Materials Literature
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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…
This paper describes the main cause of crosstalk in a cylindrical type rotary transformer by using the electromagnetic field analysis taking account of both the eddy current and the displacement current. Factors affecting the crosstalk of the rotary transformer are also discussed, namely, the permeability and permitti…
An extended Hückel calculation was employed to calculate the change in the electron density on the Si–O back bonds and the total electronic energy during the reaction at the SiO 2 film surface. We demonstrate that the desorption of SiF 4 occurs as follows: (1) bifluoride ( HF 2 - ) ions dissociate into HF monomers and…
Abstract A redetermination of the crystal structure of ganomalite, with composition Pb 9 Ca 5.44(1) Mn 0.56(1) Si 9 O 33 , using new single crystal X-ray diffraction data is reported. Hexagonal space group symmetry P [unk], with Z = 1 and unit cell parameters a = 9.8456(3) Å and c = 10.1438(4) Å. The refinement of a s…
Resistivity and adhesive strength were measured for the thin films 450 A Cr-1800 A Au, 450 A Cr-1000 A Mo-1800 A Au, 450 A Cr-1000 A Ni-1800 A Au, 450 A Mo-1800 A Au, 1800 A Au, and 2000 A Al on z-and AT-oriented single crystal quartz substrates in the as-deposited condition as well as after thermal annealing at 380 d…
Abstract A time‐based model for the water‐influenced dielectric aging of FRP is presented, using chemical mechanisms to explain the measured increase of the loss tangent and the dielectric constant as well as the interphase orientation of the electrical breakdown channel in FRP insulators. Although this hypothesis is…