Materials Literature
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A study of four Gd samples of different purities using ac susceptibility, magnetization, heat capacity, and direct measurements of the magnetocaloric effect in quasistatic and pulse magnetic fields revealed that all techniques yield the same value of the zero-field Curie temperature of 294(1) K. The Curie temperature…
A new method for exact analytical calculation of the accessible surface areas and their gradients with respect to atomic coordinates is described. The new surface routine, GETAREA, finds solvent-exposed vertices of intersecting atoms, and thereby avoids calculating buried vertices which are not needed to determine the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Properties of Polyoxometalates as ElectrocatalystsMasahiro Sadakane and Eberhard SteckhanView Author Information Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, Gerhard-Domagk-Strasse 1, D-53121, Bonn, Germany Cite this: Chem. Rev. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalates in MedicineJeffrey T. Rhule, Craig L. Hill, Deborah A. Judd, and Raymond F. SchinaziView Author Information Department of Chemistry, Emory University, Atlanta, Georgia 30322 Veterans Affairs Medical Center, and Laboratory of Biochemical Pharmacology, Departm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis by Heteropoly Acids and Multicomponent Polyoxometalates in Liquid-Phase ReactionsIvan V. KozhevnikovView Author Information Leverhulme Centre for Innovative Catalysis, Department of Chemistry, The University of Liverpool, Liverpool L69 7ZD, UK Cite this: Chem. Rev.…
Nonisothermal melt crystallization kinetics of PEDEKmK linked by meta-phenyl and biphenyl was investigated by differential scanning calorimetry (DSC). A convenient and reasonable kinetic approach was used to describe the nonisothermal melt crystallization behavior, and its applicability was verified when the modified…
Irradiation of porous (with porosity in excess of 70%) silicon target with femtosecond laser pulses of 10 16 W cm -2 intensity increased by a factor of 3.5 the efficiency of generation of hard x-ray radiation with photon energies E > 8 keV. The increase was 30-fold for E > 2.5 keV. The relationship between this effect…
Gas sorption and transport properties at 35°C have been reported for a series of UV-irradiated films of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO). UV irradiation induced crosslinking in all films. The gas permeability was reduced upon crosslinking while significant increases in gas permselectivity were observed. Th…
Termination structures of surfaces of zeolite L crystals are studied by high-resolution electron microscopy (HREM). By comparing observed HREM images with simulated ones based on some ideal models of the surface structure, a reliable surface structure model is proposed. The framework of the structural model is termina…
Micellar ordering in semidilute solutions of polystyrene−polyisoprene diblock and triblock copolymers in the slightly selective solvent di- n -butyl phthalate has been studied using rheology and small-angle X-ray scattering (SAXS). Ordering as a function of temperature has been investigated for a range of polymer conc…
Three-dimensional cyanide-bridged bimetallic assemblies [Ni(L) 2 ] 3 [Fe II (CN) 6 ]X 2 ((L, X) = (ethylenediamine (en), PF 6 - ) ( 1 ), (trimethylenediamine (tn), PF 6 - ) ( 2 ), (tn, ClO 4 - ) ( 3 )) were synthesized and structurally characterized. Compounds 1 − 3 crystallize in the trigonal system of the space grou…
Poly(ether ketone ketone)s were prepared and used to improve the brittleness of the bismaleimide resin. The bismaleimide resin was composed of 4,4′-bismaleimidediphenyl methane (BMI) and o,o′-diallyl bisphenol A (DBA). Poly(ether ketone ketone)s include poly(phthaloyl diphenyl ether) (PPDE), poly(phthaloyl diphenyl et…
Dielectric spectroscopy of polarization phenomena and electromigration kinetics is fraught with discrepancies. The removal of these discrepancies and the generalization of the available data using the theoretical models introduced here allow the basic features of proton relaxation to be revealed. The features of proto…
Data on hydrogenation of mechanical alloys and intermetallic compounds formed in the course of mechanical alloying and mechanical milling are generalised. It is shown that mechanochemical methods make it possible to solve a number of problems arising in the hydrogenation of metals and alloys and to synthesise novel hy…
A new model is presented for the numerical calculation of pressure fields in liquids with an inhomogeneous distribution of cavitation bubbles. To calculate the pressure field in a homogeneous single-phase fluid, the Helmholtz integral and the Kirchhoff integral are solved numerically. The Helmholtz integral equation a…
The influence of the terminal segment of hydrophobically modified ethoxylated urethane (HEUR) on the linear mechanical behavior is examined through the synthesis of perfluoroalkyl telechelic HEUR (defined as F-HEUR). A series of perfluoroalkyl-modified poly(oxyethylene) (POE) of molecular weight M n = 6000, 10 000, an…
We present the results of some film simulations of polyethylene (PE) on a coarse-grained lattice, which is termed as the second nearest neighbor diamond (2nnd) lattice. Monte Carlo simulations of PE melts have been performed on the 2nnd lattice by including short- and long-range interactions. Films can be obtained fro…
Three compounds of general formula (NBu 4 )[M II Ru III (ox) 3 ] have been synthesized; NBu 4 + stands for tetra- n -butylammonium, M for Mn, Fe, and Cu, and ox 2 - for the oxalate dianion. The X-ray powder patterns for the three derivatives have revealed that these compounds are isostructural with (NBu 4 )[Mn II Cr I…
The intramolecular cyclization of α-carboxyl, ω-amino heterodifunctional polystyrene was carried out to obtain cyclic polystyrene having an amide moiety in the main chain. The amide moiety was reduced with lithium aluminum hydride to give macrocyclic amine. The reactions of the macrocyclic amine with carboxylic-termin…
Two dicarboxylic acids were prepared by alkylation of 4-hydroxycinammic acid with 1,6-dibromohexane or 1,12-dibromododecane. The dichlorides of these dicarboxylic acids were polycondensed with mixtures of isosorbide and methylhydroquinone. All copolyesters then obtained showed nematic schlieren textures. Furthermore,…