Materials Literature
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A room-temperature synthesis route for thin films of amorphous silica ( a -SiO 2 ) based on irradiation of a silicon-containing polymer by UV light in pure O 2 atmosphere has been developed. The chemical conversion of spin-coated films of poly(pentamethyldisilylstyrene) (pPMDSS) to silicon oxycarbide and finally to am…
The melt condensation polymerization of the AB 2 monomer dimethyl 5-(2-hydroxyethoxy)isophthalate exhibits unusual molecular weight growth characteristics. The number-average molecular weight ( M n ) reaches a plateau value after a relatively short polymerization time, whereas the weight-average molecular weight ( M w…
Colossal magnetoresistance manganites in a wide composition range can be systematically characterized by Raman spectrometry with respect to the cation substitution in the A sublattice of the perovskite structure, oxygen isotope exchange, and variations of the ${\mathrm{Mn}}^{3+}{/\mathrm{M}\mathrm{n}}^{4+}$ ratio. The…
Semiinterpenetrating polymer networks (semi-IPNs) were synthesized from castor oil-based polyurethane (PU) and 20 wt % nitrokonjac glucomannan (NKGM) with weight-average molecular weights ( M w ) from 2.86 × 10 4 to 14.1 × 10 4 . Results from the dynamic mechanical analysis, differential scanning calorimetry, wide-ang…
The calcination kinetics of ammonium pentaborate was investigated by thermogravimetry (TG) using the Coats−Redfern and genetic algorithm methods. Various methods for determining the reaction parameters using thermal analysis data were improved. Genetic algorithms can be considered as a new method for the determination…
${}^{151}\mathrm{Eu}$ (and ${}^{57}\mathrm{Fe})$ high-pressure M\"ossbauer investigations on ${\mathrm{EuFe}}_{2}{\mathrm{P}}_{2}$ reveal that the pressure-induced isostructural phase transition $3\ensuremath{\lesssim}p\ensuremath{\lesssim}9$ GPa is accompanied by a continuous valence transition from ${\mathrm{Eu}}^{2…
Glucose-triacylglycerol (TAG) mixed substrates were used to modulate the physical and mechanical properties of medium-chain-length poly(hydroxyalkanoates) (mcl-PHAs). Pseudomonas resinovorans NRRL B-2649 grew and produced mcl-PHAs on glucose and TAGs (coconut oil, C; soybean oil, S) after 24 h in a shake flask culture…
The organic gelator 1,3:2,4-dibenzylidene sorbitol (DBS) self-organizes to form a 3-D network stabilized by hydrogen bonds at relatively low concentrations in a variety of nonpolar organic solvents and polymers. The resultant network consists of nanofibrils and is responsible for the physical gelation of the matrix co…
We find the exact ground state energy and magnetic moment for an arbitrary magnetic field H of the classical Heisenberg model of spins on the vertices of an icosidodecahedron. This model provides an accurate description of the magnetic properties of the giant paramagnetic molecule ${{\mathrm{Mo}}_{72}{\mathrm{Fe}}_{30…
The luminescence sensitivity of natural quartz is significantly enhanced if heated beyond the first and second crystal phase transitions, in the temperature range 500-1100 °C. This work employs a number of complementary spectroscopic methods to obtain a fuller understanding of the mechanisms of this sensitization proc…
Summary The pulp and paper industry in China has been growing rapidly as the nation's population and economy have grown. As a result, there has been a huge demand for pulp and paper raw materials. China has a long tradition for using non-wood raw materials for pulp and paper due to its limited forest resources and ric…
The effect of different impurity levels in nickel on the quality of the primary recrystallization cube texture after intense cold rolling was investigated. Texture sharpness and thermal stability in the 99.9 at% nickel tapes could be improved by micro-alloying with molybdenum and tungsten as well as with niobium and t…
Simple structures of MnX binary compounds, namely hexagonal NiAs and zincblende, are studied as a function of the anion (X = Sb, As, P) by means of the all-electron FLAPW method within local spin density and generalized gradient approximations. An accurate analysis of the structural, electronic and magnetic properties…
We investigate the adsorption of a Ni monolayer on the $β$-SiC(001) surface by means of highly precise first-principles all-electron FLAPW calculations. Total energy calculations for the Si- and C-terminated surfaces reveal high Ni-SiC adsorption energies, with respect to other metals, confirmining the strong reactivi…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The pair distribution function of solute particles determined by simulation of true mixtures with diameter ratios of 5, 10 and 20 is compared with that obtained in their representation by effective one-component fluids with pairwise additive interactions. The pair distribution function near contact is found to be over…
The ground-state electronic structure and bonding of two important laser crystals, ${\mathrm{BeAl}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{LiYF}}_{4},$ were calculated using a first-principles method based the local approximation of the density-functional theory. The results were compared with similar calculations on seve…
Solid-state exchange reactions between carbon halides and lithium acetylide catalyzed by cobalt dichloride enable the rapid synthesis of carbon nanotubes as observed by TEM. Without the catalyst, only graphite and amorphous carbon form. These reactions are self-propagating and can be initiated with a heated filament.…
The synthesis of two metal phthalocyanine monomers, GePc[OSi( n -C 6 H 13 ) 3 ] 2 and SnPc[OSi( n -C 6 H 13 ) 3 ] 2, and two μ-oxo-bridged dimers, ( n -C 6 H 13 ) 3 SiOSiPcOGePcOSi( n -C 6 H 13 ) 3 and ( n -C 6 H 13 ) 3 SiOSiPcOSnPcOH, are described. The ground-state absorption spectra and excited-state dynamics of th…
Point defects of opposite signs can alternately nucleate on the -1/2 disclination line that forms near the free surface of a confined nematic liquid crystal. We show the existence of metastable configurations consisting of periodic repetitions of such defects. These configurations are characterized by a minimal interd…