Materials Literature
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Computer simulations are made of polarizing microscope textures of supramicron-sized nematic droplets with director configurations which commonly occur in polymer and other dispersions. The simulations are computed from polarization rotations and phase shifts caused by nonuniform optical anisotropies of the nematic st…
XPS techniques are used to study the effects of Al Kα x-rays on the surface chemical composition of CeO2. We find that prolonged exposures cause the formation of some Ce3+ oxidic species at the surface. We have studied the Ce 3p, Ce 3d, O 1s, Ce 4p, Ce 4d, and valence band regions in an attempt to localize the depth o…
X‐ray photoelectron spectroscopy (XPS) has often played the major role in the chemical characterization of select surface species, but the extension of that role to larger classes of compounds has generally been limited by such problems as cleanliness, charging, and relaxation shifts. In this article we suggest that a…
The frozen phonon technique is introduced as a means of including the effects of thermal vibrations in multislice calculations of CBED patterns. This technique produces a thermal diffuse background, Kikuchi bands and a Debye–Waller factor, all of which are neglected in the standard multislice calculation. The frozen p…
The kinetics and mechanism of the sonochemical reactions of p-nitrophenol have been investigated in oxygenated aqueous solutions. In the presence of ultrasound (20 kHz, 84 W) p-nitrophenol was degraded primarily by denitration to yield NO_2^-, NO_3^-, benzoquinone, hydroquinone, 4-nitrocatechol, formate, and oxalate.…
The important role of deformation twinning in plastic deformation of h.c.p. metals and alloys is emphasized and the twin nucleation mechanisms are examined. A bifurcated homogeneous nucleation model is presented on the basis of the classical nucleation theory, the shape bifurcation theory and the elastic inclusion mod…
Abstract This article summarizes the detailed equations for the time‐dependent Hartree–Fock treatment of nonlinear properties for perturbations made up of a static electric field and an oscillating field. Explicit expressions for all nonlinear processes up to third order are obtained in terms of the density matrices a…
Abstract XPS spectra of nine model polymers containing oxygen functional groups are studied. The measured O 1s binding energies were 532.8 eV for ether and alcohol oxgens, 532.2 eV for ketone oxygens and 532.2 and 533.7 eV for the carbonyl‐ and ether‐type oxygens in ester groups, respectively. Comparison with previous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColloid stabilization with grafted polyelectrolytesPhilip PincusCite this: Macromolecules 1991, 24, 10, 2912–2919Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/ma00010a043https://…
The present state of the problem of the strong interaction of a metal with the carrier is analysed and the main causes responsible for the appearance of this effect are considered. Data demonstrating the influence of the strong interaction of a metal with the carrier on the absorption and catalytic properties of depos…
We present the first analysis of high-resolution x-ray-diffraction spectra of finite-size Thue-Morse GaAs-AlAs superlattice heterostructures, which show essential properties of singular continuous measures. The implications for future investigations of disordered systems are considered.
The elastic strain in Al-0.5% Cu metal lines under silicon nitride passivation has been determined by x-ray diffraction. The experimental stress tensor calculated from these strain values is in excellent agreement with the results of a finite element model calculation. The intrinsic stress in the dielectric plays no r…
We have measured the electron energy-loss spectrum (EELS) of BC3 at sub-eV resolution. Important differences between the total density of states of BC3 at the threshold of the K edge, predicted by earlier ab initio calculations, have been observed. We conclude from our measurements that the atomic arrangement in these…
The electronic structures of clean InAs(100) surfaces have been investigated by in situ high-resolution electron-energy-loss spectroscopy. Intrinsic electron accumulation layers with carrier densities strongly depending on the surface reconstruction are formed on both As-stabilized and In-stabilized surfaces. The corr…
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…
Absorption spectra of GaAs/GaAlAs Fibonacci superlattices (FSL) with magnetic fields parallel to the layers show self-similarity at field values scaled by ${\mathrm{\ensuremath{\tau}}}^{2}$ [\ensuremath{\tau}=(1+ \ensuremath{\surd}5 )/2]. The one-dimensional nonperiodicity of the FSL affects the carrier motion perpend…
${\mathrm{Ga}}_{0.5}$${\mathrm{In}}_{0.5}$P alloys order spontaneously during growth into a (111) monolayer superlattice despite the fact that this is not the lowest-energy structure of the three-dimensional bulk compound. Using first-principles total-energy calculations, we show that a novel electronically driven sur…
An electro-optic (EO) polymer-based integrated optic Mach–Zehnder modulator with a measured frequency response up to 20 GHz is reported. The device was fabricated with an EO polymer supplied by Akzo Research, bv, and utilized 50 Ω microstrip drive electrodes. A half-wave voltage of Vπ=9 V and a modulation depth of 90%…
We have studied the adsorption of cyclohexane and water on molecularly smooth mica using an angle-averaging, refractive-index-matching ellipsometric technique. The isotherms are linear for submonolayer coverages, showing the importance of entropy effects, and give finite thicknesses (\ensuremath{\approxeq}2 nm) at sat…
Abstract Bitumen from thermal recovery processes is produced mainly in the form of water-in-oil emulsions. Generally, it has been believed that these emulsions form al restrictions in and around the wellbore, and/or in the surface sampling ports, but not in the reservoir. Thus, it has been assumed to be appropriate to…