Synthesis and Properties of Boron Nitride
Coverage includes: thin films; semiconductors; gallium arsenide; friction-reducing coatings; and tribological properties.
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Synthesis of Solid, Spherical Zirconia Particles by Spray Pyrolysis
A model is used to predict solid particle formation during spray pyrolysis by correlating droplet shrinkage before salt precipitation with its relative solution saturation. For the rapid drying conditions and droplet size of ∼ 10 μm, which are characteristic of conventional spray pyrolysis, solid salt particles are fo…
Axisymmetric creeping motion of drops through circular tubes
The axisymmetric creeping motion of a neutrally buoyant deformable drop flowing through a circular tube is analysed with a boundary integral equation method. The fluids are immiscible, incompressible, and the bulk flow rate is constant. The drop to suspending fluid viscosity ratio is arbitrary and the drop radius vari…
Three coordinate phosphorus and boron as π-donor and π-acceptor moieties respectively, in conjugated organic molecules for nonlinear optics: crystal and molecular structures of E-Ph–CHCH–B(mes) 2 , E-4-MeO–C 6 H 4 –CHCH-B(mes) 2 , and E-Ph 2 P–CHCH–B(mes) 2 [mes = 2,4,6-Me 3 C 6 H 2 ]
Hydroboration of π-donor substituted alkynes D–CC–H [D = Ph2P, 4-X–C6H4-(X = H, MeS, MeO, H2N), and (η5-C5H5)Fe(η5-C5H4-)] with dimesitylborane {[(mes)2BH]2, mes = 2,4,6-Me3C6H2} yields air-stable ‘push–pull’E-alkenes of the form E-D–CHCH–B(mes)2, which possess large molecular hyperpolarizabilities, β, as shown by ele…
Solvent- and mechanical-treatment-induced conformational transition of silk fibroins studies by high-resolution solid-state carbon-13 NMR spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent- and mechanical-treatment-induced conformational transition of silk fibroins studies by high-resolution solid-state carbon-13 NMR spectroscopyMika Ishida, Tetsuo Asakura, Motoko Yokoi, and Hazime SaitoCite this: Macromolecules 1990, 23, 1, 88–94Publication Date (Prin…
Photochemically induced isothermal phase transition in polymer liquid crystals with mesogenic phenyl benzoate side chains. 2. Photochemically induced isothermal phase transition behaviors
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemically induced isothermal phase transition in polymer liquid crystals with mesogenic phenyl benzoate side chains. 2. Photochemically induced isothermal phase transition behaviorsTomiki Ikeda, Shin Horiuchi, Durga B. Karanjit, Seiji Kurihara, and Shigeo TazukeCite th…
Recent development status of functionally gradient materials.
Recently, spaceplanes such as "Orient Express" projected by the United States are attracting attention as new space transportation media. In Japan also, the study for developing spaceplanes is recognized as one of the most influential programs among the various research and development projects.In the development of t…
A computer simulation study of the defect structure of calcia-stabilized zirconia
The defect structure of calcia-stabilized zirconia, a topic of long-standing controversy, has been examined by atomistic computer simulation techniques. Defect association energies for an anion vacancy and a dopant calcium ion at both nearest-neighbour and next-nearest-neighbour (NNN) positions have been determined an…
Osmium tetraoxide catalyzed vicinal hydroxylation of higher olefins by using hexacyanoferrate(III) ion as a cooxidant
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOsmium tetraoxide catalyzed vicinal hydroxylation of higher olefins by using hexacyanoferrate(III) ion as a cooxidantMakoto Minato, Keiji Yamamoto, and Jiro TsujiCite this: J. Org. Chem. 1990, 55, 2, 766–768Publication Date (Print):January 1, 1990Publication History Publishe…
Thermodynamics and kinetics of grafting end-functionalized polymers to an interface
We present a theoretical study of the thermodynamics and of the kinetics of grafting end-functionalized polymers to an interface. The equilibrium surface coverage and thickness of the grafted layer are predicted as a function of molecular parameters such as the molecular weight of the chains, the solution concentratio…
Electrochemical Behavior of Aluminum‐Base Intermetallics Containing Iron
The effect of components Fe, Mn, and Si on the electrochemical behavior of phases Al 3 Fe , αAl (Fe, Mn)Si, and δ AlFeSi were investigated in NaOH solutions. Anodic polarization of the phases leads, under certain conditions, to an enrichment of the surface with the more noble components. Enrichment with Fe is detrimen…
Colorimetric Determination of Hydroxyproline as Measure of Collagen Content in Meat and Meat Products: NMKL Collaborative Study
A colorimetric method for the determination of hydroxyproline as a measure of collagen in meat and meat products has been collaboratively studied in 18 laboratories. The method includes hydrolysis with sulfuric acid, oxidation with chloramine-T, and formation of a reddish purple complex with 4-dimethylaminobenzaldehyd…
Liquid Crystalline Polymers
The 2006 edition of this authoritative guide on liquid crystalline polymer (LCP) science was produced in response to the wealth of new material generated in the field. It takes the reader through the theoretical underpinnings to real-world applications of LCP technology in a logical, well-integrated manner. A chapter…
Morphological influence of functionalized and non-functionalized α,ω-dicarboxylates on calcite crystallization
The influence of a range of α,ω-dicarboxylates on the morphology of calcite crystals grown from supersaturated bicarbonate solutions was studied by optical and scanning electron microscopy. At Ca/malonate ≈ 3, spindle-shaped crystals elongated along the c axis and with curved {1text-decoration:overline10} prismatic fa…
Water treeing in polyethylene cables
Water tree growth in polyethylene cable insulation is discussed. The characteristics of water trees, the effect of aging parameters on water tree growth, and the possible mechanisms of growth are considered, emphasizing vented tree development in polyethylene insulating materials. The morphology of water trees, the ch…
Rare‐Earth Aluminosilicate Glasses
Rare‐earth aluminosilicate glasses of the general formula 20R 2 O 3 · 20Al 2 O 3 · 60SiO 2 have been formed for 10 of the 14 possible rare‐earth oxides. Two series of “mixed‐rare‐earth” glasses were also formed (Nd/Er and Nd/Y). These glasses exhibit exceptionally high glass transformation temperatures, moderate therm…
Theory and design of the liquid crystal TV as an optical spatial phase modulator
An expression is derived for the complex amplitude transmittance of the liquid crystal TV (LCTV) and verified experimentally. It is shown that spatial phase modulation is realizable with good linearity, high transmission efficiency, and small intensity distortion. Although the commercial LCTV does not provide a suffic…
Discotic liquid crystals
Recent studies have established that many compounds composed of disc-shaped molecules exhibit stable thermotropic liquid crystalline phases. They are now referred to as discotic liquid crystals. Structurally, most of them fall into two distinct categories, the columnar and the nematic. The columnar phase, in its simpl…
Universal Form of the Low-Energy (2 to 10 meV) Vibrational Spectrum of Glasses
By means of inelastic cold neutron scattering the density of vibrational states (DVS) has been determined for a series of vitreous materials: SiO 2 , As 2 S 3 and metallic glass Mg 70 Zn 30 . In the low-energy range of the spectrum ( E ∼ (2 ÷ 10) meV) for these materials DVS reveals a universal, but non-Debye form. Th…
Molecular Orientational Structures in Ferroelectric, Ferrielectric and Antiferroelectric Smectic Liquid Crystal Phases as Studied by Conoscope Observation
Molecular orientational structures in MHPOBC were studied by means of conoscope observation. Contrary to a ferroelectric response of the conoscope to an electric field in the smectic C * phase, the conoscopic figure in the antiferroelectric smectic C A * phase does not shift its center and is biaxial with its optic pl…