Materials Literature
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The C 1s and O 1s core-level photoabsorption spectra of poly[2-methoxy,5-(2′-ethyl- hexoxy)-1,4-phenylene vinylene] (MEH-PPV) before and after exposure O2 and broadband visible light were recorded to determine the degradation pathway for this polymer. The change in the O 1s spectra as a function of exposure demonstrat…
In a series of papers, we have reported the results of dielectric, magnetic and magnetoelectric studies of (R = rare earth between Nd and Lu, Y or Bi), proposing the possibility of ferroelectricity in these oxides, but the direct demonstration of ferroelectricity was lacking. In this paper we present the results of py…
The preoxidation cleaning of silicon carbide surfaces (3C, 4H, 6H polytypes) by exposing them to ultraviolet radiation and oxygen is shown to produce a significant improvement in the electronic properties of SiC/SiO2 interfaces. It is found that this treatment results in a removal of defect species, otherwise present…
We perform long molecular dynamics simulations of liquid water in normal and supercooled states for times up to 50 ns. We observe the onset of a cage effect at 0.25 ps followed by diffusion at much longer time. The diffusion constant has a power-law temperature dependence. The long-time single-particle dynamics of sup…
Magnetoresistance resulting in a drop in resistivity of more than three orders of magnitude that is strongly coupled to lattice striction has been observed under a relatively low magnetic field (0.4 tesla at 115 kelvin) for a single crystal of perovskite-type manganese oxide with finely controlled ionic radii of the A…
Spiders produce a variety of silks that range from Lycra-like elastic fibers to Kevlar-like superfibers. A gene family from the spider Araneus diadematus was found to encode silk-forming proteins (fibroins) with different proportions of amorphous glycine-rich domains and crystal domains built from poly(alanine) and po…
Negative thermal expansion was found for ZrW 2 O 8 from 0.3 kelvin to its decomposition temperature of about 1050 kelvin. Both neutron and x-ray diffraction data were used to solve and refine the structure of this compound at various temperatures. Cubic symmetry persists for ZrW 2 O 8 over its entire stability range.…
The miscibility in the melt and solid state of blends made of poly(p-phenylene sulphide) (PPS) with a liquid crystalline polymer (LCP) from DuPont was studied by polarized light optical microscopy (PLOM) and dynamic thermal mechanical analysis. Both techniques showed that the PPS and the LCP are immiscible in both sta…
The one-pot method polymerization of polyimide was carried out from 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) and 4,4′-oxydianiline (ODA) by the use of p-chloro-phenol as the solvent. The behavior of the polymerization was compared with that of the two-step method. The imidization reaction in the one-pot m…
Oil-containing poly(vinyl alcohol) (PVA) microcapsules in the size range of 5–20 μm were prepared by the simple coacervation of PVA followed by chemical crosslinking of the coacervated PVA membrane with glutaraldehyde. Coacervation of the aqueous polymer solution was achieved by the addition of a phase separation indu…
Two series of samples, one of PET and another of PBT, were received after chain extension at different reaction times with two new chain extenders (diimidodiepoxides). These samples showed different intrinsic viscosity and degree of branching or crosslinking. The effect of this differentiation on thermal properties wa…
The water-soluble solids comprised of the ionic complex between chitosan and acetic acid, chitosonium acetate, are converted into chitin by heating. The thermally-induced conversion of a water-soluble chitosonium acetate in film form into a water-insoluble chitin film was examined by thermal analysis (DMTA, TGA, DSC,…
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…
The series of complexes Ru(( E )-4,4‘-C⋮CC 6 H 4 X CHC 6 H 4 NO 2 )(PR 3 ) 2 (η-C 5 H 5 ) (X = CH, R = Ph, 11a; X = CH, R = Me, 11b; X = N, R = Ph, 12a; X = N, R = Me, 12b ) has been synthesized by reaction of RuCl(PR 3 ) 2 (η-C 5 H 5 ) with ( E )-4,4‘-HC⋮CC 6 H 4 X CHC 6 H 4 NO 2 and deprotonation of the intermediate…
A recent tight-binding scheme provides a method for extending the results of first principles calculations to regimes involving $10^2 - 10^3$ atoms in a unit cell. The method uses an analytic set of two-center, non-orthogonal tight-binding parameters, on-site terms which change with the local environment, and no pair…
The human immunodeficiency virus type 1 (HIV-1) matrix protein forms a structural shell associated with the inner viral membrane and performs other essential functions throughout the viral life cycle. The crystal structure of the HIV-1 matrix protein, determined at 2.3 angstrom resolution, reveals that individual matr…
Abstract. Results of investigation of anodization process in thin-film microelectronic structures are presented. Anodization spectroscopy method, a new high-resolution way of studying films and thin-film structures, is developed for the express-control of superconducting microcircuits technology based on niobium and a…
Abstract The structures of low‐density polyethylene (LDPE) modified by in situ sorption and thermal polymerization of 4‐vinylpyridine (4VP) and of methyl methacrylate (MMA) were studied. The phase behavior of these materials was investigated by means of X‐ray diffraction, scanning electron microscopy (SEM), and by the…
Abstract Thermische Analysen und Röntgenstrukturanalysen zeigen, daß es im Dreistoffsystem Thallium–Indium–Schwefel mit Tl 2 SIn 2 S 3 und TlSInS zwei binäre Schnitte gibt, auf denen ternäre Verbindungen mit eigenständigen Kristallstrukturen liegen. Dies sind die Verbindungen TlIn 5 S 8 , TlIn 3 S 5 , TlInS 2 und Tl…
Abstract Die Darstellung von Rb 2 Ni 3 Se 4 gelang durch Umsetzung von Rubidiumcarbonat, Nickel und Selen in einem Wasserstoffstrom bei 850°C. Die goldfarbig glänzende Verbindung kristallisiert im K 2 Pd 3 S 4 ‐Typ; a = 10,555(3) Å, b = 27,588(6) Å, c = 6,031(6) Å, Z = 8, Fddd (Nr. 70). Die Struktur läßt sich als Stap…