Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMean-field theory of block copolymers: bulk melts, surfaces, and thin filmsKenneth R. ShullCite this: Macromolecules 1992, 25, 8, 2122–2133Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/d…
A hypothesis for aging produced by dry band arcing in silicone rubber material used for outdoor insulation is presented and experimentally proven. Aging is indicated by permanent changes. The analytical techniques used to study the permanent changes are Fourier transform infrared (FTIR) spectroscopy, energy dispersive…
The local concentration and distribution of 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) within normal brain tissue were studied following surgical implantation of biodegradable polymer containing BCNU in New Zealand White rabbits. Cylindrical discs of poly(bis(p-carboxyphenoxy)-propane:sebacic acid) copolymer in a 20:…
The results of an analysis of the optical properties of Er/sup 3+/ and (Er/sup 3+/, Yb/sup 3+/) doped Y/sub 2/SiO/sub 5/ single crystals that have been grown by the Czokralski method are presented. These crystals emit a very interesting fluorescence in the eye-safe spectral range around 1550 nm and they can be pumped…
In the conventional rate-theory treatment of irradiation-induced dimensional changes based on the concept of dislocation bias, it is implicitly assumed that interstitials and vacancies are produced continuously and uniformly in the form of Frenkel pairs. This implies that all produced point defects are free and are av…
Model structures of cholesteric liquid crystal droplets embedded in a medium which enforces parallel surface anchoring are treated. Structures with disclination lines of integer and half-integer strength are obtained by minimising the Frank free energy. The constant order parameter approximation appropriate for drople…
The influence of fatigue loading history and microstructural damage on the magnitude of frictional heating and interfacial shear stress in a unidirectional SiC fiber/calcium aluminosilicate matrix composite was investigated. The extent of frictional heating was found to depend upon loading frequency, stress range, and…
Chiral liquid‐crystalline phases are of great interest due to their nonlinear optical and ferroelectric properties. Side‐chain FLCPs (ferroelectric liquid crystal polymers) are known but no main chain FLCPs have been reported, only a limited number of FLC dimers which are used as models for the main chain compounds be…
The reversible bending of bipolymer strips composed of a polymer layer (polyethylene) and a conjugated polymer layer (polypyrrole) due to volume changes in the polypyrrole on chemical or electrochemical doping is demonstrated. Several applications of such bipolymer strips in devices used to convert chemical or electri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChitosan-lipid films: microstructure and surface energyDominic W. S. Wong, Francois A. Gastineau, Kay S. Gregorski, Sandra J. Tillin, and Attila E. PavlathCite this: J. Agric. Food Chem. 1992, 40, 4, 540–544Publication Date (Print):April 1, 1992Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLacunary polyoxometalate anions are .pi.-acceptor ligands. Characterization of some tungstoruthenate(II,III,IV,V) heteropolyanions and their atom-transfer reactivityChaoying Rong and Michael T. PopeCite this: J. Am. Chem. Soc. 1992, 114, 8, 2932–2938Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of block copolymers. 1. Small-angle x-ray scattering study of a .epsilon.-caprolactone-butadiene diblock copolymerShuichi Nojima, Kazunori Kato, Satoru Yamamoto, and Tamaichi AshidaCite this: Macromolecules 1992, 25, 8, 2237–2242Publication Date (Print):April…
The glow discharge plasma deposition (GDPD) of tetraethylene glycol dimethyl ether is introduced as a novel method for obtaining surfaces that are resistant to protein adsorption and cellular attachment. Analysis of films by x-ray photoelectron spectroscopy and several biological assays indicate the formation of a fou…
Abstract Here we introduce an idea for a reciprocal phase shifter using a novel class of material, which we name pseudochiral or ω medium. We describe this complex material electromagnetically by a set of bianisotropic constitutive relations, and present the physical insights into the coupling mechanism exhibited in s…
The solidification of melts can be profoundly influenced by convection. In alloys, compositional convection can be driven by solute gradients generated as one component of the alloy is preferentially incorporated within the solid, even when the thermal field is stabilizing. In this paper, two modes of compositional co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected frequency effects on the rate of oxidative processes induced by ultrasoundChristian Petrier, Andre Jeunet, Jean Louis Luche, and Gilbert ReverdyCite this: J. Am. Chem. Soc. 1992, 114, 8, 3148–3150Publication Date (Print):April 1, 1992Publication History Published…
Tin-doped indium oxide (ITO) films with the resistivity less than 1.35×10−4 Ω cm were formed by low voltage dc magnetron sputtering (LVMS) and highly dense plasma-assisted electron beam (EB) evaporation using the arc plasma generator (HDPE). The structural properties of these films were investigated using x-ray diffra…
First, Monte Carlo modelling of electron-solid interactions is briefly reviewed regarding its historical development, followed by quantification in microbeam analysis with various types of signals generated by electron penetration in solids. Second, typical models stimulated by these improvements are explained by demo…
Gadolinium diethylenetriaminepentaacetic acid (DTPA) covalently linked to the lipophilic ethoxybenzyl moiety (Gd-EOB-DTPA) was designed for use as a contrast agent in hepatobiliary magnetic resonance imaging. With T1 relaxivity values of 8.7 L/mmol.second in plasma and 16.6 L/mmol.second in rat liver tissue and a medi…
We report a computer-simulation study of a system of ``hard cut spheres,'' oblate particles that are obtained by slicing off the top and bottom caps of a sphere at a distance L/2 from the equatorial plane. This system serves as a model for a disklike mesogen. The phase behavior of this system is found to be strongly d…