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。
We present a simplified model for the colossal magnetoresistance in doped manganites by exactly solving a double-exchange model (with Ising-like local spins) and quenched binary disorder within dynamical mean field theory. We examine the magnetic properties and the electrical and thermal transport. Our solution illust…
The reactions of [M(PPh(3))(2)[S(2)C=C[C(O)Me](2)]] [M = Pd (1a), Pt (1b)] with AgClO(4) and PPh(3) or with [Au(PPh(3))(OCMe(2))]ClO(4) afford heterodinuclear [[M(PPh(3))(2)][M'(PPh(3))][S(2)C=C[C(O)Me](2)]]ClO(4) [M = Pd, M' = Ag (2a), M = Pt, M' = Ag (2b), Au (4)] or trinuclear [[M(PPh(3))(2)][M'(PPh(3))](2)[S(2)C=C…
Abstract The influence of microscale fillers on ethylene–propylene rubbers (EPR) was examined with respect to their vibrational damping capacity and viscoelastic properties. The vibrational damping and dynamic mechanical properties of reinforced EPR were studied in systematic and comparative ways that reinforced the e…
The cyclization kinetics of a poly(ethylene oxide) (PEO) chain ( M n = 3280; M w / M n = 1.05) labeled at both ends with pyrene was studied in toluene at several temperatures. Above 30 °C, the kinetics of pyrene excimer formation is well described by a two-state model. Below this temperature, a new excited species app…
The influence of the intermolecular potential on predicted growth morphologies is investigated. We compare the morphologies calculated with the attachment energy model for ε-caprolactam ( C 2/ c ), β-succinic acid ( P 2 1 / c ), hexamethylene tetramine ( I 4̄3 m ), pentaerythritol ( I 4̄), and urea ( P 4̄2 1 m ). Five…
Ethyl isocyanate has been introduced on prereduced and preoxidised Ag(2%)/Al2O3 catalysts and on Ag(2%)/SiO2 for comparison at 573 K. Its decomposition on preoxidised silica catalyst gives IR bands at 2294 and 2204 cm−1 whereas on prereduced catalyst vibrations at 2294 and 2243 cm−1 are observed. The 2294 cm−1 feature…
The dielectric properties of structurally monodomain, oxygen-isotope-exchanged ${\mathrm{SrTiO}}_{3}$ samples, $\mathrm{SrTi}{(}^{16}{\mathrm{O}}_{1\ensuremath{-}x}{}^{18}{\mathrm{O}}_{x}{)}_{3},$ were investigated. It was found that ferroelectricity is intrinsic to $\mathrm{SrTi}{(}^{16}{\mathrm{O}}_{1\ensuremath{-}x…
Metal nanoparticles play an important role in chemical vapor deposition (CVD) synthesis of carbon nanotubes because nanoparticles not only catalyze the nanotube growth but also determine the structural characteristics of the nanotubes. We report on the synthesis of single-wall carbon nanotubes (SWNTs) on the basis of…
Amorphous ${\mathrm{SiC}}_{x}{\mathrm{N}}_{y}$ films with various compositions were deposited by ion-beam sputtering. The bonding characteristics, Young's modulus, and density of the films were investigated using x-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, surface acoustic w…
Formalisms have been developed to express the time evolution of bimolecular processes taking place in fractal spaces. These ``stretched-second-order'' solutions are specifically applicable to radiation-induced electron-hole pairs and/or vacancy-interstitial pairs in insulating glasses. Like the analogous Kohlrausch-ty…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTExtremely Non-Planar Phthalocyanines with Saddle or Helical Conformation: Synthesis and Structural CharacterizationsNagao Kobayashi, Takamitsu Fukuda, Keiji Ueno, and Hiroshi OginoView Author Information Department of Chemistry, Graduate School of Science Tohoku Univer…
Zirconia is of great industrial importance as support for catalysts and as ion conductor. Especially when mechanical stability is needed in environments with varying temperature the tetragonal modification is superior, because of its high resistivity against physical shocks and thermal stresses. In this study density…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembled Arrays of Organic Nanotubes with Infinitely Long One-Dimensional H-Bond ChainsByung Hee Hong, Jin Yong Lee, Chi-Wan Lee, Jong Chan Kim, Sung Chul Bae, and Kwang S. KimView Author Information National Creative Research Initiative Center for Superfunctiona…
A series of nonempirical intermolecular potentials has been developed for the cyanuric chloride dimer, using the overlap model to determine the anisotropy of the repulsive wall around each atom. Calibration against intermolecular perturbation theory calculations enables the penetration and charge-transfer energy to be…
We present measured energy-loss spectra of nitrogen ions, which are scattered off a $(1\ifmmode\times\else\texttimes\fi{}2)$ missing row reconstructed Pt(110) single-crystal surface. The primary energy is varied from below 1 keV up to above 1 MeV, i.e., ${0.04v}_{0}<v<{2v}_{0}$ with ${v}_{0}$ the Bohr velocity.…
Abstract A study of butyl acrylate (BA) and vinyl acetate (VAc) solution homopolymerization and copolymerization in toluene was carried out. The conversion and copolymer composition were monitored using traditional techniques (gravimetry and 1 H‐NMR spectroscopy) and attenuated total reflectance‐Fourier transform IR (…
Abstract The thermal stability, crystallization behavior, and morphology of poly(vinyl butyral) (PVB) with differing compositions of vinyl alcohol and butyral units were investigated. It was found that the glass‐transition temperature of PVB decreases with increasing concentration of butyral units, mainly because of t…
We show that Herring's formula for the phonon-drag thermopower ${S}^{g}$ is equivalent to the standard Cantrell-Butcher (CB) formula for a two-dimensional electron (or hole) gas. The CB approach provides a rigorous theoretical framework which is remarkably successful in explaining the measured ${S}^{g}$ in two-dimensi…
This work for the first time reports X-ray crystals of the two mononuclear mercury(II) porphyrin complexes, i.e., a four-coordinate complex Hg(p-CN)4tpp (1) and a five-coordinate complex Hg(N-Me-tpp)Cl (2). Compound 1 is distorted square planar, whereas compound 2 is trigonal bipyramidal distorted square-based pyramid…
The improvements in the characterization of II--VI-compound-based solar cells and the recent experimental characterization of small clusters and nanoparticles make the study of small II--VI clusters very interesting. In this work, the ground states of small ${\mathrm{Zn}}_{i}{X}_{i}$ clusters are studied, $X=\mathrm{S…