TY - CONF A1 - Peplinski, Burkhard A1 - Wenzel, J. A1 - Schultze, Dietrich T1 - Certification of the phase composition of a BAM reference material by an interlaboratory comparison applying X-ray and neutron diffraction T2 - Symposium "Reference Materials for Technologies in the New Millenium" CY - Berlin, BAM, Germany DA - 2000-05-22 PY - 2000 SP - 1(?) EP - 13(?) AN - OPUS4-12600 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Witke, Klaus A1 - Götze, J. A1 - Rößler, R. A1 - Dietrich, D. A1 - Marx, G. T1 - Raman and cathodoluminescence spectroscopic investigations on Permian fossil wood from Chemnitz - a contribution to the study of the permineralisation process N2 - Samples of different three-dimensionally preserved fossil plants (Medullosa sp., Dadoxylon sp., Calamodendron striatum, Psaronius sp.) from the Lower Permian petrified forest of Chemnitz were examined with regard to their chemical composition and structural order. Raman spectroscopy and cathodoluminescence microscopy are shown to be powerful tools for such investigations. Silicified wood from Chemnitz–Hilbersdorf generally shows yellow cathodoluminescence (CL) of the cell walls and only weak yellow-brownish CL of the cell lumina. By time-resolved cathodoluminescence spectroscopy, a secondary mineralisation of hydrothermal origin was recognized. The latter is shown by short-lived blue CL at the cell walls extinguishing the yellow signal. Therefore, after the primary silicification step a secondary mineralisation step initiated by hydrothermal processes, seems to have taken place at probably slightly higher temperatures. The resulting silica matrix consists of phanerocrystalline and microcrystalline a-quartz as well as microcrystalline moganite, both partially associated with iron oxides. Dadoxylon sp. is a prominent example for parallel permineralisation by a-quartz and fluorspar, which is outstanding for the Chemnitz Petrified Forest. CL on this samples shows parallel silicification and fluoritisation, followed by infiltration of iron oxides. Permineralised samples show very low percentage of original organic remains. The seed fern Medullosa, for example, shows dispersed carbon, which is mainly restricted to the centres of the typical star-shaped vascular bundles. Raman spectroscopy revealed that these carbonaceous particles are of an anthracite structure. For experimental confirmation coal samples of different rank, especially anthracite from different geological times and localities, were studied by means of Raman spectroscopy. The remaining pith of the vascular bundles is white-coloured and consists of a-quartz and moganite, whereas surrounding tracheides exhibit white and reddish coloured parts. The reddish parts, mainly found in the rays, additionally contain a-Fe2O3 and Fe3O4 among the SiO2 polymorphs of a-quartz and moganite. Sometimes iron oxides could have dominated permineralisation processes as the peak intensities of distinct parts of the samples suggest. KW - Raman spectroscopy KW - Cathodoluminescence microscopy KW - Petrified wood KW - Permineralisation KW - Anthracite PY - 2004 UR - http://www.sciencedirect.com/science?_ob=PublicationURL&_cdi=5287&_pubType=J&_auth=y&_acct=C000049503&_version=1&_urlVersion=0&_userid=963821&md5=ebfde1a480f4ae6a3eb0052a1b8e7c2a&jchunk=60#60 DO - https://doi.org/10.1016/j.saa.2003.12.045 SN - 0584-8547 SN - 0038-6987 VL - 60 IS - 12 SP - 2903 EP - 2912 PB - Elsevier CY - Amsterdam AN - OPUS4-4122 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, J. A1 - Wünsche von Leupoldt, A. A1 - Grabolle, Markus A1 - Resch-Genger, Ute A1 - Heinze, K. T1 - Thermal and photoinduced electron transfer in directional bis(terpyridine)ruthenium(II)-(bipyridine)-platinum(II) complexes N2 - Metalloligands L1 and L2 consisting of directional bis(terpyridine)ruthenium(II) units and bipyridine moieties were constructed by amide formation. From these metalloligands two Ru–Pt heterobimetallic complexes 1 and 2 were derived by a building-block method by means of platination with [PtCl2(dmso)2]. Both bimetallic complexes 1 and 2 feature metal-to-ligand charge transfer (MLCT) absorptions, and emission occurs at room temperature in fluid solution from ³MLCT(Ru) states in all cases. Energy transfer from platinum to ruthenium is observed in 2 but not in 1 (light harvesting). The one-electron-reduced species [1]– and [2]– were prepared by reduction of 1 and 2 with decamethylcobaltocene. EPR spectra and DFT calculations reveal that the spin density is localized at the tpy–CO/Ru (tpy = terpyridine) site in [1]–, whereas it is centered at bpy–CO/Pt (bpy = 2,2'-bipyridine) in [2]–. Efficient photoinduced electron transfer from triethanolamine to 1 and 2 is feasible by excitation at 500 nm [MLCT(Ru)]. KW - Electron transfer KW - Luminescence KW - Platinum KW - Ruthenium KW - N ligands PY - 2013 DO - https://doi.org/10.1002/ejic.201201531 SN - 1434-1948 SN - 1099-0682 VL - 2013 IS - 17 SP - 3009 EP - 3019 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-29301 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Heinrich, Thomas A1 - Traulsen, Christoph Hans-Henning A1 - Darlatt, Erik A1 - Richter, S. A1 - Poppenberg, J. A1 - Traulsen, N.L. A1 - Linder, I. A1 - Lippitz, Andreas A1 - Dietrich, Paul A1 - Dib, B. A1 - Unger, Wolfgang A1 - Schalley, C.A. T1 - The versatility of 'Click' reactions at surfaces: Molecular recognition at interfaces N2 - In order to investigate molecular recognition on surfaces, an azide-functionalized monolayer was deposited on gold. The monolayer was characterized by X-ray photoelectron spectroscopy (XPS) and angle-resolved near-edge X-ray absorption fine structure (NEXAFS) experiments and the decomposition of the azide upon irradiation with X-ray beams was investigated. Subsequently, various alkyne-functionalized host and guest molecules were attached to the azide by 1,3-dipolar cycloaddition. These modified surfaces and their host–guest chemistry were analysed by XPS and angle-resolved NEXAFS. The reversibility of guest binding was shown for one example as a proof of principle. KW - 'Click' reaction KW - Azide-terminated surfaces KW - SAMs KW - Host guest molecules KW - Molecular recognition at interfaces PY - 2014 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-306463 DO - https://doi.org/10.1039/C4RA01730G SN - 2046-2069 VL - 4 IS - 34 SP - 17694 EP - 17702 PB - RSC Publishing CY - London AN - OPUS4-30646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lohrer, Christian A1 - Eckhardt, Dietrich A1 - Blum, J. T1 - Normenreihe DIN EN 15947 über Feuerwerkskörper N2 - Der vorliegende Bericht gibt einen Überblick über die neue Normenreihe DIN EN 15947 über „Pyrotechnische Gegenstände - Feuerwerkskörper, Kategorien 1, 2 und 3". Es werden der Anwendungsbereich aufgezeigt und wesentliche Änderungen im Vergleich zu der zurückgezogenen und ersetzten Normenreihe DIN EN 14035 über „Feuerwerkskörper" vorgestellt. Die Normenreihe DIN EN 15947 besteht aus den fünf Teilen „Begriffe", „Kategorien und Feuerwerkstypen", „Mindestanforderungen an die Kennzeichnung", „Prüfverfahren" und „Anforderungen an Konstruktion und Funktion" und wurde im Dezember 2010 veröffentlicht. KW - Pyrotechnische Gegenstände KW - Kategorien KW - Prüfverfahren KW - DIN EN 14035 PY - 2011 SN - 0722-2912 SN - 0011-4952 VL - 7 SP - 21 EP - 26 PB - Beuth CY - Berlin AN - OPUS4-23992 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lohrer, Christian A1 - Eckhardt, Dietrich A1 - Blum, J. T1 - Normenreihen DIN EN 16261 für Großfeuerwerk und DIN EN 16256 für Bühnenpyrotechnik N2 - Der vorliegende Bericht gibt einen Überblick über die Normenreihen DIN EN 16261 'Pyrotechnische Gegenstände - Feuerwerkskörper, Kategorie 4' und DIN EN 16256 'Pyrotechnische Gegenstände - Pyrotechnische Gegenstände für Bühne und Theater'. Neben der Vorstellung der jeweiligen Anwendungsbereiche werden die wesentlichen Anforderungen an Konstruktion, Funktion und Kennzeichnung aufgezeigt. Des Weiteren werden die Prüf- und Bewertungsmethoden dieser pyrotechnischen Gegenstände dargestellt und miteinander verglichen. Die Normenreihe DIN EN 16261 besteht aus 4 Teilen 'Begriffe', 'Anforderungen', 'Prüfverfahren' und 'Mindestanforderungen an die Kennzeichnung und Gebrauchsanweisung'. Die Normenreihe DIN EN 16256 ist strukturell vergleichbar aufgebaut enthält aber im Vergleich zur Normenreihe DIN EN 16261 einen weiteren Teil zur Unterscheidung der Kategorien T1 und T2. KW - Pyrotechnische Gegenstände KW - Prüfung KW - Bewertung PY - 2015 SN - 0011-4952 IS - März SP - 17 EP - 25 PB - Beuth-Vertrieb CY - Berlin AN - OPUS4-32796 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Dietrich, P. A1 - Beblo-Vranesevic, K. A1 - Kjærvik, Marit A1 - Unger, Wolfgang A1 - Schwibbert, Karin A1 - Hardie, K. A1 - Brown, J. T1 - XPS surface analysis of bacterial samples N2 - This application note presents how EnviroESCA can be used to analyze bacterial samples under near ambient pressure conditions in various states of hydration using different levels of humidity. Such investigations of bacterial cell wall surfaces in their hydrated state are essential for studying biological interfaces at work. The use of innovative near-ambient pressure (NAP-)XPS instrumentation allows the detailed analysis of irregularly-surfaced biofilms. NAP-XPS enables the surface analysis of bacterial samples in their natural hydrated state without complex sample preparation techniques such as freeze-drying or fast-freezing, which are needed for XPS analysis in ultrahigh vacuum. KW - Near ambient pressure XPS KW - Biofilms PY - 2018 UR - http://www.enviroai.com/uploads/1/0/2/8/102861712/xps_surface_analysis_of_bacillus_subtilis_biofilms_final.pdf IS - Application Note #000399 SP - 1 EP - 5 CY - Berlin AN - OPUS4-44588 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Stösser, R. A1 - Scholz, G. A1 - Buzaré, J.-Y. A1 - Silly, G. A1 - Nofz, Marianne A1 - Schultze, Dietrich T1 - A magnetic resonance investigation of the process of corundum formation starting from sol-gel precursors PY - 2005 SN - 0002-7820 SN - 1551-2916 VL - 88 IS - 10 SP - 2913 EP - 2922 PB - Blackwell Publishing CY - Malden AN - OPUS4-11888 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nolze, Gert A1 - Dietrich, D. A1 - Lampke, T. A1 - Del-Solar-Velarde, N. A1 - Nickel, D. A1 - Chapoulie, R. A1 - Castillo Butters, L.J. T1 - The potential of EBSD and EDS for ceramics investigations - Case studies on sherds of pre-Columbian pottery N2 - The work focuses on the potential of structural and chemical examinations by scanning electron microscopy based methods for archaeometric studies on ceramics. Achieved by a single preparation technique (polished block sections), the feasibility and benefits of electron backscatter diffraction are demonstrated as case studies using polychrome examples of pre-Columbian pottery (Wari, Moche and Cajamarca). Elemental and phase maps allow for separate consideration of clay and temper. Identification of mineral phases and intergrowths of temper particles provide information for clarifying clay procurement and firing techniques with respect to local versus non-local pottery to enlighten trade relations, technological transfer and shared heritage of pre-Columbian cultures. KW - SEM–EDS/EBSD KW - Pre-Columbian ceramics KW - Temper KW - Pseudobrookite KW - Titanite PY - 2017 VL - 60 IS - 3 SP - 489 EP - 501 AN - OPUS4-45096 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -