Materials Literature
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Making use of the tight-binding Green's function technique, we have calculated the STM images of graphite with surface and sub-surface defects, while taking into account the relaxation of the lattice due to defects. We have demonstrated that two different physical mechanisms may result in the formation of hillocks in…
We present ab initio local-density-functional electronic structure calculations for the (111) and (-1-1-1) surfaces of cubic BN. The energetically stable reconstructions, namely the N adatom, N3 triangle models on the (111), the (2x1), boron and nitrogen triangle patterns on the (-1-1-1) surface are investigated. Band…
We prepared high epitaxial thin films of the compound Sr_2FeMoO_6 with narrow rocking curves by pulsed laser deposition. The diagonal and nondiagonal elements of the resistivity tensor were investigated at temperatures from 4 K up to room temperature in magnetic fields up to 8 T. An electronlike ordinary Hall effect a…
Introduction and historical background synthesis of polycarbonates quantum MO calculations, levy-stable distributions and molecular relaxation in polycarbonate polycarbonate dynamics by NMR non-bisphenol A polycarbonates mechanical properties of polycarbonates optical properties of polycarbonates PVT, specific heat an…
Globular clusters are spherical, densely packed groups of stars found around galaxies. They are thought to have formed at the same time as their host galaxy and thus provide a powerful probe for understanding stellar and galaxy evolution, as well as being studied as objects of interest in their own right. This timely…
The Jahn-Teller effect is used semi-theoretically to analyse UV visible spectra of the diamond-like carbon films on Si substrates. By deconvolution of UV visible absorption spectra of the typical films, different absorption lines are found. For each sample, six lines are distinguished, which were related to V° by the…
A group analysis of a class of drift-diffusion systems is performed. In account of the presence of arbitrary constitutive functions, we look for Lie symmetries starting from the weak equivalence transformations . Applications to the transport of charges in semiconductors are presented and a special class of solutions…
Dithiadiazafulvalenes (DTDAF) can be formed either chemically or electrochemically. Electrochemical investigations have been carried out on 2-ethylthio-1,3-thiazolium salts to determine the redox behavior of dithiadiazafulvalenes formed by cathodic coupling. Using an in situ method, the donor has been trapped in the m…
The low-temperature heat capacities of the two ternary intermetallic compounds GdNiGa and GdNiIn, which order ferromagnetically at 30.5 and 93.5 K respectively, were measured as a function of the magnetic field up to 9 tesla. From the experimental data the isothermal magnetic entropy change ( S magn ) and the adiabati…
Amphiphilic mixed ion smectite clays have been prepared by the reaction of inorganic ion exchanged forms of synthetic fluorohectorite with [C 16 H 33 EBu 3 + ] onium ions, where E is N or P. Regardless of the initial inorganic exchange cation (Li +, Na +, Ca 2+, Ba 2+, Al 3+, Ce 3+ ), heterostructures with regularly s…
The use of dimethyldichlorosilane as a coupling agent for the grafting of VO x structures on the MCM-48 surface produces a material that is simultaneously hydrophobic (immiscible with water) and very active (all V centers are accessible, even for water molecules). The VO x surface species are grafted by the molecular…
The elastic properties of the vitreous system Bi 2 O 3 -B 2 O 3 have been measured by ultrasonic pulse echo overlap technique at a frequency of 10 MH z and at room temperature. For the purpose of measuring the ultrasonic velocity with high accuracy, the McSkimin criterion for determining the correct cyclic overlap bet…
The glass transition temperature ( T g ) and viscosity of aqueous trehalose and its mixtures with either NaCl or Na 2 B 4 O 7 (borax) have been measured over a wide range of concentration. Borax and sodium chloride increase the viscosity and T g ‘ of aqueous trehalose. Although the presence of ionic charges may partly…
Using the molecular-kinetic theory of wetting, we analyze the dynamic contact angle of a sessile drop of squalane spreading spontaneously on Langmuir−Blodgett multilayer substrates (behenic acid on glass). This allows the effect of microscale roughness on the parameters appearing in the theory to be determined. In par…
We prepared ZnO, CdO, and PbO rock salt-coordinated and ZnO wurtzite-coordinated nanoclusters with a microemulsion method in the AOT reverse micelle. X-ray and electron beam diffraction techniques indicate that all have amorphous structures. The similarity of the UV−visible absorption and photoluminescence spectra at…
A novel, pulsed, supersonic, cluster-beam source based on microplasma ablation has been realized and tested. Its intensity and stability allows one to overcome the limitations encountered in laser vaporization and pulsed arc cluster sources. Supersonic carbon cluster beams have been obtained and characterized. Target…
We have investigated spatio-temporal kinetics of electron spin polarization in semiconductor narrow 2D strip and explored the ability to manipulate spin relaxation. Information about spin of the conduction electrons and mechanisms of spin rotation is incorporated into transport Monte Carlo simulation program. A model…
We study the effect of crystal symmetry and step-edge diffusion on the surface current governing the evolution of a growing crystal surface. We find there are two possible contributions to anisotropic currents, which both lead to the destabilization of the flat surface: terrace current (j_t), which is parallel to the…
Poly(epichlorohydrin) (PECH) was modified to a considerable extent with mesogenic acids, namely 4‘-(ω-alkenoxy)-4-biphenylcarboxylic acids and 6-(ω-alkenoxy)-2-naphthalenecarboxylic acids, which leads to side chain liquid crystalline polymers which can be cross-linked through their terminal double bonds in a further s…
The adsorption properties of mesoporous materials belonging to the MCM-41 family can be advantageously coupled to a selected electron-transfer reaction after their incorporation into a conductive composite matrix. This has been demonstrated via the voltammetric monitoring of the selective mercury(II) binding to pure s…