Materials Literature
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Abstract Tensile yield stress measurements have been performed on a serie of four ethylene/1‐butene copolymers covering the crystallinity range 0.33–0.74. Samples have been prepared from melt‐crystallization and from solution‐crystallization at various concentrations in decalin in order to span a wide range of crystal…
The results of polarized Raman scattering, far-infrared (FIR) absorption, Kramers-Kronig analysis of FIR reflectance, and lattice-dynamical calculations of the perovskitelike compound ${\mathrm{YBaCuFeO}}_{5}$ (space group P4mm) are reported. All 16 Raman- and infrared-active \ensuremath{\Gamma}-point phonons (6${\mat…
The first-order Raman spectra of single-crystal cubic boron nitride for the range of 300 to 1830 K are presented. The Stokes and anti-Stokes components of both the TO (\ensuremath{\Gamma}) and the LO (\ensuremath{\Gamma}) modes are analyzed for their Raman shift and width variation with temperature. The cubic boron ni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer states of bridged transition metal dimers: mono- vs binuclear copper azide systems with relevance to oxy-hemocyaninFelix Tuczek and Edward I. SolomonCite this: Inorg. Chem. 1993, 32, 13, 2850–2862Publication Date (Print):June 1, 1993Publication History Publis…
CheY, the 14-kDa response regulator protein of the Escherichia coli chemotaxis pathway, is activated by phosphorylation of Asp57. In order to probe the structural changes associated with activation, an approach which combines 19F NMR, protein engineering, and the known crystal structure of one conformer has been utili…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel photocrosslinkable liquid-crystalline polymers: poly[bis(benzylidene)] estersGangadhara and Kaushal KishoreCite this: Macromolecules 1993, 26, 12, 2995–3003Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993h…
The cubic-tetragonal phase transition in leucite has been examined using static lattice energy calculations with realistic, tested interatomic potentials. The calculations have demonstr~ted that the ~ransitio~ is not triggered by AI-Si ordering and can occur without any ordenng. Any AI-Sl order w1l1have only a minor e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of microdomain structures on the molecular orientation of poly(styrene-block-butadiene-block-styrene) triblock copolymerShinichi Sakurai, June Sakamoto, Mitsuhiro Shibayama, and Shunji NomuraCite this: Macromolecules 1993, 26, 13, 3351–3356Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron porphyrin-catalyzed oxidation of 1,2-dimethoxyarenes: a discussion of the different reactions involved and the competition between the formation of methoxyquinones or muconic dimethyl estersIsabelle Artaud, Khaled Ben-Aziza, and Daniel MansuyCite this: J. Org. Chem. 199…
The mechanical properties, i.e., Young's modulus, fracture toughness, and flexural strength, of SiC‐platelet/Al 2 O 3 composites with two different platelet sizes were studied. Both Young's modulus and the fracture toughness of composites using small platelets (12 μm) increased with increasing SiC volume fraction. Max…
The fracture of 0·7–0·8 mm diameter lead glass and single-crystal sapphire spheres has been investigated, under conditions of slow uniaxial compression and free impact. A wide range of metallic and ceramic materials was used for the compression platens and targets. The spheres fractured into large fragments, and the c…
We study the intrinsic magnetic bistability of conduction-electron spins in gallium oxide \ensuremath{\beta}-${\mathrm{Ga}}_{2}$${\mathrm{O}}_{3}$ by electron-paramagnetic-resonance (EPR) spectroscopy. This compound, normally an insulator, becomes an n-type semiconductor when synthesized under reducing conditions. The…
Ever since the hexatic phase was proposed more than 14 years ago in the context of two-dimensional melting theory, the concept of hexatic order has offered unique insight into the nature of several liquid-crystal phases, namely the hexatic-B, smectic-I and smectic-F phases. Moreover, these liquid-crystal phases have o…
A method is presented for determining the characteristic quantities and model parameters from the given frequency responses x/sub d/(js), x/sub q/(js). The curves of values measured on a large turbogenerator at standstill are used as an example. The characteristic values and model parameters are determined for various…
Abstract Structural Fe in ferruginous smectite (sample SWa-1, Source Clays Repository of the Clay Minerals Society) was reduced by a mixture of five Pseudomonas species of bacteria in a defined Fe-free medium to determine the effect of microbial reduction on clay swelling. Iron(II), total Fe, and gravimetric water con…
Abstract Structural and diffraction criteria for distinguishing between t-1M, c-1M, m-1M, and 3T illite varieties are described. The t-1M illite corresponds to a one-layer monoclinic structure with vacant transsites. The c-1M illite has vacant cis-octahedra forming one of two symmetrically independent point systems; t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasma deposition of ultrathin films of poly(2-hydroxyethyl methacrylate): surface analysis and protein adsorption measurementsGabriel P. Lopez, Buddy D. Ratner, Richard J. Rapoza, and Thomas A. HorbettCite this: Macromolecules 1993, 26, 13, 3247–3253Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective reduction of nitrogen oxides (NOx) by ammonia over honeycomb selective catalytic reduction catalystsJiri Svachula, Natale Ferlazzo, Pio Forzatti, Enrico Tronconi, and Fiorenzo BreganiCite this: Ind. Eng. Chem. Res. 1993, 32, 6, 1053–1060Publication Date (Print):Jun…
We discuss the deformation of a fluid droplet in an emulsion under external forces, such as those exerted by contact with neighboring droplets. We find that the deformation energy associated with a small droplet-droplet contact scales as f 2 ln (1/ f ) with the force f exerted between droplets. We consider the equatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic carbon-halogen bond cleavage chemistry by redox-active polyoxometalatesDaryush Sattari and Craig L. HillCite this: J. Am. Chem. Soc. 1993, 115, 11, 4649–4657Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June…