Materials Literature
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Visual observations and preliminary light scattering experiments on the crystallization process in various colloidal systems are reported. In the first place we studied the influence of the stabilizing coating of the colloidal particles on the rate of crystallization. The various coatings give rise to different ranges…
Three new rare earth–iron ternary compounds with the La6Ga3Co11 structure (I4/mcm), Pr6Ga3Fe11, Nd6Ga3Fe11, and Sm6Ga3Fe11, are found to be ferromagnetic with Curie temperatures of 320, 397, and 462 K, respectively. Large anisotropies have been observed from the magnetization curves and the anisotropy field is larger…
Abstract Cyclic voltammograms of Me(GeMe2)nMe n = 2–6 and (GeMe2)6 were recorded. The data showed that HOMO moves up more largely than LUMO moves down as the polygermane chain elongates. UV spectra were also measured. Examination of UV data and the oxidation potentials for Me(GeMe2)6Me and (GeMe2)6 suggested that (GeM…
Abstract The colloidal dispersions of the palladium–platinum bimetallic clusters were prepared by refluxing their salts in water/ethanol in the presence of poly(N-vinyl-2-pyrrolidone) under nitrogen. They work as catalysts for partial hydrogenation of diene. The highest activity was achieved by the bimetallic clusters…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions as soluble metal oxide analogs. 6. Catalytic activity and initial kinetic and mechanistic studies of polyoxoanion-supported, atomically dispersed iridium(I), (1,5-COD)Ir.cntdot.P2W15Nb3O628-David K. Lyon and Richard G. FinkeCite this: Inorg. Chem. 1990, 29, 10,…
Abstract Growth and dissolution of succinic acid crystals have been studied in an isothermal stirred tank crystallizer. Seeded desupersaturation and deundersaturation experiments have been performed. Parameters of a desired growth rate equation are estimated by fitting the supersaturation balance equation directly to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA model for nematic and columnar ordering in a self-assembling systemMark P. Taylor and Judith HerzfeldCite this: Langmuir 1990, 6, 5, 911–915Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs.acs.org/do…
The problems involved in preparing well-defined metal oxide surfaces are well known. We are investigating low power rf oxygen plasma treatment as a method for producing metal oxide surfaces of controlled stoichiometry and structure. The effects of exposing a 300 K oxygen deficient SnO2(110)−4×1 surface to an oxygen pl…
Amorphous thin films are obtained from the thermal oxidation in air at 300°C of magnetron‐sputtered on transparent electrodes. Their optical transmittance is of the order of 80% in the visible wavelength range, and their optical gap is 3.9 eV. Quality of oxide films is directed by the density of the initial film. Elec…
The initial probability of dissociative chemisorption Pr of methane and ethane on the highly corrugated, reconstructed Pt(110)-(1×2) surface has been measured in a microreactor by counting the number of carbon atoms on the surface following the reaction of methane and ethane on the surface which was held at various co…
Colloidal suspensions of charged latex microspheres in water exhibit liquid-like or crystalline ordering depending on particle interaction and concentration. By virtue of large particle spacing and slow dynamics, colloidal systems offer a unique opportunity to study interfacial structure and dynamics. This paper prese…
The fracture behavior of a polycrystalline alumina was examined at temperatures ranging from ambient through 1400°C, using three‐point bend bar test specimens. R ‐curves were determined at all temperatures studied, and when accompanied by renotching procedures, a wake removal technique, conclusive evidence was provide…
Abstract Silver clusters in aqueous solutions containing excess Ag + ions may be regarded as tiny metal‐electrodes. The electrochemical standard potentials of metal electrode equilibria Ag n ⇆Ag n ‐1 + Ag + + e − are much more negative than that of the compact silver‐metal electrode. The potential generally strives to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleInteractions of water-soluble porphyrins and metalloporphyrins with smectite clay surfacesKathleen A. Carrado and Randall E. WinansCite this: Chem. Mater. 1990, 2, 3, 328–335Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn vitro photodynamic activity of diprotonated sapphyrin: a 22-.pi.-electron pentapyrrolic porphyrin-like macrocycleBhaskar G. Maiya, Mike. Cyr, Anthony. Harriman, and Jonathan L. SesslerCite this: J. Phys. Chem. 1990, 94, 9, 3597–3601Publication Date (Print):May 1, 1990Publ…
Compressive creep of SiC‐whisker‐reinforced Al 2 O 3 composites (0, 5, 15, and 25 wt% SiC) was measured in the temperature range of 1300° to 1500°C in air and argon. The creep resistance increased with increasing whisker concentration. The results indicated that the whiskers degraded in air, increasing strain rates co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving carbocationic polymerization. 31. A comprehensive view of the inifer and living mechanisms in isobutylene polymerizationBela Ivan and Joseph P. KennedyCite this: Macromolecules 1990, 23, 11, 2880–2885Publication Date (Print):May 1, 1990Publication History Published on…
The residual stress state of brazed ceramic/metal compounds is described by means of X‐ray residual stress determinations and analytical calculations using a model of three elastic infinite plates. It is shown that the residual stress state of the soldered compound depends on the materials combination and on the geome…
Four polycomponent systems based on LaCo13 have been studied: La(Co1−xFex)13, La(Co1−xAlx)13, La(Co1−x−yFexAly)13, and La0.7Nd0.3(Co0.7Fe0.3)13. These 1:13 systems were studied because of their potential for permanent magnet fabrication. LaCo13 has a high 3d metal content, the highest for any known rare-earth intermet…
The effects of the 56-kilodalton protease (56K protease) from Serratia marcescens on complement-derived chemotactic activity were examined. Fresh human serum was incubated with zymosan to produce C5a. This activated serum was then incubated with various concentrations of 56K protease, and the chemotactic activity of m…