Materials Literature
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The deformation behavior of poly(ether ester) is studied by means of small- and wide-angle X-ray scattering (SAXS and WAXS). The material under investigation represents a polyblock thermoplastic elastomer of poly(ether ester) (PEE) type. It comprises poly(butylene terephthalate) (PBT) as hard segments and polyethylene…
We present a computer simulation study of the liquid-vapor interface of the Gay-Berne fluid model for a range of temperatures above and below the vapor-isotropic liquid-nematic triple point. The molecular elongation is \ensuremath{\kappa}=3, and two values of the energy anisotropy parameter (${\mathrm{\ensuremath{\kap…
The interaction between two plates coated by adsorbed polymer layers is considered theoretically in the marginal solvent regime. A novel mean-field approach that takes into account the effect of chain ends is proposed. The approach generalizes the well-known ground-state dominance theory. It is shown that the effect o…
Transesterification mechanisms and rate in blends of polycarbonate (PC) and random liquid crystalline polyester copoly(oxybenzoate− p -terephthalate) at molar ratio 40/60 (P46) were studied through a five-component diad analysis and with 13 C and 1 H− 13 C nuclear magnetic resonance spectroscopy. It was found that the…
The annealing of poly(aryl ether ether ketone) (PEEK) from the glassy state was investigated by time-resolved simultaneous small-angle (SAXS) and wide-angle (WAXS) X-ray scattering using synchrotron radiation and by differential scanning calorimetry (DSC). Each experiment consisted of a heating ramp from 100 °C to the…
Reaction-induced phase separation of polymer blends was examined by optical microscopy in this work. Four distinct types of ordering processes were observed when a miscible polymer blend was photo-cross-linked in the one-phase region located between the coexistence curve and the glass transition temperatures. These st…
The natures of the pyrogenic alumina/silica (AS) surface and water adsorbed on AS were studied by 1 H NMR, infrared (IR), dielectric relaxation (DRS), and optical spectroscopies, thermally stimulated depolarization (TSD), and quantum chemical methods. An influence of the alumina content on the AS characteristics is no…
Recently, Geis et al. [J. Vac. Sci. Technol. B 14, 2060 (1996)] proposed a cold cathode emitter based on a Spindt-type design using a diamond film doped by substitutional nitrogen. The device is characterized by high field emission currents at very low power. Two properties, the rough surface of the metallic injector…
Based on our experimental findings of growth rate fluctuations during the crystallization of the protein lysozyme [Vekilov, Alexander, and Rosenberger, Phys. Rev. 54, 6650 (1996)], we have developed a numerical model that combines diffusion in the bulk of a solution with diffusive transport to microscopic growth steps…
Single-crystal X-ray analysis shows the lamellar phase of the vanadium oxide surfactant contains discrete decavanadate clusters and not a continuous vanadium oxide sheet. The clusters are hydrogen bonded together through water molecules forming layers. Between these layers long-chain surfactant chains of dodecyltrimet…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSolvent Effects on the Bond Length Alternation and Absorption Energy of Conjugated CompoundsJiali Gao and Cristobal AlhambraView Author Information Department of Chemistry State University of New York at Buffalo Buffalo, New York 14260 Cite this: J. Am. Chem. Soc. 1997…
The relation between the force exerted by long flexible polymer chains on a repulsive wall and the corresponding monomer density close to the wall is shown to imply a universal amplitude ratio. This is calculated in an \ensuremath{\varepsilon} expansion, and its importance in various situations is pointed out. These i…
Based on the density-functional theory, we show that the splay-bend surfacelike bulk elastic constant ${\mathrm{K}}_{13}$ is an artifact of the phenomenological as well as the gradient expansion construction of the curvature elastic free energy of nematic liquid crystals, while the saddle-splay constant ${\mathrm{K}}_…
The direct addition of nickel powder to the reaction mixtures of 1,3-dialkyl-4,5-dioxoimidazolidine-2-thione (1) with the thionation Lawesson reagent produces [Ni(II)(R(2)timdt(-))(2)] (R(2)timdt = 1,3-dialkylmidazolidine-2,4,5-trithione). These complexes belong to a new class of nickel-dithiolenes, showing remarkably…
The homogeneous and catalytic oxidative coupling of methane (OCM) for converting methane directly into higher hydrocarbons has been the subject of a large body of research. The present study on conversion of methane in dc corona discharge packed bed reactors may significantly improve the process economics. Experimenta…
The V 2 O 5 -based ZnO varistor materials were successfully densified using microwave sintering process. The materials can reach a high density as 94.6% T.D. (theoretical density) when sintered at 800 °C (10 min) but the grain growth was initiated only when sintered at a higher temperature than 1000 °C (10 min). The v…
The lability of the mononuclear octahedral complex tris(5-methyl-2-(1‘-methylbenzimidazol-2-yl)-pyridine)cobalt(II), [Co( 2 ) 3 ] 2+, is compared with the dinuclear triple-helical complex tris[bis[1-methyl-2-(5‘-methylpyrid-2‘-yl]benzimidazol-5-yl]methane]dicobalt(II), [Co 2 ( 1a ) 3 ] 4+ . [Co( 2 ) 3 ] 2+ undergoes r…
The corrosion resistance and electrochemical activity of boron‐doped, polycrystalline diamond thin films were evaluated before and after potentiodynamic cycling between −0.7 and 0.7 V vs. Ag/AgCl in 15 weight percent KOH. The maximum anodic current densities at 0.7 V ranged from 0.3 to 6.0 mA/cm 2 . Two types of corro…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation of Layered Silica−Dialkyldimethylammonium Bromide NanocompositesMakoto OgawaView Author Information PRESTO, Japan Science and Technology Corporation, and Institute of Earth Science, Waseda University, Nishi-waseda 1-6-1, Shinjuku-ku, Tokyo 169-50, Japan Cite this: L…
The Ar-ion-irradiation effects in the Al70Co15Ni15 decagonal quasicrystal (DQC) have been studied by means of transmission electron microscopy (TEM). The phase transformation behaviour is dependent on the dose, dose rate and the thickness of the specimen. The as-annealed Al70Co15Ni15 DQC consists of needle-like ordere…