Materials Literature
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A wide range of ceramic coatings has been deposited on metal substrates by a reaction occurring during dielectric breakdown at the anode surface in an electrochemical cell, which is accompanied by visible sparking at the anode/electrolyte interface. While the majority of work reported has been on oxide coatings deposi…
Recent developments in instrumentation for electron energy loss spectroscopy (EELS) at Gatan R&D are reviewed. A 10-channel intrinsic Si detector with single-electron detection capa- bility is being developed for fast energy-filtered imaging and elemental mapping in the STEM mode. A new type of an imaging filter…
Interferometric measurements of saturation of the nonlinear index of refraction in a semiconductor-doped glass (Schott OG 550) are reported. The index change, measured at a wavelength of 532 nm, reaches a maximum value of ~1.5 × 10−4 at high intensity. It is shown that the magnitude of the corresponding third-order su…
Simulataneous additions of SrO and Al 2 O 3 to ZrO 2 (12 mol% CeO 2 ) lead to the in situ formation of strontium aluminate (SrO · 6Al 2 O 3 ) platelets (∼0.5 μm in width and 5 to 10 μm in length) within the Ce‐TZP matrix. These platelet‐containing Ce‐TZP ceramics have the strength (500 to 700 MPa) and hardness (13 to…
The mechanical properties of wood flour/polypropylene composites may be improved by using coupling agents to enhance the bonding between filler and matrix. We used a two-level, full-factorial experiment to examine the effectiveness of a commercially available additive, Epolene E-43, on strength (tensile, flexural, and…
Many of the problems associated with conventional drug therapy may be circumvented by the use of delivery systems which, in a variety of ways, will optimize drug action. Among the systems being investigated, liposomes hold considerable promise. Versatility in both the structural characteristics of liposomes and their…
Abstract
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.