Materials Literature
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Chirality has become arguably the most important and complex topic of research in liquid crystals today. The reduced symmetry in these organized phases leads to a variety of novel phase structures, properties, and applications. Molecular asymmetry imparts form chirality to liquid-crystalline phases, which is manifeste…
The free-base octabromotetraphenylporphyrin (H2OBP) has been prepared by a novel bromination reaction of (meso-tetraphenylporphyrinato)copper(II). The metal [V(IV)O, Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Ag(II), Pt(II)] derivatives exhibit interesting electronic spectral features and electrochemical redox properties…
The aim of the present study was to investigate whether angiotensin II, by increasing extracellular matrix synthesis, contributed to the vascular wall thickening observed in hypertension. Thus, we examined the direct effects of angiotensin II on collagen and fibronectin synthesis in cultured rat vascular smooth muscle…
The structure of pressure-densified vitreous ${\mathrm{SiO}}_{2}$ has been investigated using neutron-diffraction and molecular-dynamics techniques. After compression to 16 GPa at room temperature, recovered samples have densities 20% higher than normal vitreous ${\mathrm{SiO}}_{2}$ and show substantial changes in the…
The sol–gel process enables on to prepare oxide glasses at room temperature with little or no heating. By using this method, it is possible to encapsulate a wide variety of organic and organometallic molecules in the inorganic matrix. Studies of this new type of organic/inorganic composite have evolved towards two dif…
Part I: 1. The structure of simple liquids (I. McDonald). 2. Statistical mechanics of cellular automata fluids (M.H. Ernst). 3. Crystallization of liquids: a density functional approach (D. Oxtoby). 4. Theory of quantum processes in liquids (D. Chandler). 5. Aspects of structural glass transitions (W. Gotze). Part II:…
(1991). NEW MATERIALS BY MECHANICAL ALLOYING TECHNIQUES. Materials and Manufacturing Processes: Vol. 6, No. 4, pp. 733-736.
M. R. Bryce, Chem. Soc. Rev., 1991, 20, 355 DOI: 10.1039/CS9912000355
Hydrogen diffusivity and solubility in pure solid aluminum were measured in a high temperature range from 573 to 923 K, by means of a desorption technique, which was an outgassing study from thermally hydrogen-charged cylindrical samples with various grain sizes. The diffusion coefficient depended linearly upon an inv…
Abstract
Abstract The solubilization of silicates was investigated using kaolin and quartz sand as model substances. The mineral solubilization was studied in the concentration of solubilized Si and Al. The chemical leaching of the silicates was carried out using inorganic and organic acids as well as sodium hydroxide. The pro…
Poisson's ratio of cow teat skin was measured uni- and biaxially and shown to be anisotropic and dependent on aspect ratio. At strains below 0.1 (where Cauchy and Hencky strain are indistinguishable) the Poisson's ratio of cow teat skin measured biaxially is very much greater than 1.0, whereas the Poisson's ratio of d…
The decoction of the aerial part of Calotropis procera is commonly used in Saudi Arabian traditional medicine for the treatment of variety of diseases including fever, joint pain, muscular spasm and constipation. The present investigation was undertaken to confirm its claimed activity in traditional medicine. The etha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopy of calcium phosphate glasses with varying calcium oxide modifier concentrationsJeanne E. Pemberton, Lida Latifzadeh, Joseph P. Fletcher, and Subhash H. RisbudCite this: Chem. Mater. 1991, 3, 1, 195–200Publication Date (Print):January 1, 1991Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResolution and analysis of the components in dual emission of mixed-chelate/ortho-metalate complexes of iridium(III)Ashley P. Wilde, Kevin A. King, and Richard J. WattsCite this: J. Phys. Chem. 1991, 95, 2, 629–634Publication Date (Print):January 1, 1991Publication History P…
An efficient method allowing the transformer flux offset and exciting-current waveform to be determined for combined AC and geomagnetically induced current (GIC) excitation, without lengthy time-domain simulations, is described. This iterative approach solves for the equilibrium saturation condition using lumped-param…
A mercury ultramicroelectrode (Hg-UME) has been prepared by electrochemical deposition of mercury on an iridium substrate. The iridium UMEs can be prepared with radii of l-20 pm using a molten salt etching solution of NaCl and NaNOs. The Ir and Hg UMEs have been characterized by cyclic voltammetry and chronoamperometr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition of ozone on a silver catalystSeiichiro Imamura, Masaaki Ikebata, Tomoyasu Ito, and Takashi OgitaCite this: Ind. Eng. Chem. Res. 1991, 30, 1, 217–221Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January…
Abstract
Heteropolyanions [WM3(H2O)2(XW9O34)2]12–(X = M = Zn or CoII) form on ageing concentrated solutions of sodium salts of the well known polyanions [Zn(H2O)(ZnW11O39)]8– and [CoII(H2O)(CoIIW11O39)]8–. Their high-yield syntheses are reported. An X-ray crystallographic study of Na12[WZn3(H2O)2(ZnW9O34)2]·46H2O [Space group…