Materials Literature
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First‐principles calculations based on density–functional theory and pseudopotentials are used to calculate the energies and relaxed structures of five low‐index surfaces of α‐alumina. Evidence for the reliability of the theoretical methods is provided by calculations of the lattice parameters and internal coordinates…
The residual stresses created in polycrystalline aluminum oxide as a result of its constrained anisotropic thermal contraction are measured with the technique of piezospectroscopy using the fluorescence from trace Cr 3+ impurities. The average residual stresses in the crystallographic a and c directions are determined…
The plastic deformation of sapphire (α‐Al 2 O 3 ) has been studied under hydrostatic confining pressure at temperatures below the ambient pressure brittle‐to‐ductile transition temperature. Samples oriented for prism plane slip (Type I samples) were deformed via dislocation slip at temperatures as low as 200°C. Sample…
The oxidation of unidirectional SiC/C/SiC model composites has been investigated through thermogravimetric analysis, optical/electron microscopy, and electrical measurements. The influence of temperature and carbon interphase thickness on the oxidation of the composites is discussed. The oxidation involves three pheno…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTexaphyrins: Synthesis and ApplicationsJonathan L. Sessler, Gregory Hemmi, Tarak D. Mody, Toshiaki Murai, Anthony Burrell, and Stuart W. YoungCite this: Acc. Chem. Res. 1994, 27, 2, 43–50Publication Date (Print):February 1, 1994Publication History Published online1 May 2002P…
The crystal structure of ternary and binary substrate complexes of the catalytic subunit of cAMP-dependent protein kinase has been refined at 2.2 and 2.25 A resolution, respectively. The ternary complex contains ADP and a 20-residue substrate peptide, whereas the binary complex contains the phosphorylated substrate pe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLangmuir-Blodgett Manipulation of Size-Selected CdSe NanocrystallitesB. O. Dabbousi, C. B. Murray, M. F. Rubner, and M. G. BawendiCite this: Chem. Mater. 1994, 6, 2, 216–219Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published iniss…
Pyridoxal-5'-phosphate-dependent enzymes catalyze manifold reactions in the metabolism of amino acids. A comprehensive comparison of amino acid sequences has shown that most of these enzymes can be assigned to one of three different families of homologous proteins. The sequences of the enzymes of each family were alig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrinciple of Maximum Physical HardnessRalph G. PearsonCite this: J. Phys. Chem. 1994, 98, 7, 1989–1992Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/j100058a044https://d…
Abstract Sixteen structure types derive from the aristotypic rutile, TiO 2 , structure. Seven of these are based on an ordering of cations: the CoReO 4 , MgUO 4 , AlWO 4 , CuUO 4 , trirutile, CuSb 2 O 6 and FeNb 2 O 6 types; three on an ordering of anions: the InOOH, the manganite and HgFOH types; and six more on vari…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio studies of the copper(I) tetramers Cu4X4L4 (X = I, Br, Cl). Effects of cluster structure and of halide on photophysical propertiesMarcello Vitale, Chong Kul Ryu, William E. Palke, and Peter C. FordCite this: Inorg. Chem. 1994, 33, 3, 561–566Publication Date (Print)…
Although the size and shape of crystals in thin sections have been measured in a number of studies, it has not been possible so far to calculate from these data the true, three-dimensional shape and size of the crystals. \nA numerical model, based on orthogonal solids, has been developed to attack this problem. T…
Based on an introductory, graduate-level course given by Swartz at New Mexico State U., this textbook, written for students with a moderate knowledge of point set topology and integration theory, explains the principles and theories of functional analysis and their applications, showing the interpla
Abstract Phase transitions in the α‐, β‐, γ‐, and ϵ‐polymorphs of 2,4,6,8,10,12‐hexanitrohexaazaisowurtzitane (HNIW) have been studied as a function of temperature. Described are the results of high temperature equilibrium solvation studies coupled with Fourier transform infrared spectroscopy (FTIR) for the identifica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical Formation of the Anion Radical of Zinc Phthalocyanine and Analysis of the Absorption and Magnetic Circular Dichroism Spectral Data. Assignment of the Optical Spectrum of [ZnPc(-3)]-John Mack and Martin J. StillmanCite this: J. Am. Chem. Soc. 1994, 116, 4, 1292–…
The large-scale commercial use of synthetic polymers and their disposal in the environment is a phenomenon less than half a century old, a duration which is minuscule in the evolutionary time scale required for microbial evolution on earth. Consequently, unlike their naturally-occurring counterparts, the biopolymers,…
Ti−Ni thin films with three different compositions (Ti−48at.%Ni, Ti−50at.%Ni and Ti−51 at.%Ni) were prepared by sputtering. The sputter-deposited films were annealed at 773 K for 1 h to achieve crystallization. The stress-strain curves for the annealed films were measured over a wide temperature range (143–473 K) usin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSensitive Glucose-Induced Change of the Lower Critical Solution Temperature of Poly[N,N-(dimethylacrylamide)-co-3-(acrylamido)-phenylboronic acid] in Physiological SalineKazunori Kataoka, Hiroaki Miyazaki, Teruo Okano, and Yasuhisa SakuraiCite this: Macromolecules 1994, 27,…
Abstract Aliphatic homopolyesters and copolyesters based on 1,3‐propanediol and containing terephthalic acid as aromatic compounds and sebacic acid as aliphatic compound were synthesized by condensation in bulk. Intrinsic viscosity and weight‐average molecular weight were measured. Melting temperatures were studied by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Surface Water and Base Catalysis on the Silanization of Silica by (Aminopropyl)alkoxysilanes Studied by X-ray Photoelectron Spectroscopy and 13C Cross-Polarization/Magic Angle Spinning Nuclear Magnetic ResonanceKrishna M. R. Kallury, Peter M. Macdonald, and Michael…