Materials Literature
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Abstract A model for the cathode potential vs. time relationship during the galvanostatic charge process for metal hydride electrodes has been derived on the basis that the adsorbed hydrogen produced at the electrode surface by charge transfer of the Volmer reaction diffuses through the bulk electrodes, i.e., α, (α+β)…
Abstract New mechanistic knowledge of antioxidant and photoantioxidant mechanisms is interpreted to meet the requirements of processing stability and durability of commercial plastics, rubbers and coatings in hostile environments. Factors reducing stabilizer activity and some ecological concerns dealing with polymer s…
Various Cu–Ti–B alloys were produced via argon atomisation at 1400°C. Rapidly solidified powders, containing dispersed TiB2 particles, were subsequently subjected to thermal treatment in hydrogen at temperatures between 300 and 600°C. This process resulted in the formation of fine, metastable Cu4Ti precipitates from t…
The genus Monanthes Haworth (Crassulaceae) is critically revised. 10 species and 1 heterotypic subspecies are recognized and classified into 3 sections in this study: sect. Monanthoidea incl. M. atlantica, M. lowei, M. brachycaulos, M. minima, M. pallens, M. icterica; sect. Monanthes incl. M. polyphylla ssp. polyphyll…
Nonohmic behavior is obtained for polycrystalline ZnO with copper as the only additive in the range 0.3 x 1 wt%. The effect of copper on the microstructure and electrical behavior of ZnO:Cu ceramics is investigated. The leakage current decreases and the breakdown electric field increases as the copper concentration in…
Birefringence data on Ag(+)-Na(+) ion-exchanged planar waveguides are presented that are experimentally determined by a high-frequency polarimetric technique. The examined systems exhibit positive stress-induced birefringence across the whole exchanged regions, corresponding to compressive stress fields of the order o…
The lattice oxygen content in sintered polycrystalline aluminum nitride substrates was measured via secondary ion mass spectrometry (SIMS). This was achieved by quantitative analysis of spatial and depth‐resolved ion images of polished specimens using the solid‐state standard addition method. The thermal conductivity…
Abstract The game of molecular engineering of LC systems via combination of molecular architecture and functionalization of mesogens has opened interesting perspectives in the field of liquid crystals. This contribution summarizes different examples of this interplay using discotic liquid crystals as its basis.
The ternary system Nd-Fe-Cu was investigated by means of optical and scanning electron microscopy, energy dispersive X-ray analysis and differential thermal analysis. The system can be split into three independent partial systems partitioned off by two quasibinary sections between Fe and NdCu 2 , and Fe and NdCu 6 . T…
Abstract This paper discusses various new aspects in the elasticity of rubbers and the statistics of elastomers. It is shown that the role of network topology is crucial in the statistics of rubbers. This is seen mostly on the influence of heterogeneities of crosslink density, which is also of practical interest. Stro…
Abstract The application of liquid crystalline siloxanes consisting of pentamethylhydrocyclosiloxane cores with attached cholesteryl‐, biphenyl‐ and photochromic spiropyran‐based mesogens as reversible optical data storage materials is demonstrated by grating formation with an argon ion laser beam operating in the UV…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of PMMA star polymers with siloxane cores via group-transfer polymerization using silyl ketene acetal functionalized cyclic siloxanesZ. Zhu, J. Rider, C. Y. Yang, M. E. Gilmartin, and G. E. WnekCite this: Macromolecules 1992, 25, 26, 7330–7333Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and stereophysical characterization of the Fischer-Palm-related 49-electron thiocarbonyl-capped triangular nickel clusters Ni3(.eta.5-C5H5-xMex)3(.mu.3-X)(.mu.3-Y) (x = 0, 1), containing .pi.-acceptor X and Y capping Ligands (X = Y = CS; X = CS, Y = CO): comparativ…
Abstract This review provides a brief introduction to the Langmuir‐Blodgett (LB) technique and to the utilization of ultrathin films in the fields of electronics and optics. The electrical and nonlinear optical properties of the Langmuir‐Blodgett monolayer and multilayers of organoruthenium complexes, ferrocene deriva…
Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), wide-angle X-ray powder diffractometry (WAXD) and Fourier transform infrared spectroscopy (FTIR) were used to investigate the crystallization behavior of PHB granules from Alcaligenes eutrophus isolated by enzymatic purification. TEM exam…
Effects of hydrostatic pressure on the ferroelectric and related structural transitions are briefly reviewed. The lowest-order effect of pressure is a linear change of the transition temperature. The sign of the pressure coefficient of the transition temperature of a structural phase transition provides information on…
A self-consistent field theory was developed to account for the micellization of block copolymers in selective solvents. The mean-field expression used successfully by Edwards in treating the polymer excluded-volume problem was modified to enable it to be applied to chains in bad solvents without the generation of unr…
Abstract Several tetraazaporphyrins (TAPs) have been characterized by electronic absorption, fluorescence, and magnetic circular dichroism (MCD) spectroscopy, together with electrochemical methods. The absorption coefficients (ε) and band positions change markedly with changing TAP structure and solvent. The potential…
Poly-β-hydroxybutyrate (PBH) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PH…
In order to study the in vivo digestion of immobilized collagen and gelatin, these proteins labeled with 125I or fluorescein isothiocyanate (FITC) were covalently immobilized onto silicone surfaces, which were grafted with acrylic acid to introduce carboxyl groups, and implanted subcutaneously in rats and mice. When t…