Materials Literature
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The number and type of hydroxy groups on a TiO2 surface can be determined using a combination of wet chemical techniques, F– exchange, OH– and Fe(acac)3(Hacac = pentane-2,4-dione) adsorption, and i.r. spectroscopy.
The crystal and molecular structure and magnetic behaviour of [{Cu(NCO)(OCH2CH2NEt2)}4](B) from benzene have been determined. The crystal structure determination was carried out by single-crystal X-ray diffraction methods and refined to R= 0.066 for 4 379 independent reflections: triclinic, space group P, with unit-ce…
Experimental evidence for a Blue Phase of hexagonal symmetry is reported. In agreement with a theoretical prediction by Hornreich et al., this new Blue Phase has been found in a short pitch cholesteric liquid crystal of positive dielectric anisotropy submitted to a large enough electric field. Its symmetry, compatible…
Lactic acid was polymerized using tetraphenyl tin as a catalyst. The molecular weight of the resultant poly(lactic acid) varied between 0.89 X 10(6) and 2.94 X 10(6) depending upon the concentration of the catalyst used. In-vivo degradation of the poly(lactic acid) samples having 4 different molecular weights were stu…
The sedimentation volume, V sed of polymer particles in mixtures of pairs of nonpoiar as well as polar liquid combinations was determined at 20°C The liquid combinations were chosen such that the interfacial tension, γSV, of the polymer particles fell between the surface tensions of the two liquids. Constant: amounts…
The production of β‐sialon (Si3A1303N5) and nonoxidic powders by carbothermal reduction of oxides is discussed. Special attention is paid to the rate‐determining steps in the conversion process performed in a packed‐bed reactor. It is shown that powders with specific surface area >10 m 2 /g can be produced by the c…
In order to investigate the grain boundary fracture in molybdenum with 〈110〉 symmetric tilt boundaries, the four-point bending test was conducted at 77 K by using bicrystals with various misorientations from 0° to 90°. A stress-strain curve to fracture was measured as a function of misorientation angle φ. Two classes…
The crystal and molecular structure of nematogen 4′-n-Pentyloxy-4-Biphenylcarbonitrile has been determined by direct methods. The crystals belong to the monoclinic system with space group P21/n. a = 21.378(5), b = 5.695(3), c = 12.789(2) Å, β = 106.074(17)° with four molecules per unit cell. Least-squares refinement l…
The development of microparticulate food particles for marine suspension-feeders is discussed with respect to the difficulties of nutrient delivery in the aquatic environment and to feeding and digestion in crustacea and bivalve molluscs. Loss of nutrients from particles suspended in seawater must be minimized by eith…
A hybrid aligned nematic liquid crystal sample presents a bulk flexo-electric polarization P. The coupling of P with an external electric field normal to the bounding plates allows, for weak anchoring, a texture distortion. We report a new linear flexo-electro-optic effect in such a cell with a weak anchoring, which p…
The analytical formalism for evaluating the steady state hydrogen (tritium) inventory, recycle and permeation rate and recycle time for surfaces exposed to the plasma of an operating magnetic confinement fusion reactor is reviewed and new material relevant to the application of this theory is presented. The formalism…
The ZrO/W thermal field emitter (TFE) has proven to be a useful high brightness electron source for a variety of microprobe applications. Desirable source characteristics are: 1 to 2 mA/sr angular intensity, 1 to 1.5 eV energy spread for an emitter radius of 0.6 to 1 μm, and <0.5% noise level between 1 Hz and 2…
The first example for μ-aqua-μ-oxo bridging of two transition-metal centers is the cation of 2. This compound is formed as green crystals from CuCl2·2H2O and L in methanol after addition of aqueous NaClO4 solution. 2 is ferromagnetic. 1, the cation of which belongs to a frequently encountered type, is formed as blue c…
It is shown that the properties of the upper critical fields in organic superconductors can be understood in terms of pure type II superconductivity. The experimental observation of high critical fields violating Clogston's criterion could give support in favour of triplet-paired superconductivity.
Several new series with the general formula [graphic] in which R2 is a lateral unbranched or branched chain of up to considerable length, were prepared. The compounds exhibit nematic properties. With the aid of molecular statistical theories and other arguments, we discuss the conformations of the lateral substituents…
Cynometallates display molecular sieving properties, which can be predicted on the basis of their specific structure; very effective separations of C6 isomers and of CO2–CH4 mixtures are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipotassium bis([8]annulene)ytterbate(II) and -calcate(II)Steven A. Kinsley, Andrew Streitwieser Jr., and Allan ZalkinCite this: Organometallics 1985, 4, 1, 52–57Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1 January…
Tetra-2,3-pyridinoporphyrazines (29H,31H-tetrapyrido[2,3-b : 2′,3′-g : 2″,3″-l : 2‴,3‴-q]porphyrazine)(1) and the corresponding water-soluble NN′N″N‴-tetramethylated quaternized tetracationic forms (2) with different central metal atoms were prepared and their photoredox activities investigated. The synthesis of (2; M…
The synthesis of a discogen based on a phthalocyanine on a phthalocyanine subunit is described; the discogen shows C2v symmetry and possesses a high permanent electric on dipole moment within the plane of the aromatic macrocyclie, leading to a new type of discotic mesophase.
A major investigation of the oxygen-deficient perovskite phase SrFeO3–y(0.15 < y < 0.25) has been carried out using 57Fe Mössbauer spectroscopy, X-ray powder diffraction, and magnetic susceptibility measurements. The Mössbauer spectra have been recorded for a variety of samples at many temperatures in the range 4.2–90…