Materials Literature
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Perovskite-type oxides containing transition metals are attracting great attention as catalysts for complete oxidation of hydrocarbons as well as electrochemical reduction of oxygen (1). A s far as I know, the use of perovskite-type oxides as catalysts was first reported by Meadowcroft in 1970 (2) for the electrochemi…
The syntheses, structures, and spectroscopic properties of some novel dodecaphenyl- and dodecaalkylporphyrins have been investigated with the aim of designing model compounds to aid in evaluating theoretical models of porphyrin nonplanarity. It was found that dodecaphenylporphyrin (3) and the dodecaalkylporphyrins 4a-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium measurements of oscillatory disjoining pressures in aqueous foam filmsV. Bergeron and C. J. RadkeCite this: Langmuir 1992, 8, 12, 3020–3026Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992http…
Proton exchange and subsequent dehydration of layered titanates with the formula A2TinO2n+1 (A = Na, K, Cs; 3 ≤ n ≤ 6) yield TiO2 (B) at temperatures below 350°C. In order to elucidate the mechanism of TiO2 (B) formation, we have characterized these reactions using thermal analysis and crystallographic techniques, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical applications of the bending beam method. 1. Mass transport and volume changes in polypyrrole during redoxQibing Pei and Olle InganaesCite this: J. Phys. Chem. 1992, 96, 25, 10507–10514Publication Date (Print):December 1, 1992Publication History Published onli…
Abstract The theoretical and experimental data on the breakup of droplets are reviewed. Several factors influence development of droplets: flow type and its intensity, viscosity ratio, elasticity of polymers, composition, thermodynamic interactions, time, etc. For Newtonian systems undergoing small, linear deformation…
The hemocompatibility of a polymer containing a phospholipid polar group, poly(2-methacryloyloxyethyl phosphorylcholine (MPC)-co-n-butyl methacrylate(BMA)), with human whole blood was evaluated. When human whole blood without an anticoagulant was contacted with polymers, the blood cell adhesion and aggregation on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of colloidal dispersions of fluorescent, monodisperse silica spheresA. Van Blaaderen and A. VrijCite this: Langmuir 1992, 8, 12, 2921–2931Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1…
A review is presented of the point defect model (PDM) for the growth and breakdown of passive films on metal and alloy surfaces in contact with aqueous solutions. The model provides a reasonable account of the steady‐state properties of cation‐conducting and anion‐conducting barrier layers on nickel and tungsten, resp…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTA new family of mesoporous molecular sieves prepared with liquid crystal templatesJ. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowicz, C. T. Kresge, K. D. Schmitt, C. T. W. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins, and J. L. SchlenkerCite this: J. A…
Anisotropic powders of Sm2Fe17Nx were prepared by the mechanical milling of Sm2Fe17 and nitriding. The effects of milling time, ball size, and heat treatment on the structure and magnetic properties have been studied. Short milling times resulted in particle attrition; disproportionation into a mixture of Fe and an am…
A systematic study of the effect of pressure up to 1 GPa on the spin reorientation transition (SRT) phenomena has been performed on several series of pseudoternary compounds (Er x R 1-x ) 2 Fe 14 B for R identical to Nd, Gd, Dy and Y using a low-field AC susceptibility technique. The variation in the SRT temperature T…
The selective chemical vapor deposition of the compounds, (hfac)CuL, where hfac=1,1,1,5,5,5-hexafluoroacetylacetonate and L=trimethylphosphine (PMe3); 1,5-cyclooctadiene (1,5-COD); vinyltrimethysilane (VTMS), and 2-butyne onto W in the presence of SiO2 has been studied as a function of surface pretreatment. Cleaning t…
The structure determination of apotransketolase and the comparison of its three-dimensional structure with that of the holoenzyme has revealed that no large conformational changes are associated with cofactor binding. Two loops at the active site are flexible in the apoenzyme which enables ThDP to reach its binding si…
By using the chemical shift in core-level photoemission from adsorbed species, we apply the technique of energy scan photoelectron diffraction to molecules containing nonequivalent atoms of the same element. As an example, we demonstrate the complete structural characterization of the surface acetate species on Cu{110…
The Ericksen-Leslie theory In this chapter we shall discuss the continuum theory of nematic liquid crystals and some of its applications. Many of the most important physical phenomena exhibited by the nematic phase, such as its unusual flow properties or its response to electric and magnetic fields, can be studied by…
Optical properties The unique optical properties of the cholesteric phase were recognized by both Reinitzer and Lehmann at the time of their early investigations which culminated in the discovery of the liquid crystalline state. When white light is incident on a ‘planar’ sample (whose optic axis is perpendicular to th…
This is a new and greatly revised edition of Professor Chandrasekhar's classic book Liquid Crystals, first published in 1977. The subject of liquid crystals has grown into an exciting interdisciplinary research field with important practical applications. This book presents a systematic and self-contained treatment of…
The degradation of the electrochromic film of a-WO<SUB>3</SUB> was investigated from the equilibrium state of different driving voltage and the time dependent emf was also obtained in an open or short circuit of zero volts. Based on the mechanism of activation and the principal of chemical reaction kinetics, the corre…
SiO2 thin films (1000-Å thick) were sputter deposited on GaAs substrates as a buffer layer in order to alleviate a thermal mismatching problem between ZnO films and GaAs substrates. Thermal stability of sputter-deposited ZnO films (0.5–2.0 μm thick) was tested on such a buffered GaAs substrate with a postdeposition he…