Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUrethanes and polyurethanes bearing furan moieties. 4. Synthesis, kinetics and characterization of linear polymersSami Boufi, Mohamed Naceur Belgacem, Joel Quillerou, and Alessandro GandiniCite this: Macromolecules 1993, 26, 25, 6706–6717Publication Date (Print):December 1,…
Nitrogen (N) alloying was found to inhibit active dissolution and to introduce a secondary loop with fluctuating currents in the anodic polarization curve of type 316LN stainless steel (SS) (UNS S31653) in 1 N hydrochloric acid (HCl) solution. Potentiostatic tests in this potential range confirmed the occurrence of cu…
A systematic Raman-scattering investigation has been carried out on sol-gel alumina prepared by the hot-water hydrolysis and condensation of Al(${\mathrm{OC}}_{4}$${\mathrm{H}}_{9}$${)}_{3}$, the Yoldas process, as a function of process variables such as the time spent in the sol phase. Nanocrystalline boehmite, \ensu…
We present a new numerical method for the solution of the problem of diffraction of light by a doubly periodic surface. This method is based on a high-order rigorous perturbative technique, whose application to singly periodic gratings was treated in the first two papers of this series [ J. Opt. Soc. Am. A10, 1168, 23…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequential protonation of meso-[p-(dimethylamino)phenyl]porphyrins: charge-transfer excited states producing hyperporphyrinsEmmanuel C. A. Ojadi, Henry Linschitz, Martin Gouterman, Robert I. Walter, Jonathan S. Lindsey, Richard W. Wagner, P. R. Droupadi, and Wending WangCite…
Raman scattering studies were carried out to investigate the effects of ion implantation on the structure of diamond, graphite, and polymers. Carbon phases produced by chemical vapor deposition (CVD diamond) and rf discharge (diamondlike carbon or DLC) were also analyzed. Two types of amorphous carbon phases were dist…
Abstract In the present work, we have tested the consistency and validity of the Tougaard, Shirley and straight‐line methods for determination of peak intensities in XPS. Intensities were determined from essentially all photoelectron peaks (with Mg Kα and Al Kα radiation) from seven polycrystalline elemental solids (C…