Materials Literature
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Deposition of α‐Si 3 N 4 from SiF 4 and NH 3 was systematically studied using an axisymmetric, vertical hot‐wall reactor in the temperature range of 1340° to 1490°C. The relationship between process variables and deposition behavior was identified. The deposition process was most strongly influenced by temperature. In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural changes upon annealing in a deformed styrene-butadiene-styrene triblock copolymer as revealed by infrared dichroismYue ZhaoCite this: Macromolecules 1992, 25, 18, 4705–4711Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of an nitrogen-nitrogen chelate ligand on the insertion reactions of carbon monoxide into a manganese-alkyl bondFrancisco J. Garcia Alonso, Angela Llamazares, Victor Riera, Marilin Vivanco, Santiago Garcia Granda, and Maria R. DiazCite this: Organometallics 1992, 11,…
Abstract A series of reduced-charge (RC) hectorites were prepared by multiple heat (250°C) treatments of Mg-saturated hectorites (SHCa-1 ). Cation exchange capacity (CEC) measurements and alkylammonium exchange indicated that a decrease in layer charge occurred with each Mg-250 treatment. Chemical analyses showed that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModified Joback group contribution method for normal boiling point of aliphatic halogenated compoundsSukumar Devotta and V. Rao PendyalaCite this: Ind. Eng. Chem. Res. 1992, 31, 8, 2042–2046Publication Date (Print):August 1, 1992Publication History Published online1 May 2002…
Calcium commonly accumulates on granular activated carbon (GAC), and when it is chelated by natural organic matter (NOM), it is drawn into the pores of the GAC. Internally loaded calcium greatly catalyzes regeneration reactions, leading to accelerated internal mass loss. Optimal conditions for the regeneration of a GA…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPractical use of concentration-dependent contact angles as a measure of solid-liquid adsorption. 2. Experimental aspectsErwin A. VoglerCite this: Langmuir 1992, 8, 8, 2013–2020Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inis…
The complete amino acid sequence of human heart (R)-3-hydroxybutyrate dehydrogenase (EC 1.1.1.30) has been deduced from the nucleotide sequence of cDNA clones. This mitochondrial enzyme has an absolute and specific requirement of phosphatidylcholine for enzymic activity (allosteric activator) and is an important proto…
A simple subjective test method is described to evaluate the prickliness of fabric samples, and its reproducibility and consistency are assessed. The test is used to evaluate the prickliness of a set of wool knitted samples covering a range of fiber diameters. The finer (19 micron) wool samples are nonprickly, and pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic chemistry on a polyimide surfaceRichard R. Thomas, Stephen L. Buchwalter, L. Paivikki Buchwalter, and Taina H. ChaoCite this: Macromolecules 1992, 25, 18, 4559–4568Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic isomerization of azobenzene moieties compartmentalized in hydrophobic microdomains in a microphase structure of amphiphilic polyelectrolytesYotaro Morishima, Makoto Tsuji, Mikiharu Kamachi, and Koichi HatadaCite this: Macromolecules 1992, 25, 17, 4406–4410Public…
We report on the experimental observation of a different type of focal conic domain with positive Gaussian curvature. A particular type of these domains is usually given the name ``spherulites.'' Their appearance is due to a low (probably negative) value of the saddle-splay elastic constant. These domains are observed…
The catalytic decomposition of ozone on an α-Fe2O3 catalyst has been investigated within the temperature range 23-65°C. A high initial decomposition degree followed by a decrease is observed. It is found that the water vapor in the air-ozone mixture exercises almost no effect on the process. IR-spectroscopy has shown…
Transmission formulas and transmission curves of birefringent filters when the optic axis is not in the plane of the filter plates are given and discussed in detail. The optimum parameters of birefringent filters, such as the most suitable ratio of thicknesses, tuning angles, and plate thicknesses, are obtained. As fa…
Abstract Equilbrium isotherms are reported for adsorption of water vapour on several different activated alumina adsorbents. The experimentally measured isotherms represent the sum of the contributions from water vapour held in several ways but these contributions can be resolved by detailed analysis. The individual i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigin of excess light scattering in poly(methyl methacrylate) glassesYasuhiro Koike, Shiro Matsuoka, and Harvey E. BairCite this: Macromolecules 1992, 25, 18, 4807–4815Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 A…
ABSTRACT The species of the genus Chlorella exhibit considerable biochemical and physiological differences. Therefore, it is important to select for and utilize in research or biotechnology correctly identified strains of the species having the most favorable properties for the respective project. We examined the Chlo…
Conformations and electronic structures of polymers based on polythiophene with various fused fragments were theoretically investigated. Thioethylenic, thiodimethylenic, and ethylenic fragments were explored, yielding polythieno(3,4-b)thiophene, polythieno(3,4-c)thiophene, and poly(3- thiabicyclo(3.2.0)-1,4,6-heptatri…
Bacillus megaterium is known to have several genes that code for isozymes of glucose dehydrogenase. Two of them, gdhI and gdhII, were cloned from B. megaterium IAM1030 in our previous work (T. Mitamura, R. V. Evora, T. Nakai, Y. Makino, S. Negoro, I. Urabe, and H. Okada, J. Ferment. Bioeng. 70:363-369, 1990). In the p…
The same integrated intensity is observed for the interface-PC signal in PC(13C)/PS(12C/*) and PC(13C)/PS(2D/*) thin film blends in a DNP-difference experiment. This result proves that the dominant mechanism of polarization transfer from the electrons in the PS phase to the protons in the PC phase is by direct polariz…