chiral Antiperovskite β-Fe2SeO
N2 - We present the magnetic properties of the chiral, polar, andpossibly magnetoelectric antiperovskite β-Fe2SeO as derived from magnet-ization and specific-heat measurements as well as from powder neutrondiffraction and Mössbauer experiments. Our macroscopic data unambig-uously reveal two magnetic phase transitions at TN1 ≈ 103 K and TN2 ≈ 78K, while Rietveld analysis of neutron powder diffraction data reveals anoncollinear antiferromagnetic structure featuring magnetic moments inthe a−b plane of the trigonal structure and a ferromagnetic moment alongc. The latter is allowed by symmetry between TN1 and TN2, weakly visible inthe magnetization data yet unresolvable microscopically. While theintermediate phase can be expressed in the trigonal magnetic spacegroup P31, the magnetic ground state is modulated by a propagation vectorq = (1/2 1/2 0) resulting in triclinic symmetry and an even more complexlow-temperature spin arrangement which is also reflected in the Mö ssbauer hyperfine patterns indicating additional splitting of Fesites below TN2. The complex noncollinear spin arrangements suggest interesting magnetoelectric properties of this polar magnet.
KW - EXAFS
KW - Antiperovskite
KW - Magnetic structure
PY - 2024
DO - https://doi.org/10.1021/acs.inorgchem.4c02916
SN - 0020-1669
VL - 63
IS - 48
SP - 22712
EP - 22720
PB - American Chemical Society (ACS)
AN - OPUS4-63116
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Curado, Jessica
A1 - Radtke, Martin
A1 - Buzanich, Günter
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Guttler, R.A.S.
A1 - Rizzutto, M.A.
T1 - μ-SRXRF characterization of Brazilian emeralds
N2 - The aim of the present study is to characterize emeralds from different mines of Brazil by using Synchrotron Radiation X-ray Fluorescence Microanalysis (µ-SRXRF). The advantage of this technique is that we can analyze a homogeneous, inclusion free area of the stone with the microbeam to distinguish the elemental fingerprint according to the provenance of the emerald. A total of 47 samples belonging to 5 different Brazilian mines were studied in this work and 28 elements were identified. By means of Principal Component Analysis (PCA) it is possible to build different groups according to the provenance of the stones, which allows to assign samples of unknown origin to the according mine.
T2 - 22nd International congress on X-ray optics and microanalysis
CY - Hamburg, Germany
DA - 02.09.2013
KW - µ-SRXRF
KW - BAMline
KW - Emeralds
KW - Geoscience
PY - 2014
DO - https://doi.org/10.1088/1742-6596/499/1/012016
SN - 1742-6588
SN - 1742-6596
VL - 499
SP - 012016-1
EP - 012016-5
PB - IOP Publ.
CY - Bristol, UK
AN - OPUS4-30541
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Babutzka, Martin
A1 - Heyn, A.
T1 - Corrosion investigations by using gel-type electrolytes
N2 - Limitations are encountered regarding the electrolyte when studying atmospheric corrosion reactions on materials that form protective layers on their surface or tend to passivate. For example, the reconstruction of a thin wet film, as well as the interpretation of electrochemical measurements in so-called bulk solutions (a "mass" of electrolyte), often proves to be difficult in view of corrosion behavior under atmospheric conditions. A new approach to this problem in corrosion research includes the use of gel-type electrolytes as an alternative to bulk electrolytes. Gel-type electrolytes form a thin wet film on the surface of the material, whereby the naturally formed protective layer is affected similar to atmospheric conditions and can be examined in an almost non-destructive way. Through electrochemical instrumentation specific values such as polarization resistances and corrosion currents can be determined providing information on kinetics of surface layer formation and stability of surface layers formed under the influence of a thin wet film. Thus, new test methods can be developed that supply a better understanding of corrosion processes in specific atmospheres.
In this article different zinc coatings and aluminium alloys were investigated, their naturally formed protective layers were electrochemically characterized and corrosion relevant values were determined by using a gel pad based on polysaccharide. Corrosion relevant values allowed the differentiation of various coating systems and could describe the current protective effect provided by the coating. It is shown that gel-type electrolytes influence protective layers and coatings considerably less than corresponding bulk electrolytes and that an atmospheric wet film is approached by these test conditions. From the results it is evident that gel-type electrolytes represent a viable and promising field in corrosion research.
T2 - 18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium
CY - Chemnitz, Germany
KW - Corrosion investigations
KW - Gel-type electrolytes
KW - Zinc coatings
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-366680
DO - https://doi.org/10.1088/1757-899X/118/1/011002
VL - 118
SP - 17
PB - IOP Publishing
CY - Bristol, UK
AN - OPUS4-36668
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Merchel, Silke
A1 - Berger, Achim
A1 - Görner, Wolf
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Reiche, I.
A1 - Riederer, J.
A1 - Duval, A.
A1 - Guicharnaud, H.
T1 - Non-Destructive Investigations of Dürer's Silver Point Drawings by Pixe and SY-XRF
T2 - 7th International Conference on Non-destructive testing and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage ; art 2002
CY - Antwerp, Belgium
DA - 2002-06-02
PY - 2002
UR - http://srs.dl.ac.uk/arch/publications/reiche/reiche_fullcorr.pdf
SP - 82
AN - OPUS4-1400
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
T1 - Traces of Albrecht Dürer: Non-destructive analyses of Renaissance silverpoint drawings
KW - Nuclear industry
KW - Nuclear medicine
PY - 2004
SN - 92-0-114703-1
SN - 0074-1876
IS - 1181
SP - 138
EP - 142
PB - IAEA
CY - Vienna
AN - OPUS4-5548
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Röhrs, S.
T1 - Auf den Spuren Albrecht Dürers - Zerstörungsfreie Untersuchung von Silberstiftzeichnungen mittels Mikro-PIXE und Synchrotron-induzierter Mikro-RFA
T2 - Jahrestagung 2003 im Ethnologischen Museum Berlin-Dahlem
CY - Berlin, Deutschland
DA - 2003-03-12
PY - 2003
SN - 3-00-014223-1
SN - 0949-4057
SP - 118
EP - 120
CY - [Frankfurt am Main]
AN - OPUS4-2356
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Merchel, Silke
A1 - Berger, Achim
A1 - Görner, Wolf
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Vogl, Jochen
A1 - Frisch, A.
A1 - Reiche, I.
T1 - Kunst- und Kulturgüter unter "Beschuss"
T2 - GDCh-Jahrestagung Chemie 2003 ; Jahrestagung der Fachgruppe Nuklearchemie ; 19. Seminar Aktivierungsanalyse
CY - München, Deutschland
DA - 2003-10-06
PY - 2003
SN - 3-936028-14-1
N1 - Serientitel: Kurzreferate / GDCh-Jahrestagung Chemie 2003 – Series title: Kurzreferate / GDCh-Jahrestagung Chemie 2003
IS - 5
SP - 68
PB - Gesellschaft Deutscher Chemiker
CY - Frankfurt am Main
AN - OPUS4-2686
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Frisch, A.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Vogl, Jochen
ED - Röhrs, S.
T1 - Synchrotron-XRF und PIXE Untersuchungen an bronzezeitlichen Fussringen
T2 - Jahrestagung 2003 im Ethnologischen Museum Berlin-Dahlem
CY - Berlin, Deutschland
DA - 2003-03-12
PY - 2003
SN - 3-00-014223-1
SN - 0949-4057
SP - 101
EP - 103
CY - [Frankfurt am Main]
AN - OPUS4-2355
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Marabelli, M.
ED - Tabaso, M.
T1 - Spatially resolved SR-XRF analyses of complex drawings of the Holbein family
T2 - 8th International Conference on "Non-Destructive Investigations and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage"
CY - Lecce, Italy
DA - 2005-05-15
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2005
SP - 7 pages
PB - Italian Society of Non Destructive Testing
CY - Lecce
AN - OPUS4-7677
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Berger, Achim
A1 - Calligaro, T.
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guerra, M.-F.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reiche, I.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
T1 - Study of Ag and Au based historical and archaeological objects by high energy Sy-XRF
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Archaeometry
KW - Gold
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Zeichnungen
KW - Archäometrie
KW - Albrecht Dürer
KW - gold
PY - 2004
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=544
SN - 0179-4159
SP - 544
EP - 546
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-3507
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Bevers, H.
A1 - Dupuis, G.
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
T1 - Spatially resolved SR-XRF analyses of complex drawings by the Holbein family and silverpoint drawings by Rembrandt
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2005
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2004.pdf#page=491
SN - 0179-4159
SP - 491
EP - 493
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-7380
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Armbruster, B.
A1 - Eilbracht, H.
A1 - Grüger, A.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
A1 - Reiche, I.
T1 - The Vikings in Berlin: SR-XRF analyses of the Hiddensee gold jewellery
PY - 2005
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/infos/bessy/highlights2004.pdf#page=32
SN - 1611-6127
SP - 32
EP - 33
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-7386
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Fuentes Rodriguez, A.
A1 - Reiche, I.
A1 - Voigt, F.
A1 - Radtke, Martin
T1 - 3D micro X-ray fluorescence spectroscopy - combining elemental analysis with chemical speciation
PY - 2004
UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/berichte/bessy/annualreport2003.pdf#page=495
SN - 0179-4159
SP - 495
EP - 497
PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung
CY - Berlin
AN - OPUS4-3513
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
T1 - Metallstiftzeichnungen Albrecht Dürers
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Archaeometry
KW - Röntgenfluoreszenzanalyse (RFA)
KW - Zeichnungen
KW - Archäometrie
KW - Albrecht Dürer
PY - 2004
SN - 1563-2628
VL - 5
IS - 2
SP - 30
EP - 38
PB - Foto Text Verl.
CY - Stuttgart
AN - OPUS4-3570
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Denker, A.
A1 - Hahn, Oliver
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Kanngießer, B.
A1 - Malzer, W.
A1 - Röhrs, S.
A1 - Reiche, I.
A1 - Stege, H.
T1 - Röntgenanalytik für Kunstwerke und Kulturgüter
N2 - Naturwissenschaftler arbeiten mit Archäologen, Kunsthistorikern und Restauratoren zusammen, um Materialinformationen über Kunstwerke mit den Erkenntnissen aus Altertumsforschung, Kunstgeschichte und Denkmalpflege zu verbinden. Röntgenfluoreszenz und Röntgenemission sind die Methoden der Wahl, wenn wertvolle und fragile Objekte zerstörungsfrei zu untersuchen sind.
KW - Synchrotron
KW - XRF analysis
KW - Drawings
KW - Paintings
KW - Ink
KW - Art objects
KW - Archaeometry
KW - Röntgenfluoreszenzanalyse (RFA)
KW - Zeichnungen
KW - Gemälde
KW - Tinten
KW - Kunstobjekte
KW - Archäometrie
PY - 2005
SN - 1439-9598
SN - 1521-3854
VL - 53
IS - 2
SP - 118
EP - 123
PB - Wiley-VCH Verl.
CY - Weinheim
AN - OPUS4-6898
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Reiche, I.
A1 - Berger, Achim
A1 - Duval, A.
A1 - Görner, Wolf
A1 - Guicharnaud, H.
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Riederer, J.
A1 - Riesemeier, Heinrich
A1 - Roth, M.
ED - Denker, A.
ED - Adriaens, A.
ED - Dowsett, M.
ED - Giumlia-Mair, A.
T1 - Synchrotron radiation and protons on the traces of famous artists - Non-destructive analyses of silverpoint drawings by Albrecht Dürer
KW - X-ray spectrometry
KW - XRF
KW - Röntgenfluoreszenzanalyse
KW - RFA
KW - Silverpoint drawing
KW - Silberstiftzeichnung
PY - 2006
SN - 3-8167-7178-5
SP - 91
EP - 101
PB - Fraunhofer-IRB-Verl.
CY - Stuttgart
AN - OPUS4-14190
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Wolff, Timo
A1 - Hahn, Oliver
A1 - Merchel, Silke
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Denker, A.
T1 - Four non-destructive X-Ray methods analyzing corroded coins: A self-critical comparison
T2 - Workshop Synchrotron Radiation in Art and Archaeology 2006
CY - Berlin, Germany
DA - 2006-09-27
PY - 2006
AN - OPUS4-14229
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - von Bohlen, A.
A1 - Hergenröder, R.
A1 - Sternemann, C.
A1 - Paulus, M.
A1 - Radtke, Martin
A1 - Riesemeier, Heinrich
T1 - Wavelenght Dispersive Synchrotron Microprobe Used for Material Analysis
N2 - Synchrotron radiation (SR) has been used in recent years as an excellent excitation source for X-ray fluorescence spectrometry. SR offers, in contrast to conventional X-ray sources, highly brilliant polychromatic, polarized radiation with which micro-domain X-ray fluorescence spectrometry becomes possible. A feasibility study of utility, conducted at BESSY (Berlin) and at DELTA (Dortmund), both synchrotron facilities of the third generation, to evaluate the use of wavelength dispersive X-ray fluorescence spectrometry in combination with synchrotron radiation is presented. First results for material analysis, obtained by combining the synchrotron radiation and a commercially available spectrometer commonly attached to a scanning electron microscope, are presented. The spectrometer, of the linear type, uses curved focusing Bragg-crystals of the Johann type which leads to a high spectral resolution up to 3 eV. Examples of micro-domain analyses are presented and compared with those obtained by synchrotron radiation induced energy dispersive X-ray fluorescence.
KW - Synchrotron radiation
KW - WDXRF
KW - EDXRF
KW - Micro analysis
KW - Material analysis
PY - 2005
DO - https://doi.org/10.1081/CI-200048048
SN - 1073-9149
SN - 1525-6030
VL - 33
IS - 2
SP - 137
EP - 150
PB - Dekker
CY - New York, NY
AN - OPUS4-14235
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Reifschneider, O.
A1 - Vennemann, A.
A1 - Buzanich, Günter
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Hogeback, J
A1 - Köppen, C.
A1 - Großgarten, M.
A1 - Sperling, M.
A1 - Wiemann, M.
A1 - Karst, U.
T1 - Revealing Silver Nanoparticle Uptake by Macrophages Using SR-μXRF and LA-ICP-MS
N2 - To better study the impact of nanoparticles on both in vitro and in vivo models, tissue distribution and cellular doses need to be described more closely. Here silver nanoparticles were visualized in alveolar macrophages by means of synchrotron radiation micro X-ray fluorescence spectroscopy (SR-μXRF) with high spatial resolution of 3 × 3 μm2. For the spatial allocation of silver signals to cells and tissue structures, additional elemental labeling was carried out by staining with eosin, which binds to protein and can be detected as bromine signal with SR-μXRF. The method was compatible with immunostaining of macrophage antigens. We found that the silver distribution obtained with SR-μXRF was largely congruent with distribution maps from a subsequent laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of the same tissue sites. The study shows a predominant, though not exclusive uptake of silver into alveolar macrophages in the rat lung, which can be modeled by a similar uptake in cultured alveolar macrophages. Advantages and limitations of the different strategies for measuring nanoparticle uptake at the single cell level are discussed.
KW - Synchrotron
KW - BAMline
KW - XRF
KW - Nanoparticle
KW - Macrophagen
PY - 2020
DO - https://doi.org/10.1021/acs.chemrestox.9b00507
VL - 33
IS - 5
SP - 1250
EP - 1255
PB - American Chemical Society
AN - OPUS4-50855
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Vasilescu, A.
A1 - Constantinescu, B.
A1 - Bugoi, R.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Simon, R.
ED - Denecke, M.
ED - Walker, C.
T1 - Gold provenance studies for Romanian archaeological objects using micro-SR-XRF
N2 - Studies by Synchrotron Radiation-X-Ray Fluorescence (SR-XRF) for the search of the presence of trace elements like Sb, Sn, Te and Pb in archaeological metallic objects found on the territory of Romania-old coins and Bronze Age jewelry, aimed to determine the provenance of the gold used in their manufacture. The results are compared with the detailed elemental composition of alluvial or primary gold samples, obtained by the same technique. This work attempted to establish the origin of the gold used for the mint of two different types of koson coins. We found that the kosons with monogram are made of refined gold, while the one used for the kosons without monogram is mainly alluvial. The gold used in the manufacture of the Calarasi Vulchitrun-type disk and the Tauteu hair ring is also of alluvial origin.
T2 - 20th International congress on X-ray optics and microanalysis
CY - Karlsruhe, Germany
DA - 2009-09-14
KW - Provenance
KW - Gold
KW - SR-XRF
KW - Trace elements
PY - 2010
UR - http://link.aip.org/link/?APCPCS/1221/139/1
SN - 978-0-7354-0764-0
DO - https://doi.org/10.1063/1.3399240
SN - 0094-243X
SP - 139
EP - 143
PB - American Institute of Physics
AN - OPUS4-21182
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
T1 - A study on gold and copper provenance for Romanian prehistoric objects using micro-SR XRF
N2 - This study intends to clarify the metal provenance of gold archaeological items using the variation of the Au–Ag ratio and the presence of trace elements as Sn, Sb, Te, and Pb, concentrating on gold Dacian Koson coins, recovered recently. It also extends the area of our investigations to the copper provenance of Bronze Age artifacts—axes, sickles, and celts—found on Romanian territory. The experiments were performed by micro-SR XRF at BESSY Berlin, at the BAM-line facility. Two types of coins (Koson, with and without monogram) were analysed. The conclusions we reached were that most of the monogram coins are made from refined gold (3–5% Ag, less than 0.5% Cu), while the without monogram coins are made from native Transylvanian gold (9–20% Ag, 0.5–2% Cu), of alluvial origin, proved by the presence of Sn, Sb and Te embedded in the gold. The problem of provenance for prehistoric Romanian copper and bronze objects consists in linking their elemental compositional patterns to the ones of the Bronze Age regional mines from Bulgaria, Serbia or Transylvania, most likely used as ore sources for their manufacture. The studied samples present relevant traces of As, Ag, Sb, and Co, suggesting the most probable use of copper from Serbia or northern Bulgaria for their manufacture.
KW - X-ray fluorescence
KW - Synchrotron radiation
KW - Proton induced X-ray emission
KW - Archaeometry
KW - Gold
PY - 2011
DO - https://doi.org/10.1039/c0ja00215a
SN - 0267-9477
SN - 1364-5544
VL - 26
IS - 5
SP - 917
EP - 921
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-23191
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Brücher, M.
A1 - von Bohlen, A.
A1 - Jacob, P.
A1 - Franzke, J.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Müller, Bernd R.
A1 - Scharf, Oliver
A1 - Hergenröder, R.
T1 - The charge of solid-liquid interfaces measured by X-ray standing waves and streaming current
N2 - Measurements of ion distributions at a charged solid–liquid interface using X-ray standing waves (XSW) are presented. High energy synchrotron radiation (17.48 keV) is used to produce an XSW pattern inside a thin water film on a silicon wafer. The liquid phase is an aqueous solution containing Br and Rb ions. The surface charge is adjusted by titration. Measurements are performed over a pH range from 2.2–9, using the native Si oxide layer and functional (amine) groups as surface charge. The Debye length, indicating the extension of the diffuse layer, could be measured with values varying between 1–4 nm. For functionalized wafers, the pH dependent change from attraction to repulsion of an ion species could be detected, indicating the isoelectric point. In combination with the measurement of the streaming current, the surface charge of the sample could be quantified.
KW - Interfacial charge
KW - Solid/liquid interfaces
KW - Surface analysis
KW - Surface functionalization
KW - X-ray spectrometry
KW - X-ray
KW - Standing waves
KW - XSW
KW - Streaming current
KW - Synchrotron radiation
PY - 2010
DO - https://doi.org/10.1002/cphc.201000166
SN - 1439-4235
SN - 1439-7641
VL - 11
IS - 10
SP - 2118
EP - 2123
PB - Wiley-VCH Verl.
CY - Weinheim
AN - OPUS4-22057
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Stan, D.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Ceccato, D.
A1 - Oberländer-Târnoveanu, E.
T1 - Studies on archaeological gold items found in Romanian territory using X-ray-based analytical spectrometry
N2 - This paper is an overview of the work developed by our group in the investigations of museum objects and alluvial gold, reflected in a series of studies published between 2000–2011, supplemented with new results, unpublished up-to-date. The X-ray based spectrometric techniques employed range from various X-Ray Fluorescence (XRF) investigations to ion beam analysis, including synchrotron radiation XRF and micro-Particle Induced X-ray Emission. The gold objects discussed are mainly part of the Sarmizegetusa Dacian hoards—spiraled bracelets (armbands) and coins. After obtaining in 2011 the permission of the Romanian authorities to take very small (1–2 mg) samples from the most 'unimportant' areas of the Dacian bracelets and several Koson staters, to analyze them by micro-SR-XRF at BESSY, in February 2012, the investigation of several micro-areas of 17 stater and 28 bracelet samples revealed important micro-structural inhomogeneity, especially in Sn and Cu. The same inhomogeneous micro-structure has been seen in Transylvanian alluvial gold. The analyses revealed details on the fingerprint of geological gold deposits and also the main characteristics of ancient gold metallurgy procedures used by the Dacians: a relatively low temperature (lower than Au melting point) and hammering during heating to obtain an ingot through sintering. The use of the sintering procedure was proved for the spiraled bracelets and the Koson without monogram coins, a tradition starting in the Bronze Age in Transylvanian gold processing. The existence of micro-inclusions of Ta-minerals in alluvial gold was also detected, explaining Ta trace presence in the artifacts from the Pietroasa hoard.
KW - Micro-SR-XRF
KW - Micro-PIXE
KW - Archaeometry
KW - Gold
KW - Romania
PY - 2012
DO - https://doi.org/10.1039/c2ja30158j
SN - 0267-9477
SN - 1364-5544
VL - 27
IS - 12
SP - 2076
EP - 2081
PB - Royal Society of Chemistry
CY - London
AN - OPUS4-26991
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Niemeyer, B.
A1 - Schwarzmaier, A.
A1 - Radtke, Martin
A1 - Hahn, Oliver
T1 - Archaische Goldarbeiten aus Kleinasien in der Berliner Antikensammlung – Herstellungstechnik, Materialanalytik und der Fundkomplex »aus Ephesos«
N2 - Ein Konvolut einzelner Schmuckstücke und die Goldbeigaben eines angeblichen Grabfundes wurden technologisch und analytisch untersucht. Die meisten Objekte sind Blecharbeiten, die aus einer Vielzahl von Einzelteilen mit metallischem Goldlot zusammengefügt und mit Granulation oder granulations-imitierendem Perl- oder Kerbdraht verziert wurden. Nur vier kleine Ohrringe sind massiv gegossen.
Zwei Zierbleche dürften über Patrizen (Positivmodeln), die Deckel der Astragale in Matrizen (Negativmodeln) geformt worden sein. Alle Objekte wurden mit Synchrotron- und atmosphärischer Röntgenfluoreszenz analysiert. Die Daten zeigen das breite Spektrum an Goldlegierungen, die im 7./6. Jahrhundert v. Chr. in Kleinasien verarbeitet wurden: vom natürlichen Seifengold (Elektrum) bis zu geläutertem, fast reinem Gold. Eine Korrelation zwischen Goldqualität und Verarbeitungsmethode konnte nicht festgestellt werden. Sowohl hochreines als auch mit viel Silber und Kupfer legiertes Gold wurde zum Schmieden von Blecharbeiten, aber auch zum Massivguss verwendet. Aus der Goldfarbe kann wegen des Phänomens der oberflächlichen Goldanreicherung nicht auf eine Legierungszusammensetzung geschlossen werden. Der 1963 angekaufte Fundkomplex aus lydischen Metallarbeiten und ostionischen Salbgefäßen aus Ton dürfte einen Grabfund des frühen 6. Jahrhunderts v. Chr. darstellen, dessen Herkunft aus Ephesos jedoch nicht zu sichern ist.
KW - Gold
KW - Synchrotron
KW - XRF
PY - 2017
SN - 1866-7007
VL - 9
SP - 57
EP - 83
PB - RGZM. Archäologische Staatssammmlung München
CY - München
AN - OPUS4-42986
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
T1 - Micro-SR-XRF studies for archaeological gold identification - the case of carpathian gold and romanian museal objects
N2 - In the determination of the provenance of gold in archaeological artifacts, trace elements are more significant than the main components. Several minute fragments of natural Carpathian gold-placer and primary-and some very small (a few milligrams) fragments of archaeological items were studied using micro Synchrotron Radiation X-Ray Fluorescence (micro SR-XRF) at the BESSY Synchrotron Facility in Berlin, Germany. The goal of the study was to identify the trace elements characterizing Carpathian gold, looking especially at Sn, Sb, Pb and Te, and to determine if the gold in the archaeological items is native or refined. Applications to the authentication and provenance of nine Dacian gold bracelets, koson coins and two Bronze Age items are presented.
KW - Gold
KW - Provenance
KW - Archeometry
KW - Sy-XRF
PY - 2010
DO - https://doi.org/10.1007/s00339-010-5624-1
SN - 0947-8396
VL - 99
IS - 2
SP - 383
EP - 389
PB - Springer
CY - Berlin
AN - OPUS4-21395
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Constantinescu, B.
A1 - Vasilescu, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Pacheco, C.
A1 - Pichon, L.
A1 - Oberländer-Târnoveanu, E.
T1 - SR XRF and micro-PIXE studies on ancient metallurgy of thirteen Dacian gold bracelets
N2 - A thorough microscopic investigation by SR XRF and micro-PIXE brings insight into the probable techniques used in the manufacture of thirteen Dacian gold bracelets, one of the most spectacular archaeological finds ever on the territory of Romania.
KW - Micro-SR-XRF
KW - Micro-PIXE
KW - Archaeometry
KW - Gold
KW - Romania
PY - 2012
DO - https://doi.org/10.1007/s00339-012-7306-7
SN - 0947-8396
VL - 109
IS - 2
SP - 395
EP - 402
PB - Springer
CY - Berlin
AN - OPUS4-26902
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Babutzka, Martin
A1 - Heyn, A.
T1 - Dynamic tafel factor adaption for the evaluation of instantaneous corrosion rates on zinc by using gel-type electrolytes
N2 - The paper presents a new method for the determination and evaluation of tafel factors using gel-type electrolytes and electrochemical frequency modulation technique (EFM). This relatively new electrochemical method offers the possibility to determine both polarization resistances and tafel factors within one measurement and in short measuring intervals. Starting from a comprehensive parameter study it is shown that a direct relationship between the two values exists that can be described mathematically. This contribution presents the determined tafel factors for the system gel-type electrolyte/zinc and discusses their applicability and their limits.
T2 - 19th Chemnitz Seminar on Materials Engineering – 19. Werkstofftechnisches Kolloquium
CY - Chemnitz, Germany
DA - 16.03.2017
KW - Gel-type electrolytes
KW - Gelartige Elektrolyte
KW - Zinc
KW - Zink
KW - Stern Geary constant
KW - Stern-Geary-Konstante
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-394324
UR - http://iopscience.iop.org/article/10.1088/1757-899X/181/1/012021/pdf
DO - https://doi.org/10.1088/1757-899X/181/1/012021
SN - 1757-899X
SN - 1757-8981
VL - 181
IS - Conference 1
SP - Article UNSP 012021, 1
EP - 11
PB - IOP Publishing
CY - Bristol, UK
AN - OPUS4-39432
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Menzel, M.
A1 - Scharf, O.
A1 - Novak, S.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Hischenhuber, P.
A1 - Buzanich, Günter
A1 - Meyer, A.
A1 - Lopez, V.
A1 - McIntosh, K.
A1 - Streli, C.
A1 - Havrilla, G.
A1 - Fittschen, U.
T1 - Shading in TXRF: calculations and experimental validation using a color X-ray camera
N2 - Absorption effects in total reflection X-ray fluorescence (TXRF) analysis are important to consider, especially if external calibration is to be applied. With a color X-ray camera (CXC), that enables spatially and energy resolved XRF analysis, the absorption of the primary beam was directly visualized for mL-droplets and an array of pL-droplets printed on a Si-wafer with drop-on-demand technology. As expected, deposits that are hit by the primary beam first shade subsequent droplets, leading to a diminished XRF signal. This shading effect was quantified with enhanced precision making use of sub-pixel analysis that improves the spatial resolution of the camera. The measured absorption was compared to simulated results using three different model calculations. It was found they match very well (average deviation < 10%). Thus errors in quantification due to absorption effects can be accounted for in a more accurate manner.
KW - absorption
KW - X-ray Fluorescence analysis
PY - 2015
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-359000
DO - https://doi.org/10.1039/C5JA00127G
IS - 10
SP - 2184
EP - 2193
PB - Royal Society of Chemistry
CY - Cambridge
AN - OPUS4-35900
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Hahn, Oliver
A1 - Denker, A.
A1 - Merchel, S.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Wolff, T.
ED - Armbruster, B.
ED - Eilbracht, H.
ED - Hahn, Oliver
ED - Heinrich-Tamaska, O.
T1 - Zerstörungsfreie Analyse von Metallartefakten - Eine Fallstudie
N2 - Die naturwissenschaftliche Analyse historischer Materialen ermöglicht die Beantwortung kulturhistorischer Fragestellungen, die mit kunsthistorischen oder archäologischen Ansätzen allein nicht zu leisten sind. In dieser Studie wurden sechs römische Münzen mit unterschiedlich stark ausgeprägten Korrosionsschichten an unbehandelten und polierten Stellen mit vier zerstörungsfreien analytischen Methoden untersucht: Hoch- und Niederenergie Protonen Induzierter Röntgenemission (HE-/PIXE), Synchrotronstrahlungsinduzierte-Röntgenfluoreszenzanalyse (SY-RFA) und Mikro-Röntgenfluoreszenzanalyse (Mikro-RFA) mit einem mobilen Gerät. Aufgrund von Unterschieden in den Messbedingungen und dem Einfluss der Patina-Schichten auf diese ergaben sich nur für wenige Elemente Übereinstimmungen in den quantitativen Daten. Zur Validierung zukünftiger Messkampagnen mit verschiedenen Methoden sind daher Vergleichstudien unerlässlich.
N2 - Investigations of physical properties and chemical composition of ancient materials generate important data for answering culture-historical questions that cannot be solved by art historical and archaeological methods alone. This contribution reports on the analysis of six Roman coins, with different degrees of corrosion layers in parts that were not handled or polished, using four non-destructive methods: low-energy particle-induced X-ray emission (PIXE, 2 MeV), high-energy PIXE (68 MeV), μ-X-ray fluorescence (XRF) spectrometry with a portable device and synchrotron-radiation induced XRF. Because of differences in the conditions needed for measurement and the influence of the layers of patina on these measurements, there were few elements where the quantitative data were in agreement. Thus comparative analyses are essential to validate future measurement projects using different methods.
KW - Zerstörungsfreie Prüfung
KW - Protoneninduzierte Röntgenemission
KW - Röntgenfluoreszenzanalyse
KW - Non-destructive testing
KW - Particle-induced X-ray emission
KW - X-ray fluorescence analysis
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-385702
SN - 978-3-9816751-5-3
VL - Berlin studies of the ancient world, Band 35
SP - 117
EP - 137
PB - Edition Topoi
CY - Berlin
AN - OPUS4-38570
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hachmöller, O.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Aichler, M.
A1 - Radtke, Martin
A1 - Dietrich, D.
A1 - Schwamborn, K.
A1 - Lutz, L.
A1 - Werner, M.
A1 - Sperling, M.
A1 - Walch, A.
A1 - Karst, U.
T1 - Elemental bioimaging and speciation analysis for the investigation of Wilsons disease using μXRF and XANES
N2 - A liver biopsy specimen from a Wilson’s disease (WD) patient was analyzed by means of micro-X-ray fluorescence (mXRF) spectroscopy to determine the elemental distribution. First, bench-top mXRF was utilized for a coarse scan of the sample under laboratory conditions. The resulting distribution maps of copper and iron enabled the determination of a region of interest (ROI) for further analysis. In order to obtain more detailed elemental information, this ROI was analyzed by synchrotron radiation (SR)-based mXRF with a beam size of 4 mm offering a resolution at the cellular level. Distribution maps of additional elements to copper and iron like zinc and manganese were obtained due to a higher sensitivity of SR-mXRF. In addition to this, X-ray absorption near edge structure spectroscopy (XANES) was performed to identify the oxidation states of copper in WD. This speciation analysis indicated a mixture of copper(I) and copper(II) within the WD liver tissue.
KW - progressive hepatolenticular degeneration
KW - mXRF Micro-X-ray fluorescence spectroscopy
KW - XANES X-ray absorption near edge structure spectroscopy
PY - 2016
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-360811
DO - https://doi.org/10.1039/C6MT00001K
SN - 1756-5901
SN - 1756-591X
PB - Royal Society of Chemistry
CY - Cambridge
AN - OPUS4-36081
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de O. Primo, J.
A1 - Horsth, D.F.
A1 - de S. Correa, J.
A1 - Das, A.
A1 - Bittencourt, C.
A1 - Umek, P.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Yusenko, Kirill
A1 - Zanetta, C.
A1 - Anaissi, F.J.
T1 - Synthesis and Characterization of Ag/ZnO Nanoparticles for Bacteria Disinfection in Water
N2 - n this study, two green synthesis routes were used for the synthesis of Ag/ZnO nanoparticles, using cassava starch as a simple and low-cost effective fuel and Aloe vera as a reducing and stabilizing agent. The Ag/ZnO nanoparticles were characterized and used for bacterial dis-
infection of lake water contaminated with Escherichia coli (E. coli). Characterization indicated the formation of a face-centered cubic structure of metallic silver nanoparticles with no insertion of Ag into the ZnO hexagonal wurtzite structure. Physicochemical and bacteriological analyses described in “Standard Methods for the Examination of Water and Wastewater” were used to evaluate the efficiency of the treatment. In comparison to pure ZnO, the synthesized Ag/ZnO nanoparticles showed high efficiencies against Escherichia coli (E. coli) and general coliforms present in the lake
water. These pathogens were absent after treatment using Ag/ZnO nanoparticles. The results indicate that Ag/ZnO nanoparticles synthesized via green chemistry are a promising candidate for the treatment of wastewaters contaminated by bacteria, due to their facile preparation, low-cost synthesis,and disinfection efficiency.
KW - Synchrotron
KW - BAMline
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-562440
DO - https://doi.org/10.3390/nano12101764
SN - 2079-4991
VL - 12
IS - 10
SP - 1
EP - 18
PB - MDPI
CY - Basel
AN - OPUS4-56244
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Grengg, C.
A1 - Gluth, Gregor
A1 - Mittermayr, F.
A1 - Ukrainczyk, N.
A1 - Bertmer, M.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Leis, A.
A1 - Dietzel, M.
T1 - Deterioration mechanism of alkali-activated materials in sulfuric acid and the influence of Cu: A micro-to-nano structural, elemental and stable isotopic multi-proxy study
N2 - In this study, a multi-proxy approach combining 29Si, 27Al and 1H MAS-NMR, FEG-EPMA, XANES at the Cu K-edge and XRD analytics with hydrochemical tools such as ICP-OES analyses, oxygen-isotope signatures, and thermodynamic modelling was applied to K-silicate-activated metakaolin specimens - with and without CuSO4·5H2O addition - exposed to sulfuric acid at pH = 2 for 35 days. The results revealed a multistage deterioration mechanism governed by (i) acid diffusion, (ii) leaching of K-A-S-H, (iii) microstructural damage related to precipitation of expansive (K,Ca,Al)-sulfate-hydrate phases (iv) complete dissolution of the K-A-S-H framework, (v) and formation of silica gel in the outermost corroded regions. Copper ions were mainly located in layered spertiniite-chrysocolla-like phases in the as-cured materials. The results demonstrate an overall negative effect of Cu addition on chemical material durability, implying that the reported higher durability of Cu-doped AAM in biocorrosion environments can be best explained by bacteriostatic effects.
KW - Alkali-activated materials
KW - Acid resistance
KW - Microbially induced corrosion
KW - MIC
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-520567
DO - https://doi.org/10.1016/j.cemconres.2021.106373
SN - 0008-8846
VL - 142
SP - 1
EP - 15
PB - Elsevier
CY - Oxford
AN - OPUS4-52056
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Shading Effects in SR-TXRF: Calculations and Experimental Visualization using a Color X-ray Camera
T2 - Denver X-ray Conference
CY - BIG SKY RESORT, BIG SKY, MONTANA, USA
DA - 2014-07-28
PY - 2014
AN - OPUS4-32371
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lutz, C.
A1 - Breuckmann, M.
A1 - Hampel, S.
A1 - Kreyenschmidt, M.
A1 - Ke, X.
A1 - Beuermann, S.
A1 - Schafner, K.
A1 - Turek, T.
A1 - Kunz, U.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Fittschen, U. E. A.
T1 - Characterization of Dimeric Vanadium Uptake and Species in Nafion™ and Novel Membranes from Vanadium Redox Flow Batteries Electrolytes
N2 - A core component of energy storage systems like vanadium redox flow batteries (VRFB) is the polymer electrolyte membrane (PEM). In this work, the frequently used perfluorosulfonic-acid (PFSA) membrane Nafion™ 117 and a novel poly (vinylidene difluoride) (PVDF)-based Membrane are investigated. A well-known problem in VRFBs is the vanadium permeation through the membrane. The consequence of this so-called vanadium crossover is a severe loss of capacity. For a
better understanding of vanadium transport in membranes, the uptake of vanadium ions from electrolytes containing Vdimer(IV–V) and for comparison also V(II), V(III), V(IV), and V(V) by both membranes was studied. UV/VIS spectroscopy, X-ray absorption near edge structure spectroscopy (XANES), total reflection X-ray fluorescence spectroscopy (TXRF), inductively coupled plasma optical emission spectrometry (ICP-OES), and micro X-ray fluorescence spectroscopy (microXRF) were used to determine the vanadium concentrations and the species inside the membrane. The results strongly support that Vdimer(IV–V), a dimer formed from V(IV) and V(V), enters the nanoscopic water-body of Nafion™ 117 as such. This is interesting, because as of now, only the individual ions V(IV) and V(V) were considered to be transported through the membrane. Additionally, it was found that the Vdimer(IV–V) dimer partly dissociates to the individual ions in the novel PVDF-based membrane.
The Vdimer(IV–V) dimer concentration in Nafion™ was determined and compared to those of the other species. After three days of equilibration time, the concentration of the dimer is the lowest compared to the monomeric vanadium species. The concentration of vanadium in terms of the relative uptake λ = n(V)/n(SO3
) are as follows: V(II) [λ = 0.155] > V(III) [λ = 0.137] > V(IV) [λ = 0.124] > V(V) [λ = 0.053] > Vdimer(IV–V) [λ = 0.039]. The results show that the Vdimer(IV–V) dimer Needs to be considered in addition to the other monomeric species to properly describe the transport of vanadium through Nafion™ in VRFBs.
KW - MicroXRF
KW - VRFB
KW - PVDF-based membrane
KW - UV/VIS
KW - XANES
KW - TXRF
KW - ICP-OES
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-530676
DO - https://doi.org/10.3390/membranes11080576
VL - 11
IS - 8
SP - 576
PB - MDPI
AN - OPUS4-53067
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - C. Pardo Pérez, L.
A1 - Arndt, A.
A1 - Stojkovikj, S.
A1 - Y. Ahmet, I.
A1 - T. Arens,, J.
A1 - Dattila, F.
A1 - Wendt, R.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Davies, V.
A1 - Höflich, K.
A1 - Köhnen, E.
A1 - Tockhorn, P.
A1 - Golnak, R.
A1 - Xiao, J.
A1 - Schuck, G.
A1 - Wollgarten, M.
A1 - López, N.
A1 - T. Mayer, M.
T1 - Determining Structure-Activity Relationships in Oxide Derived CuSn Catalysts During CO2 Electroreduction Using X-Ray Spectroscopy
N2 - The development of earth-abundant catalysts for selective electrochemical CO2 conversion is a central challenge. Cu-Sn bimetallic catalysts can yield selective CO2 reduction toward either CO or formate. This study presents oxide-derived Cu-Sn catalysts tunable for either product and seeks to understand the synergetic effects between Cu and Sn causing these selectivity trends. The materials undergo significant transformations under CO2 reduction conditions, and their dynamic bulk and surface structures are revealed by correlating observations from multiple methods—X-ray absorption spectroscopy for in situ study, and quasi in situ X-ray photoelectron spectroscopy for surface sensitivity. For both types of catalysts, Cu transforms to metallic Cu0 under reaction conditions. However, the Sn speciation and content differ significantly between the catalyst types: the CO-selective catalysts exhibit a surface Sn content of 13 at. % predominantly present as oxidized Sn, while the formate-selective catalysts display an Sn content of ≈70 at. % consisting of both metallic Sn0 and Sn oxide species. Density functional theory simulations suggest that Snδ+ sites weaken CO adsorption, thereby enhancing CO selectivity, while Sn0 sites hinder H adsorption and promote formate production. This study reveals the complex dependence of catalyst structure, composition, and speciation with electrochemical bias in bimetallic Cu catalysts.
KW - Electrochemical CO2 conversion
KW - Cu catalysts
KW - X-ray absorption spectroscopy
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-547116
DO - https://doi.org/10.1002/aenm.202103328
SN - 1614-6832
VL - 12
IS - 5
SP - 2103328
PB - Wiley-VCH GmbH
AN - OPUS4-54711
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Radtke, Martin
A1 - Rakotondrajoa, A.
T1 - Machine learning based quantification of synchrotron radiation-induced X-ray fluorescence measurements - a case study
N2 - In this work, we describe the use of artificial neural networks for the quantification of X-ray fluorescence measurements. The training data were generated using Monte Carlo simulation, which avoided the use of adapted reference materials. The extension of the available data set by means of an ANN to generate additional data was demonstrated. Particular emphasis was put on the comparability of simulated and experimental data and how the influence of deviations can be reduced. The search for the optimal hyperparameter, manual and automatic, is also described. For the presented case, we were able to train a network with a mean absolute error of 0.1 weight percent for the synthetic data and 0.7 weight percent for a set of experimental data obtained with certified reference materials.
KW - Machine learning
KW - BAMline
KW - XRF
KW - Synchrotron
KW - Neural network
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-519008
DO - https://doi.org/10.1088/2632-2153/abc9fb
SP - 1
EP - 16
PB - IOP Publishing
AN - OPUS4-51900
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Ha, Q. L. M.
A1 - Armbruster, U.
A1 - Atia, Hanan
A1 - Lund, H.
A1 - Agostini, G.
A1 - Radnik, Jörg
A1 - Vuong, H. T.
A1 - Martin, A.
T1 - Development of active and stable low nickel content catalysts for dry reforming of methane
N2 - Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5wt%) supported on Mg-Al mixed oxide. The aim was to minimize carbon Deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation.
The solids were characterized using N2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al2O3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550–800 °C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 °C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.
KW - Dry reforming of methane
KW - Carbon dioxide
KW - Ni
PY - 2017
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-402904
DO - https://doi.org/10.3390/catal7050157
SN - 2073-4344
VL - 7
IS - 5
SP - 157, 1
EP - 157, 17
PB - MDPI
AN - OPUS4-40290
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Steglich, P.
A1 - Rabus, D. G.
A1 - Sada, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, C.
A1 - Mai, A.
T1 - Silicon Photonic Micro-Ring Resonators for Chemical and Biological Sensing: A Tutorial
N2 - Silicon photonic micro-ring resonators (MRR) developed on the silicon-on-insulator (SOI) platform, owing to their high sensitivity and small footprint, show great potential for many chemical and biological sensing applications such as label-free detection in environmental monitoring, biomedical engineering, and food analysis. In this tutorial,we provide the theoretical background and give design guidelines for SOI-based MRR as well as examples of surface functionalization procedures for label-free detection of molecules. After introducing the advantages and perspectives of MRR, fundamentals of MRR are described in detail, followed by an introduction to the fabrication methods, which are based on a complementary metal-oxide semiconductor (CMOS) technology. Optimization of MRR for chemical and biological sensing is provided, with special emphasis on the optimization of waveguide geometry. At this point, the difference between chemical bulk sensing and label-free surface sensing is explained, and definitions like waveguide sensitivity, ring sensitivity, overall sensitivity as well as the limit of detection (LoD) of MRR are introduced. Further, we show and explain chemical bulk sensing of sodium chloride (NaCl) in water and provide a recipe for label-free surface sensing.
KW - Biosensors
KW - Biophotonics
KW - Chemosensor
KW - Biosensor
KW - Microresonator
KW - Nanophotonics
KW - Optical sensors
KW - Photonic sensors
KW - Optoelectronic
KW - Ring resonator
KW - Silicon photonics
KW - Miniaturization
KW - Lab-on-a-chip
KW - Lab-on-chip
KW - Waveguide
KW - Surface chemistry
KW - Silanization
KW - Glutaraldehyde
KW - Affinity immobilization
KW - Antibody
KW - Oriented immobilization
KW - Real-time measurement
PY - 2022
DO - https://doi.org/10.1109/JSEN.2021.3119547
SN - 1530-437X
VL - 22
IS - 11
SP - 10089
EP - 10105
PB - IEEE
AN - OPUS4-55147
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bornemann-Pfeiffer, Martin
A1 - Wolf, Jakob
A1 - Meyer, Klas
A1 - Kern, S.
A1 - Angelone, D.
A1 - Leonov, A.
A1 - Cronin, L.
A1 - Emmerling, Franziska
T1 - Standardization and control of Grignard reactions in a universal chemical synthesis machine using online NMR
T1 - Standardisierung und Kontrolle von Grignard-Reaktionen mittels Online-NMR in einer universellen chemischen Syntheseplattform
N2 - A big problem with the chemistry literature is that it is not standardized with respect to precise operational parameters, and real time corrections are hard to make without expert knowledge. This lack of context means difficult reproducibility because many steps are ambiguous, and hence depend on tacit knowledge. Here we present the integration of online NMR into an automated chemical synthesis machine (CSM aka. “Chemputer” which is capable of small-molecule synthesis using a universal programming language) to allow automated analysis and adjustment of reactions on the fly. The system was validated and benchmarked by using Grignard reactions which were chosen due to their importance in synthesis. The system was monitored in real time using online-NMR, and spectra were measured continuously during the reactions. This shows that the synthesis being done in the Chemputer can be dynamically controlled in response to feedback optimizing the reaction conditions according to the user requirements.
N2 - Ein Problem der chemischen Literatur ist die fehlende Standardisierung bezüglich genauer Bedingungen, auch Echtzeit-Korrekturen sind ohne Expertenwissen nur schwer möglich. Dieser Mangel an Details erschwert experimentelle Reproduzierbarkeit, da Schritte oft mehrdeutig sind und daher von implizitem Wissen abhängen. Hier präsentieren wir die Integration von Online-NMR Spektroskopie in eine automatisierte chemische Syntheseplattform (CSM aka. “Chemputer”, unter Verwendung einer universellen Programmiersprache zur Synthese kleiner Moleküle fähig), um eine automatisierte Analyse und Anpassung von Reaktionen im laufenden Betrieb zu ermöglichen. Das System wurde anhand von Grignard-Reaktionen, die aufgrund ihrer Bedeutung für die Synthese ausgewählt wurden, validiert und einem Härtetest unterzogen. Synthesen wurden in Echtzeit mit Online-NMR überwacht, und die Spektren wurden während der Reaktionen kontinuierlich aufgenommen und analysiert. Dies zeigt, dass der Chemputer dynamisch mittels einer Regelung kontrolliert werden kann, um die Reaktionsbedingungen entsprechend den Anforderungen des Benutzers zu optimieren.
KW - Grignard reaction
KW - NMR spectroscopy
KW - Process analytical technology
KW - Process control
KW - Grignard-Reaktion
KW - NMR-Spektroskopie
KW - Prozessanalytik
KW - Prozesskontrolle
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-531260
DO - https://doi.org/10.1002/anie.202106323
SN - 1521-3773
SN - 1433-7851
N1 - Bibliografische Angaben für die deutsche Version: Angewandte Chemie 2021, Jg. 133, S. 1–7, ISSN 0044-8249, ISSN 1521-3757, https://doi.org/10.1002/ange.202106323 - Bibliographic information for the German version: Angewandte Chemie 2021, vol. 133, p. 1–7, ISSN 0044-8249, ISSN 1521-3757, https://doi.org/10.1002/ange.202106323
VL - 60
IS - 43
SP - 1
EP - 6
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-53126
LA - mul
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Steglich, P.
A1 - Bondarenko, S.
A1 - Mai, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, A.
T1 - CMOS-Compatible Silicon Photonic Sensor for Refractive Index Sensing Using Local Back-Side Release
N2 - Silicon photonic sensors are promising candidates for lab-on-a-chip solutions with versatile applications and scalable production prospects using complementary metal-oxide semiconductor (CMOS) fabrication methods. However, the widespread use has been hindered because the sensing area adjoins optical and electrical components making packaging and sensor handling challenging. In this work, a local back-side release of the photonic sensor is employed, enabling a separation of the sensing area from the rest of the chip. This approach allows preserving the compatibility of photonic integrated circuits in the front-end of line and metal interconnects in the back-end of line. The sensor is based on a micro-ring resonator and is fabricated on wafer-level using a CMOS technology. We revealed a ring resonator sensitivity for homogeneous sensing of 106 nm/RIU.
KW - Photonic biosensor
KW - Lab-on-a-chip
KW - Ring resonator
KW - Resonance wavelength shift
KW - PIC technology
KW - Back-side integration
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-517139
DO - https://doi.org/10.1109/LPT.2020.3019114
VL - 32
IS - 19
SP - 1241
EP - 1244
PB - IEEE
AN - OPUS4-51713
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Steglich, P.
A1 - Mai, C.
A1 - Bondarenko, S.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Schrader, S.
A1 - Mai, A.
T1 - BioPIC - Integration of Biosensors based on Photonic Integrated Circuits by Local-Backside Etching
N2 - Silicon photonic sensors are promising candidates for lab-on-a-chip solutions with versatile applications and scalable production prospects using complementary metal-oxide semiconductor (CMOS) fabrication methods. However, the widespread use has been hindered because the sensing area adjoins optical and electrical components making packaging and sensor handling challenging. In this work, a local back-side release of the photonic sensor is employed, enabling a separation of the sensing area from the rest of the chip. This approach allows preserving the compatibility of photonic integrated circuits in the front-end of line and metal interconnects in the back-end of line.
T2 - ATTRACT online Conference
CY - Online meeting
DA - 22.09.2020
KW - Silicon Photonics
KW - Photonic Sensor
KW - Photonic Integrated Circuits
KW - Point-Of-Care-Diagnostics
KW - CMOS
KW - Microfluidics
KW - Lab-on-a-chip
KW - Ring resonator
PY - 2020
UR - https://attract-eu.com/showroom/project/integration-of-biosensors-based-on-photonic-integrated-circuits-by-local-backside-etching-biopic/
SP - 1
EP - 5
AN - OPUS4-51735
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Senges, Gene
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Lindič, Tilen
A1 - Gully, Tyler A.
A1 - Winter, Marlon
A1 - Radtke, Martin
A1 - Röder, Bettina
A1 - Steinhauer, Simon
A1 - Paulus, Beate
A1 - Emmerling, Franziska
A1 - Riedel, Sebastian
T1 - Unravelling highly oxidized nickel centers in the anodic black film formed during the Simons process by in situ X-ray absorption near edge structure spectroscopy
N2 - The electrofluorination after Simons has been used for the last century to produce everyday life materials. An in situ XANES investigation of the controversially debated black film apparent in the Simons process revealed high-valent nickel centers.
KW - Synchrotron
KW - BAMline
KW - XANES
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-608366
DO - https://doi.org/10.1039/d3sc06081k
SN - 2041-6520
VL - 15
IS - 12
SP - 4504
EP - 4509
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-60836
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Steglich, P.
A1 - Rabus, D. G.
A1 - Sada, C.
A1 - Paul, Martin
A1 - Weller, Michael G.
A1 - Mai, C.
A1 - Mai, A.
T1 - Silicon Photonic Micro-Ring Resonators for Chemical and Biological Sensing: A Tutorial
N2 - Silicon photonic micro-ring resonators (MRR) developed on the silicon-on-insulator (SOI) platform, owing to their high sensitivity and small footprint, show great potential for many chemical and biological sensing applications such as label-free detection in environmental monitoring, biomedical engineering, and food analysis. In this tutorial, we provide the theoretical background and give design guidelines for SOI-based MRR as well as examples of surface functionalization procedures for label-free detection of molecules.
After introducing the advantages and perspectives of MRR, fundamentals of MRR are described in detail, followed by an introduction to the fabrication methods, which are based on a complementary metal-oxide semiconductor (CMOS) technology. Optimization of MRR for chemical and biological sensing is provided, with special emphasis on the optimization of waveguide geometry. At this point, the difference between chemical bulk sensing and label-free surface sensing is explained, and definitions like waveguide sensitivity, ring sensitivity, overall sensitivity as well as the limit of detection (LoD) of MRR are introduced. Further, we show and explain chemical bulk sensing of sodium chloride (NaCl) in water and provide a recipe for label-free surface sensing.
KW - Lab on a chip
KW - Biosensor
KW - Cmos
KW - Silanization
KW - Surface derivatization
KW - Evanescent wave
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-529360
DO - https://doi.org/10.36227/techrxiv.14909901.v1
SP - 1
EP - 18
PB - IEEE
CY - Piscataway Township
AN - OPUS4-52936
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cakir, Cafer Tufan
A1 - Piotrowiak, T.
A1 - Reinholz, Uwe
A1 - Ludwig, A.
A1 - Emmerling, Franziska
A1 - Streli, C.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
T1 - Exploring the Depths of Corrosion: A Novel GE-XANES Technique for Investigating Compositionally Complex Alloys
N2 - In this study, we propose the use of nondestructive, depth-resolved, element-specific characterization using grazing exit X-ray absorption near-edge structure spectroscopy (GE-XANES) to investigate the corrosion process in compositionally complex alloys (CCAs). By combining grazing exit X-ray fluorescence spectroscopy (GE-XRF) geometry and a pnCCD detector, we provide a scanning-free, nondestructive, depth-resolved analysis in a sub-micrometer depth range, which is especially relevant for layered materials, such as corroded CCAs. Our setup allows for spatial and energy-resolved measurements and directly extracts the desired fluorescence line, free from scattering events and other overlapping lines. We demonstrate the potential of our approach on a compositionally complex CrCoNi alloy and a layered reference sample with known composition and specific layer thickness. Our findings indicate that this new GE-XANES approach has exciting opportunities for studying surface catalysis and corrosion processes in real-world materials.
KW - Degradation mechanisms
KW - Grazin exit XANES
KW - Depth resolved XANES
KW - Compositional complex alloys
KW - Corrosion
PY - 2023
DO - https://doi.org/10.1021/acs.analchem.3c00404
VL - 95
SP - 4810
EP - 4818
PB - ACS Publications
AN - OPUS4-57823
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Polte, Jörg
A1 - Herder, Martin
A1 - Erler, Robert
A1 - Rolf, Simone
A1 - Fischer, A.
A1 - Würth, Christian
A1 - Thünemann, Andreas
A1 - Kraehnert, R.
A1 - Emmerling, Franziska
T1 - Mechanistic insights into seeded growth processes of gold nanoparticles
N2 - A facile approach for the synthesis of monodisperse gold nanoparticles with radii in the range of 7 to 20 nm is presented. Starting from monodisperse seeds with radii of 7 nm, produced in the first step, the addition of a defined amount of additional precursor material permits distinct size regulation and the realization of predicted nanoparticle sizes. These information were derived from ex- and in situ investigations by comprehensive small angle X-ray scattering (SAXS), X-ray absorption near edge structure (XANES) and UV-Vis data to obtain information on the physicochemical mechanisms. The obtained mechanisms can be transferred to other seeded growth processes. Compared to similar approaches, the presented synthesis route circumvents the use of different reducing or stabilizing agents. The size of resulting nanoparticles can be varied over a large size range presented for the first time without a measurable change in the shape, polydispersity or surface chemistry. Thus, the resulting nanoparticles are ideal candidates for size dependence investigations.
KW - Gold nanoparticles
KW - SAXS
KW - XANES
KW - Growth mechanism
PY - 2010
DO - https://doi.org/10.1039/c0nr00541j
SN - 2040-3364
SN - 2040-3372
VL - 2
IS - 11
SP - 2463
EP - 2469
PB - RSC Publ.
CY - Cambridge
AN - OPUS4-22346
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kuhne, Maren
A1 - Dippong, Martin
A1 - Flemig, Sabine
A1 - Hoffmann, Katrin
A1 - Petsch, K.
A1 - Schenk, J.A.
A1 - Kunte, Hans-Jörg
A1 - Schneider, Rudolf
T1 - Comparative characterization of mAb producing hapten-specific hybridoma cells by flow cytometric analysis and ELISA
N2 - A novel method that optimizes the screening for antibody-secreting hapten-specific hybridoma cells by using flow cytometry is described. Cell clones specific for five different haptens were analyzed. We selectively double stained and analyzed fixed hybridoma cells with fluorophore-labeled haptens to demonstrate the target-selectivity, and with a fluorophore-labeled anti-mouse IgG antibody to characterize the level of surface expression of membrane-bound IgGs. ELISA measurements with the supernatants of the individual hybridoma clones revealed that antibodies from those cells, which showed the highest fluorescence intensities in the flow cytometric analysis, also displayed the highest affinities for the target antigens. The fluorescence intensity of antibody-producing cells corresponded well with the produced antibodies' affinities toward their respective antigens. Immunohistochemical staining verified the successful double labeling of the cells. Our method makes it possible to perform a high-throughput screening for hybridoma cells, which have both an adequate IgG production rate and a high target affinity.
KW - Immunization
KW - Hapten
KW - Monoclonal antibodies
KW - Hybridoma
KW - Flow cytometry
KW - ELISA
KW - Estradiol
KW - Estrone
KW - Digoxigenin
KW - Zearalenone
KW - Aflatoxin
KW - CLSM
PY - 2014
DO - https://doi.org/10.1016/j.jim.2014.07.004
SN - 0022-1759
SN - 1872-7905
VL - 413
SP - 45
EP - 56
PB - Elsevier B.V.
CY - Amsterdam
AN - OPUS4-32322
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wiggenhauser, Herbert
A1 - Samokrutov, A
A1 - Mayer, K
A1 - Krause, Martin
A1 - Alekhin, S. G.
A1 - Elkin, V
T1 - Large aperture ultrasonic system for testing thick concrete structures
N2 - A Large Aperture UltraSonic system (LAUS) has been designed and built for testing thick concrete structures. The scalable system consists of twelve ultrasonic units, each hosting 32 individual shear wave transducers with mechanical dry point contact (DPC) to the concrete surface. The twelve units are attached to the concrete surface using a vacuum case which holds them in place during operation. Each LAUS unit can be placed individually on the surface to achieve optimal ultrasonic condition, e.g. to avoid rebars. For the generation of vacuum, air pressure is supplied to each unit through an air hose. The twelve units define an aperture which is necessary for fast reconstruction of the subsurface structure. The well-known SAFT (Synthetic Aperture Focusing Technique) algorithm has been adopted to this situation, where the individual LAUS units form a linear aperture with not necessarily equidistant spacing between the units. The exact geometrical position of the units, which are individually marked with retroreflective labels, is determined using photographs and image processing. All transducers are synchronized and work either as transmitter or receiver. A full scan consists of 12 * 11 recordings, where each unit acts as transmitter once and all others as receivers. An electronic sub-unit on the back of the ultrasonic device holds the battery and handles data acquisition, synchronization and data communication. A computer is used as base unit which communicates with each LAUS unit for control and data acquisition, the synchronization is performed by a radio modem that uses a special algorithm similar to a digital PLL (phase locked loop). No wire connections are necessary between the units and the base system.
The LAUS system is designed to investigate concrete structures with thicknesses in excess of 2 m, depending on the acoustic condition of the object under investigation. Highly reinforced concrete may have less penetration depth. The LAUS provides quasi real time imaging, once the transducers are put in place and the data has been acquired. First measurements on a foundation slab confirm, that the system can register ultrasonic echoes from the back wall at 4 m distance.
KW - Ultrasound "Large Aperture" NDT Concrete
PY - 2017
DO - https://doi.org/10.1061/(ASCE)IS.1943-555X.0000314
SN - 1076-0342
SN - 1943-555X
VL - 23
IS - 1
SP - B4016004-1
EP - B4016004-9
PB - American Society of Civil Engineers (ASCE)
CY - Reston, VA 20191-4400 USA
AN - OPUS4-39372
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Stadthaus, Meinhard
A1 - Thomas, Hans-Martin
A1 - Migoun, N.P.
A1 - Gnusin, A.B.
A1 - Baugatz, J.
A1 - König, W.
T1 - Sensitivity of penetrant and magnetic particle testing - Performance testing of detection media for penetrant and magnetic particle testing (PT and MT)
N2 - Die Empfindlichkeit von Eindring- und Magnetpulverprüfungen (PT, MT) hängt unter anderem von der Eignung und der Qualität der Prüfmittel ab (für PT bezeichnet als Eindringsystem). Die Ermittlung der Empfindlichkeit erfolgt an Kontrollkörpern mit natürlichen und künstlichen Inhomogenitäten durch Ermittlung der Anzeigenerkennbarkeit als Maß für die Eignung. Die europäischen Normen spezifizieren die Anforderungen an die Prüfmittel für Typen-, Chargen- und Betriebsprüfungen nach pr EN ISO 3452-2 für PT und EN ISO 9934-2 für MT. Dieser Beitrag beschreibt die Ermittlung der Empfindlichkeit von Prüfmitteln sowie deren Qualifizierung bei der Typenprüfung. Die vorgeschlagenen Verfahren wurden durch experimentelle Untersuchungen validiert, bei denen ein Bildverarbeitungssystem zur Ermittlung der Anzeigenerkennbarkeit verwendet wurde. Im Hinblick auf die Qualifizierung der Prüfmittel wird die Zuverlässigkeit der Verfahren diskutiert.
PY - 2004
DO - https://doi.org/10.3139/120.100591
SN - 0025-5300
VL - 46
IS - 6
SP - 320
EP - 326
PB - Carl Hanser Verlag
CY - München
AN - OPUS4-3574
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Neumann, Patrick P.
A1 - Kohlhoff, Harald
A1 - Hüllmann, Dino
A1 - Lilienthal, A.J.
A1 - Kluge, Martin
T1 - Bringing Mobile Robot Olfaction to the Next Dimension – UAV-based Remote Sensing of Gas Clouds and Source Localization
N2 - This paper introduces a novel robotic platform for aerial remote gas sensing. Spectroscopic measurement methods for remote sensing of selected gases lend themselves for use on mini-copters, which offer a number of advantages for inspection and surveillance. No direct contact with the target gas is needed and thus the influence of the aerial platform on the measured gas plume can be kept to a minimum. This allows to overcome one of the major issues with gas-sensitive mini-copters. On the other hand, remote gas sensors, most prominently Tunable Diode Laser Absorption Spectroscopy (TDLAS) sensors have been too bulky given the payload and energy restrictions of mini-copters. Here, we introduce and present the Unmanned Aerial Vehicle for Remote Gas Sensing (UAV-REGAS), which combines a novel lightweight TDLAS sensor with a 3-axis aerial stabilization gimbal for aiming on a versatile hexacopter. The proposed system can be deployed in scenarios that cannot be addressed by currently available robots and thus constitutes a significant step forward for the field of Mobile Robot Olfaction (MRO). It enables tomographic reconstruction of gas plumes and a localization of gas sources. We also present first results showing the gas sensing and aiming capabilities under realistic conditions.
T2 - IEEE International Conference on Robotics and Automation (ICRA)
CY - Singapore
DA - 29.05.2017
KW - Tunable Diode Laser Absorption Spectroscopy (TDLAS)
KW - 3-axis gimbal
KW - Mobile Robot Olfaction
KW - Tomographic reconstruction of gas plumes
KW - Localization of gas sources
KW - Aerial platform
PY - 2017
SN - 978-1-5090-4632-4
SP - 3910
EP - 3916
PB - IEEE
AN - OPUS4-40545
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Fittschen, U.E.A.
A1 - Menzel, M.
A1 - Scharf, O.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Buzanich, Günter
A1 - Lopez, V.M.
A1 - McIntosh, K.
A1 - Streli, C.
A1 - Havrilla, G.J.
T1 - Observation of X-ray shadings in synchrotron radiation-total reflection X-ray fluorescence using a color X-ray camera
N2 - Absorption effects and the impact of specimen shape on TXRF analysis has been discussed intensively. Model calculations indicated that ring shaped specimens should give better results in terms of higher counts per mass signals than filled rectangle or circle shaped specimens. One major reason for the difference in signal is shading effects. Full field micro-XRF with a color X-ray camera (CXC) was used to investigate shading, which occurs when working with small angles of excitation as in TXRF. The device allows monitoring the illuminated parts of the sample and the shaded parts at the same time. It is expected that sample material hit first by the primary beam shade material behind it. Using the CXC shading could be directly visualized for the high concentration specimens.
In order to compare the experimental results with calculation of the shading effect the generation of controlled specimens is crucial. This was achieved by 'drop on demand' technology. It allows generating uniform, microscopic deposits of elements. The experimentally measured shadings match well with those expected from calculation.
KW - TXRF
KW - Full field micro-XRF
KW - Color X-ray camera
PY - 2014
DO - https://doi.org/10.1016/j.sab.2014.06.025
SN - 0584-8547
SN - 0038-6987
VL - 99
SP - 179
EP - 184
PB - Elsevier
CY - Amsterdam
AN - OPUS4-31180
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cabral, A.R.
A1 - Radtke, Martin
A1 - Munnik, F.
A1 - Lehmann, B.
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Tupinambá, M.
A1 - Kwitko-Ribeiro, R.
T1 - Iodine in alluvial platinum-palladium nuggets: evidence for biogenic precious-metal fixation
N2 - Synchrotron radiation-induced X-ray fluorescence (SR-XRF) spectrometry was applied to determine iodine concentrations in alluvial Pt–Pd aggregates with delicate morphological features from Córrego Bom Sucesso, Minas Gerais, Brazil. The millimetre-sized botryoidal and rod-shaped grains of alluvial Pt–Pd–Hg intermetallic compounds have surprisingly high concentrations of iodine, in the range from 10 to ~ 120 μg/g. Because iodine is a strongly biophile element, known to be enriched in peatlands and plant remains in soils by microbial activity, its concentration in the Pt–Pd nuggets suggests biogenic precious-metal fixation in the aqueous alluvial milieu. Biogenic and inorganic processes, such as bioreduction and electrochemical metal accretion, could mutually have contributed to the growth of nanoparticles, formed on organic templates, to millimetric Pt–Pd nuggets.
KW - Lodine
KW - Pt-Pd nuggets
KW - Córrego Bom Sucesso
KW - Minas Gerais
KW - Brazil
PY - 2011
DO - https://doi.org/10.1016/j.chemgeo.2010.12.003
SN - 0009-2541
SN - 1872-6836
VL - 281
IS - 1-2
SP - 125
EP - 132
PB - Elsevier B.V.
CY - Amsterdam
AN - OPUS4-23174
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lahiri, D.
A1 - Sharma, S.M.
A1 - Verma, A.K.
A1 - Vishwanadh, B.
A1 - Dey, G.K.
A1 - Schumacher, G.
A1 - Scherb, T.
A1 - Riesemeier, Heinrich
A1 - Reinholz, Uwe
A1 - Radtke, Martin
A1 - Banerjee, S.
T1 - Investigation of short-range structural order in Zr69.5Cu12Ni11Al7.5 and Zr41.5Ti41.5Ni17 glasses, using X-ray absorption spectroscopy and ab initio molecular dynamics simulations
N2 - Short-range order has been investigated in Zr69.5Cu12Ni11Al7.5 and Zr41.5Ti41.5Ni17 metallic glasses using X-ray absorption spectroscopy and ab initio molecular dynamics simulations. While both of these alloys are good glass formers, there is a difference in their glass-forming abilities (Zr41.5Ti41.5Ni17 > Zr69.5Cu12Ni11Al7.5). This difference is explained by inciting the relative importance of strong chemical order, icosahedral content, cluster symmetry and configuration diversity.
KW - Multi-component alloy
KW - Glass-forming ability
KW - XAFS
KW - Local structure
KW - AIMD simulation
PY - 2014
DO - https://doi.org/10.1107/S1600577514017792
SN - 0909-0495
SN - 1600-5775
VL - 21
IS - 6
SP - 1296
EP - 1304
PB - Blackwell Publishing
CY - Oxford
AN - OPUS4-31837
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kulow, Anicó
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Reinholz, Uwe
A1 - Emmerling, Franziska
A1 - Hampel, S.
A1 - Fittschen, U.E.A.
A1 - Streli, C.
A1 - Radtke, Martin
T1 - Comparison of three reconstruction methods based on deconvolution, iterative algorithm and neural network for X-ray fluorescence imaging with coded apertures
N2 - X-ray imaging methods are used in many fields of research, as they allow a non-destructive Investigation of the elemental content of various samples. As for every imaging method, for X-ray imaging the optics are of crucial importance. However, these optics can be very expensive and laborious to build, as the requirements on surface roughness and precision are extremely high. Angles of reflection and refraction are often in the range of a few mrad, making a compact design hard to achieve. In this work we present a possibility to simplify X-ray imaging. We have adapted the coded aperture method, a high energy radiation imaging method that has its origins in astrophysics, to full field X-ray fluorescence imaging. In coded aperture imaging, an object is projected through a known mask, the coded aperture, onto an area sensitive detector. The resulting image consists of overlapping projections of the object and a reconstruction step is necessary to obtain the information from the recorded image. We recorded fluorescence images of different samples with an energy-dispersive 2D detector (pnCCD) and investigated different reconstruction methods. With a small coded aperture with 12 holes we could significantly increase the count rate compared to measurements with a straight polycapillary optic. We show that the reconstruction of two different samples is possible with a deconvolution approach, an iterative algorithm and a neural network. These results demonstrate that X-ray fluorescence imaging with coded apertures has the potential to deliver good results without scanning and with an improved count rate, so that measurement times can be shortened compared to established methods.
KW - X-ray fluorescence imaging
KW - Coded apertures
KW - Imaging
KW - Elemental mapping
KW - Image reconstruction
PY - 2020
DO - https://doi.org/10.1039/d0ja00146e
VL - 35
IS - 7
SP - 1423
EP - 1434
PB - Royal Society of Chemistry
CY - United Kingdom
AN - OPUS4-51518
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -