Materials Literature
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Review: Organic conducting materials show potential for applications in, for example, electrostatic shielding or in pressure sensing. In the past, research aimed at the optimization of the properties of these materials e.g. the charge‐transfer (CT) complex tetrathiafulvalene/tetracyanoquinodümine (TTF/TCNQ, see figure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, redox behavior, and magnetic and spectroscopic properties of copper(II)copper(II)copper(II), copper(II)nickel(II)copper(II), and copper(II)palladium(II)copper(II) species. Crystal structure of [L2Cu2Cu(dmg)2Br]ClO4.cntdot.CH3OH (L = 1,4,7-trimethyl-1,4,7-triazacyc…
Polarized light leads to an effective reorientation of the optic axis in the glassy state of liquid-crystalline side chain polymers containing azobenzene mesogenic groups, via a trans-cis and cis-trans isomerization. Using a combination of U V and IR dichroitic studies it is shown for copolymers consisting of chromoph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiempirical theory of relaxation: concentrated polymer solution dynamicsJack F. Douglas and Joseph B. HubbardCite this: Macromolecules 1991, 24, 11, 3163–3177Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https…
S.559-566 : Abb.,Tab.
Electronic applications of semiconductor diamonds are addressed. Doping and electrical properties of these films, formation of low-resistive 'ohmic' contacts, surface modification methods, and experimental device applications are discussed. Of particular interest are high-temperature (300 degrees C) MOSFETs and metal…
Abstract The synthesis of methanol from CO2 and H2 in a flow reactor was studied over CuO–ZnO catalysts combined with ZrO2, MgO, Al2O3, or Cr2O3 under a presssure of 13 atm. CuO–ZnO–Al2O3, CuO–ZnO–ZrO2, and CuO–ZnO–MgO showed higher activity and higher selectivity for methanol than did CuO–ZnO. The selectivity for met…
The effect of grain size on the mechanical properties of metastable Ti–15V–3Cr–3Sn–3Al β titanium alloy has been investigated. In the solution annealed condition the small grain sized specimens are of strength higher than the large grain sized specimens. However, when the alloy is aged the large grain sized specimens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and electrical response of single-ion conducting network polymers based on sodium poly(tetraalkoxyaluminates)Kate E. Doan, M. A. Ratner, and D. F. ShriverCite this: Chem. Mater. 1991, 3, 3, 418–423Publication Date (Print):May 1, 1991Publication History Published on…
The chemical reaction at room temperature between calcium aluminate cement (CAC) and NH 4 H 2 PO 4 ‐based fertilizer solution causes the formation of ammonium calcium pyrophosphate (AmCPP) as an amorphous cementitious phase. This phase was responsible for the development of strength in rapid‐setting phosphate‐bonded c…
Abstract Based on the data reported in this paper, it is evident that the zinc salts of acrylic acid and methacrylic acid are effective coagents for the peroxide curing of EPDM and NBR. They appear to be unique among coagents in their ability to maintain high elongation while increasing the hardness and tensile proper…
The use of ultraviolet (UV)/ozone treatment for the removal of hydrocarbon contamination is discussed for a number of substrates involving complex composition or geometries. Treatment of gold and silicon dioxide surfaces in a reactor attached on line to an x-ray photoelectron spectrometer showed that the chemistry of…
Electron microscopy observations were made on Zr polycrystals deformed at room temperature. Deformation substructure consists of ⅓〈1120〉 dislocations mostly in screw orientations, ⅓〈1123〉 dislocations on {1011} planes, and deformation twins with a small volume fraction. The observed configurations of the ⅓〈1123〉 dislo…
The electric modulus representation is used to display conductivity and dielectric relaxation occurring in poly(propylene glycol)-4000 (PPG) complexed with LiCF3SO3, as the ether oxygen to lithium (O:Li) ratio is varied from 300:1 to 12:1. The frequency range covered is 10 to 107 Hz. Results are obtained for temperatu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of cellulose monoacetates: the relationship between structure and water solubilityCharles M. Buchanan, Kevin J. Edgar, and Alan K. WilsonCite this: Macromolecules 1991, 24, 11, 3060–3064Publication Date (Print):May 1, 1991Publication History…
A series of 1,2-phenylene bis[4-(4-alkoxybenzylideneamino)benzoates has been prepared in order to establish that the nonlinear molecular structure is not necessarily incompatible with mesophase formation. The phases appearing in the methoxy and ethoxy derivatives are classical nematic. While the propoxy to octyloxy de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of cellulose [1-carbon-13]acetates and determination of monomer composition by NMR spectroscopyCharles M. Buchanan, Kevin J. Edgar, John A. Hyatt, and Alan K. WilsonCite this: Macromolecules 1991, 24, 11, 3050–3059Publication Date (Print):May 1, 1991Publication H…
The collapse of a spherical vapour cavity in the vicinity of a compliant boundary is examined numerically. The fluid is treated as a potential flow and a boundary-element method is used to solve Laplace's equation for the velocity potential. Full nonlinear boundary conditions are applied on the surface of the cavity.…
From the compositional dependences of the lattice parameters in the system ${\mathrm{LiV}}_{1\mathrm{\ensuremath{-}}\mathrm{y}}$Cr $_{\mathrm{y}}\mathrm{O}_{2}$, a critical V-V separation ${\mathrm{R}}_{\mathrm{c}}$=2.90\ifmmode\pm\else\textpm\fi{}0.01 \AA{} has been determined for an array of octahedral-site ${\mathr…
Radiation damage in h.c.p. metals is significantly different from that in f.c.c. or b.c.c. metals. In the latter metals, loops that are primarily interstitial in nature simply form on the close-packed planes, {111} for f.c.c. and {110} for b.c.c. The loops may then shear into configurations of lower energy, that is un…