Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Bulk liquid crystal alignment can be completely determined by the orientational distribution of the surface monolayer. The bulk pretilt angles predicted from the measured monolayer orientational distribution using the Landau-de Gennes formalism agree very well with the observed values. Surface anchoring energies can a…
Abstract High‐temperature molding of Brabender‐mixed blend of polyacrylic acid (PAA) and epoxidized natural rubber (ENR) causes thermally induced crosslinking between PAA and ENR. Studies on Monsanto rheometry of the blend and physical properties, solvent swelling, and dynamic mechanical properties of the molded blend…
The room-temperature photoluminescence and structure were studied concerning porous silicon which was exposed to ambient air. Water vapor in ambient air gradually oxidized the surface of the porous silicon with developing Si—O—Si bonds. This room-temperature oxidation progressively replaced an unstable H-passivated su…
We have analyzed red and blue luminescence from porous silicon as a function of oxidation parameters and feature dimension determined with an atomic force microscope. We have found correlation between blue luminescence intensity and the increase in feature size caused by oxidation. We have further shown that blue lumi…
We present a statistical-mechanical theory of the formation of a macroscopic random network built from elementary units. These units represent atoms or small molecules that can form up to p permanent covalent bonds. As the number of formed bonds is increased, we observe a continuous phase transition from a fluid phase…
Here we study the dynamics of a bubble or drop as it is driven by a pressure gradient through a capillary tube. For the case of a straight capillary, the drop can either approach a steady-state shape or the rear of the drop develops a re-entrant cavity. Also, depending on the initial conditions, the drop can break apa…
General objectives experimental methods measures for the polymer concentration segment-molar excess Gibbs free energies how to use the data tables vapour pressures of binary polymer solutions Redlich-Kister parameters for the segment-molar excess Gibbs free energies of binary polymer solutions weight fraction Henry-co…
The performance factors which will influence the market acceptance of electrochromic windows are reviewed. A set of data representing the optical properties of existing and foreseeable electrochromic window devices was generated. The issue of reflective versus absorbing electrochromics was explored. This data was used…
The paper presents the results of a study investigating the energy performance of electrochromic windows under a variety of state-switching control strategies. We used the DOE-2.1E energy simulation program to analyze the annual cooling, lighting, and total electricity use and peak demand as a function of glazing type…
Minimum inhibitory concentration (MIC) studies were conducted to observe synergistic, antagonistic or additive effects produced by combinations of butyl paraben, ethyl paraben, methyl paraben, and propyl paraben against mycelial growth of mycotoxigenic species of Aspergillus, Fusarium, and Penicillium. On an individua…
Abstract Reactive melt‐processing of poly(styrene‐ co ‐maleic anhydride) (SMA) with primary N ‐alkylamines was carried out in one step in a twin‐screw extruder. Ring formation of the imide occurred within the residence time of the extruder, at temperatures exceeding 220°C and with an excess of primary amines. The incr…
Abstract Surface grafting of polymeric materials, such as films and fibers, may improve their reactive surface properties. Polypropylene active sites that should initiate a surface postgrafting can be formed by either nitrogen cold plasma or an electron‐beam irradiation. The plasmamodified polymer surface is cross‐lin…
We report results from cathodoluminescence spectroscopy of boron nitride films grown on Si(100) substrates by ion-source-assisted magnetron sputtering of a hexagonal BN target. Three main peaks are observed in the near-band-gap region for hexagonal boron nitride films at energies of 4.90, 5.31, and 5.50 eV. We also re…
Microcrystalline silicon (μ-Si) thin films were anodized in dilute HF solutions in the same manner as forming porous materials. It is demonstrated for the first time that the anodized μ-Si thin films show strong violet luminescence (415 nm) at room temperature. Visible green and red emissions were also observed accomp…
Calorimetric and optical reflectivity studies on free-standing partially fluorinated liquid-crystal films have revealed novel melting phenomena. The smectic-$A$-isotropic transition occurs through a series of layer-thinning transitions, causing the films to thin in a stepwise manner as the temperature is increased. Th…
We have performed molecular dynamics simulations of a supercooled atomic liquid. The self-intermediate-scattering function in the $\ensuremath{\beta}$-relaxation regime has a power-law time dependence and temperature dependence consistent with the mode-coupling-theory prediction of a von Schweidler law, with exponents…
In an effort to prepare crystals and determine the structure of alpha-thrombin complexed to a synthetic peptide inhibitor (MDL-28050) of the hirudin 54-65 COOH-terminal region, it was discovered that the crystals were not those of the complex but of gamma-thrombin. Gel electrophoresis studies revealed that autolytic d…
In a simple one-pot reaction the host-guest compounds 1 (white spheres FeIII; black = FeII; gray = NH; angled rods = 2: R = Me, Et) are accessible in gram quantities by self-assembly. They are the only fully characterized redox isomers whose cyclic voltammograms display four quasi-reversible waves and whose mixed-vale…
The substitution pattern determines whether distilbenylazobenzene compounds 1 or their subsequent products, the dihydrocinnolines 2, are isolated in the cobalt-catalyzed solvent-free reaction of azo compounds with diphenylacetylene. For several derivatives a photochromic equilibrium exists between the two forms.
No bonding interactions exist between the three interpenetrating framework structures in 1, and all of the two-dimensional networks are constructed by coordinate linkages-these two principles describe the structure of 1 (shown schematically on the right). Compound 1 was prepared from K2[Cd(CN)4], Ag-NO3, and pyrazine…