Materials Literature
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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…
Conducting poly(9-alkylfluorene) and poly(9,9-dialkylfluorene) with long alkyl chains have been prepared and found to be fusible at relatively low temperature. Unlike in poly(3-alkylthiophene), electrical conductivity and band gap energy do not change remarkably at the solid-liquid phase transition. These polymers als…
Electronic structure calcns. were performed on the chemisorption of at. oxygen on Ag(110) and on the subsequent reaction of this chemisorbed oxygen with ethylene. These calcns. show that the presence of subsurface oxygen (i) reduces the bond energy between silver and adsorbed oxygen and (ii) converts the repulsive int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2,4,4,5,5-Hexakis(2,6-diethylphenyl)pentastanna[1.1.1]propellane: characterization and molecular structureLawrence R. Sita and Richard D. BickerstaffCite this: J. Am. Chem. Soc. 1989, 111, 16, 6454–6456Publication Date (Print):August 1, 1989Publication History Published on…
The quinonoid analogues of TTF are better electron donors than TTF itself. Their prototype 4 has now been synthesized for the first time. Wittig–Horner reaction of the dithiol derivative 1 with the cyclopentadiene adduct of benzoquinone, 2, gives 3, which undergoes retro-Diets–Alder reaction to yield 4 as dark red cry…
The formation of liposomes and their application as delivery systems for injectable drugs are described. Liposomes are microscopic vesicles composed of one or more lipid membranes surrounding discrete aqueous compartments. These vesicles can encapsulate water-soluble drugs in their aqueous spaces and lipid-soluble dru…
Electrochemical and spectroscopic measurements were used to characterize the electrochromic behavior of sputtered V2O5 films. In response to lithium intercalation, the fundamental optical absorption edge of V2O5 shifts to high energies by 0.20–0.31 eV as the lithium concentration increases from Li0.0V2O5 to Li0.86V2O5…