Materials Literature
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Substantial progress has been made recently in extending the supramolecular assembly of biomimetic structures to vesicle-based sophisticated nanocomposites and mesostructures. We report herein the successful preparation of unilamellar surfactant vesicles coated with a monolayer of ring-shaped [Mo(154)] polyoxometalate…
An overview is given of the isotropic and nematic phase behaviour in binary mixtures of hard rods or plates with different lengths or diameters within the framework of the Onsager theory. On the basis of Gaussian trial functions the relative importance of different entropic contributions in the demixing of the isotrop…
The mechanism involved in the Tm3+ (3F4)→Ho3+ (5I7) energy transfer and Tm3+ (3H4, 3H6)→Tm3+ (3F4, 3F4) cross relaxation as a function of the donor and acceptor concentrations was investigated in Tm–Ho-codoped fluorozirconate glasses. The experimental transfer rates were determined for the Tm→Ho energy transfer from t…
The phase behavior of block copolymers melts involving competing length scales, i.e., able to microphase separate on two different length scales, is theoretically investigated using a self-consistent field approach. The specific block copolymers studied consist of a linear A-block linked to an alternating (A- alt -B)-…
The review describes the studies of the magneto-optical properties of II-VI and III-V semiconductor nanocrystals (NCs) capped with organic or inorganic epitaxial shells. The investigations focused on the chemical identification of localization sites (core, shell, or interface) of photogenerated carriers in spherical N…
We present the results of our numerical calculations that focus on the dynamics of a nematic liquid crystal around a spherical particle imposing strong homeotropic anchoring at the surface. The first part of this article is devoted to the discussion of the effect of an external magnetic or electric field on the direct…
Abstract Two methacrylate‐modified clays have been prepared and used to produce nanocomposites of polystyrene and poly(methyl methacrylate) by in situ polymerization. These nanocomposites have been characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), cone…
Abstract A film of poly‐ L ‐lysine (PLL) adheres better to the surface of a glassy carbon electrode when the PLL is partially cross‐linked by means of glutaraldehyde. A film composition of 97.5% PLL/2.5% glutaraldehyde gives good adhesion and retains the anionic exchange capability of the PLL. The performance of the f…
The effect of hydrostatic pressure on crystal field (CF) transitions of Nd-doped ${\mathrm{YVO}}_{4}$ has been studied by luminescence spectroscopy at $T=5\mathrm{K}.$ Specifically, emissions from the ${}^{4}{F}_{3/2}(1)$ and ${}^{4}{F}_{3/2}(2)$ excited levels to the ${}^{4}{I}_{9/2}$ and ${}^{4}{I}_{11/2}$ multiplet…
Low dielectric constant silica based films which incorporate a large amount of nanometer sized pores are attractive candidates as interlayer dielectrics in future gigascale integrated circuits chip technology. Nanoporous silica based films were deposited by surfactant templated self-assembly spin-on deposition (SOD).…
Abstract Chitosan, a natural polymer, bound Schiff base copper complexes CT‐She‐Cu, CT‐ o ‐Bel‐Cu, CT‐ m ‐Bel‐Cu were prepared and characterize by inductively coupled plasma (ICP), FT‐IR and X‐ray photoelectron spectroscopy (XPS). Their catalytic activity in the oxidation of cyclohexene with molecular oxygen was studi…
The role of hydrogen in the growth and material properties of ZnO films grown at temperature as low as 300 °C by plasma-assisted molecular beam epitaxy with and without hydrogen irradiation was investigated. Results showed that during growth, the surface morphology changed from small hemispherical grains (10 nm) to la…
Hollow nanocrystals can be synthesized through a mechanism analogous to the Kirkendall Effect, in which pores form because of the difference in diffusion rates between two components in a diffusion couple. Starting with cobalt nanocrystals, we show that their reaction in solution with oxygen and either sulfur or selen…
Metallic nanoparticles dispersed in a cholesteric liquid crystal can order in accordance with the helical structure of the chiral phase. Since the liquid crystals we used have a glassy state, the nanostructures may be examined by transmission electron microscopy. The platinum nanoparticles form periodic ribbons which…
Using first-principles methods, we study the physicochemical properties such as the binding mechanism and band offset for single-wall zigzag nanotubes on InAs. While the tubes maintain their structural and electronic integrity, binding energies as large as 0.4 eV per site are obtained. Except for semiconducting tubes…
Computer simulations, using the Stillinger-Weber potential, have previously been employed to demonstrate a liquid-liquid transition in supercooled silicon near 1060 K. From calculations of electronic structure using an empirical psuedopotential, we show that silicon undergoes an associated metal to semimetal transitio…
Charge transport at conjugated polymer interfaces with metals and inorganic semiconductors is reviewed. Experiments on the equilibrium properties and DC current-voltage behavior of four specific classes of interfaces-metal-doped conjugated polymer, inorganic semiconductor-doped conjugated polymer, metal-intrinsic conj…
Boron in diamond traps hydrogen forming passive ${\mathrm{B}}_{s}$-H pairs. Boron trapping two deuterium atoms has been speculated as forming a shallow donor (0.23--0.34 eV below the conduction band). We present the results of first-principles calculations of boron complexes with 2--4 hydrogen atoms. The binding energ…
Direct measurements of longitudinal (d33) and transverse (d31) piezoelectric coefficients have been made on cuboid samples of [001]C-poled 0.955Pb[Zn1/3Nb2/3]O3-0.045PbTiO3 (PZN-4.5PT) and 0.68Pb[Mg1/3Nb2/3]O3-0.32PbTiO3 (PMN-32PT) single crystals. The measurements were made in a Berlincourt-type press over a wide ran…
Co doped rutile thin films were fabricated on α-Al2O3 (10-12) substrates by laser molecular beam epitaxy. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy indicated that the rutile thin films are (101) oriented and have smooth surfaces with no impurity phases. Co K-edge x-ray absor…