Materials Literature
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Abstract The title compound with an ordered monoclinic (pseudotetragonal) perovskite structure has been prepared. The lattice constants are a=5.5239(5), b=5.5253(4), c=7.8936(6) Å, β=90.16(1)°, and Z=2. The superstructure was found to be due to a layer-like ordering of Na+ and La3+ ions along alternate c-planes as wel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic oxygen isotopic exchange between oxygen molecule and the lattice oxygen of titanium dioxide prepared from titanium hydroxideShinri Sato, Toru Kadowaki, and Keiiti YamagutiCite this: J. Phys. Chem. 1984, 88, 14, 2930–2931Publication Date (Print):July 1, 1984Pub…
Abstract Sodium metatungstate, Na 6 [H 2 W 12 O 40 ] is presented as a new medium for density‐gradient centrifugation. This electrolyte may be used in aqueous, aqueous sodium chloride, or in methanol solutions. The sedimentation behaviour of sodium metatungstate in binary (Na 6 [H 2 W 12 O 40 ]/H 2 O) and in ternary (…
We have quantitatively observed for the first reported time nanosecond-laser-induced optical wave mixing and ultrasonic wave generation in nematic liquid-crystal films. The effect may prove useful for microsecond wave-front conjugation with a moderate-power laser or gigahertz acousto-optic switching.
The problem of bubble-bubble interaction is studied experimentally. The motions of multiple gas bubbles attached to a solid wall by a shock wave are observed by using a high speed camera, and the induced impulsive pressures are measured. On the basis of these results, the effects of number and configuration of gas bub…
The dihydrate of ammonia has been isolated for the first time. Its x-ray powder diffraction pattern can be indexed on a cubic unit cell a=7.118 Å with a 95% confidence limit of 0.015 Å at ∼105 K, and Z=4. The number of diffraction lines, neglect of the hydrogen atoms, and the assumption that the atoms are on sites of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence lifetimes of aqueous europium chloride, nitrate, sulfate, and perchlorate solutions. Studies on the nature of the inner coordination sphere of europium(III) ionFujio Tanaka and Shigeru YamashitaCite this: Inorg. Chem. 1984, 23, 14, 2044–2046Publication Date (Pri…
Single pits were produced in AISI 304 stainless steel using a neutral 1M sodium chloride solution with 0.04M sodium thiosulfate. The dependence of pit growth kinetics on potential was measured electrochemically. The protection potential showed a small scatter for the 80 pits examined and had no systematic dependence o…
A density-functional description of liquid crystals is developed. Formally exact expansions for thermodynamic functions in terms of a direct-correlation function are given. Approximations to the direct-correlation function lead to different versions of the molecular-field theories of liquid crystals. The properties of…
A series of reactive, end-capped, polyimide oligomers has been prepared for possible use as planarizing coatings in the electronics industry. Thus, 1,3-bis(3-aminophenoxy)benzene was treated with various excess amounts of 2,2-bis(3,4-dicarboxyphenyl)hexafluoro-propane dianhydride in m-cresol containing toluene and iso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of aggregates on extinction and surface-enhanced Raman scattering spectra of colloidal silverM. Kerker, O. Siiman, and D. S. WangCite this: J. Phys. Chem. 1984, 88, 15, 3168–3170Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Publish…
Abstract The deformation behavior of three polymers, polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), and linear polyethylene (LPE) is considered in terms of two key factors, the stretching of a molecular network and the influence of thermally activated processes. In PET the observation of a natural dr…
Abstract The balance of impact strength and rigidity of polypropylene can be significantly improved by physical blending of the polypropylene with a talc filler and a variety of elastomer types. Unsaturated elastomers were found to be effective impact strength improvers in 70/15/15 percent PP/elastomer/talc composites…
Abstract A Vilsmeier adduct derived from arylsulfonyl chlorides and DMF in pyridine was successfully used as a new condensating agent for the synthesis of aromatic polyesters by the direct polycondensation of aromatic dicarboxylic acids and bisphenols and also of hydroxybenzoic acids. Polymers of high molecular weight…
Triple lines in polycrystalline aggregates are lines where three grains meet. It is shown that these lines can be interpreted as disclinations if the relations between adjoining grain orientations are chosen as nearest-neighbour relations. These relations are needed for describing quantitatively the structure of the i…
Applicatims a Mo- and W-based heteropoly acids (HPA) as a catalyst in the oxidation of olefins have extensively been investigated1. However, a patent work is only attempted concerning the evoxidatim of olefins with H202 by HPA2) since the oxirane ring is cleaved because of a strong acidity of HPA itself. Herein, an ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility enhancement via ion-dipole interactions. 1. Polystyrene ionomer/poly(alkylene oxide) systemsM. Hara and A. EisenbergCite this: Macromolecules 1984, 17, 7, 1335–1340Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissu…
Abstract The synthesis and phase behaviour of azo dye containing liquid crystalline side group copolymers are described. These Copolymers show the same electro‐optical effects as low molar mass guest‐host systems. Their macroscopic oriented nematic structure can be frozen in below the glass transition temperature resu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution carbon-13 NMR study of silk fibroin in the solid state by the cross-polarization-magic angle spinning method. Conformational characterization of silk I and silk II type forms of Bombyx mori fibroin by the conformation-dependent carbon-13 chemical shiftsHazime…
Insulin adsorption isotherms on various materials have been measured to begin to clarify the role of material surface energy in insulin aggregation. Using 125I-insulin and direct gamma-counting of the exposed material, more insulin (per unit area) was adsorbed to hydrophobic materials (Teflon, Silastic) than to the hy…