Materials Literature
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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…
The catalytic (C) subunit of cAMP-dependent protein kinase interacts with two classes of inhibitors. The regulatory (R) subunits, types I and II, associate to form an inactive holoenzyme complex that is activated in response to cAMP. The C-subunit is also inhibited by small heat-stable protein kinase inhibitors (PKI's…
Scaling relations are developed to allow estimation of the atomic hydrogen concentration at the substrate during diamond chemical-vapor deposition for both diffusion-dominated and convection-dominated reactors. In the convection-dominated case, it is shown that there exists an optimal Mach number which maximizes the H…
This review shows that the permeability of soils decrease because exchangeable sodium causes aluminosilicate clay minerals to swell and disperse in water. Among common soil minerals, only smectites with a high percentage of exchangeable Na show extensive swelling. Illites often remain dispersed in solutions of high el…
( CeO 2 ) 0.8 ( SmO 1.5 ) 0.2 (CSO) has been suggested for solid oxide fuel cell (SOFC) applications, because of its higher electrical conductivity and chemical stability, compared to other ceria‐based materials. However, CSO is difficult to densify under conditions compatible with other SOFC components. A thin film s…
Experiments are performed on axisymmetric spreading of viscous drops on glass plates. Two liquids are investigated: silicone oil (M-100), which spreads to ‘infinity’, and paraffin oil, which spreads to a finite-radius steady state. The experiments with silicone oil partly recover the behaviour of previous workers’ dat…
Thermoreflectance measurements performed for the first time on laser diode mirrors have supplied a vast amount of novel information. Heating efficiency has been found to depend sensitively on the mirror treatment, the mirror structure design, the geometry of a deposited heat spreader, the type of coupling of the laser…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ Raman spectroscopy of peroxide ions on barium/magnesium oxide catalystsJack H. Lunsford, Xueming Yang, Kristjan Haller, Jaan Laane, Gerhard Mestl, and Helmut KnoezingerCite this: J. Phys. Chem. 1993, 97, 51, 13810–13813Publication Date (Print):December 1, 1993Publica…