Materials Literature
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"In-situ" real time observation of the ferrite nucleation at nonmetallic inclusions has been successfully made at elevated temperatures with a confocal scanning laser microscope. The nucleation site, nucleation temperature, and/morphological change of the precipitates and ferrite can be sequentially determined as the…
Porous vanadium oxide materials were prepared by electrochemical deposition in the presence of surfactants. Both scanning electron microscopy and ac impedance results indicated a large increase in surface area compared with a sample prepared without surfactants. X‐ray diffraction and infrared spectroscopy results indi…
Article Revisiting the Complexity of Finding Globally Minimum Energy Configurations in Atomic Clusters was published on January 1, 1999 in the journal Zeitschrift für Physikalische Chemie (volume 211, issue 1).
Si nanocrystallites embedded in a silica matrix have been prepared by the sol-gel route using triethoxysilane as the precursor. The different steps of formation of silicon during thermal treatment of the gels were observed by X-ray diffraction, Raman and 29 Si MAS NMR spectroscopy. The gels were first pre-heat-treated…
The new podand ligand hydrotris[3-(6-methyl)pyridin-2-ylpyrazol-1-yl]borate [L1]– was prepared which contains three bidentate pyrazolyl/pyridine arms attached to a {BH}– head-group. This ligand differs from an earlier ligand hydrotris[3-(2-pyridyl)pyrazol-1-yl]borate [L2]– by the presence of methyl groups attached to…
The photoexcited triplet state of free-base porphycene randomly oriented in a glassy toluene matrix has been investigated by time-resolved electron paramagnetic resonance and electron spin echo spectroscopy over the temperature range 4–100 K. Spectral broadening and anisotropic relaxation are both observed as the temp…
Summary The influence of acetone, as a solvent on crystalline structure of the cellulose, was investigated. Crystalline changes brought about by the solvent treatment on the residual cellulose have been foundto be noticable. The crystallinity index of solvent treated celluloses has shown a trend of a small gradual inc…
A method is described for generating and displaying woven-fabric structures in three dimensions by computer graphics. The thread paths displayed are generated by using cubic B-splines, the mathematics of which is well developed, mainly for other areas of engineering design, especially in aerospace engineering. Some re…
The placement of simple saccharides within the micropores of the cell wall of never-dried pulp fibers to create a cellulose substitute is proposed as a means of reducing the fiber content, and hence the cost, of paper. The nature of the interaction between entombed monosaccharides, disaccharides, disaccharides, and tr…
Dramatic effects of chitin and chitosan on wound healing were demonstrated in field cases of many small animals (dogs and cats), food animals (338 cows) and 142 zoo animals. In comparison with conventional therapy with irrigation and antibiotic administration to wound, new treatment with chitin and chitosan permitted…
An accurate measure of the maturity of a sample of cotton is essential for assessing the quality of the fiber. Work has begun to produce large quantities of diverse cottons with well-defined values of fineness and maturity. The reference method for measuring fiber maturity based microscopic image analysis of thin sect…
Glutaconyl-CoA decarboxylase from Acidaminococcus fermentans (clostridal cluster IX), a strict anaerobic inhabitant of animal intestines, uses the free energy of decarboxylation (delta G(o) approximately -30 kJ mol-1) in order to translocate Na+ from the inside through the cytoplasmic membrane. The proton, which is re…
Sulfide species, HS-, S2- and H2S, are often the most common and important poisons that arise in practical situations of embrittlement of ferruginous metals by sorbed H. The absorption and permeation of H can be either enhanced or inhibited under conditions of cathodic polarization in the presence of HS-. The effect o…
Product studies on the oxidation of two 1-arylazo-2-hydroxynaphthalene-6-sulfonate dyes by peroxy acids and by tert-butyl hydroperoxide catalysed by iron(III) 5,10,15,20-tetra(2,6-dichloro-2-sulfonatophenyl)porphyrin in solution have been carried out. In single turnover experiments at pH 11.88, 9.30 and 6.93, dye blea…
In this work we consider the interaction of a laser-generated cavitation bubble with a solid boundary for the case of a cavity created very close to the wall. Using a combination of a thin-film transducer placed on the surface of the boundary and schlieren photography techniques we observe the induced pressure stresse…
It is important to obtain information about the collagen fiber orientation in biological fibrous tissues such as human and animal skins because the collagen fiber orientation in the skins may closely relate to the motional functions of the body. However, no reports are yet available on the distribution of collagen fib…
Formation of an ordered hexagonal mesoporous structure of siliceous materials in a homogeneous environment using Na2SiO3 as a silica source and cetyltrimethylammonium bromide as a structure directing agent has been studied by means of a time-resolved insitu X-ray diffraction technique. In this synthesis route the prec…
The oxidation of pyridines using a combined oxidant of hydrogen peroxide and benzonitrile catalysed by a basic hydrotalcite, Mg10Al2(OH)24CO3, gave high yields of the corresponding pyridine N-oxides. This solid hydrotalcite catalyst was easily separated from the reaction mixture and could be reused with retention of i…
The solubility products of the calcium salts of two polyhydroxy ligands (PHL), isosaccharinate (ISA) and gluconate (GLUC), were measured. Solubility products of log <em>K</em><sub>s,o</sub> = –6.22 ± 0.03 at <em>I </em>= 0 and <em>T</em> = 20 ± 1°C for Ca(α-ISA)<sub>2</sub>, and log <em>K</em><sub>s,o</sub> = –3.54 ±…
Stable functional complementary clusters, i.e. of the electrophilic and nucleophilic type, can be ‘added’ resulting in the planned formation of the related reaction products: the high-yield synthesis of the crystalline compounds [Me2NH2]10- [{(SiW11O39)Mo3S4(H2O)3(µ-OH)}2]·20H2O 1 and [Me2NH2]14[{(P2W17O61)Mo3S4(H2O)3…