Materials Literature
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The scenarios of the size effects which may account for the difference in the switching properties of ferroelectric thin films and bulk ferroelectrics are critically reviewed. It is shown that the two often used models (the Janovec-Kay-Dunn surface nucleation size effect and the dielectric layer model) are irrelevant…
The effect of rice husk ash (WRHA) as a filler in epoxidized natural rubber compounds has been studied. The mechanical properties viz tensile and tear strength were enhanced by the addition of WRHA. The optimum level of WRHA to obtain maximum mechanical properties was achieved at 20 phr after which there was deteriora…
The structure, thermal stability, and catalytic behavior of a novel highly dispersed silica-supported Pd/Sn catalyst prepared by an organometallic route have been examined by X-ray photoelectron, X-ray diffraction, and X-ray absorption, fine structure spectroscopies, the latter two measurements being carried out with…
Three kinds of 2 H-labeled Bombyx mori silk fibroin samples (with [2,2- 2 H 2 ]Gly, [3,3,3- 2 H 3 ]Ala, or [2,3,5,6- 2 H 4 ]Tyr) were obtained by oral administration of either the labeled amino acid or 2 H 2 O to 5th instar larvae. The administration of 2 H 2 O alone yielded a high degree of selective deuteration at t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Poly(tetramethyl-m-silphenylenesiloxane), an Elastomer of Enhanced High-Temperature StabilityRuzhi Zhang, Allan R. Pinhas, and James E. MarkView Author Information Department of Chemistry and the Polymer Research Center, University of Cincinnati, Cincinnati, Ohio 4…
This paper describes results of an experimental investigation into surface discharges occurring on the surface of polymeric insulators. Discharges on partially hydrophobic surfaces were found to occur across well defined dry bands, while discharges on hydrophobic surfaces appeared as small points of light occurring be…
Abstract A model for the heterogeneous oxidation of polypropylene (PP) is proposed in which it is considered that there is a small initial fraction, p o , of oxidizing centres which have a high local rate of oxidation. Within these zones there is a free radical chain reaction producing secondary oxidation products, vo…
Optical pulse width measurements of sonoluminescence from cavitation-bubble fields have been obtained for two well-defined cavitation zones in an aqueous solution of Glycerin using a fast (650 ps rise-time) PMT and a fast (10 GS/S) digitizer. One zone corresponds to cavitation produced from an ultrasonic homogenizer.…
This contribution presents a quantum chemical investigation of the nonlinear optical response of charged centrosymmetric aggregates of the archetypical chromophore p -nitroaniline using an ab initio supermolecular approach. Localized hole states, responsible for aggregate nonlinearity, are predicted to be more stable…
A study of the effects of coating thickness of room temperature vulcanizing (RTV) silicone rubber on its electrical performance in salt-fog of 250 /spl mu/S/cm and 1000 /spl mu/S/cm at 0.5 kV/sub rms//cm is presented. Porcelain rods coated with RTV silicone rubber to a thickness from 0.17 to 0.99 mm were studied. The…
We derive from the self-consistent field equations the classical theory of polymer brushes. It results from ignoring, for each position of the polymer end-point, all but the most probable configuration. Results for the brush density profile and polymer end distribution depend sensitively on the square of the ratio of…
The temporal deposition of selected complement proteins from human serum onto immobilized human colostrum immunoglobulin (Ig)A and human IgG on hydrophobic silicon was studied by ellipsometry-antibody techniques after incubations at 37 degrees C for up to 1 h. In parallel experiments the serum soluble iC3b, C4d, and B…
Crystal and electronic structures and physical properties of the molecular conductors Me4Z [Pd(L)2]2 (Z = N, P, As, and Sb; L = dmit and dmise) are described. Every salt has very similar crystal structure with “solid-crossing” columns. The behavior of resistivity under pressure depends on the Se-substitution and the c…
A diffuse-interface kinetic field model for describing grain boundary motion is proposed. It is based on the time-dependent Ginzburg-Landau equations, in which grain orientations are described by non-conserved order parameters. A simple example, a two-dimensional circular grain boundary with isotropic grain boundary e…
By carefully controling the nanocrystallite surface passivation, it is possible to make light-emitting porous silicon essentially inert and to stabilize its photoluminescence. Using this material, which we call silicon-rich silicon oxide (SRSO), stable and efficient porous silicon light-emitting devices (LEDs) emittin…
We report electroabsorption measurements of the built-in electrostatic potential in metal/C60-doped polymer/metal structures to investigate chemical potential pinning due to equilibrium electron transfer from a metal contact to the electron acceptor energy level of C60 molecules in the polymer film. The built-in poten…
Morphology changes in etch pits formed on the (10 1 4) cleavage plane of calcite were induced by varying the ratio of [Ca 2+ ] to [CO 3 2 - ] in the bulk solution as well as through the addition of the crystal poison 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP). Three distinct morphologies were noted: symmetric rh…
The high photosensitivity of titaniumoxo phthalocyanines makes them suitable for application as charge generation materials, e.g., in photocopiers. The synthesis, photophysical, and photochemical properties of soluble titaniumoxo phthalocyanines containing alkyl and alkoxy substitutents (see Figure) in the periphery o…
Temperature and bias-field dependences of dielectric behaviour in the antiferroelectric liquid crystal, R-MHPOBC, were investigated (see also previous paper). There are mainly two relaxation modes in the SmC*alpha and SmC* phases: one behaves as the soft-mode, which shows significant slowing down in the SmA* and SmC*a…
Ferroelectric memory devices are subject to failure due to both a simple loss of retention or due to imprint. The difference between retention and imprint as described here depends on the test history of the device. A pulsed capacitor test has been devised to simulate the signal available to a typical memory cell afte…