Materials Literature
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A phase transition between states of a nematic liquid crystal in a spherical drop was detected experimentally and described theoretically. This transition took place between states which differed solely in respect of the symmetry of a topological point defect (hedgehog) at the center of the drop. The transition occurr…
The physical contrast ratios (CRs) of an electrooptic switching element using a pyrimidine type ferroelectric liquid crystal (LC) was investigated. The electrooptic response of the element to the AC square wave voltages was shown to be strongly dependent both on the amplitudes and frequencies of the applied voltages.…
Potentiodynamic polarization techniques were used to determine characteristic pitting potentials for Alloy 800 in chloride and chloride-sulfate media. The effect of chloride concentration in the range of 0.001 to 1 M was investigated. Decreasing chloride concentrations resulted in noble shifts of the critical nucleati…
Abstract X‐ray diffraction, positron annihilation, electron microscopy and bulk density measurements are reported as a function of the degree of acetylation for a linters cotton. Heterogeneous reaction proceeds with a retention of ordered structure in the fibers. Substitution does increase the extent of disorder but i…
m e reactions of the w t a l s a l t s of a-isocyanoacetate e s t e r s with isothiocyanates and isccyanates =re examined.me e f f e c t s of mrliQing the reaction paramstem on t h e altcm of the reaction (Schem?I1 of methyl a-isocyanoacetate ( G I with phew1 isothiocyanate (21 have been studied, thus providing elhawe…
Abstract Copper surfaces were ground or polished to various surface roughnesses and analysed by WDS and EDS. Both K and L photons were analysed at the accelerating voltages 5, 15 and 45 kV. The influence of topography on the K‐peak intensity was negligible, while the L‐peak intensity was rather sensitive to the surfac…
The Frank elastic constant for twist deformation k 22, has been determined as a function of temperature for 5CB and compared with values cited in literature. The results, together with the values of the elastic constants for splay, k 11, and bend, k 33, which have been measured recently by Bradshaw et al. and the valu…
Corrosion control is usually implemented by alloy upgrading or material substitution, environmental modification or providing a protective barrier or sacrificial surface or both. Historically, the coatings approach has been the predominant first choice based on initial economics. Current and emerging coating technolog…
The disproportionation of neutral five-co-ordinate [Au(phen)(CN)2Br](phen = 1,10-phenanthroline) in dimethylformamide (dmf) gives a conducting solution from which two charged species, [Au(phen){(CN)0.92Br0.08}2]Br (1) and [Au(phen)(CN){(CN)0.82Br0.18}]·0.5trans-[Au(CN)2Br2]·0.5Br·phen (2), have been separated and char…
The thermomechanical relationship between mullite and a lithium aluminosilicate (LAS) glass‐ceramic has been studied by a technique of bimaterial dilatometry. The viscoelastic behavior of LAS was found to result in a temperature T rvsl below the glass‐transformation temperature T g at which the interfacial stresses be…
Wet granulation, using lactose as an excipient, is widely used in the pharmceutical industry. The use of micro-crystalline cellulose, as part of the excipient, may offer several advantages. The purpose of this work is to investigate the effect of ingredients and processing variables on granule quality. For these studi…
The two-dimensional degenerate Fermi gas of electrons interacting with phonons is considered. The basic mechanisms of momentum relaxation in such a system, associated with electron-phonon, phonon-phonon and electron-electron collisions, are shown to be qualitatively different from similar mechanisms in an ordinary thr…
EPR of Fe 3+ in distorted tetrahedral sites in single crystals of β-Ga 2 O 3 has been measured for the first time, and the second-order zero-field splitting (ZFS) parameters and principal axes directions were determined. The data for the sixfold coordinated Fe 3+ are in good agreement with results from the literature.…
Abstract The crystal and molecular structures of the chloroacetato complexes of gadolinium(III), erbium(III), and ytterbium(III) indicated in the title were determined by the single-crystal X-ray diffraction method. In addition to these three complexes, the isomorphous dysprosium(III) salt was also obtained. Their che…
Abstract When subjected to heat and mechanical shear PVC decomposes via the elimination of HCl. This process is controlled most efficiently by the use of organotin stabilisers. This review outlines the basic degradation/stabilisation mechanisms which are involved in these processes. The organotin compounds of most com…
The surface interactions of the thermodynamically stable oxides of the firstrow transition metals with hydrazine, N2H4, have been assessed by X-ray photoelectron spectroscopy (X.p.s.), and the observed reactivity explained on the basis of the oxides' thermodynamic and acid–base properties. Microgravimetry, transmissio…
ZnO–CaO (molar ratio 9 : 1) exhibited a high catalytic activity (100% conversion) and selectivity (91%) for formation of acetone from ethanol at 673 K.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metallo hydride, formyl, and alkyl complexes of Rh(TMTAA)Seth L. Van Voorhees and Bradford B. WaylandCite this: Organometallics 1987, 6, 1, 204–206Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1…
This book compiles papers presented at a conference on the subject of advancement of materials and process engineering. Some of the topics discussed are: Effect of laser radiation on rapid processing of graphite-reinforced composites; fiber reinforced ceramic composites; thermal analysis for pultrusion process modelli…
A new compound WAlB has been prepared using α-WB single crystals as a starting material and Al metal as a flux in argon atmosphere, and the optimum conditions for obtaining the compound in a pure phase were examined. A pure WAlB phase was obtained by heating a mixture of α-WB (0.66wt%) and Al at 1500°C for 10h. The cr…