Materials Literature
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Abstract The exotherms of the reactions leading to the formation of polyurethane foams were measured. The inflection points of the exotherm curves were made evident by continuous differentiation with respect to time. The position and magnitude of the inflection points demonstrated the sequential nature of the reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the nature of other ligands on the rate of nitrito-to-nitro linkage isomerization of octahedral cobalt(III)-amine complexes in aqueous solutionKatsuhiko Miyoshi, Noriko Katoda, and Hayami YonedaCite this: Inorg. Chem. 1983, 22, 13, 1839–1843Publication Date (Print)…
A series of substituted 1,3-diaryltriazenes has been synthesized and tested for anorectic activity. Several members of the series were effective; one compound, 1,3-bis[2-cyano-5-(trifluoromethyl)phenyl]triazene, was particularly active, causing weight loss in rats, dogs, and squirrel monkeys. It was devoid of overt ce…
Abstract A quantitative evaluation of RBS data resulted in data for the parabolic reaction rate constants for the reaction between Al 2 O 3 and NiO at temperatures from 960°C up to 1105°C. The activation energy and the preexponential factor were in good agreement with literature data. The experimental data of this wor…
Oxygen self-diffusion coefficients in Fe-doped MgO single crystals were determined by an isotope exchange technique. The results indicated dopant-insensitive diffusion, which was interpreted as due to the vacancy pair mechanism.
The alteration of CsAlSi 5 O 12 , a possible host for 137 Cs in tailored nuclear waste ceramics, was studied under simulated nuclear waste repository conditions of 100°, 200°, and 300°C with a confining pressure of 30 MPa. The cesium radiophase was found to be quite stable in water or 3N CaCl 2 , or 3N MgCl 2 but not…
The optical absorption of high lead borate and lead silicate glasses containing manganese before and after γ‐ray irradiation was studied. To separate the absorption due to manganese from the intrinsic absorption, blank glasses were prepared and measured. The results showed that the visible absorption band before and a…
During the pitting of magnesium in chloride solution a film of magnesium chloride forms on the corroding surface. This salt film is apparently a diffusion barrier for water and prevents repassivation by oxide. Properties of magnesium chloride layers were determined on corroding, high purity magnesium shielded electrod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristic ratios of atactic poly(vinylethylene) and poly(ethylethylene)Zhongde Xu, Nikos Hadjichristidis, Jose M. Carella, and Lewis J. FettersCite this: Macromolecules 1983, 16, 6, 925–929Publication Date (Print):June 1, 1983Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal EPR of the oxygen-17-enriched dioxygen adduct of vitamin B12r: reversible oxygen bonding, electronic and geometric structure and molecular dynamicsE. Joerin, A. Schweiger, and H. H. GuenthardCite this: J. Am. Chem. Soc. 1983, 105, 13, 4277–4286Publication Date…
The development of a model for a consistent prediction of metal fire in high pressure oxygen has been attempted. The reaction schemes and reaction rates of metal oxidation are inferred, and the burning region spread rates are predicted. The burning region spread rate V over an infinite thickness piece is shown to depe…
A theory describing bulk better operation is presented. The theory is applicable to a diatomic gas which adsorbs dissociatively on a getter material which exhibits a time independent sticking coefficient. The theory includes the effects of surface reactions and bulk diffusion. Exact numerical solutions are presented f…
An X-ray crystallographic analysis of zinc(II) monoglycerolate has been carried out. The crystals are monoclinic, space group P21/c with a 8.110(1), b 6.404(1), c 8.714(2)Å ß 93.44(1)º. The structure was refined by full-matrix least-squares techniques to an R factor (on 519F) of 0.019. The analysis reveals that the zi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact angle between water and a poly(vinylferrocene) film on a potential-controlled platinum electrodeK. W. Willman and Royce W. MurrayCite this: Anal. Chem. 1983, 55, 7, 1139–1142Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published…
The authors find from NMR (spin-echo) and X-ray diffraction that plastic deformations during cold work introduce many dislocations and associated lattice deformations in a number of Heusler alloys: Pd 2 MnSn, Pd 2 MnSb, Cu 2 MnIn, Cu 2 MnAl, Ni 2 MnIn, Pd 2 MnIn and NiMnSb. In Pd 2 MnSn these effects are very importan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum effects of high-frequency modes in inorganic electron transfer: kinetic isotope effects in redox reactions of hexaaquairon(2+) ion ([Fe(H2O)6]2+, hexa(aqua-d2)iron(2+) ion ([Fe(D2O)6]2+), and hexa(aqua-18O)iron(2+) ion ([Fe(18OH2)6]2+)Tom Guarr, Ephraim Buhks, and Ge…
Broad area electrodes show enhanced electron emission at fairly low dc and rf fields E ~ 107 V/m, thus preventing the attainment of higher electric field strengths E. The enhanced electron emission is initiated by hot electrons, which gained their energy fdxeE in dielectrics ("dust"). Due to their excess energy, hot e…
The structure is composed of the following structural units: (a) tetrahedral sheets S, with composition (Si 6 O 15 ) (super -6) , characterized by five- and eight-membered rings of silicate tetrahedra, with five tetrahedra pointing in one direction and one tetrahedron pointing in the other direction; (b) three-repeat…
We are developing a computer simulation method of predicting the mechanical properties of nonwoven fabrics based on a fundamental microscopic description of the system. The program starts with the known mechanical properties of a given fiber laid out in a web of a particular initial geometry that is held together by s…
A model is developed to estimate the force on a conical-nosed penetrator for normal entry into geological targets that have linear hydrostats and fail according to a Mohr-Coulomb criterion with a tension cutoff. The model is applicable to targets with shear strength which either increases with pressure (dry rocks) or…