Materials Literature
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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…
Abstract Extensive experimental investigations into the effect of magnesium and sulfate ionic impurities on cooling crystallization of KCl were carried out in a steady‐state Mixed Suspension Mixed Product Removal (MSMPR) crystallizer. The impurities selected for investigation were chosen from those naturally associate…
Small angle X-ray diffraction data from aligned samples of three bicyclohexane compounds in smectic B and nematic phase have been analysed to determine the bond orientational order (BOO), orientational order parameters (OOP), transtational order parameter (TOP), layer thickness (in smectic B phase), apparent molecular…
The flow of an electrically conducting fluid in an open channel in the presence of a strong magnetic field of oblique incidence to both the channel walls and the force of gravity is explored. This type of flow has possible applications to the protection of high heat flux surfaces in magnetic confinement fusion reactor…
Iron spectra were measured with the Physical Electronics Model 5400 x-ray photoelectron spectrometer using unmonochromated Mg Kα x-rays at three pass energy settings corresponding to analyzer energy resolutions of 1.34, 0.54, and 0.13 eV. The specimen is a high purity 0.25 mm thick iron foil that was obtained from Joh…
Full-thickness, circular, cutaneous wounds (4 cm diameter) were created on metacarpi and metatarsi of 5 horses. On day 6, all 4 wounds on each horse received a stored autogenous split-thickness sheet graft. Grafts were obtained from the horse's ventrolateral thorax with a pneumatic dermatome at the time the cutaneous…
Abstract Single crystals of BaCuTeO 3 TeO 4 have been prepared by crystallisation from melts. X-ray investigations lead to orthorhombic symmetry, space group C 16 2v -Ama2, a = 5.4869(8), b = 15.412(1), c = 7.2066(4) Å , Z = 4. This compound represents a new structure type, containing BaO 10 , CuO 5 , TeO 6 and TeO 4…
XPS spectra of Pt black in the as received state showed O and C impurities along with Pt. An in situ treatment by O2 and H2 increased Pt intensity and removed a part of oxygen and carbon impurities. The quasihomogeneous model was used for quantitative evaluation applying atomic sensitivity factors published in the lit…
A molybdenum σ= 5 [001](310) symmetrical tilt boundary has been examined following carburization heat treatments. The resulting structure was studied by 400 kV high-resolution electron microscopy and compared with the structure of the pure boundary. It is shown that two different morphologies and carbide structures ex…
Research efforts conducted in the Chemistry Division of the Oak Ridge National Laboratory on the preparation of polymeric precursors to boron nitride are reviewed. They evolved from the preparation of powders, which contained significant amounts of residual carbon, derived from the pyrolysis of aminoborane polymers to…