Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain-length dependence of electrochemical and electronic properties of neutral and oxidized soluble .alpha.,.alpha.-coupled thiophene oligomersJ. Guay, P. Kasai, A. Diaz, Ruilian Wu, James M. Tour, and Le H. DaoCite this: Chem. Mater. 1992, 4, 5, 1097–1105Publication Date (…
The liquid-glass transition dynamics of the molecular glass Salol has been studied by light-scattering spectroscopy from 383 to 198 K. Analysis of wide-frequency-range composite spectra revealed the relaxation dynamics from 0.2 GHz to 3.5 THz. A two-step relaxation process was observed near the crossover temperature $…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIs the molecular surface of polystyrene really glassy?Gregory F. Meyers, Benjamin M. DeKoven, and Jerry T. SeitzCite this: Langmuir 1992, 8, 9, 2330–2335Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOligothiophene cation radicals. .pi.-Dimers as alternatives to bipolarons in oxidized polythiophenesMichael G. Hill, Jean Francois Penneau, Baruch Zinger, Kent R. Mann, and Larry L. MillerCite this: Chem. Mater. 1992, 4, 5, 1106–1113Publication Date (Print):September 1, 1992…
Low-temperature electrical resistivity, specific heat, and magnetic measurements have been performed on the distorted perovskite ${\mathrm{LaNiO}}_{3}$. The electrical resistivity shows a linear temperature dependence at high temperatures and an ${\mathit{AT}}^{2}$ dependence below \ensuremath{\sim}50 K. The static pa…
Anaerobic uptake mechanisms of acetate, propionate and lactate by the sludge developed in an anaerobic aerobic biological phosphate removal process was investigated. Anaerobic batch experiments were conducted with these substrates, and mass balances of materials involved in substrate uptake metabolism were calculated.…
The selection rules for far-infrared and Raman transitions of a solid sphere are derived from group theory. By far-infrared only the spheroidal dipolar modes are excited, by Raman scattering the spherical and spheroidal quadrupolar modes are observed.
Infrared spectra of sodium and potassium alkaline-metal nitrates and magnesium and calcium alkali-earth nitrates in solid phase had been recorded in order to assign the fundamental bands. The influence of the dispersal médium (alkaline halide), employed in the solid sample preparation have been discussed. The quantita…
This text fits into the context of the attempt to emphasize the considerable importance of the factor of the construction materials in the subsection of low cost housing in Developing Countries in general and in Latín America in particular. The author tries to quantify, in a global manner, the repercussion of the mate…
Bases under the law of solubility product, the pores of the cement mortar are refilled by impregnation with two salts that form another insoluble salt. The number of treatments to be underdone and the drying temperatures more suitable in each case. The calcium salts like impregnants and urea sodium oxalate and sugar l…
Non-destructive measurement techniques are revealing themselves as a very important tool in the different fields or research due to their very own nature. The Materials team of ICCET is developing, since some time ago, the application of one of these techniques —specifically speaking, infrarred thermography— to the fo…
Red and orange calcium sulfide phosphors (CaS:Eu and CaS:Mn) were prepared by the flux method. Eu 2+ and Mn 2+ show strong concentration quenching at 0.1 and 0.8% respectively. Use of the potassium polysulfide flux leads to efficient phosphors; their efficiency reaches 60 and 100% of Y 2 O 2 S:Eu, respectively. Calciu…
The refractive index for a family of optical glasses (tellurite containing halide) has been analyzed. From the dielectric theory, the relationship between the refractive index and number of ions/unit volume (N/V) with polarizability α has been discussed. Halogen substitution resulted in a lower dielectric constant, al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation mechanisms and plastic resistance in single-crystal-textured high-density polyethyleneZ. Bartczak, A. S. Argon, and R. E. CohenCite this: Macromolecules 1992, 25, 19, 5036–5053Publication Date (Print):September 1, 1992Publication History Published online1 May 200…
Abstract A need exists for the development of totally biodegradable packaging materials. Chitosan is an under‐utilized polymer which possesses many of the desired characteristics for this application. This article describes the crosslinking of chitosan fibers. Epichlorohydrin (ECH) was selected as a convenient base ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent effects on the photochromic reactions of diarylethene derivativesMasahiro Irie and Koichi SayoCite this: J. Phys. Chem. 1992, 96, 19, 7671–7674Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties of composite membranes containing arrays of nanoscopic gold cylindersColby A. Foss Jr., Gabor L. Hornyak, Jon A. Stockert, and Charles R. MartinCite this: J. Phys. Chem. 1992, 96, 19, 7497–7499Publication Date (Print):September 1, 1992Publication History P…