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。
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCobalt on Mesoporous Silica: The First Heterogeneous Pauson−Khand CatalystSang-Wook Kim, Seung Uk Son, Sang Ick Lee, Taeghwan Hyeon, and Young Keun ChungView Author Information Department of Chemistry and Center for Molecular Catalysis and School of Chemical Engineerin…
Polypyrrole (PPy) may be set to revolutionize biological applications such as tissue engineering and biosensors due to its high electroactivity/conductivity and the water compatibility of its films. However, inherent weaknesses in PPy-based materials arise from defect sites along the PPy polymer backbone, and its inst…
A new class of binary mesoporous yttria–zirconia(YZ) and ternary mesoporous metal-YZ materials (M=electroactive Ni/Pt) is presented here (the Figure shows PtYZ) that displays the highest surface area of any known form of yttria-stabilized zirconia. These mesoporous materials form as solid solutions and retain their st…
The transport and dielectric properties of ${\mathrm{Sr}}_{0.97}({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}){\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ solid solutions have been investigated at temperatures $1.5\mathrm{K}<~T<~300\mathrm{K}$ and frequencies $20\mathrm{Hz}<~\ensuremath{\nu}<~1\…
The crystal structure of silicalite (SiO2) with a substantial amount of structural hydroxyl groups [Si(1-x)O(2-4x)(OH)4x, with 0.08<x<0.10] has been refined from neutron powder diffraction data measured using the HRPD instrument at the ISIS pulsed neutron source. Powder data were collected on the as-synthesized orthor…
We investigate the phase behavior of colloidal hard-rod fluids near a single wall and confined in a slit pore. Zwanzig's hard-rod model is analyzed by minimization of a free energy functional, and a system of freely rotating spherocylinders is studied by Monte Carlo simulations. Both theory and simulation show i) a wa…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(3,4-ethylenedioxypyrrole): Organic Electrochemistry of a Highly Stable Electrochromic PolymerCarleton L. Gaupp, Kyukwan Zong, Philippe Schottland, Barry C. Thompson, Christopher A. Thomas, and John R. ReynoldsView Author Inform…
Lower oxidation potentials than for the monomeric starting materials are displayed by the diporphyrins obtained by one-electron oxidation with tris(4-bromophenyl)ammonium hexachloroantimonate [see, for example, Eq. (1)]. This and the strong red shift observed for the Soret bands of the product are indicative of extens…
We obtain the many-body hydrodynamic friction and mobility matrices describing the motion in a fluid of N hard-spheres with stick boundary conditions in the presence of a planar hard wall or free surface using (1) a multipole expansion of the hydrodynamic force densities induced on the spheres and (2) an image represe…
A new preparation is reported which, for the first time, results in a thin, crystalline SiO 2 film on a Mo(112) single crystal. The procedure consists of repeated cycles of silicon deposition and subsequent oxidation, followed by a final annealing procedure. AES and XPS have been used to control film stoichiometry. LE…
A poly(1,5‐diaminoanthraquinone) [poly(DAAQ)], which is a conducting polymer condensed with 1,4‐benzoquinone, was studied electrochemically and was proposed as a new category of electrochemical capacitor material. In common nonaqueous media, the poly(DAAQ) showed two sets of reproducible redox couples for repeated cyc…
Polyoxotungstates with propyl methacrylate functionalities and ethyl methacrylate were copolymerized in acetonitrile leading to the formation of networks whose swelling properties have been studied in several organic solvents. The polyanions ensure the cross-linking of poly(ethyl methacrylate) chains and are therefore…
Micro-Raman scattering from single-crystal diamond was performed over the temperature range 77--873 K. These measurements show that the Raman phonon frequency and the linewidth are temperature dependent, the linewidth and the frequency extrapolated to 0 K are $1.103\ifmmode\pm\else\textpm\fi{}0.03{\mathrm{cm}}^{\mathr…
We develop a computer simulation for the dynamic behavior of a phase-separating binary mixture that contains mobile, solid particles. The system models “filled polymers”, which contain not only a blend of different macromolecules, but also solid fillers. We focus on the case where one of the components preferentially…
We present the technique of bideposition to realize thin-film helicoidal bianisotropic mediums (TFHBM's) that exhibit high optical activity. We show, by experiment as well as by simulation, that the optical rotation produced by these chiral sculptured thin films is roughly proportional to the square of the local linea…
The crystal structure of La1−xSrxCoO3−δ in the composition range 0≤x≤0.8 was investigated by means of powder XRD. A more detailed study was performed on the x=0.7 composition by neutron diffraction, HRTEM, SAED, image analysis and PEELS. The XRD results indicate a long-range cubic perovskite symmetry (spacegroup Pm3̄m…
Abstract High pressures and temperatures generated during the cavitation process are now considered responsible for the observed physical and chemical transformations using ultrasound irradiation. Effects of various operating parameters reported here include the frequency, the intensity of ultrasound, and the initial…
A complete mechanistic study of the solution dynamics of [Eu(DOTAM)(H 2 O)] 3+ is performed through 1 H and 17 O NMR variable pressure and temperature studies. An unambiguous understanding of the water exchange was possible thanks to the first 17 O NMR observation of the bound water signal on both the M- and m-isomers…
An important new class of materials for optical device applications—polymer-dispersed liquid crystals (PDLCs)—is reviewed. The author gives an overview of these materials along with a description of their fabrication, fundamentally important properties, and current as well as possible future applications. The Figure i…
Metal complexes of pyridine and bipyridine-type ligands represent an important class of nonlinear optical (NLO) materials: (i) They can incorporate a variety of functionalised ligands with a wide range of metals which can give rise to tuneable NLO properties; (ii) they are generally associated with intense low-lying c…