Materials Literature
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This paper attempts to examine the utility potential of polymeric electro-optic devices for applications in optical telecommunication, switching and signal processing. A preliminary study reveals that there exists a great deal of potential in the polymeric devices for applications that require high bandwidth, low loss…
A study of the flashover mechanism initiated by metallic particles in SF/sub 6/ gas is presented. Using a high-speed Imacon photographic camera, it was established that a metallic particle near the insulator surface plays an important role in flashover development. The influence of the particle on flashover developmen…
Landau theory provides a group-theoretical method for determining which symmetry changes can occur in second-order phase transitions in solids. The irreducible representations of the space group of the higher-symmetry phase must satisfy certain conditions. For transitions to commensurate crystalline structures, the La…
Abstract Steady shear viscosity and ionic conductivity have been measured for nine commercial diglycidyl ether of bisphenol‐A (DGEBA) epoxy resins with molecular weights ranging from 340 to 14,200. The temperature dependence of viscosity and ionic conductivity was modeled using free volume viscosity and ionic conducti…
The pad‐dry‐steam and pad‐dry‐bake finishing of tussah silk fabric with triglycidyl ether of glycerol in the presence of catalysts has been investigated. Potassium thiocyanate was found to be the most effective accelerating agent for this purpose. The optimum treatment conditions for either steaming or baking are disc…
Abstract Using various cellulose samples, the conditions of cellulose dissolution in N,N‐dimethylformamide with added lithium chloride were established. The way of activation of cellulose influences decisively the dissolution. Complete dissolution of microcrystalline cellulose can only be achieved after treating with…
[Mn3(CO)9(μ3-S)2] - has been isolated from the reaction between [Mn(CO)5]- and 5-substituted 1,3,4-oxathiazol-2-one (RCNSCO(O); R = phenyl, methyl, 3,5-dinitrophenyl) in THF. X-ray analysis revealed a D3h equilateral triangular cluster with three Mn(CO)3 units (Mn-Mn = 2.7680(16)-2.7918(13) Å) apically bicapped by two…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of a 2,7-dimethoxy-N-methylcarbazole-based polysiloxaneT. Ganguly, L. Farmer, W. Li, J. Y. Bergeron, D. Gravel, and G. DurocherCite this: Macromolecules 1993, 26, 9, 2315–2322Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Pub…
A series of new brownmillerite solid electrolytes of composition have been synthesized and incorporated into small laboratory fuel cells. Ionic conductivities for both the phases were measured and conductivities up to at 600°C were observed. An activation energy for ionic conduction of 0.35 eV was measured for the pha…
The results of molecular-dynamics simulations of the phase separation of binary fluids in narrow channels are presented. Two channel widths allowing for one or two fluids layers are considered. The one-layer case does not exhibit good scaling. The two-layer case does and the growth exponents are the same as that found…
Abstract Raman microprobe and diffuse‐reflectance Fourier transform IR spectra of a series of seven metal hexaborides show that the basic cubic symmetry of these systems is lowered owing to lattice vacancies. The resulting wave vector is oriented along the C 4 axis of the first Brillouin zone. Studies of enriched boro…
Abstract The accuracy of quantitative XPS analyses using relative sensitivity factors is increased if matrix effects are accounted for in calculations of surface composition. This requires knowledge of the energy dependence of the inelastic mean free path (IMFP) for a given sample. It is sufficient for routine analyse…
density. Such a temperature effect would only be noticeable for elements with closely spaced partially occupied energy levels, like the 3d metals, but not for first-to third-row elements. This is consistent with the observation that the water densities are virtually identical at the two temperatures. If the above inte…
Developments in polymeric materials in 1992 were characterized by small but important steps achieved as the result of much detailed work. Increasing attention is being paid to the supramolecular structure of the materials with the aim of producing ever smaller well‐defined systems. Examples cited in the review include…
By a newly developed double-stranded mutagenesis technique, histidine (H), glutamate (E), arginine (R) and leucine (L) have been substituted for the lysyl 193 residue (K-193) in isocitrate lyase from Escherichia coli. The substitutions for this residue, which is present in a highly conserved, cationic region, signific…
A complex calorimeter has been developed. This calorimeter, which can be operated both in the ac mode and the relaxation mode using the same sample cell and the same apparatus settings, uses only a small amount (30-50 mg) of sample. An application to measurements in the vicinity of the antiferroelectric phase transiti…
Abstract Gd 2 (SO 4 ) 3 · 8 H 2 O kristallisiert monoklin in der Raumgruppe C2/c mit den Gitterkonstanten a = 13,531(7), b = 6,739(2), c = 18,294(7) Å und β = 102,20(8)°. In der Struktur ist Gd von je 4 Sauerstoffatomen des Hydratwassers und der Sulfationen in Form eines stark verzerrten quadratischen Antiprismas umge…
Time‐dependent deformation behavior was investigated for soda–lime silicate glass with various water contents, using a nanoindentation technique. The complete indentation curve, loading and unloading part, is analyzed. It is shown that this deformation behavior may be represented in terms of a simple mechanical model…
Two GaAs/GaInP superlattices grown on GaAs substrates by low-pressure metalorganic chemical vapor deposition have been studied using high resolution x-ray diffraction measurements and simulations by solving Tagaki–Taupin equations. The strained layers at both interfaces of the GaAs well are identified from the simulat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the interdiffusion between poly(methyl methacrylate) films by marker movementY. Liu, G. Reiter, K. Kunz, and M. StammCite this: Macromolecules 1993, 26, 8, 2134–2136Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published…