Materials Literature
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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…
Oligo(ethylene oxide)-substituted polythiophenes mixed with a salt simultaneously act as a light-emitting layer and solid-state electrolyte in light-emitting electrochemical cells (LECs). Under an applied bias, p-doping of the electroluminescent polymer takes place at the anode. At the opposite electrode the cathode m…
A phase diagram of hexamethylbenzene−succinonitrile system, determined by the thaw−melt method, shows the formation of a eutectic and a monotectic with large miscibility gap in the system. The eutectic and the monotectic contain 0.150 and 0.996 mol fraction of succinonitrile, respectively, and the consolute temperatur…
A phosphorus-31 solid echo chemical shift anisotropy line shape study of tris(2-ethylhexyl) phosphate in tetramethyl polycarbonate determined the rate and amplitude of diluent motion in this mixed glass as a function of temperature and concentration. The dynamics of the diluent are observed to be bimodal with diluent…
Poly(methyl methacrylate- co -methacrylic acid) lead(II) salt ionomer [P(MMA- co -MAA)−Pb II ] has been prepared by the exchange reaction of poly(methyl methacrylate- co -methacrylic acid) with lead(II) acetate. PbS nanoparticles were synthesized by treating the [P(MMA- co -MAA)−Pb II ] powder with H 2 S. The average…
Core−shell particles consisting of a polystyrene (PS) latex colloidal core and Fe(II) metallo-supramolecular polyelectrolyte (Fe(II)−MEPE)/poly(styrenesulfonate) (PSS) multilayer shells were fabricated by the consecutive assembly of Fe(II)−MEPE and PSS on PS particles. The layers were deposited under conditions where…
The magnetization, magnetoresistance and elastic properties of Sm 0.56 (Sr 0.44- x Me x )- MnO 3 (Me = Ba, Cd, Ca) have been investigated. It is established that Sm 0.56 Sr 0.44 MnO 3 exhibits a metamagnetic behaviour as well as anomalous elastic properties in a wide range of temperatures above the Curie point T C = 1…
Extending the Debye approach for studying the specific heat of a crystal to a quasicrystal, this study gives the formula of the specific heat of a one-dimensional hexagonal quasicrystal.
The ceramics of new solid solutions of Ag 1- x Na x NbO 3 (ANN) have been sintered for the whole concentration range. Low frequency dielectric investigations (120-800 K) and DTA investigations (290-600 K) revealed a series of phase transitions. Two predominant aspects of the Na substitution have been found. The first…
Core-corona structures of poly(ethyleneoxide)/polybutadiene (PEO/PB) block copolymer micelles are directly resolved for the first time by examining rapidly vitrified samples by transmission electron microscopy at liquid nitrogen temperature (Cryo-TEM). Spherical micelles form at higher PEO/PB block volume ratio; cylin…
The hydrolytic properties of the novel biodegradable thermosensitive poly(organophosphazenes) with methoxypoly(ethylene glycol) (MPEG) and amino acid esters as side groups have been studied by means of gel permeation chromatography and 31 P and 1 H NMR spectroscopy and by identification of the hydrolysis products. The…
The synthesis of Co 5 (OH) 8 (C 7 H 15 CO 2 ) 2 ·4H 2 O, Co 5 (OH) 8 (O 2 CC 6 H 12 CO 2 )·5H 2 O, Co 5 (OH) 8 (C 12 H 25 SO 4 ) 2 ·(3H 2 O·2NH 3 ), and Co 5 (OH) 8 (C 2 N 3 ) 2 ·6H 2 O, their characterization by electron microscopy, XRD, TGA, IR, UV−vis, and XANES, and their magnetic properties are reported. They bel…