Materials Literature
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An amorphous sediment of charged colloidal particles in a nonaqueous solvent was prepared by centrifugation. The evolution of sediment height and volume fraction profile to equilibrium were studied with light scattering. A simple sedimentation–diffusion equation allows the experimental data to be modeled quantitativel…
Technical Briefs Shrinkage Formation During the Solidification Process in an Open Rectangular Cavity C.-J. Kim, C.-J. Kim Department of Mechanical Engineering, Seoul National University, Seoul 151-742, Korea Search for other works by this author on: This Site PubMed Google Scholar S. T. Ro S. T. Ro Department of Mecha…
The lacE and lacG genes from Streptococcus mutans have been isolated and characterized, and their nucleotide sequence has been determined. The lacE gene encodes the lactose-specific Enzyme II component of the phosphoenolpyruvate-dependent phosphotransferase system (PTS). The lacG gene encodes the phospho-beta-galactos…
Abstract Oxidation of 2,4,6-trichlorophenol (TCP) by layered manganese oxides (Na and Co-buserite) in dilute acidified aqueous suspension gives 2,6-dichloro-p-benzoquinone as a major product. This compound is likely to further polymerize and become incorporated into humuslike materials. The oxidation rate was higher a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmpirical many-body potential energy functions for ironFei Gao, Roy L. Johnston, and John N. MurrellCite this: J. Phys. Chem. 1993, 97, 46, 12073–12082Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWhy hydrogen-bonded liquids tend to have high static dielectric constantsSaul Goldman and Chris JoslinCite this: J. Phys. Chem. 1993, 97, 47, 12349–12355Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993ht…
Eight glass samples in the B 2 O 3 ‐SiO 2 system with compositions from 20 to 90 mol% B 2 O 3 were prepared. The equilibrium vaporization was studied by Knudsen effusion mass spectrometry at temperatures between 1450 and 1500 K. B 2 O 3 ( g ) was the most abundant boron‐containing species in the vapor; no silicon‐cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin films of a binary polymer system: poly(vinyl acetate)/poly(dimethylsiloxane) layers at the air/water interfaceFrank E. Runge and Hyuk YuCite this: Langmuir 1993, 9, 11, 3191–3199Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Publi…
Abstract By means of calorimetric investigations it is shown that dithiol/diene‐mixtures show a more or less distinct spontaneous dark reaction, without light and in the absence of initiators. Pyrogallol, hydroquinone and catechol were tested as stabilizers. The efficacy of the stabilizer to transform the radicals res…
The in vivo antiviral activity of the Keggin polyoxotungstate PM-19 [K7(PTi2W10O40).6H2O] against herpes simplex virus type 2 (HSV-2) was investigated in mice immunosuppressed by cyclophosphamide (CY). When PM-19 was administered intraperitoneally to immunosuppressed mice for 3 days (once daily) starting at the time o…
In this article, the important properties and applications of shape memory polyurethanes are introduced. A number of dramatic property changes occurring at the glass transition temperature are reviewed, including elastic modulus, hardness, damping, variable vapor permeability, shape memory, and fixity. Stress-strain-t…
A systematic study of the particle size dependence of the ferroelectric domain, internal stress and dielectric constant ( K ) of BaTiO 3 powders was performed using scanning electron microscopy, X-ray diffractometer and differential scanning calorimetry. The dielectric constant of BaTiO 3 powder was lower than that of…
Paraelastic–ferroelastic phase boundaries (interfaces) are two-dimensional formations in the three-dimensional crystal lattice, which accommodate the crystal lattices of two neighbouring modifications of the same compound. Their characteristic features include both orientation and kinetic properties. Three theories ar…
Information available from recent literature (1—6) is presented in this report on PVC-based, ABS-based, and PC-based polyblends. Property profiles of polyblends are superior to those of component homopolymers. Enhanced properties, combined with the low cost of polyblends, make them economically attractive for special…
Nd/sub 2/Fe/sub 14/BH/sub x/ micron-size loose particles are synthesized by the oxide reduction-diffusion technique. When excess Ca is used as a reducing agent, an exothermic reaction is observed by washing under water, with production of native hydrogen that diffuses in the interstitial sites of the alloy. Depending…
Numerous complex interacting factors complicate the prediction of the existence, structure, and properties of solid‐state compounds. No success crowned the efforts to synthesize a compound of composition C 3 N 4 having a β‐Si 3 N 4 structure, which should have the hardness and stability of diamond. Recently Lieber et…
An electric generator based on the magnetostrictive effect is presented. Longitudinal oscillations of a Terfenol-D rod give rise to a varying flux which induces a current in a coil wound around the rod. A small prototype of such a device is discussed, and both calculations and experiments are performed. The problem of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRuthenium(II) complexes of a fused phenanthroline-pteridinedione ligandKirk J. Black, Huakai Huang, Stacie High, Lee Starks, Mark Olson, and Mark E. McGuireCite this: Inorg. Chem. 1993, 32, 24, 5591–5596Publication Date (Print):November 1, 1993Publication History Published o…
The solid-state transition mechanisms of ammonium nitrate IV, III, and II were studied by measuring samples simultaneously by Raman spectrometry and differential scanning calorimetry (DSC). The Raman instruments were a Fourier transform Raman spectrophotometer and triple monochromator Raman spectrophotometer with char…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(styrene-co-N-maleimide) copolymers: preparation by reactive extrusion, molecular characterization by FTIR, and use in blendsI. M. Vermeesch, G. Groeninckx, and M. M. ColemanCite this: Macromolecules 1993, 26, 24, 6643–6649Publication Date (Print):November 1, 1993Publica…