Materials Literature
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Abstract X‐ray diffraction, differential scanning calorimetry and NMR have been used to give information on the molecular order and melting of tripalmitin and tristearin crystals. They also have been used to study the melting and solubility of these pure triglycerides when mixed with triolein. From these studies we pr…
Abstract Several series of thermotropic liquid‐crystalline polyesters, based on 4‐chlorocarbonyl phenyl esters of aromatic dicarboxylic acids ( 1–4 ) and phenols or aliphatic diols, were synthesized and studied by polarizing microscopy and differential scanning calorimetry (DSC). A relationship between geometry of mes…
Combining the quantum chemical valence effective Hamiltonian (VEH) technique and crystal packing methods, we have investigated the electronic properties and crystal structure of poly(perinaphthalene), PPN. The goal is to understand the origin of high conductivities observed for a pyrolysis product which contains PPN c…
Abstract Hexacyanobutadiene(HCBD) forms two kinds of molecular complexes with tetramethyltetrathiafulvalene(TMTTF) one kind with tetramethylthiotetrathiafulvalene(TTMTTF). The crystal structures of these complexes and neutral TTMTTF are determined by X-ray analyses. (TMTTF)2·HCBD is composed of 2:1 donor and acceptor,…
Liquid crystals as nonlinear optical materials are reviewed. Potential applications of these materials in wave mixing, phase conjugation, and optical bistability are discussed. The extremely large optical nonlinearity and the slow response time of these materials make them unique for studies of some highly nonlinear o…
Several unusual microstructural features, i.e., 90° tetragonal ZrO 2 twins containing antiphase domain boundaries, tetragonal ZrO 2 precipitates in a colony morphology, and precipitate‐free zones at the perimeter of cubic ZrO 2 grains containing fine tetragonal ZrO 2 precipitates, were observed in a single ZrO 2 ‐12 w…
Abstract A method is proposed to determine the number of nearest coordination spheres in which the presence of limiting short‐range order is sufficient to produce long‐range order. The use of the method is considered with reference to the example of atomic ordering in solid solutions with b.c.c. and f.c.c. structures.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of linear polyethylene at elevated pressuresH. T. Tseng and Paul J. PhillipsCite this: Macromolecules 1985, 18, 8, 1565–1571Publication Date (Print):August 1, 1985Publication History Published online1 May 2002Published inissue 1 August 1985https://pu…
This investigation studied the antiviral activity of, and the utilization of viruses as substrates by, bacteria. Reovirus type 3 and bacterial species representative of those endemic to sewage, aquatic, and terrestrial habitats were used in the model systems. Culture supernatants from Bacillus subtilis maintained for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid chromatographic determination of low molecular weight alkylthiols in air via derivatization with 7-chloro-4-nitro-2,1,3-benzoxadiazoleYoshinori. Nishikawa and Kazuhiro. KuwataCite this: Anal. Chem. 1985, 57, 9, 1864–1868Publication Date (Print):August 1, 1985Publicati…
Discrepancies between two sets of published values for the optical constants of Ag and Au result in different values for the enhancement of Raman signals from molecules adsorbed on the surface of colloidal spheres. The effect is greatest for small Ag spheres in water with 382-nm irradiation where the dipolar surface p…
Besides Cu40 and CusO reported previously, a third metastable copper oxide with the chemical composition Cu640 formed in the early stage of oxidation of copper has been observed by high-resolution electron microscopy. The atomic positions of Cu and O have been determined by electron diffraction and by comparison of th…
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Five G. barbadense species obtained from Egypt (Dendara, and Gizas 75, 76, 77, and 80), one American G. barbadense cotton (Pima S-5), and one American G. hirsutum cotton (Deltapine Smooth Leaf) were studied. Mercerization appeared to decrease the crystallinity of the G. hirsutum cotton more than that of the G. barbade…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirected charge transfer. Reductive quenching in a chromophore-quencher complexT. David Westmoreland, Kirk S. Schanze, Paul E. Neveux Jr., Earl Danielson, B. Patrick Sullivan, Pingyun Chen, and Thomas J. MeyerCite this: Inorg. Chem. 1985, 24, 17, 2596–2597Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCholesterization of a biaxial nematic lyomesophase studied by x-ray diffraction and optical microscopyA. M. Figueiredo Neto, Y. Galerne, and L. LiebertCite this: J. Phys. Chem. 1985, 89, 18, 3939–3941Publication Date (Print):August 1, 1985Publication History Published online…
Abstract Theoretical and experimental studies have been conducted on the mass transfer rates which occur during the continuous devolatilization of bubble‐free polymeric solutions in a corotating twin‐screw extruder. Experimental measurements of the mass transfer rates, when reported in terms of the product of the indi…
Intense charge-transfer absorptions at wavelengths up to the near-infrared region (700–950 nm) are exhibited by binuclear complexes such as 1 and 2, which contain the low-spin d6 metal-complex fragments Mo(CO)4, W(CO)4, Mn(CO)3Br, and [Ru(bpy)2]2⊕. This is due to very low lying π-acceptor levels of the heteroarene lig…
The physicochemical properties of a clay from La Baie, Quebec were found to be typical of Champlain quick clays: very low plasticity, liquidity index greater than 3, sensitivity greater than 500, and pH of about 9.5. The mineralogy is characterized by the abundance of primary or "rock flour" minerals such as feldspar,…
Silver borate Basses containing 0 to 30 mol% Ag 2 O were formed. Properties measured include density, thermal expansion coefficient, glass transformation and dilatometric softening temperatures, transformation‐range viscosity, dc electrical conductivity, and helium permeability and diffusivity. Optical spectroscopy re…