Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-nitroxyl interactions. 20. Electron paramagnetic resonance spectra of spin-labeled vanadyl and silver porphyrinsKundalika M. More, Sandra S. Eaton, and Gareth R. EatonCite this: J. Am. Chem. Soc. 1981, 103, 5, 1087–1090Publication Date (Print):March 1, 1981Publication…
Abstract The system of calcium oxide and water vapor was studied using the transpiration method. Under the conditions of a temperature range from 1678 to 2016 K and PH2O values from 1.2×10−2 to 4.7×10−1 atm, the predominant reaction in this system was found to be CaO(s)+H2O(g)=Ca(OH)2(g). The standard Gibbs free energ…
A low oxygen processing technique was developed for the manufacture of SmCo5 and temperature compensated magnets. Improvement in the magnetic field orientation monitored by Schulz pole figure technique and the controlled oxygen processing resulted in SmCo5 magnets with energy products of 25–28 MGOe. The temperature de…
The effect of beef carcass electrical stimulation on the thermal stability of intramuscular collagen was determined. Differential scanning calorimetric determinations of thermal shrinkage temperature revealed that electrical stimulation lowered the shrinkage temperature of collagen by an average of .6 C in the populat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure determinations of halotetrakis(tert-butyl isocyanide)((N,N'-di-tert-butyldiamino)acetylene)molybdenum(II) complexesPeter W. R. Corfield, Laima M. Baltusis, and Stephen J. LippardCite this: Inorg. Chem. 1981, 20, 3, 922–929Publication Date (Print):March 1, 1981Publi…
The response of a spherical bubble in an inviscid compressible liquid is studied for five different bubble models. It is shown that the qualitative behavior of the models is essentially the same, even under intense cavitation conditions. The quantitative behavior is similar, especially for low Mach numbers.
Abstract AgCo 3 H 2 (AsO 4 ) 3 ( 1 ) und AgZn 3 H 2 (AsO 4 ) 3 ( 2 ) wurden durch Erhitzen eines Gemisches von As 2 O 5 , AgNO 3 , CoSO 4 · 7H 2 O bzw. ZnSO 4 · 7H 2 O und Wasser auf 300°C im Autoklaven dargestellt und röntgenographisch untersucht. Beide Verbindungen sind isotyp und kristallisieren in der monoklinen R…
The title compound NEP-TCNQ crystallizes with θ-bonded (TCNQ−-TCNQ−)-dimers. We show by model calculations and ESR spectroscopy, that these bonds can be broken by thermal activation. The reverse reaction occurs spontaneously. The excited states are characterized as quasi immobilized triplet spin excitons (TSE) localiz…
Abstract The X-ray photoelectron spectrum of the powder of Cr2O5 was measured and compared with those of the related chromium compounds. It is concluded that Cr2O5 is a mixed-valence compound having Cr3+ and Cr6+ ions, possibly with the ratio of 1 : 2.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 magnetic resonance and temperature-jump spectrophotometric study of the square planar-octahedral equilibrium in the 1,4,7,10-tetraazacyclododecanenickel(II) systemJohn H. Coates, Dewan A. Hadi, Stephen F. Lincoln, Harold W. Dodgen, and John P. HuntCite this: Inorg.…
In this paper the pseudo-spin-lattice-coupled-mode (PLCM) model has been extended to study the static and the dynamic properties of PbHP${\mathrm{O}}_{4}$ and its deuterated form PbDP${\mathrm{O}}_{4}$. Using a double-time temperature-dependent Green's-function technique, we have derived the expressions for the transi…
Optical, X-ray, and electron metallography have been used to examine the substructures and textures developed in 90–10 brass after rolling reductions from 18 to 96%. The substructures formed in this alloy, which has an intermediate value of stacking fault energy, have been found to be orientation dependent. In some re…
We present a theory for the late-stage spinodal decomposition for two relaxational tricritical models in which the order parameter is nonconserved and the subsidiary order parameter is either conserved or nonconserved. We find that for $d$-dimensional systems (for $d>1$) the characteristic domain size grows in prop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical anions of triptycene bis- and tris(quinones)Glen A. Russell, N. K. Suleman, Hiizu Iwamura, and Owen W. WebsterCite this: J. Am. Chem. Soc. 1981, 103, 6, 1560–1561Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 M…
The structural characteristics of four random network models of B2O3 glass are discussed, and their computed X-ray radial distribution functions are compared with experiment. A random network based on the boroxol ring hypothesis gives marginally the best agreement with the observed distribution function at low interat…
Partial ionic and electronic dc conductivities and compressional creep rate were measured for hot‐pressed poly crystalline AI 2 O 3 made from AI‐isopropoxide (AI 2 O 3 (II)). The undoped material was found to contain 1.5×10 18 cm −3 fixed valency acceptors (Mg). Properties of undoped material and material doped with F…
Abstract Uni‐ and biaxial stretching of poly(ethylene terephthalate) (PET) specimens of appropriate geometry at temperatures near the glass‐rubber transition may lead to non‐uniform deformation unless the draw ratio exceeds a critical value, the natural draw ratio, characteristic of the onset of strain hardening due t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoatropisomerization of "picket-fence" porphyrins and their metal complexesRuth A. Freitag, Janet A. Mercer-Smith, and David G. WhittenCite this: J. Am. Chem. Soc. 1981, 103, 5, 1226–1228Publication Date (Print):March 1, 1981Publication History Published online1 May 2002P…
Abstract The synergism in limiting oxygen index found in BPA carbonate–dimethylsiloxane block polymers (BPAC/DMS) is correlated with a rise in yield of pyrolytic char and an improvement in char oxidation resistance. These changes in turn are related to a peaking of fractional silicon retention in the char at a resin c…
Abstract— The formation of the cation radical of methyl viologen was established when an aqueous solution containing zinc‐meso‐tetraphenylporphyrintrisulfonic acid, methyl viologen and mercaptoethanol was irradiated by visible light. The reduction of methyl viologen has been studied kinetically and the reduction rate…