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Schmidt M.,Max Planck Institute for Biophysical Chemistry | Reinscheid F.,Max Planck Institute for Biophysical Chemistry | Sun H.,Max Planck Institute for Biophysical Chemistry | Abromeit H.,Friedrich - Schiller University of Jena | And 4 more authors.
European Journal of Organic Chemistry | Year: 2014

The prototypic molecule for conformational rigidity, that is, strychnine, exhibits fast conformational exchange on the NMR timescale at room temperature. A comprehensive description of this up-to-now-hidden stereodynamic behavior is presented, which combines experimental and computational data. The prototypic molecule for conformational rigidity, that is, strychnine, exhibits fast conformational exchange on the NMR timescale at room temperature. A comprehensive description of this up-to-now-hidden stereodynamic behavior is presented, which combines experimental and computational data. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Rahim M.I.,Helmholtz Center for Infection ResearchInhoffenstrasse 738124Braunschweig Germany | Tavares A.,Institute for Multiphase Processes | Evertz F.,Institute for Multiphase Processes | Kieke M.,Institute for Inorganic Chemistry | And 9 more authors.
Journal of Biomedical Materials Research - Part B Applied Biomaterials | Year: 2016

Magnesium alloys have promising mechanical and biological properties for the development of degradable implants. However, rapid implant corrosion and gas accumulations in tissue impede clinical applications. With time, the implant degradation rate is reduced by a highly biocompatible, phosphate-containing corrosion layer. To circumvent initial side effects after implantation it was attempted to develop a simple in vitro procedure to generate a similarly protective phosphate corrosion layer. To this end magnesium samples were pre-incubated in phosphate solutions. The resulting coating was well adherent during routine handling procedures. It completely suppressed the initial burst of corrosion and it reduced the average in vitro magnesium degradation rate over 56 days almost two-fold. In a small animal model phosphate coatings on magnesium implants were highly biocompatible and abrogated the appearance of gas cavities in the tissue. After implantation, the phosphate coating was replaced by a layer with an elemental composition that was highly similar to the corrosion layer that had formed on plain magnesium implants. The data demonstrate that a simple pre-treatment could improve clinically relevant properties of magnesium-based implants. © 2016 Wiley Periodicals, Inc. Source


Brede F.A.,Institute for Inorganic Chemistry | Mandel K.,Fraunhofer Institute for Silicate Research | Schneider M.,Fraunhofer Institute for Silicate Research | Schneider M.,University of Wurzburg | And 3 more authors.
Chemical Communications | Year: 2015

An innovative mechanochemical method is reported for the in situ formation of crystalline metal-complexes on the surface of superparamagnetic nanocomposite microparticles. The process is demonstrated for coating Fe3O4 multicore-silica matrix particles with the 1,2,4-1H-triazole complex [ZnCl2(TzH)2]. The use of mechanochemistry demonstrates a flexible process to obtain functional shells on magnetic particle cores without the need for complicated surface-functionalisation reactions in solution. Simple mixing of the desired shell-precursors ZnCl2 and 1,2,4-1H-triazole (TzH) with the magnetic particles in a ball mill is sufficient to tailor the particle surfaces with novel functionalities while retaining the superparamagnetic behaviour. © The Royal Society of Chemistry 2015. Source


Konig J.D.,Fraunhofer Institute for Physical Measurement Techniques | Winkler M.,Fraunhofer Institute for Physical Measurement Techniques | Buller S.,Institute for Inorganic Chemistry | Bensch W.,Institute for Inorganic Chemistry | And 3 more authors.
Journal of Electronic Materials | Year: 2011

In this work, Bi 2Te 3-Sb 2Te 3 superlattices were prepared by the nanoalloying approach. Very thin layers of Bi, Sb, and Te were deposited on cold substrates, rebuilding the crystal structure of V 2VI 3 compounds. Nanoalloyed super- lattices consisting of alternating Bi 2Te 3 and Sb 2Te 3 layers were grown with a thickness of 9 nm for the individual layers. The as-grown layers were annealed under different conditions to optimize the thermoelectric parameters. The obtained layers were investigated in their as-grown and annealed states using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray (EDX) spectroscopy, transmission electron microscopy (TEM), and electrical measurements. A lower limit of the elemental layer thickness was found to have c-orientation. Pure nanoalloyed Sb 2Te 3 layers were p-type as expected; however, it was impossible to synthesize p-type Bi 2Te 3 layers. Hence the Bi 2Te 3-Sb 2Te 3 superlattices consisting of alternating n- and p-type layers showed poor thermoelectric properties. © 2011 TMS. Source


Fu M.-L.,Karlsruhe Institute of Technology | Fu M.-L.,Institute for Inorganic Chemistry | Issac I.,Karlsruhe Institute of Technology | Issac I.,Institute for Inorganic Chemistry | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2010

Between molecule and bulk phase: The three title compounds are examples of ligand-stabilized clusters having significant structural features of the corresponding binary copper(I) chalcogenides. The cluster shown, [Cu 136S56(SR)24(dpppt)10], can be seen as an approximate 1.2 x 1.4 x 1.9 nm3 section of a cubic phase Of Cu2S. The background shows a typical X-ray diffraction image of a single crystal of the cluster. Chemecal equation reprsented © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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