Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous sonochemistry in radical-chain reactions. Sonochemical hydrostannation and tin hydride reductionEiichi Nakamura, Daisuke Machii, and Tsuyoshi InubushiCite this: J. Am. Chem. Soc. 1989, 111, 17, 6849–6850Publication Date (Print):August 1, 1989Publication History P…
The reaction sodalite = β-nepheline + NaCl ( s ) was reversed in solid-medium apparatus (923 K, 7.6–8.0 kbar; 973 K, 7.4–7.6 kbar; 1073 K, 7.8–8.0 kbar; 1173 K, 8.4–8.6 kbar) and the reaction sodalite = carnegieite + NaCl ( l ) was reversed at 1 bar (1649–1652 K). The calculated slope for the first reaction is −11 bar…
Methods which determine the number and disorder of lattice planes in a crystal from the Fourier cosine coefficients of the intensity profile of an X-ray reflection use only the low harmonics and require that the coefficients be normalized so that the zero harmonic is unity. Experimentally, the profiles can only be rec…
Y(hfac),NITEt (hfac = hexafluoroacetylacetonate; NITEt = 2-ethyl-4,4,5,5-tetramethyl-4,5-dihydlrHo--i midazolyl- 1-oxy 3-oxide) crystallizes in the monoclinic s ace group P21/n with cell parameters a = 11.245 (1) A, b = 17.257 (7) A, c = 18.357 (3) A, 0 = 98.39 (l)", V = 3524.13 R3, and 2 = 4. The crystal structure de…
Studies of the susceptibility of carbon steel (line pipe steel) to pitting were performed at room temperature in deaerated, NaCl-saturated CO2-containing solution simulating natural brine. Measurements of different kinds were made in a wide range of pHs and electrode potentials. The primary corrosion product was ident…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 260. Allylation of .alpha.-hydroxy ketones with allyltrifluorosilanes and allyltrialkoxysilanes in the presence of triethylamine. Stereochemical regulation involving chelated bicyclic transition statesKazuhiko Sato, Mitsuo Kira, and Hide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of elasticity of amorphous networks: effect of constraints along chainsBurak Erman and Lucien MonnerieCite this: Macromolecules 1989, 22, 8, 3342–3348Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTitanium Dioxide Based Substrate for Optical Monitors in Surface-Enhanced Raman Scattering AnalysisJob M. Bello, David L. Stokes, and Tuan. Vo-DinhCite this: Anal. Chem. 1989, 61, 15, 1779–1783Publication Date (Print):August 1, 1989Publication History Published online14 Octo…
Les structures cristallines de sept composes de structure perovskites sont analysees du point de vue du polyedre de coordination de cation. L'analyse indique qu'un compose ABO 3 de structure perovskite peut etre ferroelectrique si le rapport du volume de l'ion A cuboctaedrique et celui de l'ion B octaedrique vaut exac…
Combined oxide additives (Y 2 O 3 , CaO, La 2 O 3 , CeO 2 , SiO 2 , TiO 2 , and Fe 2 O 3 ) were investigated as AIN sintering aids. AIN can be fully sintered at 1600°C to substantial thermal conductivity (92 W/(m·K)) using a multiple sintering aid of Y 2 O 3 , CaO, SiO 2 , La 2 O 3 , and CeO 2 . This lowtemperature ma…
Abstract not Available.
Glucose dehydrogenase was purified to homogeneity from the thermoacidophilic archaebacterium Thermoplasma acidophilum. The enzyme is a tetramer of polypeptide chain Mr 38,000 +/- 3000, it is catalytically active with both NAD+ and NADP+ cofactors, and it is thermostable and remarkably resistant to a variety of organic…
It has often been suggested that a high pressure, Si in silicate melts should change from four to higher coordination. Transition states involving five-coordinated Si have often been observed in molecular dynamics simulations even at low pressure and have been given a key in configurational change and viscous flow. Us…
The glass transition and heat capacity of hyperquenched glassy water have been studied by differential scanning calorimetry and by isothermal measurements from 103 K to a temperature where its crystallization to cubic ice is complete. Glassy water shows a thermally reversible glass-liquid transition and has a Tg, of 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray absorption edge and EXAFS study of the copper sites in zinc oxide methanol synthesis catalystsLung Shan Kau, Keith O. Hodgson, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1989, 111, 18, 7103–7109Publication Date (Print):August 1, 1989Publication History Published…
A series of freestanding conducting polypyrrole and poly‐3‐methylthiophene films was prepared and examined by x‐ray diffraction and transmission electron microscopy (TEM). The degree of order observed in polypyrroles was highly dependent upon the incorporated "dopant" anions and also on deposition conditions. Examinat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservations on silver salt metathesis reactions with very weakly coordinating anionsDavid J. Liston, Young Ja Lee, W. Robert Scheidt, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1989, 111, 17, 6643–6648Publication Date (Print):August 1, 1989Publication History Publi…
Tetrahedral-site occupations were determined for three titanian andradites (San Benito County, California) and a synthetic deuterated hibschite by using X-ray single-crystal and neutron powder data, respectively. Site refinements reveal the presence of tetrahedral vacancies (4-14%) in all three andradites. Infrared ab…
The powdered seeds of Acacia arabica and roots of Caralluma edulis were administered in doses of 2, 3 and 4 gm/kg body-weight to normal and alloxan-diabetic rabbits. The blood glucose levels were estimated before and 2, 4, 6 and 8 hours after the administration of plant suspension. The powdered seeds of Acacia arabica…
Observations of the grinding‐induced transformation in singlephase Ce‐TZP materials, referred to in an earlier paper, are presented. Two techniques were used to grind the surface: by hand in a slurry of abrasive particles and with a high‐speed diamond‐impregnated wheel. Significant differences in X‐ray diffraction pro…