Materials Literature
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During weaving, warp yams are subjected to dynamic loading before stress relaxation during a loom stop. A test method is presented for simulating this behavior. There are three types of relaxation curves—simple relaxation, inverse relaxation, and mixed relaxation—depending on the previous load history of the yam. One…
Abstract A combined optical and electron microscopical study has been carried out of the crystallization habits of poly(vinylidene fluoride) (PVF 2 ) when it is crystallized from blends with noncrystallizable poly(ethyl acrylate) (PEA). The PVF 2 /PEA weight ratios were 0.5/99.5,5/95, and 15/85. Isothermal crystalliza…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetism and the .alpha. and .beta. polymorphs of anhydrous copper(II) formate: two molecular-based ferromagnets with ordering temperatures of 8.2 and 30.4 KFernando Sapina, Marcelino Burgos, Emilio Escriva, Jose Vicente Folgado, Dolores Marcos, Aurelio Beltran, and Da…
The influence of heat treatment on corrosion behavior of magnesium-aluminum (Mg-9Al) alloys was investigated by studying the electrochemical properties of Mg-9Al in the solution-treated (T4) and artificially aged (T6) conditions. The alloys' properties were compared to those of pure Mg, the intermetallic Mg17Al12 phas…
We report the results of computer simulation studies for a bulk system composed of chiral particles interacting via the Gay-Berne potential and an additive chiral potential. Using Monte Carlo (MC) simulations in the NVT ensemble, the chirality-temperature plane of the phase diagram was studied at different points by a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionalization of poly(aryl ether ether ketone) (PEEK): synthesis and properties of aldehyde and carboxylic acid substituted PEEKFei Wang and Jacques RooversCite this: Macromolecules 1993, 26, 20, 5295–5302Publication Date (Print):September 1, 1993Publication History Publ…
The POU domain is a highly conserved region found in a number of transcription factors and products of developmental control genes. We report here the isolation and characterization of a POU domain-containing cDNA (POU-M1) from the middle silk gland of Bombyx mori. It encodes a protein with a POU domain identical to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, synthesis, and structure of the largest trimetallic cluster, [(Ph3P)10Au12Ag12PtCl7]Cl: the first example of a trimetallic biicosahedral supracluster and its implication for the vertex-sharing polyicosahedral growth of the gold/silver/platinum ternary cluster systemB…
A formulation for calculating frequency-dependent hyperpolarizabilities in the Mo/ller–Plesset perturbation theory is presented as the correlation correction to the TDHF approximation. Our quasienergy derivative (QED) method is applied, and the difference between the QED method and the pseudoenergy derivative (PED) me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected disproportionation mechanism for proton-transfer reactions between 17-electron metal hydride cation radicals and neutral 18-electron metal hydridesKjell Tore Smith, Christian Roemming, and Mats TilsetCite this: J. Am. Chem. Soc. 1993, 115, 19, 8681–8689Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEarly transition metal porphyrins: synthesis, characterization, and reactivity of novel out-of-plane cis-ligated zirconium porphyrin derivativesHolger Brand and John ArnoldCite this: Organometallics 1993, 12, 9, 3655–3665Publication Date (Print):September 1, 1993Publication…
Polymer layers can cause memory alignment of nematic liquid crystals. We describe an experimental method to characterize this effect. We studied the temperature dependence of the memory alignment on polyvinyl alcohol coatings. We also investigated the influence of the time span during which the memory alignment is gen…
A theory is presented to describe the effects of particle shape, orientation, and volume fraction on the anisotopic viscosities of concentrated colloidal dispersions. We start with Stokesian dynamics; a particle-shape tensor is derived from the analysis, which is then included in a fluid lattice model for the determin…
MgIn 2 O 4- X thin films were deposited onto a silica glass plate by the RF sputtering method. The highest conductivity observed for the film post-annealed under H 2 flow was 2.3×10 2 S/cm, with a carrier concentration of 6.3×10 20 cm -3 and a mobility of 2.2 cm 2 ·V -1 ·s -1 . No distinct optical absorption band was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst reversible electrogeneration of triply oxidized nickel porphyrins and porphycenes. Formation of nickel(III) .pi. dicationsKarl M. Kadish, Eric Van Caemelbecke, Pierre Boulas, Francis D'Souza, Emanuel Vogel, Michael Kisters, Craig J. Medforth, and Kevin M. SmithCite thi…
A new nondestructive readout method was proposed for photochromic rewritable memory media. When the medium has a thermal threshold in the writing process with a λ 1 laser, reading using two lasers having emission lines at λ 1 and λ 2 , which correspond to absorption bands of the two isomers, makes it possible to keep…
Thermal degradation behaviors for homo- and copolymers of methacrylates prepared by stereospecific living polymerizations as well as radical polymerization were studied. Thermal stability of radically prepared PMMAs can be improved by careful control of end groups and by incorporation of methyl acrylate into the chain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon aerogel composite electrodesJoseph. Wang, Lucio. Angnes, Haim. Tobias, Rebecca A. Roesner, Keith C. Hong, Robert S. Glass, Fung Ming. Kong, and Richard W. PekalaCite this: Anal. Chem. 1993, 65, 17, 2300–2303Publication Date (Print):September 1, 1993Publication History…
Abstract Polymer-protected Cu/Pd bimetallic colloids with different atomic ratio of Cu to Pd were successfully prepared by refluxing a glycol solution of hydroxide of copper and palladium in the presence of poly(N-vinyl-2-pyrrolidone). The TEM, XRD, AAS and UV-vis spectrum measurements indicate the formation of bimeta…
Chemical vapor deposition (CVD) and electrochemical vapor deposition (EVD) have been applied to deposit yttria‐stabilized‐zirconia (YSZ) on porous ceramic media. The experimental results indicate that the location of YSZ deposition can be varied from the surface of the substrates to the inside of the substrates by cha…