Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe origin of infrared marker bands of porphyrin .pi.-cation radicals: infrared assignments for cations of copper(II) complexes of octaethylporphine and tetraphenylporphineSongzhou Hu and Thomas G. SpiroCite this: J. Am. Chem. Soc. 1993, 115, 25, 12029–12034Publication Date…
Abstract An exact expression for the elastic energy associated with a semicircular shear dislocation loop emanating from a free surface is derived (within continuum dislocation theory) and compared with an earlier approximation. The energy required to activate a semicircular dislocation loop into its unstable “saddle‐…
Pyruvate formate-lyase is a radical-containing enzyme that catalyzes the nonoxidative cleavage of pyruvate via a postulated homolytic mechanism. The formation of this enzymic radical in vitro requires an activating system composed of PFL-activating enzyme, S-adenosylmethionine, ferrous ion, a reduced flavin, DTT, and…
Abstract.- Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small…
Sm-Fe-N permanent magnets have been prepared by mechanical alloying of Sm and Fe powder and subsequently treating the material in a two-step process. Measurements of the minor hysteresis loops and of the initial magnetization curve were performed at room temperature. The reversible susceptibility (χrev), the total sus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanol synthesis: reaction of hexaphenylcyclotrisiloxane with organometallic reagentsScott M. Sieburth and Weilin MuCite this: J. Org. Chem. 1993, 58, 26, 7584–7586Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 Dec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFT-IR study of polymorphic transformations in SOS, POP, and POSJunko Yano, Satoru Ueno, Kiyotaka Sato, Toshiharu Arishima, Nobuo Sagi, Fumitoshi Kaneko, and Masamichi KobayashiCite this: J. Phys. Chem. 1993, 97, 49, 12967–12973Publication Date (Print):December 1, 1993Publica…