Materials Literature
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A pentaerythiritol-based metallodendrimer with four ruthenium(II) terpyridine units (RuDen) and a Dawson-type phosphotungstate, P2W18O626- (P2W18) are immobilized on a glassy carbon electrode to form multilayered self-assemblies by layer-by-layer deposition based on electrostatic interaction. The (P2W18|RuDen) multila…
Rare earth oxide dispersions, primarily europium doped yttria (YOX), in the ordered mesoporous material SBA-15 were synthesized by impregnating the calcined host material with different aqueous rare earth nitrate solutions and subsequent calcination. The materials obtained were characterized by N 2 -sorption measureme…
Polythiophene (PT), poly(3-chlorothiophene) (PCT), and poly(3-methylthiophene) (PMeT) have been electrochemically deposited on mirrorlike stainless steel (SS) electrode surfaces by direct oxidative polymerization of corresponding monomers in boron trifluoride diethyl etherate (BFEE) solution. The doping levels of as-g…
We report the synthesis and characterization of a series of luminescent chemosensory materials that have the conjugated polymer poly[ p -(phenyleneethynylene)- alt -(thienyleneethynylene)] (PPETE) as a backbone and oligopyridine pendant sites as receptors. These polymers are soluble in common organic solvents and high…
Electrocatalytic oxidation of methane over anodes in single-chamber solid oxide fuel cells, 0-10 wt % Pd-30 wt % <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:msub> <mml:mi mathvariant="normal">Ce</mml:mi> <mml:mrow> <mml:mn>0.8</mml:mn> </mml:mrow> </mml:ms…
A novel approach to the preparation of polymer nanocomposites utilizing a low-molecular-weight reactive modifying reagent has been developed in this study. This is the first report on the fabrication of in situ nanocomposites using maleic anhydride as a reactive reagent that acts both as a modifying additive for the p…
High purity iron, which transforms into the hcp phase under pressure, has recently been reported to be superconducing in the pressure range 150-300 kBar [shim]. The electronic structure and the electron-phonon coupling ($λ_{ph}$) are calculated for hcp iron at different volumes. A parameter-free theory for calculating…
Perpendicularly orientated ZnO rods have been grown on thin ZnO templates, from aqueous solutions of zinc acetate and hexamethylenetetraamine (HMT); growth along the c-axis of the ZnO crystallites is promoted by the presence of acetate in the bath.
We review recent development in Raman techniques and diamond anvil cell technology, that allow measurements of Raman of metals in the megabar pressure range. The Raman technique includes holographic transmission optics and single-stage spectrographs with CCD array detectors. Use of synthetic high-purity diamonds and a…
We examine the influence of the charge density along a polyelectrolyte chain on the buildup of multilayer films formed by the sequential adsorption of alternating layers of polyanions and polycations (the layer-by-layer technique). Model random copolymers of diallyldimethylammonium chloride (DADMAC) and N -methyl- N -…
High-density amorphous ice (HDA), further densified on isobaric heating from 77 K to 165 (177) K at 1.1 (1.9) GPa, relaxes at 77 K and 1 bar to the same structural “state” with a density of 1.25 ± 0.01 g cm−3. Its density is higher by ≈9% than that of HDA, and thus it is called very-high-density amorphous ice (VHDA).…
The phonon dispersion relations of graphite can be probed over a wide range of the Brillouin zone by double resonance Raman spectroscopy. The double resonance Raman process provides us with new assignments for the dispersive and nondispersive features observed in the Raman spectra of disordered graphite and carbon nan…
X-ray linear dichroism in an α,ω-dibromoalkane/urea inclusion compound and its application to polarization analysis of magnetic diffraction, S P Collins, D Laundy, K D M Harris, B M Kariuki, C L Bauer, S D Brown, P Thompson
In this study the electrical conductivity of a Cu/cupric oxide/Cu sandwich structure was investigated in order to understand the instability in the electrical transportation mechanism of cupric oxide (CuO). In order to obtain the Cu/CuO/Cu sandwich structure, Cu was coated onto the surfaces of a granular and polycryst…
The long-term electrical stability and dielectric breakdown of insulating polymers is largely determined by the density and energy distribution of the conduction and trapping levels. Although these materials are widely used in technical applications very little is known about the nature of the deep trapping centres wh…
Iron chelates derived from ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA), ethylenediaminedi(o-hydroxy-p-methylphenylacetic) acid (EDDHMA), ethylenediaminedi(2-hydroxy-5-sulfophenylacetic) acid (EDDHSA), and ethylenediaminedi(5-carboxy-2-hydroxyphenylacetic) acid (EDDCHA) are remarkably efficient in correcting…
Density-functional ab initio molecular dynamics is used to study the incorporation of nitrogen into carbon networks. The resulting networks were analyzed using a Wannier-function technique for producing a localized orbital picture that provided us with a means of identifying bonding types of the nitrogen and carbon at…
Space charge dynamics in low density polyethylene films were observed by the pulsed electroacoustic (PEA) method throughout breakdown tests at various temperatures. To clarify the relationship between space charge and breakdown, we developed a PEA system with a current measurement unit. The applied voltage was increas…
Constant-pressure Monte Carlo simulations have been performed to study the static and dynamical properties of a liquidlike ordered suspension of like-charged colloidal particles subjected to a sudden compression. We report for the first time a liquidlike ordered monodisperse suspension undergoing a glass transition at…
We have demonstrated the reduction of photon-number fluctuations below the shot-noise level (photon-number squeezing) by two-photon absorption in an inorganic semiconductor material consisting of a thin film of TOPO-decorated CdSe nanocrystals embedded in a PMMA polymer host. The photon-number squeezing was measured a…