Materials Literature
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Alkanethiol self-assembled monolayers (SAMs) on gold exhibit a series of sharp resonances in their surface-enhanced Raman spectrum that depend dramatically on carbon chain length. This unusual behavior suggests a coupling of the gold-sulfur bond stretch with the longitudinal acoustic, "accordion", vibrations of the mo…
Bulk metallic gold particles ( approximately 1000 nm) catalyze the reaction of CO, O2, and primary amines (R-NH2) to give ureas (RNH)2C=O. Isocyanates (R-N=C=O) are identified as intermediates in the reactions and are shown to react with primary and secondary amines to give ureas under the conditions of the gold-catal…
A series of supermolecular liquid crystals has been synthesized by combining a cyclotriphosphazene unit as a dendritic core and polycatenar mesogenic units. Microsegregation of the alkyl chains and the aromatic central cores together with space-filling properties make these cyclophosphazenes adopt a discotic conformat…
CoPt and FePt nanowire arrays were successfully prepared by electrodeposition into nanochannels of porous alumina membranes. The as-deposited CoPt alloy has a face centred cubic structure and displays soft magnetic properties. Heat treatment at 700 °C for different durations, under vacuum condition was carried out in…
A hollow victory: Hollow capsules of poly(methyl methacrylate) (PMMA) stereocomplex can be fabricated by a combination of the layer-by-layer assembly technique and the silica template method (see scheme; it=isotactic, st=syndiotactic). A hollow nanostructure composed of nonionic multilayers is constructed through van…
Nanoshells are a novel class of optically tunable nanoparticles that consist of alternating dielectric and metal layers. They can potentially be used as contrast agents for multi-label molecular imaging, provided that the shell thicknesses are tuned to specific ratios. Sub-100 nm multi-layer nanoshells can potentially…
A terthiophene fused with bicyclo[2.2.2]octene units only at both ends was newly synthesized. Since there is no steric hindrance at the central position, this terthiophene has a possibility to interact only at the central position. One-electron oxidation of this terthiophene afforded a highly stable radical-cation sal…
Oxygen-isotope-exchange rates were measured between sites in the Lindqvist-type [H(x)()Nb(6)O(19)](8)(-)(x)()((aq)) polyoxoanion and aqueous solution as a function of pH and temperature. The ion has a central mu(6)-O that is inert to exchange, 12 mu(2)-O(H), and 6 eta-O. The potassium salt of this ion is recrystallize…
Abstract Novel biobased epoxy resins were prepared from two fatty acid derivatives; epoxidized 10‐undecenoyl triglyceride and epoxidized methyl 3,4,5‐tris(10‐undecenoyloxy)benzoate, with 4,4′‐diaminodiphenylmethane as a crosslinking agent. The flame retardancy of these epoxy resins was improved by the addition of 10‐[…
SnO 2 nanocrystalline thin films were deposited on glass substrates by the spray pyrolysis technique in air atmosphere at 375, 400, 425, 450 and 500 °C substrate temperatures. The obtained films were characterized by using XRD. The room temperature photoluminescence (PL) spectra of these films have near band edge (NBE…
Electronic spectrum of organoimide derivatives of hexamolybdates have first been calculated within the time-dependent density-functional theory in conjunction with Van Leeuwen-Baerends (LB94) exchange correlation potential, statistical average of orbital potentials (SAOP), and gradient-regulated connection potential (…
The kinetics of enzymatic ring-opening polymerization (eROP) of ε-caprolactone in supercritical carbon dioxide (scCO 2 ) was investigated using a new, high-pressure sampling autoclave. The polymerization was performed using Candida antarctica lipase B (CALB) as catalyst and was found to be approximately first order wi…
In this paper, we evaluate the strength, toughness and stiffness of super-nanotubes, just recently discovered, and of the related fibre-reinforced composites. The prediction of huge toughening mechanisms suggests the feasibility of ‘super-composites'. We found the optimum for super-nanotubes with a number of ∼2 hierar…
Selective-controlled structure and shape of LaVO(4) nanocrystals were successfully synthesized by a simple hydrothermal method without the presence of catalysts or templates. It was found that tuning the pH of the growth solution was a crucial step for the control of the structure transformation, that is, from monocli…
We have undertaken a new study of the magnetic and crystalline structures of YMnO 3 and HoMnO 3 using neutron diffraction combined with neutron polarimetry. It is shown how the long-standing problem of distinguishing between magnetic structure models which give nearly identical diffraction intensities may be resolved.…
The attachment of a hydrophobic peptide onto polybutadiene-block-poly(ethylene oxide) shifts the assembly morphologies in water towards those with lower curvatures, namely, from spherical micelles to wormlike micelles and vesicles (see picture; wEO: weight fraction of the hydrophilic PEO block; PEO=poly(ethylene oxide…
Interfacial charge-transfer absorption (IFCTA) provides information concerning the barriers to charge transfer between molecules and the energy levels of a metal/semiconductor and the magnitude of the electronic coupling and could thus provide a powerful tool for understanding interfacial charge-transfer kinetics. Her…
Models to account for the observed experimental results for low-energy nuclear reactions in palladium-deuteride systems are presented along with calculated results. The crucial idea is a mechanism of improved probability for the needed penetration of the Coulomb barrier for a D-D reaction. This facilitation occurs, in…
Density functional and quantum Monte Carlo calculations challenge the existence of a unique ground state structure for certain Si clusters. For Si clusters with more than a dozen atoms the lowest ten isomers are close in energy and for some clusters entropic effects can change the energetic ordering of the configurati…
We report on the study of spin photocurrents in (110)-grown quantum well structures. Investigated effects comprise the circular photogalvanic effect and so far not observed circular photon drag effect. The experimental data can be described by an analytical expression derived from a phenomenological theory. A microsco…