Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPacking Analysis of Carbohydrates and Polysaccharides. 6. Molecular and Crystal Structure of Regenerated Cellulose IIArthur J. Stipanovic and Anatole SarkoCite this: Macromolecules 1976, 9, 5, 851–857Publication Date (Print):September 1, 1976Publication History Published onl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic effects in transition metal porphyrins. The reactions of imidazoles and pyridines with a series of para-substituted tetraphenylporphyrin complexes of chloroiron(III)F. Ann Walker, Man-Wai Lo, and Molly T. ReeCite this: J. Am. Chem. Soc. 1976, 98, 18, 5552–5560Publ…
This study confirms the predominance of surface thermodynamic effects in the process of particle engulfment by solidifying melts for small-diameter particles and slow interface motion. Predictions of a thermodynamic model are compared with actual particle engulfment behavior. It turns out that, in complete quantitativ…
Abstract A nonlinear inhomogeneous relaxation equation for the alignment tensor is derived from a Fokker-Planck-equation for the orientational distribution function where torques exerted by a molecular field and by the gradient of the flow velocity are taken into account. Phenomenological coefficients characterizing t…
Abstract The crystallinity and crystallizability of poly(phenylene sulfide) have been examined by a number of common techniques. Several provided qualitative information, but only one, x‐ray diffraction, was considered sufficiently reliable and reproducible to allow quantitative comparisons. Based on x‐ray measurement…
In a creeping solid holes may grow by vacancy condensation or by the action of the applied stress producing strains at the surface of the hole which cause it to grow. The latter mechanism does not involve a vacancy flux to the hole. A comparison of the two processes indicates the conditions under which hole growth wit…
A Landau-Ginzburg free energy is presented that yields a nematic to smectic-$A$ (NA) transition, a nematic to smectic-$C$ (NC) transition, and a Lifshitz point (at the boundary between the NA and NC transitions). Fluctuation enhancements of the Frank elastic constants are calculated. For the NC transition, all three e…
Phases can be determined for geometrically redundant amplitudes by iteration of the following procedure: compute an electron density map from the currently available phases; average the electron densities of all the crystallographically independent molecules; rebuild the crystal(s) from this averaged subunit, setting…
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Abstract Electronic spectra of several TCNQ, complexes have been measured with single crystals by the transmission method. The assignment of electronic transitions are presented based on the electronic structure of the crystals. The molecular viewpoint is stressed in a theoretical treatment. The spectra are interprete…
Continuum plasticity is used to derive a new model for the plastic zone of secondary dislocations (B structure) observed around undeformable particles in a plastically deformed metal matrix. The model is compatible with observations of these dislocations by electron microscopy. The contribution of these dislocations t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of nickel-tungsten-alumina catalysts by x-ray photoelectron spectroscopyKung T. Ng and David M. HerculesCite this: J. Phys. Chem. 1976, 80, 19, 2094–2102Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 Septem…
Abstract: The energies of planar vs. tetrahedral geometries of tetracoordinate organic molecules have been surveyed by ab initio molecular orbital calculations. Because of their 7 ~ acceptor and u donor character, electropositive substituents, especially lithium, are particularly effective in stabilizing the planar ar…