Materials Literature
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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…
Copper ions are exchanged in mordenite in amounts in excess of the value expected from stoichiometric considerations in the process of repeated ion-exchange of sodium ions in mordenite with copper ions. This is not the case for nickel and calcium ions used as exchanger ions. A series of experiments was designed to elu…
It is shown that significant improvements in partial discharge (PD) measurement can be achieved through the use of ultrawideband (UWB) coupling techniques. These enhancements are principally in the areas of increased sensitivity, external noise rejection, and better understanding of the physics of the PD process. Exam…
Angular magnetoresistance oscillations have been studied systematically for β-(ET)2 IBr2 in the magnetic field rotating in a series of planes perpendicular to the conducting (a, b)-plane. The oscillations have been found in all studied planes. The shape of the Fermi surface transverse cross-section has been reconstruc…
In this paper, we present a new kind of bistable liquid crystal display (Filled Nematic) using static light scattering, and its application as a high resolution laser-addressed display. The new material consists of small inorganic particles dispersed in a nematic liquid crystal. In dispersion the particles form intern…
Термодинамика изотропных двухфазных систем.2.2.Термодинамика кристаллов в равновесии с расплавом или паром.2.3.Термодинамика малых частиц с сохраняющимся числом атомов.2.4.Атомная модель кристалла в вакууме и химический потенциал его атомов.2.5.Плавление и квазиплавление малых частиц.3. Плотность уровней и характерные…
Looking at recent advances in the area of elastomers and rubber-like elasticity, this monograph reviews and evaluates existing elastomers and presents some new results.
A multi-ion-beam reactive sputter (MIBERS) deposition technique was devised to grow ferroelectric lead zirconate titanate (PZT) thin films of different compositions (Zr/Ti ratios of 50/50 and 56/44) from individual metal targets of Pb, Zr, and Ti. This technique offers a highly controllable deposition process allowing…
Computational simulation procedures are used to identify the key deformation mechanisms for (0)(sub 8) and (90)(sub 8) SiC/Ti-15 metal matrix composites. The computational simulation procedures employed consist of a three-dimensional finite-element analysis and a micromechanics based computer code METCAN. The interpha…
A characteristic wavy-line texture of zinc ferrite (ZnFe2O4) has been formed on the surface of Fe2O3 particles by solid-state reaction between α-Fe2O3 and ZnO particles. The wavy lines were confirmed as having the ferrite composition. The texture was formed by an initial rapid interface reaction followed by the wideni…