Materials Literature
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The Sm-N transition temperatures of the C1-C12 homologs of some p-phenylene di-p-n-alkoxybenzoates were studied. For three homologous series of these esters (unsubstituted, methyl-substituted, and chlorosubstituted on the central phenylene ring), the transition temperature was found to decrease at first on ascending t…
Abstract The distribution of polyenes which results from the chemical dehydrochlorination of poly(vinyl chloride) has been studied in dichloromethane (DCM) and tetrahydrofuran (THF) solvents. A higher percentage of longer polyenes is formed in DCM than in THF. On the addition of trifluoroacetic acid to DCM solutions o…
Abstract The process of in vitro fibrillogenesis of type I collagen from bovine tendon has been studied with particular attention to the events occurring in the lag phase. From the conditions under which those events can be reversed or stabilized and from the effects of reduction on the length of the lag phase, we con…
A review is presented of the state of the art in the analysis of materials and structures subjected to intense impulsive loading. Emphasis is placed on the penetration and perforation of solids and current developments in three-dimensional finite element and finite difference simulation of impact phenomena. The need f…
The single-crystal ESR spectra of the base adducts of cobalt(1I) acetylacetonate with 6-methylquinoline, pyridine, and water have been recorded. The g values are in each case anisotropic, the g, splitting increasing on passing from 6- methylquinoline to pyridine and water. For the last case also the cobalt hyperfine s…
Abstract The phase relations of the ternary system Ag-As-S were established by DTA and X-ray investigations. The quasibinary sections Ag 2 S-Ag 7 AsS 6 and Ag 7 AsS 6 -Ag 3 AsS 3 are described. The system Ag-As-S contains several stable compounds, including Ag 7 AsS 6 as a member of the Argyrodit family. The compounds…
Abstract Neutron powder diffraction studies on stoichiometric and non‐stoichiometric pyrochlore phases of the ZrO 2 ‐ Nd 2 O 3 system show remarkable differences in the occupation factor of the 8b site of space group Fd3m to which the pyrochlore phase belongs. Stoichiometric Nd 2 Zr 2 O 7 can be described as a perfect…
Abstract Three grades of poly(1,4‐butylene terephthalate) (PBT) were aged up to three years at 100, 75, 50, and 11% relative humidity and temperatures of 66–93°C. The decrease in mechanical properties, caused by hydrolysis, occurs rapidly at the higher temperatures and relative humidities and progressively slows as th…
Ge–P–S glass fibers have been drawn from glass rods prepared in sealed silica glass ampoules under a vacuum. The optical loss for the glass fiber has been as low as 0.4 dB/m at about 2.5 µm wavelength. The strong absorption peaks observed at 3 and 4 µm wavelengths originate from OH and SH impurities, respectively. The…
We have measured high-resolution x-ray absorption spectra of lanthanide (Ln) and heavy transition metal complexes that display prominent narrow absorption peaks near the L2 and L3 absorption edges. The anomalous scattering factors (f' and f"), which are mathematically related to the absorption cross section, have corr…
A theory is developed to predict the free energy and microdomain size of block copolymer systems, taking into account solvent-polymer interactions. The mean-field equations for the polymer probability densities are derived from fundamental statistical mechanics, starting from the total interaction energy of the system…
The molecular structures of the group IB trimers, Cu(3), Ag(3), and Au(3), have been determined by using the semi-empirical diatomics-in-molecules theory. The trimers are found to have C(2v) symmetry with bond angles between 65 degrees and 80 degrees . The trimers are bound with respect to dissociation to the asymptot…
The paper suggests the analysis of the x-ray diffraction trace of viscose rayon by the correlation- crystallinity index method for routine assessment of crystalline order in samples composed of cellulose II, and by the multipeak-resolution method for special analysis of crystallinity and crystallite size in samples co…
Metal and metal oxide precipitates exhibiting different morphologies were prepared by hydrothermal aging of strongly alkaline solutions of chelated nickel (II) or cobalt (II) salts at 250 C. Triethanolamine (TEA) (ethylenedinitrilo)tetraacetic acid (EDTA), and N-(2-hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA) w…
Abstract Hexaphenyldigerman‐Dibenzol kristallisiert rhomboedrisch in der Raumgruppe R3 mit a = 1153,8(1) pm, c = 2581,8 (4) pm, Z = 3. In der Kristallstruktur ist jede Ge 2 Ph 6 ‐Molekel von 8 Kristallbenzolmolekeln umgeben, von denen 2 die GeGe‐Einheit sandwich‐artig side‐on umfassen und jeweils 3 end‐on auf ein Ger…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition-metal complexes of pyrrole pigments. 16. Cobalt complexes of 1,19-dimethyldehydrocorrins as vitamin B12 modelsYukito Murakami, Yasuhiro Aoyama, and Koji TokunagaCite this: J. Am. Chem. Soc. 1980, 102, 22, 6736–6744Publication Date (Print):October 15, 1980Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntersystem-crossing dynamics and coordination geometry changes observed by ultrasonic and laser temperature-jump relaxation of the 2T .dblharw. 6A spin equilibrium of hexadentate iron(III) complexes in solutionRobert A. Binstead, James K. Beattie, T. G. Dewey, and Douglas H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective Transport of Sulfur Dioxide through Polymer Membranes. 1. Polyacrylate and Cellulose Triacetate Single-Layer MembranesDonald L Kuehne and Sheldon K. FriedlanderCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 4, 609–616Publication Date (Print):October 1, 1980…
The phases of ammonium nitrate, NH4NO3, doped with small amounts of NiO or CuO have been studied by X-ray and neutron diffraction at various temperatures from 80 to 423 K. NH4NO3 with metal-oxide additives, which are believed to form complexes, exists as a solid solution. Phase IV is stable down to 140 K in the NiO-do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of Batch CrystallizersNarayan S. Tavare, John Garside, and Madhav R. ChivateCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 4, 653–665Publication Date (Print):October 1, 1980Publication History Published online1 May 2002Published inissue 1 October 1980https:/…