Materials Literature
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The dielectric relaxation of glycerol and n-propyl alcohol in the supercooled liquid state has been investigated at frequencies from 5 Hz to 13 MHz and at pressures up to 1 GPa. The high-pressure dielectric cell and the measurement procedures are described in detail. A significant broadening of the loss peak is observ…
Carbonyl compounds are reduced with trialkoxy-substituted silane to the corresponding alcohols chemo- and stereo-selectively in the presence of alkali metal alkoxide under mild conditions; reduction occurs very smoothly by using an alkoxide derived from pinacol as a bidentate ligand.
The blood concentration and urinary excretion after intravenous injection of liposomes containing 3H-inulin at three dose levels were examined in rats. A pharmacokinetic model for the dose dependency is postulated based on the results. The effects of vesicle size were also examined and the biological disposition was s…
The antiferromagnetic mixed valence manganese complex [Mn6O2(Me3CCO2H)4(Me3CCO2)10] has been prepared by the reaction of MnCO3 with pivalic acid in toluene, and its molecular structure, determined by X-ray methods, comprises the new polynuclear cluster grouping of two tetrahedral oxygen-centred tetramanganeses cluster…
A new class of metal-containing liquid crystals, comprising a mesogenic organic ligand (nitrile or amine) co-ordinated to Pd, Pt, Rh, and Au, have been prepared and characterised.
A thin but tough adhesive inner layer placed in laminates at the proper interface has been found to give improved delamination strength. Static tension tests of laminates with (±302/˙903/∓302)T and (±35/0/90)s layups of graphite/epoxy show that the added adhesive inner layer effectively suppresses delamination until f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study of the influence of strain rate and temperature on the maximum strength of perfectly ordered and oriented polyethyleneYves Termonia, Paul Meakin, and Paul SmithCite this: Macromolecules 1986, 19, 1, 154–159Publication Date (Print):January 1, 1986Publication…
In the Catalina Schist terrane, a nappe of blueschist facies melange is overlain by one of isoclinally-folded greenschist facies rocks. The blueschist unit contains meta-graywacke, metashale, metaconglomerate, greenstone, quartz schist, blueschist, and eclogite blocks in a fine-grained, schistose matrix which probably…
A new type of ferroelectric liquid crystal, the 4′-alkoxybiphenyl-4-yl (2S,3S)-3-methyl-2-halogenopentanoates, has been synthesized; these compounds possess novel ferroelectricity, with spontaneous polarization and dielectric constant larger than 10–7 C/cm2 and 6000, respectively.
Abstract The liquid structure of N-methylformamide (NMF) has been investigated by the X-ray diffraction method and the ab initio MO-SCF method. The structure parameters within a molecule were obtained as follows: C=O : 122(1) pm, C(methyl)–N : 145(2) pm, C(carbonyl)–N : 134(2) pm, N···O : 222(4) pm, C(methyl)···O : 27…
Abstract The interfacial structure and diffusion kinetics of two compatible polymers, poly(methyl methacrylate) and poly(vinylidene fluoride) are studied in the melt. The interdiffusion rates of the two components are found to be unequal, giving unequal diffusion coefficients, a net mass flow across the interface, and…
We describe a new approach to probe the molecular biology of the living cell that uses small colloidal gold particles coupled to specific ligands. They are visualized in cells by bright-field, video enhanced contrast microscopy. We describe the basic aspects of the technique and provide examples of applications to int…
The kinetics and energetics of chromium-sensitized neodymium luminescence of several codoped gallium garnets (YAG, YSGG, GGG, and GSGG) have been measured and interpreted in terms of microscopic physical-energy-transfer mechanisms. Sensitized luminescence in YAG and in YSGG is well described by the static energy-trans…
Controlled potential electrolysis of the dilithium salt of phthalocyanine, Li2(pc2–), at 0.15 V vs. saturated calomel electrode in acetonitrile gave a lithium complex of the phthalocyanine radical, the crystal structure of which shows that it contains a unit cell with four nearly planar Li(pc˙–) molecules of S4 symmet…
High conversions of alkanes into alcohols and ketones were obtained by using H2O2 as an oxidizing agent and a Mn-prophyrin as the catalyst in the presence of imidazole; yields between 40 and 85% for oxidation of cyclohexane, cyclo-octane, adamantane, and various compounds containing a benzylic C-H bond by diluted aque…
A copper phthalocyanine with four crown ether voids has been synthesized; its high tendency towards aggregation, especially K+-induced aggregation, which enables the phthalocyanine to be used as a colorimetric reagent, is reported.
The cholesteric liquid crystalline phases of three polymers of biological interest have been investigated: PBLG (a polypeptide), DNA (a polynucleotide) and xanthan (a polysaccharide). The textures (and the defects which they contain) of these three mesophases are analysed and compared The main difference concerns foca…
The oxidation of pyrrole to conducting polypyrrole by iron(III) salts represents a valid and more versatile alternative to the usual anodic oxidation.
Variable-temperature powder X-ray diffractometry, Fourier-transform infrared spectroscopy and 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectroscopy have been used to elucidate both the nature of alumina pillars introduced into sheet aluminosilicate and to monitor changes in structure of the host m…
The phase diagram of the two-dimensional classical Coulomb gas is investigated by Monte Carlo simulations. We show that in the fluid phase this system undergoes the expected Kosterlitz-Thouless transition at very low densities and that the Kosterlitz-Thouless transition becomes a first-order phase transition between a…