Materials Literature
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Abstract PdAs 2 , PdSb 2 , PtSb 2 and PtBi 2 have been formed from reactions of 1‐gram samples of the elements in quartz tubes at 923 K, and their crystal structures have been reinvestigated. These materials crystallize with the pyrite structure. The lattice constant, a , and the positional parameter, x, of the nonmet…
Barium gallogermanate glasses were prepared with substitutions of Al 2 O 3 , Y 2 O 3 , La 2 O 3 , and Gd 2 O 3 for Ga 2 O 3 . The effects of these substitutions on the glass transformation temperature, viscosity, thermal expansion, and molar volume have been determined. The changes in properties associated with each s…
A theoretical model is demonstrated that provides a reliable prediction of thermal transmission through nonwoven structures. The validity of the model is confirmed in experiments that measure the thermal conductivity of various nonwoven barrier fabrics. The model is used to characterize the relative contribution of he…
We present a second virial theory of the isotropic-to-nematic phase transition in solutions of (polydisperse) wormlike micelles interacting via a hard-core excluded volume. Analytical expressions are derived for the osmotic pressures and the chemical potentials of the surfactant molecules in the coexisting phases. In…
Size effects in two-phase Boolean magnets composed of an aligned hard phase and a soft phase with high magnetization are investigated. In 'overcritical' magnets, where the size of the soft regions is larger than the Blochwall width /spl delta//sub h/ of the hard phase, the energy product is reduced compared to the cor…
Earlier covalent modification experiments indicated that histidine, arginine, and carboxylic acid residues were involved in the catalytic mechanism of the acid phosphatase enzyme from human prostate. The present study utilizes site-directed mutagenesis to evaluate the catalytic importance of 7 residues of human prosta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral Poly(dipentylsilylene) CopolymersHolger Frey, Martin Moeller, and Krzysztof MatyjaszewskiCite this: Macromolecules 1994, 27, 7, 1814–1818Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.…
The high-potential iron-sulfur protein (iso-form II) isolated from Ectothiorhodospira vacuolata has been crystallized and its three-dimensional structure determined by molecular replacement procedures and refined to 1.8-A resolution with a crystallographic R factor of 16.3%. Crystals employed in the investigation belo…
Abstract Samples of natural clinoptilolite modified by treatment with NH 4 Cl or HCl solutions, followed by thermal treatments, have been characterized, and their catalytic activity evaluated, in o-xylene isomerization and ethanol dehydration reactions. The substitution of the compensating cations by NH4+ does not pro…
Abstract Solutions of the stationary and time‐dependent equations of diffusion are presented for contamination when scanning a rectangular area in the scanning electron microscope (SEM). A method is described to record the thickness of the contamination layer by the signal of secondary or backscattered electrons and t…
The mono- and trisubstituted peroxyniobium polyoxotungstates of formulas [(CH3)3NH]7[Si-(NbO2)3W9O37], Cs7[Si(NbO2)3W9O37], alpha-K5[Si(NbO2)W11O39] and alpha-[(CH3)3NH]5[Si(NbO2)-W11O39], have been prepared, purified, and characterized spectroscopically by 29Si NMR, 183W NMR, and IR. The presence of peroxo groups was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Poly(carborane-siloxane-acetylene)Leslie J. Henderson and Teddy M. KellerCite this: Macromolecules 1994, 27, 6, 1660–1661Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https:…
Polymer‐protected bimetallic clusters areexcellent candidates as catalysts for various chemical reactions. For Example, Cu/Pd clusters accelerate the hydration of acrylonitrile (See Figure). However, hurdles femain to be overcome in their preparation. Following a brief overview of preparative techniques, details are g…
Attenuation of Syrian hamster 3-hydroxy-3-methyl-glutaryl coenzyme A reductase (HMG-CoA reductase, EC 1.1.1.34) activity by in vitro phosphorylation was studied using AMP-activated protein kinase and wild-type and mutant forms of HMG-CoA reductase. The only residue of the wild-type enzyme phosphorylated was Ser871. Su…
The thermal conductivities of solid layers of thicknesses from 0.01 to 100 μm affect the performance and reliability of electronic circuits, laser systems, and microfabricated sensors. This work reviews techniques that measure the effective thermal conductivity along and normal to these layers. Recent measurements usi…
Cooperative magnetic interactions have been observed in α‐[MnPc][TCNE], which results from the reaction of manganese phthalocyanine with tetracyanoethylene. This is the latest in a series of molecule based materials found to exibit such unusual magnetic behaviour. The α polymorph displays very strong magnetic coupling…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTFormation and Interaction of Carbonyls and Nitrosyls on Gold(I) in ZSM-5 Zeolite Catalytically Active in NO Reduction with COShilun Qiu, Ryuichiro Ohnishi, and Masaru IchikawaCite this: J. Phys. Chem. 1994, 98, 11, 2719–2721Publication Date (Print):March 1, 1994Publication Histo…
The numerical approach, proposed by us in an associated paper, is further developed here to account for the processes of ordering and disordering in a 2D idealized elasto-plastic body. Study of the kinetic and structural aspects of such processes reveals various features characteristic of the glass transition and stru…
Simplified preparative procedures are described for the generation of α-[PW_(11)O_(39)Cr^(III)(OH_2)]^(4-) and α2-[P_2W_(11)O_(61)Cr^(III)(OH_2)]^(7-) anions which can be readily oxidized, chemically or electrochemically, to α-[PW_(11)O_(39)Cr^(V)O]^(4-) and α2-[P_2W_(17)O_(61)Cr^(V)O]^(7-). The oxidized complexes are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Investigations of the Complexes Resulting from the Acid-Promoted Deoxygenation and Dimerization of (N,N'-Ethylenebis(salicylideneaminato))oxovanadium(IV)Eishun Tsuchida, Kimihisa Yamamoto, Kenichi Oyaizu, Naoki Iwasaki, and Fred C. AnsonCite this: Inorg. Chem…