Materials Literature
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Amorphous glassy materials of diverse nature -- concentrated emulsions, granular materials, pastes, molecular glasses -- display complex flow properties, intermediate between solid and liquid, which are at the root of their use in many applications. A classical feature, well documented yet not really understood, is th…
A single crystal of 7% Fe-doped (La0.7Pr0.3)0.65Ca0.35MnO3 shows up as a typical relaxor ferromagnet, where ferromagnetic metallic (FM) and charge-orbital-ordered insulating clusters coexist with controllable volume fraction by external stimuli. There, the persistent FM state can be produced by an electric-current exc…
Ein zweistufiges Syntheseverfahren wurde angewendet, um goldbeschichtete Ceroxidnanostäbe, -würfel und -polyeder herzustellen (siehe Bild), und ein starker Effekt der CeO2-Form auf die Aktivität als Katalysatoren für das Wassergas-Gleichgewicht trat auf. Gold auf den (110)-Flächen von Ceroxidnanostäben war am aktivste…
Molecular resonance quantified: The resonance Raman spectrum of rhodamine 6G is obtained at 532 nm and the scattering cross-sections are quantified using resonance broadband stimulated Raman spectroscopy. Thus, the molecular resonance and surface-enhanced effects in SERRS are quantified for the first time. The surface…
We review recent developments in the preparation of mesoporous metals and related metal-based nanomaterials. Among the many types of mesoporous materials, mesoporous metals hold promise for a wide range of potential applications, such as in electronic devices, magnetic recording media, and metal catalysts, owing to th…
Geordnete und amorphe mikroporöse Polytriazin-Netzwerke wurden durch Trimerisierung von Nitrilen in ZnCl2-Schmelzen bei 400 °C synthetisiert (siehe die Struktur des aus Tricyanbenzol erzeugten Polymers; C grau, N blau). Die Materialien sind Hochleistungspolymere mit sehr hohen Oberflächen und könnten Anwendung als Gas…
A two-step synthesis method is used to prepare gold-on-ceria nanorods, nanocubes, and nanopolyhedra (see picture), and a strong shape-effect of CeO2 on the water–gas shift reaction activity of the catalysts is identified. Gold on the (110) facets of ceria nanorods shows the highest activity.
Ordered and amorphous microporous polytriazine networks have been obtained from the trimerization of nitriles in a ZnCl2 melt at 400 °C (see structure of the polymer formed from 1,4-dicyanobenzene; C gray, N blue). The materials are high-performance polymers with very large surface areas and could find applications in…
The paper brings information on the influence of curing conditions such as humidity, variable temperature and chemical solutions, on the compressive strength and weight variation of the magnesia phosphate binding materials, obtained from magnesite, mono-ammonia phosphate, borax and sand having a granulation ranging be…
An Al-11.3Li-0.11Sc (at. %) alloy was double-aged to induce first alpha'-Al3Sc and then delta'-Al3Li precipitates. Atom-probe tomography revealed both single-phase delta'-precipitates and core-shell alpha'/delta'-precipitates (with respective average radii of 16 and 27 nm, and respective volume fractions of 12 and 9%)…
BACKGROUND: Scripting languages such as Python are ideally suited to common programming tasks in cheminformatics such as data analysis and parsing information from files. However, for reasons of efficiency, cheminformatics toolkits such as the OpenBabel toolkit are often implemented in compiled languages such as C++.…
We present a protocol to determine the angular orientation of surface-confined discotic molecules in ordered thin-film assemblies through a combination of polarized reflection absorption infrared spectroscopy (RAIRS) and polarized transmission infrared (IR) spectroscopy. We focus here on the determination of the orien…
Zinc selenide (ZnSe) bicrystal nanobelts with zinc blende structure were obtained via simple thermal evaporation of ZnSe powder and were further investigated by various transmission electron microscopy (TEM) techniques. The bicrystal nanobelts form by introducing {113} twinning. It is interesting to note that the comm…
The structures of two samples of gold nanoclusters supported on silica were studied by X-ray powder diffraction (XRD) and X-ray absorption spectroscopy. The data relative to both techniques were analysed by an approach involving simulation based on structural models and fitting. The XRD model concerned a distorted f.c…
Small-angle neutron scattering (SANS) provides a unique method to probe soft matter in the 10–100 nm length scale in solutions. In order to determine the shape and size of biological macromolecular structures correctly with SANS, a background-subtracted, undistorted scattering curve must be measured, and the required…
Monodisperse particles of periodic mesoporous organosilica (PMO) with ethane- and phenylene-bridging groups were prepared using 1,2-bis(triethoxysilyl)ethane (BTEE) and 1,4-bis(triethoxysilyl)benzene (BTEB) organosilica precursors, and a Pluronic P123 poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) (PE…
The preparation of single crystals suitable for X-ray analysis is frequently the most difficult step in structural studies of proteins. With the aid of two examples, it is shown that de novo solution of the crystallographic phase problem can be achieved at low resolution using microcrystalline powder samples via the s…
New measures of sharpness for symmetric powder diffraction peak profiles are proposed. The sharpness parameter is defined through the \nuth-order moment of the Fourier transform of the profile function. Analytical expressions for the sharpness parameter for empirical model profile functions, namely the Gaussian, logis…
Mixed condensation of 1,2-dicyanofullerene (1) and 4,5-dibutyloxyphthalonitrile (2a) in the presence of vanadium(III) chloride (VCl3) in quinoline forms the hexabutyloxy-substituted tribenzotetraazachlorin (TBTAC) - fullerene (C60) vanadyl complex (3). UV-vis absorption and magnetic circular dichroism (MCD) spectrosco…
This article discusses the relationship between the molecular structure of bolaamphiphiles bearing mesogenic groups and their interfacial self-organized morphology. On the basis of the molecular structures of bolaamphiphiles, we designed and synthesized a series of molecules with different hydrophobic alkyl chain leng…