Materials Literature
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An indented nanostructure was formed on the surface of azobenzene-functionalized polyurethane thin films by the induced migration of polymer chains using the optical near field generated around polystyrene (PS) spheres. The PS spheres, which had a diameter ranging from 98 to 990 nm, were arranged on the surface of a p…
The oxidation reactions of all of the lanthanide cations (except Pm + ) with N 2 O and O 2 have been investigated using the inductively coupled plasma selected-ion flow tube (ICP/SIFT) technique. Lanthanide cations were generated in an inductively coupled plasma (ICP) ion source. Observations are reported for the reac…
Keggin heteropolyanions [XM(12)O(40)](n-) have various isomeric structures, alpha and beta being the most common. Conventionally, the alpha structure appears to be the most stable, but calculations carried out at the DFT level for X = P(V), Si(IV), Al(III), As(V), Ge(IV), and Ga(III) and M = W(VI) and Mo(VI) show that…
We calculated the Madelung energies of both the ground state and excited states in tetrathiafulvalene - p-chloranil (TTF-CA) by taking into account intramolecular charge distribution. The distribution is found to be significant in the neutral-ionic (NI) transition. In the ionic phase, the Madelung energy depends more…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTGas-Phase Catalytic Oxidation of CO by Au2-Hannu Häkkinen and Uzi LandmanView Author Information School of Physics Georgia Institute of Technology Atlanta, Georgia 30332-0430 Cite this: J. Am. Chem. Soc. 2001, 123, 39, 9704–9705Publication Date (Web):September 7, 2001P…
Synchrotron-based high-resolution photoemission, X-ray absorption near-edge spectroscopy, and first-principles density functional (DF) slab calculations were used to study the interaction of NO(2) with a TiO(2)(110) single crystal and powders of titania. The main product of the adsorption of NO(2) on TiO(2)(110) is su…
The transition between four- and six-coordinate structures in CdSe nanocrystals displays simple transition kinetics as compared with the extended solid, and we determined activation volumes from the pressure dependence of the relaxation times. Our measurements indicate that the transformation takes place by a nucleati…
We propose a heuristic explanation for the numerous non-close-packed crystal structures observed in various colloidal systems. By developing an analogy between soap froths and the soft coronas of fuzzy colloids, we provide a geometrical interpretation of the free energy of soft spheres. Within this picture, we show th…
The synthetic routes and materials properties of polypropylene/montmorillonite nanocomposites are reviewed. The nanocomposite formation is achieved in two ways: either by using functionalized polypropylenes and common organo-montmorillonites, or by using neat/unmodified polypropylene and a semi-fluorinated organic mod…
The influence of modifications at the benzylidene protection group on the gelation ability of 1-O-methyl-4,6-O-benzylidene-monosaccharides was investigated. For α-D-glucose and α-D-mannose the ability for self-aggregation was found to be significantly extended by the introduction of a p-nitro-substituent. As a result,…
Equilibrium solubility, the profile and the rate of ibuprofen dissolution in solutions of sodium dodecyl sulfate, Tween 60 and Brij 35 were studied. It was found that the solubility of ibuprofen was enhanced by the formed micellar system. The size and shape of formed micelles depended on the used particular surfactant…
Infrared reflection-absorption spectra of ${\mathrm{TiO}}_{2}$ thin films deposited by plasma-enhanced chemical vapor deposition onto aluminum and by a sol-gel process onto platinum were obtained using s- and p-polarized light and oblique incidence angles. Prominent bands with variable reflection minima position and l…
Surface Brillouin scattering technique has been used to study the elastic properties of superhard amorphous carbon, synthesized from ${\mathrm{C}}_{60}$ under high pressure (13--13.5 GPa) and temperature $(900\ifmmode\pm\else\textpm\fi{}100\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}).$ This is the first reliable det…
“Aerosol catalysis” is shown to be a powerful tool for investigating the catalytic properties of freshly formed nanoparticles in situ and without substrate interference. The method is first outlined conceptually, followed by an illustrative application to the catalytic formation of methane on a nickel nanoaerosol. Rea…
Polarized absorption and emission spectra of trigonal single crystals of an Er(III) complex coordinated to a heptadentate tripodal ligand are reported at temperatures between 8 and 298 K. The assigned energy levels below the onset of ligand absorption (< 25 000 cm(-1)) are fitted to a parametrized electronic Hamiltoni…
Multicomponent arrays based on a central iridium(III) bis-terpyridine complex (Ir) used as assembling metal and free-base, zinc(II) or gold(III) tetraaryl-porphyrins (PH(2), PZn, PAu) have been designed to generate intramolecular photoinduced charge separation. The rigid dyads PH(2)-Ir, PZn-Ir, PAu-Ir, and the rigid a…
Fluorescence “blinking” kinetics of isolated colloidal InP quantum dots (QDs) are investigated via confocal single molecule microscopy. Analysis of fluorescence trajectories reveals inverse power law behavior (∝ 1/τ m ) in on/off time probability densities with m on ≈ 2.0(2) and m off ≈ 1.5(1). Such an inverse power l…
Valence-band dispersions in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ along the $\ensuremath{\Gamma}\ensuremath{-}\ensuremath{\Delta}\ensuremath{-}X$ line $(k\ensuremath{\Vert}[001])$ are obtained by angle-resolved photoemission spectroscopy. Compared with the spectra of GaAs, a small energy shift…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSol−Gel Derived Nitric-Oxide Releasing Materials that Reduce Bacterial AdhesionBrian J. Nablo, Ta-Yung Chen, and Mark H. SchoenfischView Author Information Department of Chemistry University of North Carolina Chapel Hill, North Carolina 27599-3290 Cite this: J. Am. Che…
A phenomenological coupled exciton model is proposed in order to characterize optical excitations in extended dendrimers. An onsite exciton state is assigned at each phenyl rings and a nearest neighbor hopping integral which obeys the Gaussian distribution is considered between the exciton states. The decreasing optic…