Materials Literature
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Abstract Ca-K.-, Na-K-, and Ca-Na-exchange isotherms on four reference smectites were studied. The electric charge on the four smectites was due predominantly to cationic substitution in the octahedral layer and varied between 90 and 122 meq/g (cmole(+)/kg) clay. The affinity of the clays for K increased with a decrea…
Abstract The relation between the dynamic mechanical properties and the morphology of polypropylene (PP) block copolymers and polypropylene/elastomer blends was studied by dynamic mechanical analysis (DMA), light‐ and electron microscopy. The latter techniques contributed to an improvement in assignments of relaxation…
The bias‐dependent etching of Si in has been studied in detail. The quantity of Si etched and evolved has been measured at various anodic and cathodic potentials. These quantities have been related to the current flow in the electrochemical cell in such a way as to shed light on the mechanisms responsible for bias‐dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkylation and silylation of the aluminum enolates generated by hydroalumination of .alpha.,.beta.-unsaturated carbonyl compoundsTetsuo Tsuda, Hiroshi Satomi, Toshio Hayashi, and Takeo SaegusaCite this: J. Org. Chem. 1987, 52, 3, 439–443Publication Date (Print):February 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of (5,10,15,20-tetraphenylporphyrinato)iron(III) halide complexes, Fe(TPP)(X)David N. Hendrickson, Michael G. Kinnaird, and Kenneth S. SuslickCite this: J. Am. Chem. Soc. 1987, 109, 4, 1243–1244Publication Date (Print):February 1, 1987Publication History Publi…
Solid-state 13 C CPMAS NMR was used to examine organic soils from virgin, 5-yr and 15-yr cultivated sites. In agreement with previous studies using other techniques, the chemical effects of cultivation were essentially confined to the plough layer. Cultivated sites had less carbohydrate, and increased lipid and methox…
In 1979 ICRU recommended the value W=(33.85+or-0.05) eV for the average energy required for electrons to produce an ion pair in dry air. A re-evaluation is presented which is based on recently published stopping-power data. The new result is W/e=(33.97+or-0.05) JC -1 , where all stated uncertainties are estimated stan…
SiC single crystals of 6H polytype were plastically deformed by uniaxial compression at a constant strain rate at temperatures between 1100 and 1800°C, and their critical resolved shear stress τc and strain-rate sensitivity were measured as a function of temperature. The flow rate [ydot] was found to be expressible in…
The strength, fracture toughness, and oxidation behavior of a hot-pressed SiC-TiB/sub 2/ composite (with B and C additions) were investigated. Adding 15 vol% TiB/sub 2/ to an SiC matrix increased the mean strength and mean fracture toughness of the composite by 28% and 45%, respectively. Oxidation of the SiC-15-vol%-T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrientation dynamics of main-chain liquid crystal polymers. 2. Structure and kinetics in a magnetic fieldJ. S. Moore and S. I. StuppCite this: Macromolecules 1987, 20, 2, 282–293Publication Date (Print):February 1, 1987Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDual-mode transport of molecular oxygen in a membrane containing a cobalt porphyrin complex as a fixed carrierHiroyuki. Nishide, Manshi. Ohyanagi, Osamu. Okada, and Eishun. TsuchidaCite this: Macromolecules 1987, 20, 2, 417–422Publication Date (Print):February 1, 1987Publica…
We present an analytic solution of the problem of velocity selection in a fully nonlocal model of dendritic crystal growth. Our analysis uses a WKB technique to derive and evaluate a solvability condition for the existence of steady-state needlelike solidification fronts in the limit of small undercooling \ensuremath{…
Aluminum titanate solid solutions with empirical formulas of Al 2 Ti 1‐x Zr x O 5 , Al 6(2‐x)(6+x) Si 6x/(6+x) □ 6x/(6+x) TiO 5 , and Al 2(1‐x) Mg x Ti 1+x O 5 were synthesized by reaction sintering and annealed at 900° to 1300°C in air to evaluate the thermal stability. Substitution of Al in Al 2 TiO 5 by Si and 2Al…
The effects of TiB/sub 2/ addition to ..cap alpha..-SiC on mechanical, thermal, and electrical behavior were determined. The reliability of ceramics for structural applications is, in general, limited by variability in mechanical strength and low toughness. Property variability is normally attributed to processing- or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge separation in carotenoporphyrin-quinone triads: synthetic, conformational, and fluorescence lifetime studiesDevens Gust, Thomas A. Moore, Paul A. Liddell, Gregory A. Nemeth, Lewis R. Makings, Ana L. Moore, Donna Barrett, Peter J. Pessiki, Rene V. Bensasson, and Cite t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleAnion-exchanged clay (hydrotalcite-like compounds) modified electrodesKingo Itaya, Hsien Chang Chang, and Isamu UchidaCite this: Inorg. Chem. 1987, 26, 4, 624–626Publication Date (Print):February 25, 1987Publication History Published online1 May 2002Published inissue 25 February…
The surface phases of a nematic liquid in the presence of a smooth substrate are studied using Landau--de Gennes theory. The alignment of the nematic director is restricted to be either parallel or perpendicular to the substrate, although methods of treating more general structures are indicated. We describe extension…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe (phthalocyaninato)copper iodide complex Cu(pc)I: a molecular metal with a one-dimensional array of local moments embedded in a "Fermi sea" of charge carriersMichael Y. Ogawa, Jens Martinsen, Sharon M. Palmer, Judith L. Stanton, Jiro Tanaka, Richard L. Greene, Brian M. Ho…
Chemical reactions require that at least two molecules or reacting groups come into close proximity so that energy, electrical charge, or chemical groups may be exchanged between them. The process of bimolecular reaction between A and B is given by Eq. (1), taking into account the diffusion step bringing the two react…
Abstract We report attempts to create conjugated polymers consisting of alternating phenylene and heterocyclic rings separated by double bonds by means of condensations between terephthalaldehyde and dimethyl nitrogen bases. Because the products precipitated during their formation even at 180°C in N‐methyl‐2‐pyrrolidi…