Materials Literature
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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…
Poly(D,L-lactide-co-1,3-trimethylene carbonate) (PLCA) has been synthesized by ring-opening polymerization of 1,3-trimethylene carbonate (CA) and D,L-lactide (LA) using stannous octoate as catalyst. The copolymers were characterized by 1H nuclear magnetic resonance (NMR), 13C NMR and differential scanning calorimetry.…
The diffraction characteristics of finite-number-of-periods (FNP) gratings are determined by using rigorous electromagnetic analysis based on the two-region formulation of the exact boundary element method. Gratings with 5, 9, 13, and 17 periods are analyzed and compared with infinite-number-of-periods (INP) gratings…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPlastic Superconducting Polymer−NbSe2 NanocompositesHui-Lien Tsai, Jon L. Schindler, Carl R. Kannewurf, and Mercouri G. KanatzidisView Author Information Department of Chemistry and Center for Fundamental Materials Research Michigan State University East Lansing, Michi…
The basis set dependency of Al and Si isotropic chemical shieldings in Al 3+ ·6(H 2 O), [Al(OH) 4 ] 1- ·2(H 2 O), and tetramethylsilane have been calculated using the GIAO formalism. The Si chemical shielding changes substantially with the addition of extra d-functions; however, this influence is smaller than the effe…
Photochemical phase transition behavior of photochromic azobenzene liquid crystals (LCs) was explored by means of reflection-mode analysis. On pulse irradiation at 355 nm, which causes trans − cis isomerization of the azobenzene moiety, these LCs underwent nematic (N) to isotropic (I) phase transition in 100 μs as pro…
Dielectric properties of ceramic samples of Sr 1− x Pb x TiO 3 solid solutions for x varying from 0 to 0.3 have been studied. The ferroelectric phase transition in this system has been established to persist down to x =0.005. Within the x values of 0.002 to 0.05, the ferroelectric transition temperature is shown to fo…