Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSite-specific reversible scission of hydrogen bonds in polymers: an investigation of polyamides and their Lewis acid-base complexes by infrared spectroscopyMichael F. Roberts and Samson A. JenekheCite this: Macromolecules 1991, 24, 11, 3142–3146Publication Date (Print):May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA reexamination of the chemisorption of trimethylaluminum on silicaM. E. Bartram, T. A. Michalske, and J. W. Rogers Jr.Cite this: J. Phys. Chem. 1991, 95, 11, 4453–4463Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1…
Rates of thermal decomposition and solvent rate effects have been measured for a series of nitrate esters. The alkoxy radicals formed by homolysis together with some of their further degradation products have been stabilized by hydrogen donation. Internal and external return of nitrogen dioxide has been demonstrated b…
Sm2Fe17N3−δ is a promising permanent magnet material but disproportionation above 650 °C means that only low-temperature processing can be considered. Sintering micron-size Sm2Fe17N3−δ powder with the soft, low-melting metals Zn, Bi, Sn, and Al has been investigated. Good results are obtained with zinc. A coercivity o…
Theoretical analysis of solid oxide fuel cells (SOFCs) using two‐layer, composite electrolytes consisting of a solid electrolyte of a significantly higher conductivity compared to zirconia (such as ceria or bismuth oxide) with a thin layer of zirconia or thoria on the fuel side is presented. Electrochemical transport…
Abstract Cation‐exchange capacity (CEC) is an important soil property in describing nutrient availability for plant growth. Measurements of CEC, however, are often not available or have been measured using different analytical methods. The need, therefore, exists to develop alternative procedures to predict CEC from a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemically-induced charge and mass transport in polypyrrole/poly(styrene sulfonate) molecular compositesCharles K. Baker, Yong Jian Qiu, and John R. ReynoldsCite this: J. Phys. Chem. 1991, 95, 11, 4446–4452Publication Date (Print):May 1, 1991Publication History Publis…
Mechanical and electrical properties of nanocomposite materials composed of a Si 3 N 4 matrix and nanometer‐sized SiC particles are described. Composites containing less than 10 vol% SiC particles have the same order of resistivity and dielectricity as the non‐SiC material as well as highly improved mechanical propert…
The electron beam of a scanning electron microscope (SEM) is used to charge an unmetallized insulator (Al2O3, Y2O3, SiO2) in vacuum. The charging is found to be stable in time after the e-beam is switched off. The SEM is also used to measure the implanted charge by measuring the resulting electrostatic potential. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution aluminum-27 and silicon-29 MAS NMR investigation of silica-alumina glassesR. K. Sato, P. F. McMillan, P. Dennison, and R. DupreeCite this: J. Phys. Chem. 1991, 95, 11, 4483–4489Publication Date (Print):May 1, 1991Publication History Published online1 May 2002…
An ellipsoid shell consisting of 30 linked tetragonal VO5, pyramids surrounding a distorted {V4O4}O4 cube-this is one way to describe the title compound (right: solid circles, V; empty circles, O). This cluster is not only of topological interest, however. Its magnetic properties make it a molecular model of the monoc…
The nucleation and crystallization of the Na 2 O · 2CaO · 3SiO 2 (NC 2 S 3 ) glass were studied by differential thermal analysis (DTA), and a (nucleation rate—temperature)‐like curve was determined by plotting either the reciprocal of the temperature corresponding to the crystallization peak maximum, 1/ T p , or the h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of monolith catalysts for power plant nitrogen oxide (No.+-.) emission controlJean W. Beeckman and L. Louis HegedusCite this: Ind. Eng. Chem. Res. 1991, 30, 5, 969–978Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacroscopic and microscopic thermodynamic observations in swollen poly(vinyl acetate) networksFerenc Horkay, Anne Marie Hecht, Simon Mallam, Erik Geissler, and Adrian R. RennieCite this: Macromolecules 1991, 24, 10, 2896–2902Publication Date (Print):May 1, 1991Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of polypyrrole synthesized with oxidative iron(III) saltsE. T. Kang, K. G. Neoh, Y. K. Ong, K. L. Tan, and B. T. G. TanCite this: Macromolecules 1991, 24, 10, 2822–2828Publication Date (Print):May 1, 1991Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew high-refractive-index organic/inorganic hybrid materials from sol-gel processingB. Wang, G. L. Wilkes, J. C. Hedrick, S. C. Liptak, and J. E. McGrathCite this: Macromolecules 1991, 24, 11, 3449–3450Publication Date (Print):May 1, 1991Publication History Published online1…
Tryptophan synthase, an alpha 2 beta 2 complex, is a classic example of an enzyme that is thought to "channel" a metabolic intermediate (indole) from the active site of the alpha subunit to the active site of the beta subunit. We now examine the kinetics of substrate channeling by tryptophan synthase directly by chemi…
Abstract An analysis of available methods of dealing with polymer crystallization for process modeling is presented. Problems encountered in using isothermal data to predict nonisothermal results are discussed and illustrated using experimental data for nylon 6. A half‐time analysis is used to evaluate and extrapolate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis[3-tert-butyl-5-(N-oxy-tert-butylamino)phenyl] nitroxide in a quartet ground state: a prototype for persistent high-spin poly[(oxyimino)-1,3-phenylenes]Takayuki Ishida and Hiizu IwamuraCite this: J. Am. Chem. Soc. 1991, 113, 11, 4238–4241Publication Date (Print):May 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtropisomer-specific formation of premicellar porphyrin J-aggregates in aqueous surfactant solutionsDavid C. Barber, Ruth A. Freitag-Beeston, and David G. WhittenCite this: J. Phys. Chem. 1991, 95, 10, 4074–4086Publication Date (Print):May 1, 1991Publication History Publishe…