Materials Literature
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Exact analytical results are obtained for the flux-pinning-induced magnetostriction in cylindrical type-II superconductors placed in parallel magnetic field. New modes of irreversible deformation are found: In contrast to the circular cylinder where shape is conserved, it is shown that a square cross-section deforms w…
The controlled synthesis of PbSe nanocrystal quantum dots with narrow size distributions was achieved through phase decomposition of the PbSe solid solution in a phosphate glass host. Structural characterization by electron microscopy and x-ray diffraction shows that the dots have mean diameters between 2 and 15 nm. T…
We construct a theory of the dielectric properties of a polymer dispersed liquid crystal droplet film containing bipolar droplets whose principal axes respond to an electric field. The theory involves a balance of an elastic energy term favouring an initial zero-field distribution of droplet axes and a dielectric ener…
This paper presents results of a study of the barrier effect in solid dielectrics in uniform and highly inhomogeneous electric fields. The influences of various factors such as mechanical strain, the position of the barrier in gap, space charge, the permittivity and the conductivity gradient both on the breakdown volt…
Physical properties of mica-reinforced linear (LPB) and star-branched polybutadiene (SPB) composites have been studied with special reference to the effect of silane coupling agent, degree of crosslinking, and degree of mica loading, as well as the molecular architecture of polybutadienes. Tensile properties increase…
The dependence of electrical resistivities on the temperature of different polymer systems (including rubbers and plastic/rubber blends) loaded with carbon blacks (including oxidized and normal carbon blacks) were studied. We found that polymer-carbon black interactions could greatly influence the electrical resistivi…
A new kinetic model was developed to describe the thermal degradation behavior of polymers. The model was applied to predict the degradation of poly(methyl methacrylate) (PMMA) blended with propyl ester phosphazene (FR). The results showed that the thermal degradation mechanism of pure PMMA was dominated by zero- and…
Just as atoms are natural boxes that contain electrons, quantum dots--small structures in which electrons can be trapped--can be studied as artificial atoms. In his Perspective, McEuen discusses results reported in the same issue on new studies of artificial atoms. Kouwenhoven et al. studied the magnetic field depende…
Pa11adinized Pd sheet electrodes were used for improving the catalytic activity for the hydrogenation of2-octene having poor reactivity at a Pd sheet electrodeThe palladiization was carried out chemlcally with active hydrogen which was electrochemicaliy producedfollowed by passing through the Pd sheet dectrodeThe Pd b…
A new family of homogeneous polyolefin polymers that exhibit unique molecular and rheological properties designated polyolefin elastomers (POEs) are characterized by a narrow molecular weight and high degrees of comonomer distribution. Because these copolymers are often elastomeric in nature, one of the uses for these…
We report a first principles theoretical study of the surface relaxation and lattice dynamics of the Cu(211) surface using the plane wave pseudopotential method. We find large atomic relaxations for the first several atomic layers near the step edges on this surface, and a substantial step-induced renormalization of t…
Organically modified aluminosilicate mesostructures were synthesized from two metal alkoxides with the use of poly(isoprene-b-ethyleneoxide) block copolymers (PI-b-PEO) as the structure-directing molecules. By increasing the fraction of the inorganic precursors with respect to the polymer, morphologies expected from t…
We develop an empirical potential for silicon which represents a considerable improvement over existing models in describing local bonding for bulk defects and disordered phases. The model consists of two- and three-body interactions with theoretically motivated functional forms that capture chemical and physical tren…
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…
Article Crystal structure of Ce2O2.5S, an oxidized form of Ce2O2S, from neutron and X-ray powder diffraction was published on December 1, 1997 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 212, issue 1).
A thin-film structure consisting of a ferrite and a high- T c superconductor was used to investigate the effct of the transport current in the superconductor on the amplitude-frequency characteristic and dispersion of surface magnetostatic waves (MSWs) in a ferrite film. It was found that the nature of energy transfer…
The Z-scan technique is used to extract the real and imaginary third order nonlinear susceptibilities, Re<SUB>(chi</SUB> )<SUP>(3</SUP>) and Im<SUB>(chi</SUB> )<SUP>(3</SUP>), respectively. A series of Z scans were conducted at 590 nm (near one-photon resonance) on a cumulene-containing polymer, poly(p- phenylene-1,4-…
The effect of support on the noble metal catalysts for carbon monoxide and hydrocarbon oxidation was investigated. The reactions were performed under the stoichiometric and oxygen-deficient conditions. Under the stoichiometric point, the activities of the powder catalysts for CO and C 3 H 6 oxidation are in the order…
Article Crystal structure of trisodium dineodymium nonanitrate,Na3[Nd2(NO3)9] was published on December 1, 1997 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 212, issue 1).
A polystyrene–polyisoprene (PS–PI) diblock copolymer (10,000–50,000 g/mol) and a matched PS&ndashPI–PS triblock (10,000–100,000–10,000 g/mol) were employed to study the effect of chain architecture on the rheological response of ordered block copolymer melts. Both samples adopt hexagonal microstructures with PS cylind…