Materials Literature
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The pressure sensor proposed by Shen, Gregorian & Holzapfel [ High Press. Res. (1991), 7 , 73–75], based on the pressure-dependent shift of the luminescence line due to the 5 D 0 − 7 F 0 electronic transition of Sm 2+ in a matrix of BaFCl, has been tested in a diamond-anvil cell and calibrated against the R 1 − R…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of high-molecular-weight poly(phenylene sulfide) by oxidative polymerization via poly(sulfonium cation) from methyl phenyl sulfoxideEishun Tsuchida, Eiichi Shouji, and Kimihisa YamamotoCite this: Macromolecules 1993, 26, 26, 7144–7148Publication Date (Print):Decemb…
A simple isothermal constitutional mechanism is proposed to explain the oscillatory compositional zoning observed in many natural crystals. The model is based on the diffusion equation in an open system and realistic crystal-growth kinetics. A phenomenological partitioning coefficient K is introduced to relate the com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect observation of a consecutive two-step electron transfer in some zinc porphyrin-pyromellitimide-quinone triads which undergo the same mode of electron transfers as in the bacterial photosynthetic reaction centerMasaya Ohkohchi, Akiko Takahashi, Noboru Mataga, Tadashi O…
Static leach tests have been performed at glass surface area/leachant volume (SA/V) ratios of 10, 340, 2000, and 20 000 m−1 to assess the effects of the SA/V on the mechanism and rate of the glass reaction. Tests were performed using actinide-doped borosilicate waste glasses [Savannah River Laboratory (SRL) 131 and SR…
The crystal structure of 3:2 mullite (3Al2O 3 2.2SiO 2 ) has been refined by Rietvel refinement of x-ray powder diffraction data. The average structure is described successfully by previously published models for 2:1 mullite. Bond lengths of tetrahedral cations are slightly shorter, because of the smaller ionic radii…
Triaxial woven fabrics are attractive for industrial applications as a rein forcement of composite materials. In this article, tensile properties and fracture behaviors of carbon fiber triaxial woven fabric composites were discussed by comparing with biaxial woven fabric composites. Moreover, the effect of weave struc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions as soluble metal oxide analogs. Synthesis and characterization of the polyoxoanion-supported iridium(I) complex (1,5-COD)Ir.cntdot.SiW9Nb3O406-Yin Lin, Kenji Nomiya, and Richard G. FinkeCite this: Inorg. Chem. 1993, 32, 26, 6040–6045Publication Date (Print):Dec…
The acoustic and mechanical properties of renal calculi dictate how a stone interacts with the mechanical forces produced by shock wave lithotripsy; thus, these properties are directly related to the success of the treatment. Using an ultrasound pulse transmission technique, we measured both longitudinal and transvers…
The aging of dielectric, elastic and piezoelectric properties is caused by a reduction of the 90° domain wall mobility. Defect dipoles in the domains orient slowly in energetically preferred directions. The oriented defects increase the force constant for the reversible domain wall displacement by electric or elastic…
Drained direct and simple shear tests are analyzed assuming an isotropic elastoplastic constitutive law and plane strain conditions. The stress and strain distributions within the sample are examined. The numerical analyses are interpreted as if they were actual tests, using the computed stresses and displacements on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructure and doping level of the self-acid-doped conjugated conducting polymers: poly[n-(3'-thienyl)alkanesulfonic acids]Show An Chen and Mu Yi HuaCite this: Macromolecules 1993, 26, 25, 7108–7110Publication Date (Print):December 1, 1993Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomistic models of amorphous polybutadienes. 3. Static free volumeSanjay Misra and Wayne L. MatticeCite this: Macromolecules 1993, 26, 26, 7274–7281Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https:…
The Gd3+ complexes of three new phosphorus containing tetraaza macrocycles (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene ethylphosphonic acid), H4DOTEP; 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene phosphonic acid monoethylester), H4DOTPME; and the corresponding n-butyl ester, H4DOTPMB) w…
The application of a mechanical properties microprobe to evaluate the interfacial properties of fiber‐reinforced ceramic composites is addressed. The stress–displacement relation of the embedded fiber, which is subjected to an axial loading–unloading cycle, is analyzed. The interfacial bonding, Coulomb friction at the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of squaraine dyes. 6. Solvent hydrogen bonding effects on the photophysical properties of bis(benzothiazolylidene)squarainesSuresh Das, K. George Thomas, R. Ramanathan, M. V. George, and P. V. KamatCite this: J. Phys. Chem. 1993, 97, 51, 13625–13628Publication…
Fifty-four (!) hydrogen bonds stabilize the single supramolecular aggregate (1) formed from the cooperative selfassembly of ten molecules. Compound 1, designated as Hub-(MMM)3 · 9 neohex(CA) by the authors—conventional nomenclature and even the drawing of structural formulae are overtaxed—, further demonstrates the po…
Ab initio calcns. have been performed on TinO2n-δ clusters, with n = 1-3 and δ = 0, 1, as well as on some of their ionized species. The geometries of the different clusters were optimized and vibrational analyses were performed at the ground-state equil. geometries. The Ti-O bond lengths are essentially detd. by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric coordination complexes based on cobalt, nickel, and ruthenium that exhibit synergistic thermal propertiesLaurence A. Belfiore, Mary Pat McCurdie, and Eiji UedaCite this: Macromolecules 1993, 26, 25, 6908–6917Publication Date (Print):December 1, 1993Publication Hist…
Certain liquids with a very low vapour pressure, such as glycerol or triethylene glycol, can be used to infiltrate biological specimens so that they may be observed in the scanning electron microscope (SEM) without drying. The conductive properties of the fluids allow specimens to be examined either uncoated or with v…