Materials Literature
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We have prepared novel colloidal polyaniline–silica composites by chemically polymerising aniline in the presence of small silica particles of 38 ± 7 nm diameter; these composites have been characterised by various techniques including thermogravimetry micoanalyses, scaning, electron microscopy, photon correlation spe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and phase separation in poly(methyl methacrylate)/poly(vinyl chloride) blends: study of thermodynamics by thermal analysisSunny Shen and John M. TorkelsonCite this: Macromolecules 1992, 25, 2, 721–728Publication Date (Print):January 1, 1992Publication History Pub…
The scanning electrochemical microscope has been used to probe the diffusion layer by measuring the potential difference between a large reference electrode located in the bulk of the solution and a microindicator electrode positioned a few µm away from a substrate electrode. Ag microdiscs (10 and 50 µm diameter) have…
The infrared spectra of CO adsorbed at 77 K on sintered polycrystalline MgO and Ni/MgO, Co/MgO solid solutions, containing 10% nickel and cobalt in atoms are reported. These solids are properly designed for the estimation of the role played by d–π overlap in the bonding between the isolated transition-metal cations an…
Trialkylstannyltetrathiafulvalenes undergo palladium-catalysed cross-and homo-coupling reactions to give aryl-substituted tetrathiafulvalenes and bitetrathiafulvalene; the methodology has been applied to the synthesis of p-phenylenebistetrathiafulvalene and 2,5-thiophenediylbistetrathiafulvalene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin-film processing and optical properties of conjugated rigid-rod polyquinolines for nonlinear optical applicationsAshwini K. Agrawal and Samson A. JenekheCite this: Chem. Mater. 1992, 4, 1, 95–104Publication Date (Print):January 1, 1992Publication History Published online…
The complete amino acid sequence of glutamate dehydrogenase from the thermoacidophilic archaebacterium Sulfolobus solfataricus has been determined. The sequence was reconstructed by automated sequence analysis of peptides obtained after cleavage by trypsin, cyanogen bromide, Staphylococcus aureus V8 protease and pepsi…
A novel approach for designing optimal multilayer filters based on a real-coded genetic algorithm is presented. Given the total number of layers in the filter, as well as the electrical properties of the materials constituting each layer, the algorithm iteratively constructs multilayers whose frequency response closel…
The generation of quantised-state (Q-state) particles of CdS, CdSe, CdTe, CdSxSe1–x, CdSxTe1–x and CdSexTe1–x in polymerized nonacosa-10, 12-diynoic acid Langmuir–Blodgett (LB) films is described. The use of mixed surfactants and mixed counterions Cd2+ and Ca2+ in the LB films is shown to influence the size of the par…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanoscale platinum(0) clusters in glassy carbon: synthesis, characterization, and uncommon catalytic activityNicolas L. Pocard, Daniel C. Alsmeyer, Richard L. McCreery, Thomas X. Neenan, and Matthew R. CallstromCite this: J. Am. Chem. Soc. 1992, 114, 2, 769–771Publication Da…
Pt black catalysts have been characterized by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). The spectra measured after standard purification (O2 and H2 at 600 K) compared well with those of a purified reference Pt foil. All samples exhibited pronounced Fermi-edge intensities…
The anomalous initial reduction peak in cyclic voltammograms of polypyrole in acetonitrile has been shown, by impedance spectroscopy and X-ray emission analysis, to be due to the uptake of cations. Reoxidation is accompanied by anion uptake. As a result of these two processes, polypyrrole that has been electrochemical…
A method is presented, which allows, with a minimum of assumptions, the determination of the molar absorption coefficients of the coloured form of photochromic compounds and their forward and reverse quantum efficiencies. The approach used combines a modified Fischer's method with an improved intensity variation techn…
Two [2]rotaxanes, composed of (i) a polyether chain intercepted by (a) one centrally-located and (b) two symmetrically-located π-electron-rich hydroquinol rings and terminated by free-base and metallated (Zn) tetraaryl-porphyrin groups respectively and (ii) a tetracationic cyclophane constructed of two π-electron-defi…
The microstructure of porous silicon layers has been studied by means of x-ray diffraction. Using a double-crystal diffractometer, the observed diffraction patterns give directly the mismatch between the lattice parameters of the porous layers and of the substrate, and the curvature of various porous silicon samples o…
The mesophases of several oddly shaped mesogenic diamides of 1,3‐diaminobenzene, substituted with three methyl groups in positions 2,4,6 or by a methyl and a tert‐butyl group in positions 2,5 have been studied by X‐ray diffraction. Limello‐columnar and uncommon nematic mesomorphic ordering have been observed and the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic Lewis acid host - halide ion guest species. Complexes of iodide ionXiaoguang Yang, Carolyn B. Knobler, and M. Frederick HawthorneCite this: J. Am. Chem. Soc. 1992, 114, 1, 380–382Publication Date (Print):January 1, 1992Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA possible mechanism for swelling of polymer brushes under shearJean Louis BarratCite this: Macromolecules 1992, 25, 2, 832–834Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.10…
Optical properties of microcrystalline Si embedded in a SiO 2 matrix through a partial oxidation of anodized porous silicon using a wet process have been studied. Thick (∼30 µm) films thus obtained were dark red to light yellow in color, depending on the oxidation condition. The fundamental edge of the absorption spec…
All articles of this category The design and synthesis of a molecular shuttle, in which the two components are a cyclobis(paraquat- p -phenylene) macro-cycle and a linear polyether chain intercepted by two symmetrically-located hydroquinol units around a central bis(2-oxypropylenedithio)tetrathiafulvalene residue, and…