Materials Literature
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The locally self-consistent real space multiple scattering technique has been applied to calculate the electronic structure and chemical binding for the c(2x2)O/Cu(001) system, as a function of $d_{O-Cu1}$ -- the height of oxygen above the fourfold hollow sites. It is found that the chemical binding between oxygen and…
The effects of adsorbates on nucleation and growth of two-dimensional islands is investigated by kinetic Monte Carlo simulations and rate equation theory. The variation of island morphology with adsorbate parameters is discussed and the temperature-dependence of island density in the case of immobile adsorbates is stu…
The relaxation dynamics of photoexcited CdSe nanoparticles (NPs) were studied with femtosecond pump−probe spectroscopy in the spectral range from 450 nm to 5 μm. Thus, the intraband relaxation of the electron and the hole were monitored with femtosecond time resolution. The transition from delocalized electronic to lo…
A Landau-Ginsburg-Devonshire-type nonlinear phenomenological theory is presented, which enables the thermodynamic description of dense laminar polydomain states in epitaxial ferroelectric thin films. The theory explicitly takes into account the mechanical substrate effect on the polarizations and lattice strains in di…
We investigate numerically the spectrum of plasmon resonances for metallic nanowires with a nonregular cross section, in the $20--50 \mathrm{nm}$ range. We first consider the resonance spectra corresponding to nanowires whose cross sections form different simplexes. The number of resonances strongly increases when the…
By use of in situ atomic force microscopy, polyelectrolyte multilayers were shown to swell on exposure to solutions containing salt. The quasilinear swelling response, used to estimate swelling coefficients and equilibria, exhibits orders of magnitude of difference, depending on the pair of polyelectrolytes constituti…
Abstract The effect of alkyl groups on the polycondensation of aromatic diamines and quinones to form poly(quinone imine)s was investigated. Models were synthesized under standard conditions: 1 equiv of quinone was reacted with 2 equiv of aniline in the presence of titanium tetrachloride and 1,4‐diazabicyclo[2.2.2]oct…
Poly(aniline- co - o -anthranilic acid) (PAAA) and photosensitive diazoresin (DR) in aqueous solution were self-assembled into multilayer ultrathin film through electrostatic interaction. Under UV irradiation, following the decomposition of the diazonium group between bilayers, the ionic bond of the self-assembly film…
Abstract Three series of poly(ethylene glycol)methyl ether (MPEG)/poly(lactic acid) (PLA) block copolymer systems, composed of MPEG in the molecular weights of 2000, 5000, and 750 g/gmol, respectively, and PLA in different molecular weights were synthesized. The chemical structure and physical properties were investig…
Abstract Free‐radical–initiated copolymerization of N ‐phenylmaleimide (NPMI) with styrene (St) at 110°C in a toluene solution initiated by AIBN was carried out by a semibatch method. The compositions of the copolymers were determined by using an elemental analyzer. The glass‐transition temperatures of the copolymers…
The novel polythiophosphate anion [P2S10]4- adopts two different conformations in the structure of Cs4P2S10; these consist of two PS4 tetrahedra connected via a disulfide, giving rise to a S42- fragment. Cs4P2S10 has been characterized by single-crystal X-ray diffraction, differential thermal analysis, Raman, optical…
A range of monolithic silicas and aluminosilicates with disordered crystalline-like pore structures and high surface areas have been synthesised based on a direct crystal templating approach to surfactant-assisted sol–gel synthesis of porous materials. Commercially available oxyethylated non-ionic surfactants, includi…
Lanthanum gallate thin films were deposited by atomic layer epitaxy (ALE) at 325–425 °C from β-diketonate-type precursors, La(thd)3 and Ga(acac)3, and ozone. Films were grown on soda lime glass, Si(100), MgO-buffered Si(100), sapphire, MgO(100), SrTiO3(100) and LaAlO3(100) substrates. Good control of film stoichiometr…
The modelling of the local structure of sol–gel derived Eu3+-based organic/inorganic hybrids is reported, based on Small-Angle X-ray Scattering (SAXS), photoluminescence and mid-infrared spectroscopy. The hybrid matrix of these organically modified silicates, classed as di-ureasils and termed U(2000) and U(600), is fo…
The preparation and physical characterization are reported for the single-molecule magnet salts [M(Cp')(2)](n)()[Mn(12)O(12)(O(2)CC(6)F(5))(16)(H(2)O)(4)] (M = Fe, n = 1, Cp' = C(5)Me(5) (2a), C(5)H(5) (2b); M = Co, n = 1, Cp' = C(5)Me(5) (2c), C(5)H(5) (2d); M = Fe, n = 2, Cp' = C(5)Me(5) (2e), C(5)H(5) (2f)) to inve…
In recent years, a second fluid-fluid phase transition has been reported in several materials at pressures far above the usual liquid-gas phase transition. In this paper, we introduce a model of this behavior based on the Lennard-Jones interaction with a modification to mimic the different kinds of short-range orienta…
We have used a variety of experimental techniques, including high-resolution transmission electron microscopy, X-ray diffraction, and adsorptive decomposition of N 2 O to examine the characteristics of copper particles dispersed on different types of graphite nanofiber supports. When copper was dispersed on the edge s…
The non-emissive platinum(II)-quaterpyridine complex shows strong photoluminescence at room temperature upon incorporation into Nafion membrane; this complex is stabilized toward photochemical decomposition in Nafion even in the presence of oxygen, and can be used as a sensitizer to generate singlet oxygen to oxidize…
Abstract Results from the grafting of poly(acrylic acid) (PAA) onto cellulosic microfibers and continuous cellulose filaments are presented. The grafting of PAA onto cellulosic fibers offers the possibility of developing enhanced ion exchange and fluid absorbency on the fibers. The grafting of PAA was carried out with…
A series of Cu/SiO 2 catalysts with various alkali metal oxide additives was investigated to elucidate the effects of additives on the catalytic properties of copper catalysts in the dehydrogenation of ethanol. The catalysts were prepared by the impregnation method and were characterized by X-ray diffraction, temperat…