Materials Literature
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Two techniques are presented for the extraction of the individual intensities of completely overlapping reflections in a powder diffraction pattern. The first is analogous to Sayre's [ Acta Cryst. (1952). 5 , 60–65] squaring method while the second is based upon maximizing the entropy of the Patterson function subject…
La phase incommensurable de [N(CH 3 ) 4 ] 2 [ZnCl 4 ] cristallise dans le groupe de superespace Pmcn. Affinement de la structure jusqu'a 0,052. La phase «lock-in» cristallise dans le groupe d'espace P2 1 cn. Affinement jusqu'a 0,075
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibria and UV spectra of mono- and polynuclear molybdenum(VI) speciesJ. J. Cruywagen and J. B. B. HeynsCite this: Inorg. Chem. 1987, 26, 16, 2569–2572Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https…
A kinetic study of the aging behavior of tetragonal zirconia polycrystals (TZPs) from 100° to 500°C suggests that there exists a cricital grain size of 0.52 μm below which the tetragonal symmetry can be retained. Property degradation of TZPs at low temperatures is connected with transformation‐induced microcracking. I…
Increasing the cooling rate from the melt has been found to increase the rate of slow crack growth at 42°C. For various histories of cooling rate, annealing and specimen geometries, the initiation rate increased when the density decreased. The effect of residual stresses on slow crack growth was separated from the eff…
Rapidly quenched Nd-Fe-B magnets show a pronounced composition dependence of the intrinsic coercivity HcI which increases with increasing Nd content to values of 23.5 kOe. The magnetic hardening is ascribed to a Nd-rich phase located at the phase boundaries of the Nd2Fe14B grains. Samples prepared by crystallization o…
Optimal anticancer treatment with cell cycle-specific antimetabolites requires maintenance of a cytotoxic drug level for a prolonged period of time. We explored the use of multivesicular liposomes as a slow-release depot of 1-beta-D-arabinofuranosylcytosine for intrathecal administration. The intrathecal half-life of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of annealing effects on the structure of vinylidene fluoride-trifluoroethylene copolymers using WAXS and SAXSMaria Victoria Fernandez, Atsuhiko Suzuki, and Akio ChibaCite this: Macromolecules 1987, 20, 8, 1806–1811Publication Date (Print):August 1, 1987Publication Hist…
New nematic liquid crystalline phenylcyclohexanes with (i) a terminal side-chain vinylic group some distance from the rigid core and (ii) both polar and non-polar terminal side-chain groups, were synthesized. Investigations of their elastic, birefringence, dielectric and rotational viscous properties have shown severa…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
It is shown that the Curie point of the ferroelectric vinylidene fluoride-trifluoroethylene copolymer can be shifted to the low temperatures by electron radiation. This effect was studied by in situ dielectric measurements as a function of the dose and of the irradiation temperature. An additional effect of the irradi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMembrane-spanning steroidal metalloporphyrins as site-selective catalysts in synthetic vesiclesJohn T. Groves and Ronny NeumannCite this: J. Am. Chem. Soc. 1987, 109, 16, 5045–5047Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published…
Abstract A preliminary report is given on the gas transport characteristics of a thermotropic liquid‐crys talline copolyester that is fully aromatic. At 35°C the permeability coefficients for He, H 2 , O 2 , Ar, N 2 , and CO 2 in this polymer are comparable to or smaller than those for polyacrylonitrile, which is one…
Abstract Cobalt(II) hydroxide–(sodium fluoride tetrasilicic mica) intercalation complexes were prepared by titrating cobalt(II) nitrate solutions in the presence of mica with sodium hydroxide under oxygen-free conditions. These complexes were characterized by chemical analysis, XRD, DTA-TGA, IR, and surface area measu…
Continuum diffusion of a third species in a two-phase system comprised of stationary globules, randomly distributed in a uniform background medium, is considered. The diffusing species can dissolve in either phase, with different solubilities and diffusion constants. A density expansion of the average diffusion coeffi…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational studies of interstitial carbide atoms in nickel and rhenium carbonyl carbide clustersP. L. Stanghellini, R. Rossetti, G. D'Alfonso, and G. LongoniCite this: Inorg. Chem. 1987, 26, 17, 2769–2774Publication Date (Print):August 1, 1987Publication History Published o…
A method is described of synthesizing a real-space distribution of scattering points which will give rise to virtually any required diffraction pattern. The distribution may be used in the form of an optical diffraction screen to give an immediate visual check on both the real-space and reciprocal-space distributions.…
The occurrence of discharges in an insulation system consisting of lapped uniaxially oriented polyethylene tapes impregnated with dodecylbenzene oil and the behavior of air bubbles injected into the structure have been investigated. This insulation system should be suitable for use in power transmission cables because…