Materials Literature
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The structure of CePS 4 has been determined from single-crystal X-ray diffraction data ( I 4 1 / acd space group, a = b = 10.9228(3) Å, c = 19.3998(6) Å, V = 2314.5(2) Å 3, Z = 16). The refinement, conducted from 547 independent reflections ( I > 3σ( I ) and 30 variables) led to R F (%) = 1.83 and R wF (%) = 2.36. Dif…
Electrooptic and optical characteristics of polymer-stabilized ferroelectric liquid crystal (PSFLC) materials prepared under different conditions were characterized. Polymerization behavior and segregation properties were also investigated. The rate of polymerization during formation of PSFLCs increases significantly…
The high-pressure behavior of layered V 2 O 5 is investigated using in situ Raman spectroscopy in a diamond anvil cell. Upon compression, the mode associated with the vanadyl V O double bond at 997 cm - 1 softens and vanishes at about 10 GPa. Above 7 GPa, additional modes appear in the V−O stretching region, at lower…
The 5-oxaporphyrin macrocycle is a modified porphyrin (with an oxygen atom replacing a meso-methine unit) that is produced during heme degradation in biological and chemical systems. We have undertaken an investigation into the chemical reactivity of metal complexes of this macrocycle. Here we report that the diamagne…
The surface state and active sites of a fresh Mo 2 N/Al 2 O 3 were investigated by FTIR, volumetric chemisorption, and TPD-MS techniques. It has been found that adsorption properties of CO on the fresh sample are quite different from those of the reduced passivated one. For reduced passivated Mo 2 N/Al 2 O 3, the IR s…
The electrochemical and chemical oxidation of the defect perovskite SrFeO 2.5 to the cubic perovskite SrFeO 3 at ambient temperature in alkaline electrolyte are shown to be in principle reversible processes with the appearance of intermediate compounds; the oxidation can be described by the formation of line phases Sr…
A novel solventothermal route to group II−VI nanocrystalline CdE (E = S Se, Te) semiconductors has been successfully developed. The reaction can be expressed as CdC2O4 + E CdE + 2CO2↑. As-prepared CdE powders in polyamines such as ethylenediamine, diethylenetriamine, and triethylenetetraamine display rodlike morpholog…
MFI-supported films were prepared using secondary growth of precursor layers. The precursor layers were prepared free of additives and no calcination step was used before secondary growth. Combined microstructural control over film thickness, orientation, continuity, and surface roughness was achieved. Hydrothermal co…
The electronic structure of VO$_2$ is studied in the frameworks of local density approximation (LDA) and LDA+$U$ to give a quantitative description of the metal-insulator (MI) transition in this system. It is found that, both structural distortion and the local Coulomb interaction, play important roles in the transiti…
Starch-based coatings were applied to extend storage life of strawberries ( Fragaria × ananassa ) stored at 0 °C and 84.8% relative humidity. The effects of amylose content of the starch, the type of plasticizer (glycerol and sorbitol), and the inclusion of antimicrobial agents on coating formulation were analyzed. Mi…
It is now established that hexagonally ordered domain structures can be formed in anodic alumina films by repeated anodization and stripping of the porous oxide. We find that the domain size is a linear function of time and increases with temperature. The pore density is initially high but decreases with anodizing tim…
Four organosilver(I) complexes of polycyclic aromatic hydrocarbons (PAHs) have been investigated crystallographically. The aim was to establish whether a favorable combination of cation-π interactions and aromatic stackings might produce functional organometallic solid materials with novel networks. Complete structure…
The formation of pyramid-like structures in thin-film growth on substrates with a quadratic symmetry, e.g., {001} surfaces, is shown to exhibit anisotropic scaling as there exist two length scales with different time dependences. Analytical and numerical results indicate that for most realizations coarsening of mounds…
A survey is presented of the theoretical status of quadratic response theories for the understanding of nonlinear aspects in the interaction of charged particles with matter. In the frame of the many-body perturbation theory we study the interaction of charged particles with the electron gas, within the random-phase a…
A new approach to heavy metal ion adsorbents based on the covalent grafting of 3-mercaptopropylsilyl groups to the framework pore walls of mesoporous silica molecular sieves has been investigated with regard to hydroxyl group densities, channel dimensions, and morphologies. Two types of silicas were examined, namely,…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
We investigate the influence of solvation media upon the relationship among structure, spatial distribution of electron density, and linear and nonlinear electric properties for two series of push−pull π-conjugated molecules. The analysis is performed on both electronic and vibrational components of static polarizabil…
The conductance through a quantum point contact created by a sharp and hard metal tip on the graphite surface has features which to our knowledge have not been encountered so far in metal contacts or in nanowires. In this paper we first investigate these features which emerge from the strongly directional bonding and…
We identify a fundamental morphological instability of mobile dislocations in crystals and related line defects. A positive gradient in the local driving force along the direction of defect motion destabilizes long-wavelength vibrational modes, producing a ``fingering'' pattern. The minimum unstable wavelength scales…
Relaxations at nonpolar surfaces of III-V compounds result from a competition between dehybridization and charge transfer. First principles calculations for the (110) and (10$\bar{1}$0) faces of zincblende and wurtzite AlN, GaN and InN reveal an anomalous behavior as compared with ordinary III-V semiconductors. Additi…