Materials Literature
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Silicon oxynitride ceramics were reaction sintered and fully densified by hot isostatic pressing in the temperature range 1700°C to 1950°C from an equimolar mixture of silicon nitride and silica powders without additives. Conversion to Si 2 N 2 O increases steeply from a level around 5% of the crystalline phases at 17…
The surfaces of Ti-Zr alloys before and after immersion in an electrolyte which contains inorganic ions found in the biological system were characterized using X-ray photoelectron spectroscopy (XPS), in order to know the changes in the surfaces of the system. Plates of Ti-25Zr, Ti-50Zr, Ti-60Zr, and Ti-75Zr alloys (in…
Abstract The effect of dopants and level of doping on the thermal stability of polypyrrole at 90, 120 and 150°C in dry air and nitrogen was investigated by monitoring the decay of conductivity. Polymers doped with aromatic anions ( p ‐toluene sulphonate and p ‐chlorobenzene sulphonate) exhibit better stability than po…
The body distribution of surfactant-coated and non-coated poly(methyl methacrylate) nanoparticles with a size of 131 +/- 30 nm after intravenous injection into rats was investigated. The coating materials were poloxamine 904, poloxamine 908, poloxamine 1508, poloxamer 338, and Brij 35. These materials were preselected…
Abstract The crude extract of the stembark of Streblus asper , a traditionally used medicinal plant of India, revealed significant macrofilaricidal activity against Litomosoides carinii and Brugia malayi in rodents. The study revealed two cardiac glycosides, K029 (asperoside) and K030 (strebloside) of the extract to b…
The article presents recent developments and future trends in high Cr ferritic heat resistant steels. Research programs are underway worldwide to improve the performance of 8 to 13% Cr ferritic steels for high temperature applications of up to 650°C. We developed the super 12% Cr heat resistant steel called TAF steel…
The effect of drop (bubble) size on contact angle was examined over a wide range of drop (bubble) sizes for the CCl4-toluene solution/NaCl aqueous solution/quartz, ethylene gtycol/CCI4-toluene solution/quartz, bitumen/ Na5P3O10 aqueous solution/quartz, water/kerosene/quartz, heptane/water/quartz, and air bubble/water/…
The longitudinal and transverse relaxation times of the proton resonances of three lanthanide(III) complexes of 1,4,7,10-tetraazacyclododecane-N,N′,N″,N′″-tetraacetate have been measured. This allows determination of the metal–proton distances and the electronic relaxation times of the paramagnetic metal ions by explo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of excited-state and ground-state redox properties of polyoxometalates for selective transformation of unactivated carbon-hydrogen centers remote from the functional group in ketonesLucille A. Combs-Walker and Craig L. HillCite this: J. Am. Chem. Soc. 1992, 114, 3, 938–9…
The morphology and mineralogy of corrosion products found on copper and silver artifacts recovered from shallow land or water burial are reviewed. Stability diagrams are used to interpret mechanisms for corrosion phenomena with an emphasis on identification of microbiological action.
Abstract The dispersion of carbon black agglomerates within melts of polystyrene and high density polyethylene has been investigated. Analysis of the evolution of the fragment size distribution indicates that a coarse rupturing of the agglomerates occurs during the early stages of the dispersion. This is followed by a…
Four acyl-phloroglucinol derivatives showing antiviral activity have been isolated from Kunzea sinclairii and Kunzea ericoides (Myrtaceae) from New Zealand. The structures of these compounds were deduced from analysis of spectral data. Two of these compounds, 1 and 2, are the isomers of isobutyryl methoxyresorcinol. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent effects on the photochemistry of a ketocyanine dye and its functional analog. Michler's ketoneMary V. Barnabas, An Dong Liu, A. D. Trifunac, Vadim V. Krongauz, and C. T. ChangCite this: J. Phys. Chem. 1992, 96, 1, 212–217Publication Date (Print):January 1, 1992Public…
Several macroscopic physical properties of mineralized turkey leg tendon were measured including wet density, composition, volume fractions of the major components, sonic velocity in three axes, longitudinal modulus and dimensional changes on drying. Where possible the properties were related to density. Typically the…
A number of techniques have been reported to estimate condition index in oysters and other bivalve molluscs. We report and compare condition index, estimated by three different methods, for oysters collected from a single reef in the James River, Virginia over a four week period in the summer of 1987. Two indices expr…
Chitin is a relatively intractable polymer and despite its structural similarity to cellulose it is insoluble in typical cellulose solvents such as cuprammonium hydroxide (Schweizer's reagent), cupriethylene diamine and Cadoxen. However there are a limited number of solvent systems which may be grouped together in thr…
The authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification. Favourably oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Nd-rich liquid grain boundary phase, forming large platelet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of triethylsiloxy-substituted alumoxanes: their structural relationship to the minerals boehmite and diasporeAllen W. Apblett, Alison C. Warren, and Andrew R. BarronCite this: Chem. Mater. 1992, 4, 1, 167–182Publication Date (Print):January 1,…
Grain defect formation during solidification of <OOl> nickel base single crystals has been studied in a series of alloys over a wide range of imposed thermal gradients and growth rates. Solute-driven convective instabilities, associated with high levels of Re and W and/or low levels of Ta, promote the formation of "fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel thermoset polyimidazole amidesYing Hung SoCite this: Macromolecules 1992, 25, 2, 516–520Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00028a003https://doi.org/10.…