Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-36432 Wissenschaftlicher Artikel Gruber, W.; Chakravarty, S.; Baehtz, C.; Leitenberger, Wolfram; Bruns, M.; Kobler, A.; Kübel, Christian; Schmidt, H. Strain relaxation and vacancy creation in thin platinum films Synchrotron based combined in situ x-ray diffractometry and reflectometry is used to investigate the role of vacancies for the relaxation of residual stress in thin metallic Pt films. From the experimentally determined relative changes of the lattice parameter a and of the film thickness L the modification of vacancy concentration and residual strain was derived as a function of annealing time at 130 degrees C. The results indicate that relaxation of strain resulting from compressive stress is accompanied by the creation of vacancies at the free film surface. This proves experimentally the postulated dominant role of vacancies for stress relaxation in thin metal films close to room temperature. College Park American Physical Society 2011 5 Physical review letters 107 26 10.1103/PhysRevLett.107.265501 Institut für Physik und Astronomie OPUS4-42349 misc Krüger, Stefanie; Schwarze, Michael; Baumann, Otto; Günter, Christina; Bruns, Michael; Kübel, Christian; Szabó, Dorothée Vinga; Meinusch, Rafael; de Zea Bermudez, Verónica; Taubert, Andreas Bombyx mori silk/titania/gold hybrid materials for photocatalytic water splitting The synthesis, structure, and photocatalytic water splitting performance of two new titania (TiO 2 )/gold(Au)/Bombyx mori silk hybrid materials are reported. All materials are monoliths with diameters of up to ca. 4.5 cm. The materials are macroscopically homogeneous and porous with surface areas between 170 and 210 m 2/g. The diameter of the TiO 2 nanoparticles (NPs) - mainly anatase with a minor fraction of brookite - and the Au NPs are on the order of 5 and 7-18 nm, respectively. Addition of poly(ethylene oxide) to the reaction mixture enables pore size tuning, thus providing access to different materials with different photocatalytic activities. Water splitting experiments using a sunlight simulator and a Xe lamp show that the new hybrid materials are effective water splitting catalysts and produce up to 30 mmol of hydrogen per 24 h. Overall the article demonstrates that the combination of a renewable and robust scaffold such as B. mori silk with a photoactive material provides a promising approach to new monolithic photocatalysts that can easily be recycled and show great potential for application in lightweight devices for green fuel production. 2018 18 Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe 581 urn:nbn:de:kobv:517-opus4-423499 10.25932/publishup-42349 Mathematisch-Naturwissenschaftliche Fakultät OPUS4-34266 Wissenschaftlicher Artikel Junginger, Mathias; Kübel, Christian; Schacher, Felix H.; Müller, Axel H. E.; Taubert, Andreas Crystal structure and chemical composition of biomimetric calcium phosphate nanofibers Calcium phosphate nanofibers with a diameter of only a few nanometers and a cotton-ball-like aggregate morphology have been reported several times in the literature. Although fiber formation seems reproducible in a variety of conditions, the crystal structure and chemical composition of the fibers have been elusive. Using scanning transmission electron microscopy, low dose electron (nano)diffraction, energy-dispersive X-ray spectroscopy, and energy- filtered transmission electron microscopy, we have assigned crystal structures and chemical compositions to the fibers. Moreover, we demonstrate that the mineralization process yields true polymer/calcium phosphate hybrid materials where the block copolymer template is closely associated with the calcium phosphate. 2013 10.1039/c3ra23348k Institut für Chemie OPUS4-35348 Wissenschaftlicher Artikel Junginger, Mathias; Kübel, Christian; Schacher, Felix H.; Müller, Axel H. E.; Taubert, Andreas Crystal structure and chemical composition of biomimetic calcium phosphate nanofibers Calcium phosphate nanofibers with a diameter of only a few nanometers and a cotton-ball-like aggregate morphology have been reported several times in the literature. Although fiber formation seems reproducible in a variety of conditions, the crystal structure and chemical composition of the fibers have been elusive. Using scanning transmission electron microscopy, low dose electron (nano) diffraction, energy-dispersive X-ray spectroscopy, and energy-filtered transmission electron microscopy, we have assigned crystal structures and chemical compositions to the fibers. Moreover, we demonstrate that the mineralization process yields true polymer/calcium phosphate hybrid materials where the block copolymer template is closely associated with the calcium phosphate. Cambridge Royal Society of Chemistry 2013 8 RSC Advances 3 28 11301 11308 10.1039/c3ra23348k Institut für Chemie OPUS4-53902 Wissenschaftlicher Artikel Krüger, Stefanie; Schwarze, Michael; Baumann, Otto; Günter, Christina; Bruns, Michael; Kübel, Christian; Szabo, Dorothee Vinga; Meinusch, Rafael; Bermudez, Veronica de Zea; Taubert, Andreas Bombyx mori silk/titania/gold hybrid materials for photocatalytic water splitting The synthesis, structure, and photocatalytic water splitting performance of two new titania (TiO2)/gold(Au)/Bombyx mori silk hybrid materials are reported. All materials are monoliths with diameters of up to ca. 4.5 cm. The materials are macroscopically homogeneous and porous with surface areas between 170 and 210 m(2)/g. The diameter of the TiO2 nanoparticles (NPs) - mainly anatase with a minor fraction of brookite - and the Au NPs are on the order of 5 and 7-18 nm, respectively. Addition of poly(ethylene oxide) to the reaction mixture enables pore size tuning, thus providing access to different materials with different photocatalytic activities. Water splitting experiments using a sunlight simulator and a Xe lamp show that the new hybrid materials are effective water splitting catalysts and produce up to 30 mmol of hydrogen per 24 h. Overall the article demonstrates that the combination of a renewable and robust scaffold such as B. mori silk with a photoactive material provides a promising approach to new monolithic photocatalysts that can easily be recycled and show great potential for application in lightweight devices for green fuel production. Frankfurt, Main Beilstein-Institut zur Förderung der Chemischen Wissenschaften 2018 18 Beilstein journal of nanotechnology 9 187 204 10.3762/bjnano.9.21 Institut für Chemie OPUS4-9517 misc Junginger, Mathias; Kübel, Christian; Schacher, Felix H.; Müller, Axel H. E.; Taubert, Andreas Crystal structure and chemical composition of biomimetic calcium phosphate nanofibers Calcium phosphate nanofibers with a diameter of only a few nanometers and a cotton-ball-like aggregate morphology have been reported several times in the literature. Although fiber formation seems reproducible in a variety of conditions, the crystal structure and chemical composition of the fibers have been elusive. Using scanning transmission electron microscopy, low dose electron (nano)diffraction, energy-dispersive X-ray spectroscopy, and energy-filtered transmission electron microscopy, we have assigned crystal structures and chemical compositions to the fibers. Moreover, we demonstrate that the mineralization process yields true polymer/calcium phosphate hybrid materials where the block copolymer template is closely associated with the calcium phosphate. 2013 7 11301 11308 urn:nbn:de:kobv:517-opus4-95176 Institut für Chemie