Materials Literature
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Experimental and theoretical cross-section data for electron impact ionization of atoms and ions from fluorine to nickel has been assessed and earlier recommendations for light atoms and ions have been revised. Based on this assessment and, in the absence of any data, on the classical scaling laws a recommended cross…
The static dipole polarizability and second hyperpolarizability tensors are calculated for polyene systems via ab initio coupled-perturbed Hartree–Fock theory. The effect of basis set augmentation on the calculated properties is explored for C4H6 and example basis sets are used to calculate the polarizability and seco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen peroxide oxidation catalyzed by heteropoly acids combined with cetylpyridinium chloride. Epoxidation of olefins and allylic alcohols, ketonization of alcohols and diols, and oxidative cleavage of 1,2-diols and olefinsYasutaka Ishii, Kazumasa Yamawaki, Toshikazu Ura,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdditive and nonadditive surface tension components and the interpretation of contact anglesC. J. Van Oss, R. J. Good, and M. K. ChaudhuryCite this: Langmuir 1988, 4, 4, 884–891Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published iniss…
Self-localized nonlinear excitations (solitons, polarons, and bipolarons) are fundamental and inherent features of quasi-one-dimensional conducting polymers. Their signatures are evident in many aspects of the physical and chemical properties of this growing class of novel materials. As a result, these polymers repres…
A simple model for the liquid glass transition is solved numerically. Results for ideal and non-ideal transitions are compared. The data show two or three different scaling regions for the density correlation function or the corresponding susceptibility spectra in agreement with previous analytical results.
to Thermal Analysis Techniques and Applications Edited by Michael E. Brown Chemistry Department, Rhodes University, Grahamstown, South Africa KLUWER ACADEMIC PUBLISHERS NEW YORK, BOSTON, DORDRECHT, LONDON, MOSCOW eBook ISBN: 0-306-48404-8 Print ISBN: 1-4020-0472-9 ©2004 Kluwer Academic Publishers New York, Boston, Dor…
The application of Raman spectroscopy to the analysis of dielectric films with respect to phase composition and homogeneity has been reported during the past several years. Interfacial strain at the film-substrate interface, which influences chemical bonding, also perturbs the vibrational spectrum and can be quantifie…
An analytical solution for the focal spot temperature is developed for the case of an exponential decay of the electron flux in the anode. The influence of volume heating on the surface temperature is dominated by the parameter (w/δ)2 where w is the focal spot width and δ is a mean depth of penetration. Fo…
Diffuse neutron-scattering experiments on the martensitic fcc-hcp phase transition in single crystals of pure cobalt and Co-32% Ni reveal the presence of satellites around (111) fcc reflections within a temperature range where the fcc and hcp phases coexist. The satellites indicate a modulation of the (111) fcc lattic…
We report the first observation of the photoinduced absorption spectrum of the emeraldine base form of polyaniline. The spectrum contains both subgap photoinduced bleaching at 1.8 eV and photoinduced absorptions at 0.9, 1.4, and 3.0 eV, as well as band-edge bleaching above 3.5 eV. The existence of the subgap bleaching…
A theory of self-diffusion in concentrated dispersions is presented, in which the effects of hydrodynamic and direct interactions between macroparticles are virtually decoupled. The long-time self-diffusion coefficient ${D}_{s}^{L}$ is written in terms of the radial distribution function of the suspended particles and…
The native oxides formed on air exposed, etched bulk polycrystalline Zn3P2 were investigated in the as-etched condition, using x-ray photoemission spectroscopy. The sputter-etched surfaces appeared to be composed primarily of ZnO with a small concentration of P2O3 or phosphate underneath. The bromine-methanol etched s…
A detailed study is presented of the optical transmission through quasi-periodically layered media using a transfer matrix technique. The overall behaviour in multilayers arranged according to the Thue-Morse and Fibonacci sequences is found to be very similar. This is in strong contrast to the marked difference recent…
Miscibility in systems containing poly-2,2( m-phenylene)5,5'-bibenzimidazole (PBI) and a variety of aromatic polyimides (PI) has recently been reported.'-3 To study the intermolecular interactions in these blends, mixtures of benzimidazole (BI) and other similar aromatic compounds with PI in the polyamicacid (PAA) for…
Three sizes of CdSe molecular clusters were studied by $^{77}\mathrm{Se}$ NMR spectroscopy. The clusters are synthesized via arrested precipitation in a structured medium and are isolated as a molecular solid after modification of their surfaces with covalently attached organic ligands. While one component of the broa…
We present an approach for aggregating Penrose tiles to form a defect-free, 2D pentagonal quasicrystal tiling. Contrary to conventional wisdom, defect-free quasiperiodic tilings can be constructed by use of local rules alone. The results provide new insights as to how materials with only short-range atomic interaction…
Reduction in the activity and the concentration of the adsorbed enzyme are noted in the experimental data. Two alternative mechanisms, inactivation of the adsorbed enzyme and mass transfer of the enzyme from the bulk solution to the solution within the cellulose fibril where the cellulase is assumed to be inactive, ar…
The isothermal phase changes and associated structural features of a long period superstructure of Cu3Au II in a Au-55.2 at% Cu-17.4 ag% Ag alloy are studied by means of X-ray powder diffraction and electron microscopy. A characteristic long period antiphase boundary structure of the Cu3Au II is only induced within a…
Second state AgxNbS2 occurs in two different modifications, 6RAgxNbS2 and 4HAgxNbS2, both built of sandwiches, NbS2, with the niobium atoms in trigonal-prismatic coordination by sulfur atoms, and with the gaps between sandwiches NbS2 alternately empty and occupied by silver. 6R-AgxNbS2 (0.22 ≦ x ≦ 0.30) of which the…