Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of amorphous polymers. 2. Anomalous temperature dependence of the steady-state recoverable compliance in low-molecular-weight polymersK. L. Ngai, D. J. Plazek, and C. A. BeroCite this: Macromolecules 1993, 26, 5, 1065–1071Publication Date (Print):Marc…
Abstract Oxidation of pyrrole yields a charged polymer film with incorporated anions. During the following reduction electroneutrality can be maintained by expulsion of these anions or by incorporation of cations. The contribution of both processes to the overall charge transport is found to depend strongly on the for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum thiolate complexes of porphyrin as excellent initiators for Lewis acid-assisted high-speed living polymerization of methyl methacrylateTakato Adachi, Hiroshi Sugimoto, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1993, 26, 6, 1238–1243Publication Date (Pri…
Two short VN bonds and a long NN bond, as well as a sodium atom that is situated in the cavity created by the VNNV unit and two mesityl (mes) ligands are the intriguing characteristics of the anion of complex 1. It is formed by the reduction of [V(mes)3(thf)] with Na under N2 and on protonation yields NH3 and N2H4.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeochemical origins of sedimentary benzoporphyrins and tetrahydrobenzoporphyrinsTimothy D. LashCite this: Energy Fuels 1993, 7, 2, 166–171Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/do…
In order to find out the cathode material suitable to vacuum microelectronics devices, dependence of cathode material of field emitters was investigated with respect to the emission characteristics. Since the field emitters for vacuum microelectronics devices are fabricated by thin film processes, the characteristics…
Abstract Die Struktur und die Elektronendichte der closo ‐Bor‐Cluster B 4 X 4 (X = Br, I), B 6 X 6 2− (X = H, Cl, Br, I) und B 12 H 12 2− wurden mittels Pseudopotential‐Hartree‐Fock‐Rechnungen bestimmt. Die Interpretation der Bindungsverhältnisse erfolgte durch Auswertung der Elektronen‐Lokalisierungs‐Funktion (ELF).…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanine aggregates on metal dichalcogenide surfaces: dye sensitization on tin disulfide semiconductor electrodes by ordered and disordered chloroindium phthalocyanine thin filmsL. K. Chau, C. Arbour, G. E. Collins, K. W. Nebesny, P. A. Lee, C. D. England, N. R. Armstr…
<div class="htmlview paragraph">Ceria has become an increasingly important component in automotive exhaust catalysts over the past decade. Recently, with the proposal that measurements of oxygen storage be used for the on-board evaluation of catalyst performance for both low emission vehicles (LEV) and non-LEV v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas permeation and selectivity of poly(organophosphazene) membranesHarry R. Allcock, Constance J. Nelson, William D. Coggio, Ian Manners, William J. Koros, David R. B. Walker, and Luiz A. PessanCite this: Macromolecules 1993, 26, 7, 1493–1502Publication Date (Print):March 1,…
Dense ceramics of Pb(Fe 1/2 Nb 1/2 )O 3 with high resistivity were fabricated below 1000°C by making use of the hot-pressing technique. For these hot-pressed specimens, measurements of the spontaneous polarization, dielectric constants, electromechanical coupling factors, piezoelectric constants and elastic compliance…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Yalda Farhoudi, Alejandro D. Rey; Shear flows of nematic polymers. I. Orienting modes, bifurcatio…
The central gallium(III) ion propagates the pairwise ferromagnetic exchange interactions between the S = 1/2 ligands in the title complex 1, which lead to an S = 3/2 ground state, as magnetic susceptibility measurements of 1 have shown. These types of complexes are important for the design of molecular ferromagnets. 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific molecular recognition via multipoint hydrogen bonding ubiquinone analogs - porphyrin having four convergent hydroxyl groups pairingTakashi Hayashi, Takashi Miyahara, Naomichi Hashizume, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1993, 115, 5, 2049–2051Publicati…
Applying the method of optically detected magnetic resonance (ODMR) via the magnetic circular dichroism (MCD) of absorption, paramagnetic resonance data are provided for the ground state of the intrinsic defect ${\mathrm{Bi}}_{\mathit{M}}$ in sillenites of the type ${\mathrm{Bi}}_{12}$M${\mathrm{O}}_{20}$ (M=Si, Ge, T…
Abstract The relative analyser transmission functions of two different XPS spectrometers (VG ESCA‐3 Mk II and SSI X‐Probe of Fisons) have been determined experimentally by several methods presented in the literature. The transmission function of the VG ESCA‐3 Mk II can be expressed as T ∝ E a ( E a / E k ) n , where n…
The conductivity and tensile strength of stretch-oriented, doped, crosslinked films of polyaniline are found to be considerably greater than those prepared from non-crosslinked films of the polymer. The conductivity of the former films show little dependence on molecular weight or degree of crosslinking whereas their…
Reaction mechanisms in the formation of PZT solid solution were studied under hydrothermal conditions (Pb/(Zr+Ti) = 1.0 to 1.9, Zr/Ti = 0/10 to 10/0, 1 M to 5 M KOH, 100° to 220°C, 2 h). A yellow tabular crystallite with tetragonal symmetry and Pb/Ti ∼ 2 was formed at 100° to 130°C. A PZT crystallite was formed just a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemisorption of nitric oxide on char. 2. Irreversible carbon oxide formationHsisheng Teng and Eric M. SuubergCite this: Ind. Eng. Chem. Res. 1993, 32, 3, 416–423Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 199…
A novel polyborosilazane was synthesized by reacting per‐hydropolysilazane with trimethyl borate. The chemical structure of this polymer was investigated by the techniques of infrared spectroscopy and nuclear magnetic resonance measurements. Amorphous silicon nitride was obtained by pyrolysis of this polymer in a stre…