Materials Literature
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The oxidation behavior and microstructure of the oxidized surfaces of RE 2 Si 2 O 7 –Si 3 N 4 ceramics were investigated. The high oxidation resistance of these materials at 1400°C is attributed to the minimization of amorphous phases via devitrification to disilicates that are in equilibrium with SiO 2 , the oxidatio…
The shear flow behavior of a unidomain nematic solution of poly(n‐hexyl isocyanate) (PHIC) subjected to an electric field was studied experimentally in a parallel plate rotational rheometer. At a shear rate of 0.4 s‐1, the Miesowicz viscosity ηc (with the director oriented along the velocity gradient) was found to be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of single silver nanoclusters within spherical microdomains in block copolymer filmsY. Ng Cheong Chan, R. R. Schrock, and R. E. CohenCite this: J. Am. Chem. Soc. 1992, 114, 18, 7295–7296Publication Date (Print):August 1, 1992Publication History Published online1 Ma…
BACKGROUND: Biomaterial pretreatment with endothelial cell mitogens may enhance endothelialization. METHODS: Modified fibrin glue (FG) containing 1 ng/cm2 recombinant 125I-labeled fibroblast growth factor type 1 (125I-FGF-1), 20 micrograms/cm2 heparin, 2.86 mg/cm2 fibrinogen, and 2.86 x 10(-2) units/cm2 thrombin was p…
The fabrication and intergranular‐phase devitrification of silicon nitride densified with rare‐earth (RE) oxide additives has been investigated. The additions of the oxides of Sm, Gd, Dy, Er, and Yb, having high melting points and behaving similarly to Y 2 O 3 , were compositionally controlled to tailor a microstructu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics of pentachlorophenate degradation in aqueous solution by means of ultrasoundChristian Petrier, Marc Micolle, Gerard Merlin, Jean Louis Luche, and Gilbert ReverdyCite this: Environ. Sci. Technol. 1992, 26, 8, 1639–1642Publication Date (Print):August 1, 1992Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and decomposition of acetylene on silicon(100)-(2.times.1)P. A. Taylor, R. M. Wallace, C. C. Cheng, W. H. Weinberg, M. J. Dresser, W. J. Choyke, and J. T. Yates Jr.Cite this: J. Am. Chem. Soc. 1992, 114, 17, 6754–6760Publication Date (Print):August 1, 1992Publicat…
The High-Temperature Engineering Test Reactor (HTTR) is a 30-MW(thermal) helium gas-cooled reactor with a core composed of prismatic graphite blocks piled on core support structures. Safety analyses have been made for the seismic design of the HTTR core using a two-dimensional seismic analysis code called SONATINA-2V,…
Le terme époxyde désigne une grande variété de prépolymères comportant un ou plusieurs motifs époxydiques qui, après polycondensation avec un durcisseur, conduisant à des produits thermodurcis dont les principales applications concernent le collage et les matériaux composites (matrice époxyde avec d
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…