Materials Literature
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Abstract By considering reaction and diffusion through a product layer and concomitant movement of pore and reaction surfaces, a general rate equation is derived for fluid‐solid reactions. Application to the random pore model extends the prior results (Bhatia and Perlmutter, 1980, 1981a) to account for nonlinear conce…
The molecular structures, vibrational frequencies, and relative energies of silaacetylene and its vinylidene and silylidene isomers have been investigated via nonempirical molecular electronic theoretical methods.Basis sets of double zeta (DZ) and double zeta (DZ) and double zeta plus d function quality have been usea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffective surfaces of semiconductor catalysts for light-induced heterogeneous reactions evaluated by simultaneous photodeposition of both oxidation and reduction productsTetsuhiko Kobayashi, Yoshikuni Taniguchi, Hiroshi Yoneyama, and Hideo TamuraCite this: J. Phys. Chem. 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibility of ethylene-vinyl acetate copolymers with chlorinated polyethylenes. 1. Compatibility and its variation with temperatureD. J. Walsh, Julia S. Higgins, and S. RostamiCite this: Macromolecules 1983, 16, 3, 388–391Publication Date (Print):March 1, 1983Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPericyclic reactions of vinylallenes: from calciferols to retinoids and drimanesWilliam H. OkamuraCite this: Acc. Chem. Res. 1983, 16, 3, 81–88Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983https://pubs.acs.o…
An investigation of the Debye relaxations in WO3 and W x MO1−x O3 confirm the mechanism of polaronic conduction at low temperatures. The Mo positions act as trapping centres, and the relaxation times and activation energies depend largely on the crystallinity of the samples, Polarons are spin-paired in the ground stat…
Extracts of Bacillus sphaericus NCTC 9602 catalysed the formation of meso-diaminopimelate from aspartic β-semialdehyde plus pyruvate, or from dihydrodipicolinate, even though no activities of tetrahydrodipicolinate acetylase (or succinylase) nor N-acetyl-(or N-succinyl-)ll-diaminopimelate deacylase nor diaminopimelate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleCrescent-shaped dinuclear complexes: a dirhodium(II) complex of the new tetradentate ligand 2,7-bis(2-pyridyl)-1,8-naphthyridine (bpnp), [Rh2(bpnp)(.mu.-CH3CO2)3](PF6)Wayne R. Tikkanen, E. Binamira-Soriaga, William C. Kaska, and Peter C. FordCite this: Inorg. Chem. 1983, 22, 7,…
(1983). On the Compression Characteristics of Fibre Masses. The Journal of The Textile Institute: Vol. 74, No. 2, pp. 92-97.
Abstract The rheological behavior of highly filled polymer melts has been examined. At concentrations near the maximum packing fraction, strain‐dependent behavior was observed at strains as low as 1 percent. Selected surface treatments were shown to reduce particle agglomeration. This produced composite melts with low…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic field and magnetic isotope effects on photoinduced emulsion polymerizationNicholas J. Turro, Ming Fea Chow, Chao Jen Chung, and Chen Ho TungCite this: J. Am. Chem. Soc. 1983, 105, 6, 1572–1577Publication Date (Print):March 1, 1983Publication History Published online…
The equations governing melt stability during solidification of a binary alloy are shown to resemble those characterizing the Bénard problem with permeable boundaries. Critical conditions for the onset of stationary convection are calculated for the case of a planar interface. Long wavelength modes are preferred when…
Mixed-valence vanadium pentoxide gels have been obtained by polymerization of vanadic acid. They exhibit semiconducting properties which arise from electron hopping between VIV and Vv ions. Such gels can easily be deposited onto a substrate, giving layers of high electrical conductivity (σ =0.l Ω−1 cm−1 at 300 K). The…
The interactive effects between ductile iron and PNL 76–68 borosilicate glass were investigated as a function of time in 90°C static deionized, tuff, and basalt groundwaters. A syn‐ergistic effect occurs between the two materials, i. e. iron enhances glass dissolution and glass enhances iron corrosion. An iron silicat…
Abstract An investigation of the Urbach rule in crystalline SiO 2 (α‐quartz), crystalline SiO 2 Ge, and vitreous SiO 2 in the framework of the models of Dow and Redfield and of Toyozawa shows that the fundamental optical absorption edge of SiO 2 is determined by strong exciton–phonon interactions. In the crystalline…
Summary Soil from a field under long‐term grass was treated with 0.02 m sodium periodate for various periods up to 1176 h, followed by 0.1 d sodium tetraborate for 6 h. This destroyed an increasing proportion of microaggregates >45 μm and carbohydrate. After periodate treatment for 6 h about 70% of the soil sugars…
Abstract Poly(4‐hydroxybenzoate) was prepared under a variety of reaction conditions. In addition to using the well‐known monomers 4‐acetoxybenzoic acid and phenyl 4‐hydroxybenzoate, p ‐tolyl 4‐hydroxybenzoate, 4‐pivaloyloxybenzoic acid, and 4‐trimethylsiloxybenzoyl chloride were also condensed. A new routine method f…
(Rp)- and (Sp)-5'-O-thymidyl 3'-O-thymidyl [18O]phosphates have been synthesized by reaction of the respective (Sp)- and (Rp)-phosphorothioate precursors with N-bromosuccinimide in dioxane and H218O. Stereochemical analysis of the product derived from the (Rp)-phosphorothioate by digestion with snake venom phosphodies…
Abstract Blends of poly(butylene terephthalate) (PBT) and a copolyester of bisphenol‐A with 50% terephthalate‐50% isophthalate (PAr), before and after transesterification, have been studied by thermal and dynamic mechanical tests to determine crystallinity and phase behavior. Blends without transesterification, as pre…
Abstract Gortdrumite superficially resembles chalcocite but is more distinctly anisotropic, and is present in a vein containing ferroan dolomite and baryte which cuts dolomitized limestones from the Gortdrum Orebody of County Tipperary, Ireland. It has an empirical formula of approximately (Cu,Fe) 6 Hg 2 S 5 . A disti…