Materials Literature
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The local structure of ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy semiconductors has been studied using x-ray anomalous scattering and x-ray-absorption spectroscopy as a function of the composition. Two important findings are (a) tellurium (Te) atoms are twofold coordinat…
A hysteresis is observed in the triple helix-coil transition of type III collagen. This hysteresis appears in the thermal transition, where it is not solvent-dependent, and also in the transition induced by guanidinium hydrochloride. The transitions are observed both by optical rotatory dispersion and by trypsin diges…
The purpose of the method described in this paper is to identify with precision sharp phenomena and to produce reliable solutions for various kinds of one-dimensional grating problems in the resonance domain, without limitation in the geometry or the electromagnetic parameters. The theory lies in the use of finite ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of diaqua(L-aspartato)copper(II)R. Calvo, C. A. Steren, O. E. Piro, T. Rojo, F. J. Zuniga, and E. E. CastellanoCite this: Inorg. Chem. 1993, 32, 26, 6016–6022Publication Date (Print):December 1, 1993Publication History Published onli…
Hydration reactions of C 3 A and C 4 AF with calcium sulfate hemihydrate and gypsum were investigated and the kinetics of the reactions compared. The rates of C 3 A and C 4 AF hydration, as determined by heat evolution, vary depending on whether the sulfate‐containing reactant is gypsum or calcium sulfate hemihydrate.…
Cobalt phthalocyanine was synthesized within the cavities of Y zeolites and was characterized in all the steps of the synthesis and purification procedures by elemental analysis, Fourier transform infrared spectroscopy, UV-visible spectroscopy, X-ray photoelectron spectroscopy, surface analysis, thermogravimetric anal…
The AC electromigration lifetime, without DC component, has been studied in a wide frequency range (mHz to 200 MHz) and found to be linearly proportional to the repetition frequency of the AC stressing current. This behavior is observed in both of the metallization systems (Al-2% Si and Cu) investigated. This provides…
We compared the use of nitrous oxide (N 2 O) and hydrogen peroxide (H 2 O 2 ) as the oxidant in digital chemical vapor deposition to obtain high-quality optical crystalline thin films of Al 2 O 3 . Optical constants and thicknesses of these films were investigated in terms of growth temperature, by using variable-angl…
The recent discovery, by high-resolution x-ray-diffraction measurements, of two length scales in ${\mathrm{SrTiO}}_{3}$ motivated a reinvestigation by neutron scattering of the soft phonon and associated central peak above the zone-boundary structural-phase-transition temperature (${\mathit{T}}_{\mathit{c}}$=99.5 K).…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh temperature stabilization of crosslinked siloxanes glassesM. J. Michalczyk, W. E. Farneth, and A. J. VegaCite this: Chem. Mater. 1993, 5, 12, 1687–1689Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 199…
Crystallization phenomena and processes may be greatly affected by the addition of surfactants, which play an important rote in nucleation and growth kinetics and can substantially modify both habit and size distribution of crystal products. Moreover, scaling in industrial equipments and caking in storage tanks can be…
The pressure dependence of the vibrational modes of forsterite (Mg2SiO4) crystal and glass were measured to 50 GPa at 298 K with Raman spectroscopy. Raman bands of crystalline forsterite persist to 50 GPa. Two new Raman bands appear above 30 GPa. On decompression the new bands are retained to 8 GPa. The spectral chang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective ethylation and vinylation of alkanes via polyoxotungstate photocatalyzed radical addition reactionsB. Scott Jaynes and Craig L. HillCite this: J. Am. Chem. Soc. 1993, 115, 25, 12212–12213Publication Date (Print):December 1, 1993Publication History Published online1…
Abstract Crystalline poly(arylene ether nitrile) could be prepared by the polycondensation of 2,6‐dihalobenzonitrile with resorcinol at 200°C in N‐methylpyrrolidone in the presence of sodium carbonate. A reaction temperature of at least 200°C was necessary to attain high molecular weight polymer. Spectral data indicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration of glass structures for molecular simulations of polymers containing large monomer units: application to polystyreneRajesh Khare, Michael E. Paulaitis, and Steven R. LustigCite this: Macromolecules 1993, 26, 26, 7203–7209Publication Date (Print):December 1, 1993Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroviscoelastic effect of polymer blends consisting of silicone elastomer and semiconducting polymer particlesTohru Shiga, Akane Okada, and Toshio KurauchiCite this: Macromolecules 1993, 26, 25, 6958–6963Publication Date (Print):December 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTopographically directed nucleation of organic crystals on molecular single-crystal substratesPhillip W. Carter and Michael D. WardCite this: J. Am. Chem. Soc. 1993, 115, 24, 11521–11535Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in poly(4-vinylpyridine)/poly(vinyl acetate-co-vinyl alcohol) blends. An infrared studyLuis C. Cesteros, Jose R. Isasi, and Issa KatimeCite this: Macromolecules 1993, 26, 26, 7256–7262Publication Date (Print):December 1, 1993Publication History Published onl…
The mesomorphic properties of homologous series of 2,5-bis(4-alkoxybenzylidene)cyclopentanones, 2,6-bis(4-alkoxybenzylidene)cyclohexanones, and 2,7-bis(4-alkoxybenzylidene)cycloheptanoneshave been compared with each other. The clearing point is markedly depressed by increasing the size of the cycloalkanone ring. The c…
The elastic properties of two-dimensional networks under tension are studied by the mean-field approximation and Monte Carlo simulation. The networks are characterized by fixed (polymerized) connectivity and either a square-well or a Hooke's-law interaction among their components. Both self-avoiding and phantom networ…