Materials Literature
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The classical polarizability theory of optical activity in crystals is elaborated and a method of calculating rotatory power from crystal structure data is described. By varying the polarizabilities of the atoms within reasonable limits, optical rotatory powers are computed for crystals of α-quartz, AlPO4, cinnabar, B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrialkoxynitridomolybdenum compounds: (RO)3Mo.ident.N. Preparation, structures (R = tert-Bu and iso-Pr), and comparisons with a tungsten analog (R = tert-Bu)Dominic M. T. Chan, Malcolm H. Chisholm, Kirsten Folting, John C. Huffman, and Nancy S. MarchantCite this: Inorg. Chem…
An earlier procedure for calculating homogenization during the solidification of binary alloys is extended to include more realistic assumptions for dendrite arm coarsening kinetics and the partition coefficient. Dendrite coarsening is shown to follow the usual exponential function which differs from that relating fin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of structural disorder on organic superconductors: a neutron diffraction body of "high-Tc" .beta.*-(bis(ethylenedithio)tetrathiafulvalene)2 triiodide at 4.5 K and 1.5 kbarArthur J. Schultz, Hau H. Wang, Jack M. Williams, and Alain. FilholCite this: J. Am. Chem. Soc. 1…
The properties of vacancies, self-interstitial atoms and translation stacking faults have been studied by computer simulation using the n-body empirical potentials recently developed for the body-centred-cubic transition metals by Finnis and Sinclair. Vacancy formation energy, formation volume and migration energy hav…
Viscometry, crystal growth kinetics, and glass powder sintering were used to determine the activation energies of viscous flow, crystal growth, and sintering behavior of a standard NBS 710 glass and two crystallizable glass powders in the calciaaluminosilicate system. In a system which sintered successfully to zero po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic and structural studies of configurational isomers of (1,4,8,11-tetraazacyclotetradecane)nickel(2+)E. Kent Barefield, Antonio Bianchi, E. Joseph Billo, Peter J. Connolly, Piero Paoletti, Jack S. Summers, and Donald G. Van DerveerCite this: Inorg. Chem. 1986, 25,…
Abstract The efficiency of several porphyrins at 10 μ M and 83 μ M as sensitizers of the photooxidation of 0.1 m M tryptophan and histidine via a singlet oxygen‐mechanism was studied in pH 7.4‐buffered aqueous solutions and in aqueous dispersions of Triton X‐100 micelles. The porphyrins were either solubilized in the…
A statistical model of microstructural evolution is developed for the evolution of grain structure during deposition. In cases where the atomic mobility on the surface greatly exceeds that in the bulk of the film, the bulk microstructure may be viewed as static while all of the evolution is controlled by the free surf…
Abstract Porphycene and a tetra‐n‐propyl derivative remained unaltered on irradiation in toluene at room temperature. Quantum yields of fluorescence, S T intersystem crossing, and singlet molecular oxygen sensitization, as well as lifetimes of the singlet and triplet excited states were measured. In view of their stru…
First experiments show that cross-linked liquid-crystalline polymers, which are swollen with nematic low molar mass liquid crystals and freely dispersed in this liquid crystal, change their shape if an electic field is applied. This shape variation depends on the degree of swelling.
Abstract The anionic ring‐opening polymerization of 2,2‐dimethyltrimethylene carbonate in solution with sec ‐butyllithium as initiator was found to result under suitable conditions in a bimodal molecular weight distribution, vic. cyclic oligomers and a high‐molecular‐weight polymer. The concentration of cyclic oligome…
Abstract A study about the competition between organic anions (oxalate and malate)—currently present in the rhizosphere and phosphate for adsorption sites in tropical soils—indicate that in the presence of organic anions, phosphate adsorption by soils is reduced. The extent of such reduction is dependent on the way in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic excitation in poly(di-n-hexylsilane)Kenneth A. Klingensmith, John W. Downing, Robert D. Miller, and Josef. MichlCite this: J. Am. Chem. Soc. 1986, 108, 23, 7438–7439Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration mechanism of short-chain branching distribution in linear low-density polyethylenesTakao Usami, Yukitaka Gotoh, and Shigeru TakayamaCite this: Macromolecules 1986, 19, 11, 2722–2726Publication Date (Print):November 1, 1986Publication History Published online1 May…
Abstract A method to study the forced in‐plane flow of an epoxy resin into fibrous networks is presented. A radial in‐plane flow apparatus has been developed which allows strict control of all important experimental variables as well as visual observation of the experiment. From the position and shape of the advancing…
The thermoelectric power of glassy carbon, heat-treated for three hours between 1200 and 2700°C, has been measured at temperatures from 1·5 to 280 K. The dependence of thermoelectric power S on temperature T can empirically be written as S = aT + bT ½ + S B, where the first term is a strong-scattering metallic compone…
Abstract Die kurzzeitige Behanlung ( t ≦ 300 s) von Polyethylen‐ und Polypropylenfolien im nichtthermischen Plasma von O 2 ‐ und NH 3 ‐Hochfrequenz‐Glimmentladungen und die damit verbundene Schaffung von funktionellen Gruppen an der Polymeroberfläche führte zu erheblichen Verbesserungen der Adhäsion von aufgedampften…
Annth power generalization of Longo's roll-off curve equation is proposed. A method for finding the exponentnfrom an experimental curve is given. Eng's model corresponds approximately ton = 5, Good electron guns havenvalues in the 6 to 10 range. The use of n as a figure of merit for quality control is discussed. The c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of argon-ion bombardment on the basal plane surface of molybdenum disulfideJeffrey R. Lince, David J. Carre, and Paul D. FleischauerCite this: Langmuir 1986, 2, 6, 805–808Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published…