Materials Literature
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A family of binary oxide compositions, including titania−zirconia, titania−alumina, alumina−zirconia, zirconia−silica, and alumina−silica, with a hierarchically bimodal mesoporous−macroporous structure has been prepared. The macropores are in one-dimensional orientation, parallel with each other, and the macroporous f…
A catalyst of copper oxide supported on cerium oxide has been characterized by XRD, Raman, XAFS, XPS, and EPR techniques. Its redox properties under CO/O 2 have been explored with XPS and EPR. The results reveal the presence of mainly CuO-related species highly dispersed over the nanosized ceria support and essentiall…
Cryptocrystal layers of ammonium silicon fluoride (NH4)2SiF6 were grown on silicon wafers by dry etching using the vapors of HF:HNO3 solution at room temperature. As-grown layers are composed of white granular crystalline film with thicknesses of up to 8 micrometer which were synthesized with growth rates of around 1…
Ge x P x S 1−2 x glasses in the compositional range have been synthesized and examined in temperature modulated differential scanning calorimetry (MDSC) and Raman scattering experiments. Trends in the non-reversing enthalpy Δ H nr ( x ) near T g show the term to almost vanish in the 0.090(5)< x <0.135(5) range, and to…
We propose a novel approach to model amorphous materials using a first principles density functional method while simultaneously enforcing agreement with selected experimental data. We illustrate our method with applications to amorphous silicon and glassy GeSe 2 . The structural, vibrational and electronic properties…
X-ray and neutron powder diffraction data as a function of temperature are analyzed for the colossal dielectric constant material CaCu3Ti4O12. The local structure is studied using atomic pair distribution function analysis. No evidence is found for enhanced oxygen displacement parameters suggesting that short-range oc…
Dimensionality is known to play a key role in the solution behavior of nano- and mesoparticles. In particular, the shape and the range of the attractive van der Waals interparticle potential are determined by the number of microscopic versus mesoscopic dimensions. For single-walled nanotubes (SWNTs), where two of the…
A variety of redispersible Eu(3+)-doped LaPO(4) nanoparticles have been prepared in a high-boiling coordinating solvent mixture, and the Eu(3+) lattice sites of these materials have been investigated by luminescence line-narrowing measurements. In this spectroscopic method, Eu(3+) ions occupying different lattice site…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward Systematic Understanding of Diversity of Electronic Properties in Low-Dimensional Molecular SolidsHitoshi Seo, Chisa Hotta, and Hidetoshi FukuyamaView Author Information Correlated Electron Research Center (CERC), AIST Tsukuba Central 4, Ibaraki 305-8562, Japan Depart…
We present a non-mechanical, dynamically programmable, all-optical image rotator, which can rotate an input image to any angle or a grid given by 360°/2<sup>n</sup>, where n is the number of stages. The image rotator uses cascaded stages in which each stage rotates the image by an angle given by half the previous…
We report a photoemission study of the systematics of the $4f$ electronic structure of a family of rare-earth organic compounds. Resonant photoemission has been used to determine the binding energies of the $4{f}^{N\ensuremath{-}1}$ ground states, relative to those of the ligand orbitals, of a number of rare-earth tri…
ZnO thin film is the perspective material for using as active layer in solid-state UV photodetectors. Here we present our investigations of photoelectric properties of the developed photosensitive field-effect transistor. Pure and lithium doped ZnO films were produced by vacuum electron-beam deposition method. Field e…
Abstract A polydisilahydrocarbon, namely, poly(tetramethyldisilylene‐ co ‐styrene), synthesized from dimethyldichlorosilane and styrene in 1 : 0.5 mol ratio under dechlorination conditions was evaluated as an atomic oxygen (AO) resistant coating for polyimide film and C‐polyimide composite. Exposure of the polymer coa…
Abstract Copolymers were synthesized through the chemically oxidative polymerization of N ‐ethylaniline (EA) and aniline (AN) in five acid aqueous media. The polymerization yield, intrinsic viscosity, molecular weight, solubility, solvatochromism, electrical conductivity, and mechanical properties of the copolymer fil…
In recent years, lead has been recognized as a source of environmental pollution; this includes lead use for radiation shielding in radiotherapy. We looked for a new material that could be a lead substitute. We chose a material composed of tungsten and resin. We compared the attenuation coefficient of the material wit…
Piperidinium 9H-fluorene-9-carbodithioate and its 2,7-di-tert-butyl-substituted analogue [(pipH)(S(2)CCH(C(12)H(6)R(2)-2,7)), R = H (1a), t-Bu (1b)] and 2,7-bis(octyloxy)-9H-fluorene-9-carbodithioic acid [HS(2)CCH(C(12)H(6)(OC(8)H(17))(2)-2,7), 2] and its tautomer [2,7-bis(octyloxy)fluoren-9-ylidene]methanedithiol [(H…
The displacement of $\mathrm{C}{\mathrm{O}}_{2}$ by Xe on single-walled nanotube bundles is investigated with Fourier transform infrared spectroscopy (FTIR) and grand canonical Monte Carlo (GCMC) simulations. The FTIR experiments show that $\mathrm{C}{\mathrm{O}}_{2}$ physisorption at $77\phantom{\rule{0.3em}{0ex}}\ma…
A series of bimetallic Al2O3-supported Rh-Ge catalysts was prepared by surface redox reactions under controlled hydrogen atmosphere. The surface properties of these catalysts were probed via in-situ FTIR spectroscopic studies of adsorbed CO and were compared to those of monometallic Rh catalysts that had undergone sim…
Abstract Silicon‐containing polyimides were synthesized by solution polycondensation of bis(3,4‐dicarboxyphenyl)dimethylsilane dianhydride with 3,4‐oxydianiline and 4,4′‐oxydianiline, respectively. All the poly(amic acid) films could be obtained by solution‐casting from N,N ‐dimethylacetamide solutions and thermally c…
Abstract A new type of urethane segmented copolymer was prepared from hydroxyl‐terminated trans ‐polyisoprene (HTTPI) and toluene diisocyanate (TDI). The structures of the copolymer were characterized by FTIR and GPC. Crystalline properties of trans ‐polyisoprene (TPI) segments were investigated using WAXD and DSC tec…