Materials Literature
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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…
Scanning tunneling microscopy reveals that microscopic roughness inherently exists at the smoothest of metal surfaces. Mathematical modeling indicates that the passive film on the concave region of the surface is subject to higher‐than‐average electrostatic pressure and is, therefore, a preferred site for passive film…
In recent years remagnetization of orogenic belts has been explained by fluid migration through rocks undergoing deformation. A laboratory study of remagnetization is presented in which varying amounts of iron (0–13.5 weight per cent Fe<inf>2</inf>O<inf>3</inf>) are adsorbed onto smectite surfa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of a low-molecular-weight plasticizer on the thermal and viscoelastic properties of miscible blends of bacterial poly(3-hydroxybutyrate) with cellulose acetate butyrateGiuseppina Ceccorulli, Maria Pizzoli, and Mariastella ScandolaCite this: Macromolecules 1993, 26, 25…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe potassium promoter function in the oxidation of graphite: an experimental and theoretical studyChristoph Janiak, Roald Hoffmann, Peter Sjovall, and Bengt KasemoCite this: Langmuir 1993, 9, 12, 3427–3440Publication Date (Print):December 1, 1993Publication History Publishe…