Materials Literature
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We study the changes in the low-frequency vibrational dynamics of poly(isobutylene) under pressure up to 1.4 GPa, corresponding to a density change of 20%. Combining inelastic neutron, x-ray, and Brillouin light scattering, we analyze the variations in the boson peak, transverse and longitudinal sound velocities, and…
Abstract There is a need for highly sensitive, multi‐parallel protein sensors within diagnostics and proteomic research. Conjugated polymers (CPs) have been demonstrated as highly sensitive optical probes for protein biosensing. Compared to small molecules, the polymeric probe has the possibility of multiple interacti…
We present a robust and straightforward approach for fabricating a novel colloidosome system where colloidal particles are assembled to form colloidal shells on the surface of stimuli-responsive microgel scaffolds. We demonstrate that the structural properties of the colloidal shells can be controlled through the coll…
We demonstrate that the charge distributions in Hubbard-model representations of transition metal oxide heterojucntions can be described by a Thomas-Fermi theory in which the energy is approximated as the sum of the electrostatic energy and the uniform three-dimensional Hubbard model energy per site at the local densi…
Frequency dependent exchange correlation kernels for time-dependent density functional theory can be used to construct approximate exchange-correlation potentials. The resulting potentials are usually not translationally covariant nor do they obey the so-called zero-force condition. These two basic symme-try requireme…
Spin reorientation has been observed in $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ thin single crystalline films epitaxially grown on (100) MgO substrate upon varying the film thickness. The critical thickness for such a spin-reorientation transition was estimated to be $300\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.…
We have investigated the effect of the magnetic field (B) on the very low-temperature equilibrium heat capacity ceq of the quasi-1 D organic compound (TMTTF)2Br, characterized by a commensurate Spin Density Wave (SDW) ground state. Below 1K, ceq is dominated by a Schottky-like contribution, very sensitive to the exper…
On the basis of density functional theory electronic band structure calculations using the augmented spherical wave method, the electronic and magnetic properties of the orthorhombic and tetragonal phases of ${\mathrm{Ca}}_{3}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ were investigated and the spin exchange interactions of th…
Systematic variation in the electrical conductivity of poly(3,4-ethylenedioxythiophene) (PEDOT) was achieved by oxidative chemical vapor deposition (oCVD). For oCVD, both the oxidant, Fe(III)Cl 3, and 3,4-ethylenedioxythiophene (EDOT) monomer are introduced in the vapor phase. A heated crucible allows for sublimation…
Size and shape do matter sometimes: Nanocrystals of noble metals are attractive for use as catalysts because of their high surface-to-volume ratios and high surface energies, which result in their surface atoms being highly active. Recently reported platinum nanocrystals with a novel tetrahexahedral shape reveal an en…
It has been recently shown that the strength of plasmon coupling between a pair of plasmonic metal nanoparticles falls as a function of the interparticle gap scaled by the particle size with a near-exponential decay trend that is universally independent of nanoparticle size, shape, metal type, or medium dielectric con…
At interfaces between complex oxides, electronic systems with unusual electronic properties can be generated. We report on superconductivity in the electron gas formed at the interface between two insulating dielectric perovskite oxides, LaAlO3 and SrTiO3. The behavior of the electron gas is that of a two-dimensional…
This paper is concerned with the study of the influence of electrochemical pre-treatments on the behavior of highly boron doped diamond electrodes. Anodic and cathodic preconditioning performed either with 10-4 A.cm-2 or 10-1 A.cm-2, have been studied. Cyclic voltammetry at as-deposited, anodically and cathodically tr…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The fabrication of axicons by cw laser effusion is introduced for the case of a chalcogenide alloy, and experimental results concerning the lateral resolution and the intensity distribution along the optical axis are reported.
Silicone-urea copolymers were modified by the chemical incorporation of polyethers (PEO and PPO) into the polymer backbone. Resulting materials were characterized by dynamic mechanical analysis, tensile tests, water absorption studies and refractive index measurements. Depending on the type, average molecular weight a…
Abstract Cis / trans isomerization of peptide CN bonds is involved in the configurational changes and are definitive for the bioactivity of peptides and proteins. The basic molecular character and origin of the restricted rotation of the peptide CN bonds are briefly introduced, as well as the methods used for study…
Abstract Multicomponent metal oxide (MMO) crystallites are prepared by spraying a reactant solution into a receiving solution or into air under microwave radiation at atmospheric pressure. The injection of a nitric acid solution through an ultrasonic nozzle into a receiving solution of metal precursor and the use of m…
Libraries of liquid crystal mixtures are formulated via inkjet printing, by varying the specific number of drops of each component overprinted in each position to create a large array of discrete, known mixtures (see figure). Screening by using a high throughput technique for the determination of phase transitions ide…
Einschließlich Bor: Mit K7B7Si39 (siehe Struktur; große Kugeln: K, kleine Kugeln: Si, B) wurde erstmals eine Clathrat-I-Verbindung mit Bor hergestellt. Dieses Borosilicid hat mit 9.952(1) Å den kleinsten Gitterparameter aller intermetallischen Clathrat-I-Verbindungen. Seine Zusammensetzung entspricht dem Zintl-Konzept.