Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat capacity and glass transition behavior of amorphous iceY. P. Handa and D. D. KlugCite this: J. Phys. Chem. 1988, 92, 12, 3323–3325Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.…
A theoretical basis for the integration method of predicting the strength of insulation subjected to impulses of nonstandard wave shapes is presented. Two theoretical approaches are developed for a general physical model of impulse breakdown applicable to gaseous, liquid, and solid insulation, and from an energy-balan…
Abstract Phase continuity has been explored as a function of composition for three two‐phase polymer blends produced by mixing in the melt: polystyrene/poly(methyl methacrylate), polystyrene/cis‐polybutadiene, and poly(methyl methacrylate)/ethylene‐propylene rubber. The condition for dual phase continuity Is the appli…
This report describes the electrochemical behavior of polyaniline prepared in aqueous solution with various acid electrolytes. Electroactive polyaniline with two different cyclic voltammograms, i.e. , with and without the additional peak at 500 mV, can be produced by controlling the current densities during the prepar…
A poly-beta-hydroxybutyrate complex extracted from the plasma membranes of genetically competent Escherichia coli contained polyhydroxybutyrate:polyphosphate:calcium in molar ratios approximating 1:1:0.5. The chain length of the polyhydroxybutyrate was estimated as 120-200 subunits, and that of the polyphosphate was e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of naphthalene-bridged porphyrin dimers and their orientation-dependent exciton couplingAtsuhiro. Osuka and Kazuhiro. MaruyamaCite this: J. Am. Chem. Soc. 1988, 110, 13, 4454–4456Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Pub…
Measurement techniques of volume charge distribution within insulating materials are developed using a pulsed electroacoustic method. The fundamental equation of the relation between the charge distribution in the insulating material and the signal voltage from the electroacoustic transducer is presented along with th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFive-fold diamond structure of adamantane-1,3,5,7-tetracarboxylic acidOtto. ErmerCite this: J. Am. Chem. Soc. 1988, 110, 12, 3747–3754Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.1…
Abstract Recent progress, in the quantitative analysis of the distortion of surface electron spectra, resulting from inelastic electron scattering, is reviewed. A physical model for the problem is formulated and based on this, basic deconvolution formulae are found. In the formulae, detailed information on the differe…
Passive glass waveguides made by ion-exchange technique are potential candidates for integrated optics (IO) applications. The authors review the advantages in the technology as applied to fabrication of useful single-mode structures. Progress in process, fabrication, modeling, and waveguide performance using different…
Abstract The Reference Intensity Ratio (RIR) is a general, instrument-independent constant for use in quantitative phase analysis by the X-ray powder diffraction internal standard method. When the reference standard is corundum, RIR is known as I/I c ; These constants are collected in the Powder Diffraction File (1987…
Electron energy-loss spectroscopy measurements have been made on amorphous diamond-like carbon films produced by condensing the plasma stream from a filtered vacuum arc. The results are compared with spectra from diamond, graphitized carbon and amorphous carbon. Although the energy-loss spectra reveal the presence of…
A recent nonlocal damage formulation, in which the spatially averaged quantity was the energy dissipated due to strain-softening, is extended to a more general form in which the strain remains local while any variable that controls strain-softening is nonlocal. In contrast to the original imbricate nonlocal model for…
Excitation spectra of visible luminescence in CsF (2.5-5.6 eV), CsCl (3.9-6.0 eV), CsBr (4.4-6.2 eV), and RbF (2.6-6.2 eV) have been measured at room temperature with use of synchrotron radiation for the energy range up to 40 eV. It is shown that the excitation thresholds of these luminescence bands are located at the…
The electrical conductivity and differential thermal analysis (DTA) characteristics of RECoO 3 (RE=La, Nd, Gd, Ho, Y) have been reexamined. In general, the data are quite different from those previously reported. In particular, first-order semiconductor-to-metal transitions of YCoO 3 , LaCoO 3 and HoCoO 3 are not obse…
There is no fundamental reason that fluids should not be ferroelectric. However, the only knownferroelectric fluids are chiral smectic-$C$ liquid crystals and related structures. We examine the possibility that molecules with permanent dipole moments can form a ferroelectric nematic phase, the least ordered conceivabl…
We have simulated the cooling of Lennard-Jones fluids from liquid temperatures to below the glass transition by using molecular-dynamics calculations and periodic boundary conditions. At higher temperatures the "inherent" structure is independent of temperature, but slightly above the glass transition temperature ${T}…
Introduction It has long been appreciated that advances in solid state science depend critically on the availability of single crystal specimens. As a result, an enormous amount of labor and care has been lavished on the development of growth techniques. In terms of crystal size, purity, and perfection, the achievemen…
We prepared highly crystalline, low-silica X zeolite (LSX) in a self-bound form directly from porous, preformed metakaolin pellets. In the appropriate cation form, these materials should have Improved adsorption properties for weakly Interacting adsorbates such as nitrogen. The composition of the synthesis medium, sub…
Laser emission has been observed in a samarium3+-doped silica optical fibre in a Fabry-Perot-type laser cavity. The emission is centred on 651 nm and corresponds to stimulated transitions from the 4G5/2 level to the 6H9/2 level. The fluorescence and absorption associated with the metastable level are seen to be unusua…