Materials Literature
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Hydrogen permeation characteristics of palladium-plated vanadium and vanadium-nickel alloy membranes have been investigated using gas permeation technique in the temperature range 423–673 K and in the hydrogen pressure range 1×104−3×105 Pa. Hydrogen solubilities of vanadium-nickel alloys have been determined using a v…
The crystallization kinetics of a 40Li 2 O · 60SiO 2 (mol%) glass were studied using DTA and both isothermal and nonisothermal DSC techniques as a function of (1) particle size of the glass powder, (2) crucible material, e.g., alumina or platinum, (3) furnace atmosphere, e.g., nitrogen, oxygen, or argon, and (4) surfa…
A new model of the geometrical structure of icosahedral quasicrystals is discussed that is based on icosahedral clusters connected by linkages (consistent with currently accepted motifs of the atomic structure), yet that is also a tiling by four kinds of ``canonical cells.'' Such a geometry is convenient for complete…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of peptides: preferential N-terminal adsorption on colloidal silverTonya M. Herne, Angela Ahern, and Robin L. GarrellCite this: J. Am. Chem. Soc. 1991, 113, 3, 846–854Publication Date (Print):January 1, 1991Publication History Published on…
The interaction of the mono- and triglutamate forms of 5-methyltetrahydrofolate and 5-formyltetrahydrofolate with serine hydroxymethyltransferase were determined by several methods. These methods included: determining dissociation constants by observing the absorbance at 502 nm of a ternary complex of the enzyme, glyc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroscopic and macroscopic thermodynamic observations in swollen poly(dimethylsiloxane) networksSimon Mallam, Ferenc Horkay, Anne Marie Hecht, Adrian R. Rennie, and Erik GeisslerCite this: Macromolecules 1991, 24, 2, 543–548Publication Date (Print):January 1, 1991Publicatio…
The 12-molybdo(tungsto)phosphoric acids, and the related compounds 1-vanado-11-molybdo(tungsto)phosphoric acids, all having the Keggin structure, have been studied at different temperatures in a special infrared cell allowing experiments in a controlled atmosphere. The effects of dehydration and the thermal stability…
The colloidal fibrils of polyaniline–poly(acrylic acid) complex were first synthesized by template guided chemical polymerization; their morphology and the electronic absorption spectra in aqueous solution are reported.
Continuum representations of micromechanical phenomena in structured materials are described, with emphasis on cellular solids. These phenomena are interpreted in light of Cosserat elasticity, a generalized continuum theory which admits degrees of freedom not present in classical elasticity. These are the rotation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular semiconductors from bifunctional dithia- and diselenadiazolyl radicals. Preparation and solid-state structural and electronic properties of 1,4-[(E2N2C)C6H4(CN2E2)] (E = sulfur, selenium)A. Wallace Cordes, Robert C. Haddon, Richard T. Oakley, Lynn F. Schneemeyer, J…
Suspensions of colloidal particles execute Brownian motion and thus exhibit thermodynamic properties analogous to those of molecular systems. Hard-sphere colloidal silica suspensions undergo a disorder–order transition, i.e. freezing or crystallization, at high volume fractions. In suspensions of small particles the s…
Abstract The ability to control charge nature, charge density and molecular weight enables the polymer chemist to design polyelectrolytes to provide a wide variety of functions, essential in many industrial processes. The flexibility of polymer design is summarised.
The powerful π-electron donor, tetrathiafulvalene, forms a strong green-coloured 1 : 1 complex with the π-electron accepting tetracationic cyclophane, cyclobis(Paraquat-p-phenylene), in both the solid and solution states as demonstrated by X-ray crystallography and spectroscopy (NMR and UV–VIS), respectively.
A breakdown mechanism is proposed in which a filamentary-shaped crack propagates through a dielectric, releasing both electrostatic energy and electromechanical strain energy stored in the material due to the applied electric field. The mechanism predicts a breakdown strength which is proportional to the fourth root o…
An immunohistochemical analysis of the eggshell membranes shows the occurrence of type X collagen while type I collagen was not detected by using an appropriate monoclonal antibody with untreated shell membranes. A positive immuno-reaction for type I collagen was obtained after digestion of the shell membranes with pe…
The magnetic properties and resistivities of the ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NiO}}_{4}$ solid solution have been investigated with particular emphasis on conductive materials near ${\mathrm{LaSrNiO}}_{4}$. Near that composition, weakly temperature-dependent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn asymmetric synthesis of MK-0417. Observations on oxazaborolidine-catalyzed reductionsTodd K. Jones, Julie J. Mohan, Lyndon C. Xavier, Thomas J. Blacklock, David J. Mathre, Paul Sohar, E. Tracy Turner Jones, Robert A. Reamer, F. E. Roberts, and E. J. J. GrabowskiCite this:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvated metal atom dispersed catalystsKenneth J. Klabunde, Yong Xi Li, and Beng Jit TanCite this: Chem. Mater. 1991, 3, 1, 30–39Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.…
ABSTRACTPublished methods for production of homogeneous edible films from com and wheat proteins were adapted. Barrier and mechanical properties of the edible films were evaluated with procedures commonly used on polymeric films. Mechanical property data included thickness, elongation, tensile strength, tear strength,…
Thermal stabilities of E′, Al, and Ti centers in quartz from the Mannari granite were investigated by electron spin resonance (ESR) with isothermal and isochronal annealing experiments. Second order decay kinetics best explain the results. The closure temperatures at which the ESR clocks start were estimated to be 91°…