TY - JOUR A1 - Bär, S. A1 - Huber, G. A1 - Gonzalo, J. A1 - Perea, A. A1 - Munz, Martin T1 - Pulsed laser deposition of EU - Y2O3 thin films on (0001) alpha-Al2O3 JF - Applied physics A N2 - This paper focuses on the preparation and characterization of crystalline thin films of rare-earth-doped sesquioxides (Y2O3, Lu2O3) grown by pulsed laser deposition on single-crystal (0001) sapphire substrates. X-ray diffraction measurements show that the films with thicknesses between 1 nm and 500 nm were highly textured along the 111 direction. Using Rutherford backscattering analysis, the correct stoichiometric composition of the films was established. The emission and excitation spectra of europium-doped films with a thickness 100 nm look similar to those of the corresponding crystalline bulk material, whereas films with a thickness 20 nm show a completely different emission behavior. KW - Pulsed laser deposition KW - Integrated optical devices KW - X-ray diffraction KW - Atomic force microscopy KW - Luminescence PY - 2004 UR - http://www.sciencedirect.com/science/journal/0926860X DO - https://doi.org/10.1007/s00339-004-3029-8 SN - 0947-8396 VL - 80 IS - 2 SP - 209 EP - 216 PB - Springer CY - Berlin AN - OPUS4-5990 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Winkler, T. A1 - Hoenig, E. A1 - Huber, G. A1 - Janssen, R. A1 - Fritsch, D. A1 - Gildenhaar, Renate A1 - Berger, Georg A1 - Morlock, M.M. A1 - Schilling, A.F. T1 - Osteoclastic bioresorption of biomaterials: Two- and three-dimensional imaging and quantification JF - The international journal of artificial organs N2 - Purpose: Bioresorbable materials have been developed in the hope that the body will replace them with newly formed tissue. The first step of this remodeling process in bone is the bioresorption of the material by osteoclasts. The aim of this study was to analyze osteoclastic resorption of biomaterials in vitro using the commonly used two-dimensional methods of light-microscopy (LM) and scanning electron microscopy (SEM) in comparison with infinite focus microscopy (IFM), a recently developed imaging method allowing for three-dimensional surface analysis. Methods: Human hematopoietic stem cells were cultivated in the presence of the cytokines M-CSF and RANK-L for 4 weeks directly on dentin and a calcium phosphate cement. Osteoclast development was surveyed with standard techniques. After removal of the cells, resorption was characterized and quantified by LM, SEM and IFM. Results: Osteoclast cultures on the biomaterials presented the typical osteoclast-specific markers. On dentin samples LM, SEM as well as IFM allowed for discrimination of resorption. Quantification of the resorbed area showed a linear correlation between the results (LM vs. SEM: r=0.996, p=0.004; SEM vs. IFM: r=0.989, p=0.011; IFM vs. LM: r=0.995). It was not possible to demarcate resorption pits on GB14 using LM or SEM. With IFM, resorption on GB14 could be visualized and quantified two- and three-dimensionally. KW - Biomaterial KW - Three-dimensional KW - IFM KW - Osteoclast KW - Dentin KW - Calcium phosphate PY - 2010 SN - 0391-3988 VL - 33 IS - 4 SP - 198 EP - 203 PB - Wichtig Ed. CY - Milano [u.a.] AN - OPUS4-21621 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Sentker, K. A1 - Zantop, A. W. A1 - Lippmann, M. A1 - Hofmann, T. A1 - Seeck, O. H. A1 - Kityk, A. V. A1 - Yildirim, Arda A1 - Schönhals, Andreas A1 - Mazza, M. G. A1 - Huber, P. T1 - Quantized self-assembly of discotic rings in a liquid crystal confined in nanopores JF - Physical Review Letters N2 - Disklike molecules with aromatic cores spontaneously stack up in linear columns with high, onedimensional charge carrier mobilities along the columnar axes, making them prominent model systems for functional, self-organized matter.We show by high-resolution optical birefringence and synchrotron-based x-ray diffraction that confining a thermotropic discotic liquid crystal in cylindrical nanopores induces a quantized formation of annular layers consisting of concentric circular bent columns, unknown in the bulk state. Starting from the walls this ring self-assembly propagates layer by layer towards the pore center in the supercooled domain of the bulk isotropic-columnar transition and thus allows one to switch on and off reversibly single, nanosized rings through small temperature variations. By establishing a Gibbs free energy phase diagram we trace the phase transition quantization to the discreteness of the layers’ excess bend deformation energies in comparison to the thermal energy, even for this near room-temperature system. Monte Carlo simulations yielding spatially resolved nematic order parameters, density maps, and bondorientational order parameters corroborate the universality and robustness of the confinement-induced columnar ring formation as well as its quantized nature. KW - Discotic liquid crystals KW - Nanopores PY - 2018 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-440253 DO - https://doi.org/10.1103/PhysRevLett.120.067801 SN - ‎0031-9007 SN - 1079-7114 VL - 120 IS - 6 SP - 067801-1 EP - 067801-7 PB - American Physical Society AN - OPUS4-44025 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Sentker, K. A1 - Yildirim, Arda A1 - Lippmann, M. A1 - Zantop, A. W. A1 - Bertram, F. A1 - Hofmann, T. A1 - Seeck, O. H. A1 - Kityk, A. A1 - Mazza, M. G. A1 - Schönhals, Andreas A1 - Huber, P. T1 - Self-assembly of liquid crystals in nanoporous solids for adaptive photonic metamaterials JF - Nanoscale N2 - Nanoporous media exhibit structures significantly smaller than the wavelengths of visible light and can thus act as photonic metamaterials. Their optical functionality is not determined by the properties of the base materials, but rather by tailored, multiscale structures, in terms of precise pore shape, geometry, and orientation. Embedding liquid crystals in pore space provides additional opportunities to control light–matter interactions at the single-pore, meta-atomic scale. Here, we present temperature-dependent 3D reciprocal space mapping using synchrotron-based X-ray diffraction in combination with high-Resolution birefringence experiments on disk-like mesogens (HAT6) imbibed in self-ordered arrays of parallel cylindrical pores 17 to 160 nm across in monolithic anodic aluminium oxide (AAO). In agreement with Monte Carlo computer simulations we observe a remarkably rich self-assembly behaviour, unknown from the bulk state. It encompasses transitions between the isotropic liquid state and discotic stacking in linear columns as well as circular concentric ring formation perpendicular and parallel to the pore axis. These textural transitions underpin an optical birefringence functionality, tuneable in magnitude and in sign from positive to negative via pore size, pore surface-grafting and temperature. Our study demonstrates that the advent of large-scale, self-organised nanoporosity in monolithic solids along with confinement-controllable phase behaviour of liquid-crystalline matter at the single-pore scale provides a reliable and accessible tool to design materials with adjustable optical anisotropy, and thus offers versatile pathways to finetune polarisation-dependent light propagation speeds in materials. Such a tailorability is at the core of the emerging field of transformative optics, allowing, e.g., adjustable light absorbers and extremely thin metalenses. KW - Discotic Liquid Crystals PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-499601 DO - https://doi.org/10.1039/c9nr07143a SP - 1 EP - 14 PB - RSC Royal Society of Chemistry AN - OPUS4-49960 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Waiblinger, H. U. A1 - Bartsch, D. A1 - Brockmeyer, J. A1 - Bruenen-Nieweler, C. A1 - Busch, U. A1 - Haase, I. A1 - Hahn, A. A1 - Haarmann, M. A1 - Hauser, W. A1 - Huber, I. A1 - Jany, K. D. A1 - Kirmse, N. A1 - Lindeke, S. A1 - Neumann, K. A1 - Naumann, H. A1 - Paschke, A. A1 - Pietsch, K. A1 - Pöpping, B. A1 - Reiting, R. A1 - Schroeder, U. A1 - Schwägele, F. A1 - Weller, Michael G. A1 - Zagon, J. T1 - Methods of differentiating animal species in food - Status quo JF - Fleischwirtschaft China N2 - In the field of animal species differentiation, work on standardizing methods has been intensified in Germany in recent years, not least due to the horsemeat scandal in 2013. Even though there are now hardly ever any positive findings anymore in examinations to detect horse adulterations in foods such as lasagne, animal species differentiation altogether ranks high in detecting adulteration of foods. This article, therefore, summarises the current status of analytical techniques used in Germany with standardization at German level. It has been established by the working group "Biochemical and Molecular Biological Analytics" of the Lebensmittelchemische Gesellschaft (Food Chemistry Society within the German Chemical Society) with support of experts in the working group “Molecular biology techniques for differentiating plant and animal species" (§64 of the German Food and Feed Code - LFGB) and the "Immunology and molecular biology" task force of the food hygiene and food of animal origin working group (ALTS), both from Germany. KW - Animal species differentiation KW - Fish species KW - PCR KW - ELISA KW - LC-MS/MS PY - 2017 IS - 3 SP - 29 EP - 36 PB - Deutscher Fachverlag GmbH CY - Frankfurt am Main AN - OPUS4-43485 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Waiblinger, H. U. A1 - Brockmeyer, J. A1 - Bruenen-Nieweler, C. A1 - Busch, U. A1 - Haase, I. A1 - Hahn, A. A1 - Haarmann, M. A1 - Hauser, W. A1 - Huber, I. A1 - Jany, K. D. A1 - Kirmse, N. A1 - Lindeke, S. A1 - Neumann, K. A1 - Naumann, H. A1 - Paschke, A. A1 - Pietsch, K. A1 - Pöpping, B. A1 - Reiting, R. A1 - Schroeder, U. A1 - Schwägele, F. A1 - Weller, Michael G. A1 - Zagon, J. T1 - Methoden zur Differenzierung von Tierarten in Lebensmitteln – Status quo JF - Fleischwirtschaft N2 - Nicht zuletzt bedingt durch den Pferdefleischskandal im Jahr 2013 wurden in Deutschland die Aktivitäten bei der Methodenstandardisierung im Bereich der Tierarten-Differenzierung in den vergangenen Jahren intensiviert. Wenn auch positive Befunde bei dem Nachweis von Bestandteilen aus Pferd in Lebensmitteln wie Lasagne derzeit so gut wie nicht mehr anzutreffen sind, so hat die Tierartendifferenzierung insgesamt beim Nachweis von Verfälschungen in Lebensmitteln einen hohen Stellenwert. Diese Arbeit fasst daher den aktuellen Stand der Analytik in Deutschland mit Schwerpunkt bei der Standardisierung zusammen. Sie wurde erstellt durch die Arbeitsgruppe „Biochemische und molekularbiologische Analytik“ der Lebensmittelchemischen Gesellschaft mit Unterstützung von Experten der Arbeitsgruppe „Molekularbiologische Methoden zur Pflanzen- und Tierartendifferenzierung“ (§ 64 LFGB) sowie der ALTS-Arbeitsgruppe „Immunologie und Molekularbiologie“ (jeweils D). KW - ELISA KW - PCR KW - Multiplex KW - DNA-Chip KW - Fischarten KW - Standardisierung KW - Molekularbiologie KW - Immunoassay KW - Hybridisierung KW - Digitale PCR KW - LC-MS/MS KW - Massenspektrometrie KW - Schnellmethoden KW - Screening KW - Milch KW - Microarray KW - LAMP KW - Laborvergleichuntersuchungen KW - Referenzmaterialien KW - Standardverfahren PY - 2017 SN - 0015-363X IS - 1 SP - 97 EP - 102 PB - Deutscher Fachverlag GmbH CY - Frankfurt AN - OPUS4-39038 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Waiblinger, H. U. A1 - Bartsch, D. A1 - Brockmeyer, J. A1 - Bruenen-Nieweler, C. A1 - Busch, U. A1 - Haase, I. A1 - Hahn, A. A1 - Haarmann, M. A1 - Hauser, W. A1 - Huber, I. A1 - Jany, K. D. A1 - Kirmse, N. A1 - Lindeke, S. A1 - Neumann, K. A1 - Naumann, H. A1 - Paschke, A. A1 - Pietsch, K. A1 - Pöpping, B. A1 - Reiting, R. A1 - Schroeder, U. A1 - Schwägele, F. A1 - Weller, Michael G. A1 - Zagon, J. T1 - Methods of differentiating animal species in foods – Status quo JF - Fleischwirtschaft international N2 - Work on standardising methods in the field of animal species differentiation has been intensified in Germany in recent years, not least due to the horsemeat scandal in 2013. Even though there are now hardly ever any positive findings any more in examinations to detect horse adulterations in foods such as lasagne, animal species differentiation altogether ranks high in detecting adulteration of foods. This article therefore summarises the current status of analytical techniques used in Germany with standardisation at German level. It has been established by the working group “Biochemical and Molecular Biological Analytics” of the Lebensmittelchemische Gesellschaft (Food Chemistry Society within the German Chemical Society) with support of experts in the working group “Molecular biology techniques for differentiating plant and animal species” (§ 64 of the German Food and Feed Code – LFGB) and the “Immunology and molecular biology” task force of the food hygiene and Food of animal origin working group (ALTS), both from Germany. KW - Animal species differentiation KW - Fish species KW - PCR KW - Standardisation KW - DNA chip KW - Multiplex methods KW - Digital PCR KW - ELISA methods KW - Immunoassays KW - LC-MS/MS KW - Reference materials KW - Microarrays KW - LAMP KW - Interlaboratory studies PY - 2017 SN - 0179-2415 VL - 97 IS - 1 SP - 50 EP - 55 PB - Deutscher Fachverlag GmbH CY - Frankfurt AN - OPUS4-39264 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eschlböck-Fuchs, S. A1 - Huber, N. A1 - Ahamer, C. M. A1 - Hechenberger, J. G. A1 - Kolmhofer, P. J. A1 - Heitz, J. A1 - Rössler, R. A1 - Demidov, Alexander A1 - Schmid, Thomas A1 - Gornushkin, Igor B. A1 - Panne, Ulrich A1 - Pedarnig, J. D. T1 - Application of laser-induced breakdown spectroscopy for the analysis of slags in industrial steel production T2 - Tagungsband – 11. Kolloquium Prozessanalytik N2 - Laser-induced breakdown spectroscopy (LIBS) is a fast and versatile technique for (semi) quantitative element analysis of solids, liquids, gases, and particulate matter. The LIBS method is used for optical sensing in various branches of industrial production. In the contribution we review some of our recent results on LIBS analysis of slags from secondary metallurgy in industrial steel making. Major oxides in steel slags are measured at-line and after homogenization using a calibration-free (CF) method. Two approaches for CF analysis based on the Boltzmann plot method and on the calculation of synthetic spectra are compared for the analysis of quaternary oxides. We also present the research in cooperation with our industrial partners in the process-analytical chemistry network PAC. T2 - 11. Kolloquium Arbeitskreis Prozessanalytik CY - Vienna, Austria DA - 30.11.2015 KW - Laser-induced breakdown spectroscopy (LIBS) KW - Process analytical technology KW - Steel slag PY - 2015 PB - Plandruck+ Gesellschaft m.b.H. CY - Wien AN - OPUS4-39005 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -