Materials Literature
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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…
Principal component analysis (PCA) has been used to analyse mass spectral peptide profiles obtained from the enzymatic digestion of standard protein mixtures. Scores and loadings plots clearly revealed peptide fragments that differentiated one protein mixture from another. Peptide map search results identified with a…
One-step hydroxylation of benzene to phenol by N 2 O has been performed over structured catalytic beds made of ZSM-5 coatings on stainless steel grids. The catalysts demonstrated high activity with a selectivity toward phenol formation of 98%. A detailed kinetic study was carried out with a variation in reactant conce…
New phenanthroline-appended cholesterol organic gelator 1 was synthesized. It was shown from the gelation test that it acts as a versatile gelator of organic fluids such as DMSO, DMF, 1-propanol, acetic acid, etc. The sol−gel polymerization of tetraethoxysilane (TEOS) was carried out using the 1 + acetic acid gel. The…
The microstructure of segmented block copoly(ether esters) composed of poly(tetramethylene oxide) (PTMO) “soft” blocks and poly(butylene terephthalate) (PBT) “hard” blocks was investigated. A variety of analytical techniques, including 13 C solid-state NMR, infrared spectroscopy, dynamical mechanical analysis, dielect…
STM spectroscopy on the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ has been performed in the superconducting state with the use of single crystals. The anisotropy of the superconducting gap has been investigated both on the $…
The recently-discovered MgB2 super-conductor has a transition temperature Tc approaching 40K, placing it intermediate between the families of low and high temperature super-conductors (LTS and HTS). In practical applications, super-conductors are permeated by quantised magnetic flux vortices, and when a current flows…
A theory for spin and lattice couplings to the electronic states in high-T$_C$ oxides is presented, with HgBa$_2$CuO$_4$ as an example. A simple analytical model suggests that the barrel band is sensitive to potential perturbations with long-range Fourier components, and that gaps can be opened at the Fermi energy. Th…