Materials Literature
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The kinetics of weak gelation is modelled as a system of spherical particles interacting with sticky hard-sphere pair potentials. Gradual cross-linking of primary particles to form disordered non-close-packed aggregates of greater total excluded volume than the separate non-bonded primary particles leads to a steady i…
The presence of metal particles within a gas-insulated switchgear (GIS) might initiate a sparkover and lead to fatal failure of an electric power transmission system. In order to investigate the behavior of a particle in a GIS, the model electrodes and the measuring system are constructed. The motion of a particle was…
The reoxidation process in highly Ce 3+ ‐doped BaTiO 3 ceramics was studied using TEM. Samples of two different types of solid solutions, Ba 1−X Ce 3+ X Ti 1−X/4 ( V Ti ) X/4 O 3 and Ba 1−X Ce 3+ X Ti 4+ 1− X Ti 3+ X O 3 , were prepared by sintering oxide mixtures in air and in a reducing atmosphere, respectively. T…
Some of the fundamental properties of the reactive semiconductor–electrolyte interface are outlined and possibilities for electrochemical modification of semiconductor surfaces are discussed. The present status of investigating the physicochemical and morphological changes after (photoelectrochemical) processing is re…
Current consumer demands have led to increased interest in subjective evaluation of textile properties, but their assessment is often carried out by using techniques which cannot be justified as strictly valid. Tests in which a standard comparison is available are usually more likely to correlate well with objective m…
Cerium dioxide is a rare earth oxide material that can be useful in various optical and electronic applications because of its high refractive index and its dielectric constant. The purpose of this study was to conduct an x-ray photoelectron spectroscopy analysis of sputtered cerium dioxide thin films. The thin films…
The thermal behaviour of binary mixtures of 1-(4-pyridyloxy)-5-[4-(4-butylphenylazo)phenoxy]pentane (Bu-azo-5-Pyr) and 1-(4-pyridyloxy)-6-[4-(butylphenylazo)phenoxy]hexane (Bu-azo-6-Pyr) with 4-octyloxybenzoic acid is reported. Both systems are miscible over the complete composition range; this miscibility is attribut…
A number of recent reviews and books on silkworm and spider silks have been published and the historical aspects of the field are reviewed therein (Livengood, 1990; Robson, 1985; Asakura and Kaplan, 1995; Kaplan et al., 1991, 1992b, 1994). Silks can be defined as externally spun fibrous protein secretions. Of the natu…
The kinetics of depletion of the first-row transition-metal atoms Co and Ni upon interactions with O 2, NO, and N 2 O were studied in a fast-flow reactor at a He pressure of 0.70 Torr. The depletion rate constants were determined for the first and second excited states of both atoms, Co(b 4 F J, a 2 F J ) and Ni(a 3 D…
The glass transition temperature ( T g ) of wool and its dependence on water content is reinvestigated using differential scanning calorimetry (dsc). Previous studies with dsc have not accounted for the influence of thermal history, which may introduce a large variability in T g measurements. Because the T g of wool i…
Discotic cholesteric phases with extremely small pitches were obtained with cellobiose derivatives as chiral dopants. These binary mixtures tend to form up to three distinct blue phases. An interesting property of these mixtures is that the blue phases can be supercooled to a glass-like state. Microscopic studies, ref…
Structures of the inclusion compounds formed between the host compound 1,1-bis(4-hydroxyphenyl)cyclohexane and the isomers of picoline have been elucidated. The activation energies and the kinetics of desolvation for the complexes have been determined. Competition experiments have been performed to investigate which i…
The ultradispersed diamond (UDD) powders synthesized by the detonation of explosives with negative oxygen balance are new nano-materials with practical value. In this paper, the detonation soot and UDD powders were used as an additive in paraffin oil. This kind of two-phase lubricant possesses excellent load-carrying…
In the presence of [MoH(SC6H2Pri3-2,4,6)3(PMePh2)] in tetrahydrofuran (thf), anhydrous N2H4 disproportionates to N2 and NH3 or is reduced to NH3 by Zn–HOC6H3Pri2-2,6 (69–81% conversion over 16 h). Reaction of [MoH(SC6H2Pri3-2,4,6)3(PMePh2)] with anhydrous N2H4 in thf–MeOH at low temperature gave the complex [MoH(SC6H2…
Synthesis and crystal structure of [C 6 H 10 N 2 ]Pb 2 I 6 ·3thf which contains a novel lead iodide polymeric anion with a double-chain structure.
Soluble matrices of four Scleractinian skeletons (Madrepora, Favia, Leptastrea and Fungia), were extracted and studied by isoelectric focusing (IEF). The main part of the extracted matrices is acidic. IEF gels are poorly stained or unstained by Coomassie Blue and silver. The positive Alcian Blue staining is indicative…
The existing isotropic model equations of hysteresis in magnetic materials have been extended to include the effects of anisotropy and texture. This has proved particularly important as the model has been used to describe an increasing range of magnetic materials in which anisotropy plays a significant role, for examp…
Natural rubber (NR) in a typical semi-efficient vulcanization system was modified with flame-retardant additives such as bromo derivative of phosphorylated cashew nut shell liquid, antimony trioxide and alumina tri hydrate (ATH). Improvement in the flame retardancy of the vulcanizates was shown by the progressive incr…
The approach of simultaneous substitutions by aiming at a systematic dilution of both of the sublattices to obtain the highest possible magnetization in a given system has been made use of, since this parameter is highly desirable in the fabrication of core materials for switched mode power supplies (SMPS), Ferrite se…
The ability to prepare polymer films on the surface of glassy carbon electrodes (GCEs) by electrochemical polymerization of transition-metal complexes of 5-amino-1,10-phenanthroline (aphen) was investigated. Eight different metal ions (Mn II , Fe II , Co II , Ni II , Cu II , Zn II , Ru II and Os II ) were studied. A s…