Materials Literature
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The structural, electronic, and spectroscopic properties of a high-pressure phase of methane hydrate (MH-III) are studied by first principles electronic structure calculations. A detailed analysis of the atomic positions suggests that {\it ionization} of hydrogen-bonded water molecules occurs around 40GPa and {\it cen…
We have studied oil-in-water emulsions stabilized by monodisperse, fluorescent silica colloids presenting either a smooth or a rough surface. The presence of the fluorescent core allows for direct visualization of the colloids on the surface of the emulsion droplets. Droplet interfacial tension, measured by micropipet…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract For Abstract see ChemInform Abstract in Full Text.
The thermal expansion and the magnetic susceptibility under ambient pressure and the temperature dependence of electrical resistivity under applied pressures for β-Mn 1− x Os x alloys have been investigated. The concentration dependence of the spontaneous volume magneto-striction at 0 K, ω mag (0), exhibits a broad ma…
A structural instability of flexoelectric origin is predicted in a homeotropic cell, of insulating nematic liquid crystal, by the action of an electric field applied in the direction of the initially nonperturbed nematic director. The instability gives rise to a two-dimensional periodic structure. The critical field t…
GIS was first developed in various countries between 1968 and 1972. After about 5 years of experience, the use rate increased to about 20% of new substations in countries where space is limited. In other countries with space easily available, the higher cost of GIS relative to AIS has limited use to special cases. For…
Abstract Effective recovery processes for the Nd–Fe–B sintered magnet scrap (sludge) powders as α-Fe/Nd2O3 nanocomposite magnetic particles were established, so that the resin-bonded sheets produced from them showed good microwave absorption properties over a range of 4–8 GHz.
${\ensuremath{\gamma}}^{\ensuremath{'}}$-${\mathrm{F}\mathrm{e}}_{4}\mathrm{N}$ was subjected to electron irradiation with the dose rate of $6.8\ifmmode\times\else\texttimes\fi{}{10}^{23}e\text{ }\text{ }{\mathrm{m}}^{\ensuremath{-}2}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ in a 400 kV transmission electron microscope.…
Models of apocrustacyanin C(1) were refined against X-ray data recorded on Bending Magnet 14 at the ESRF to resolutions of 1.85 and 2 A from a space-grown and an earth-grown crystal, respectively, both using vapour-diffusion crystal-growth geometry. The space crystals were grown in the APCF on the NASA Space Shuttle.…
Abstract Polyurethane/clay nanocomposites have been synthesized using Na + ‐montmorillonite (Na + ‐MMT)/amphiphilic urethane precursor (APU) chains that have hydrophilic polyethylene oxide (PEO) chains and hydrophobic segments at the same molecules. Nanocomposites were synthesized through two different crosslinking po…
We present the results of crystallographic measurements on samples of two latexes: one with a relatively symmetric particle size distribution, and another with a highly skewed pseudobimodal distribution. For the skewed latex, crystallites are clearly visible, but they exhibit only a single Bragg reflection, indicating…
The crystal structure of a hypothetical protein AQ_1354 (gi 2983779) from the hyperthermophilic bacteria Aquifex aeolicus has been determined using X-ray crystallography. As found in many structural genomics studies, this protein is not associated with any known function based on its amino-acid sequence. PSI-BLAST ana…
The pressure behavior of Mn 2+ emission in the 10-, 4.5-, 3.5-, 3-, and 1-nm-sized ZnS:Mn 2+ nanoparticles is investigated. The emission shifts to lower energies with increasing pressure, and the shift rate (the absolute value of the pressure coefficient) is larger in the ZnS:Mn 2+ nanoparticles than in bulk. The pres…
Tetranuclear [Cu(4)mu(2)-dppm)(3)(mu(2)-mu(2)-NS(2))(mu(2)-mu(4)-NS(2))] (1) and pentanuclear [Cu(5)(mu(2)-dppm)(4)(mu(3)-mu-(3)-NS(2))(2)]PF(6) (2.PF(6)) (dppm = bis(diphenylphoshino)methane, NS(2)(2)(-) = 1,8-naphthalenedithiolate) were synthesized from the reactions between NS(2)(2)(-) and [Cu(2)(mu(2)-dppm)(2)(CH(…
The heterogeneous catalytic hydrogenation of polystyrene (PS) dissolved in decahydronaphthalene was studied in a batch reactor using 5% Pd/BaSO 4 as the catalyst. The effects of temperature and H 2 partial pressure were investigated over the ranges from 90 to 180 °C and 1.72 to 6.89 MPa. The PS concentration ranged fr…
Abstract Periodic mesoporous organosilicas have been successfully functionalized with sulfonic acid groups. The resulting materials exhibit much higher catalytic activity than ZSM-5 zeolite and higher catalytic stability than MCM-41 functionalized with the same group.
The overall crystal quality as well as the harvest period of bovine adenosine deaminase containing a zinc ion at the active centre has been compared in three different environments: crystallization as a control, crystallization with agarose gel and crystallization in a high magnetic field. In crystallization with agar…
We propose here a new model for gold nanoparticles, which are thought to be solubilized by either a Au(I)−citrate or Au(I)−sulfide layer. In the case of pure Au(0) particles, stabilization of the colloidal solutions occurs by inverse micelles or by tight adsorption of solvent covers, in particular acetone. The main ev…
The [Ru(CN)(6)](3-) ion is synthesized in aqueous solution and isolated as [Ph(4)As](3)[Ru(CN)(6)].2H(2)O (1). Compound 1 crystallizes as orange needles in the monoclinic space group P2(1)/n with cell parameters a = 11.346(2) A, b = 23.107(5) A, c = 25.015(5) A, beta = 99.55(3) degrees, V = 6467.1(22) A(3), Z = 4. The…