Materials Literature
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Electrical transport and optical properties were investigated in porous thin films consisting of ${\mathrm{In}}_{2}{\mathrm{O}}_{3}:\mathrm{Sn}$ (indium tin oxide, ITO) nanoparticles with an initial crystallite size of $\ensuremath{\sim}16 \mathrm{nm}$ and a narrow size distribution. Temperature dependent resistivity…
We studied the electrical conductivity of DNA samples as function of the number of DNA molecules. We showed that the insulating gap (no current at low voltage) increases from ~1-2 V for bundles and large ropes to ~4-7 V for few DNA molecules. From the distance dependent variation of the current, a unique hopping dista…
The electronic and optical properties of the cleavage InAs(110) surface are studied using a semi-empirical tight-binding method which employs an extended atomic-like basis set. We describe and discuss the electronic character of the surface electronic states and we compare with other theoretical approaches, and with e…
New efficient mechanism of obtaining spin polarization in_nonmagnetic_ semiconductors at arbitrary temperutures is described. The effect appears during tunneling of electrons from a nonmagnetic semiconductors (S) into ferromagnet (FM) through a Schottky barrier modified with very thin heavily doped interfacial layer.…
The two smallest boron clusters (B 3 and B 4 ) in their neutral and anionic forms were studied by photoelectron spectroscopy and ab initio calculations. Vibrationally resolved photoelectron spectra were observed for B 3 - at three photon energies (355, 266, and 193 nm), and the electron affinity of B 3 was measured to…
We characterize the iron and cobalt catalysts for carbon nanotube growth in chemical vapor deposition (CVD) by using electron microscopy. Nanoparticles of iron and cobalt exhibit a melting point drop in the methane ambient. Nanoparticles after nanotube growth are identified as Fe 3 C and Co 3 C for iron and cobalt, re…
The effect of substituents on the position and intensity of the electronic absorption and fluorescence spectra of phthalocyanines (Pcs) was examined for 35 Pc compounds. When electron-releasing groups are bound to four alpha-benzo positions of the Pc skeleton, the B and Q bands shift to longer wavelength. Relative to…
Abstract Because silica has strong filler–filler interactions, a silica‐filled rubber compound shows a poor filler dispersion compared to a carbon black‐filled one. Improvement of the filler dispersion in silica‐filled styrene–butadiene rubber (SBR) compounds was studied using low molecular weight polybutadiene (liqui…
With the ultimate goal of developing thermal storage materials by means of computer simulation, we attempt to predict a material's melting point and latent heat of fusion, both of which are important properties for evaluating a thermal storage material. Molecular dynamics calculations using the NPT ensemble were perfo…
New carbohydrate-functional siloxanes (CHFS) have successfully been synthesized by acid-catalyzed transacetalation between unprotected methyl gluconyl glycinate (MGG) as a hydrophilic component and an acetal-functional siloxane in DMF/dioxane mixed solvents. MGG, which can be regarded as a hybrid material composed of…
Abstract For Abstract see ChemInform Abstract in Full Text.
We have investigated the role of N 2 in the synthesis of carbon nanotubes (CNTs) by dc hot-filament plasma-enhanced chemical vapor deposition. An NH 3 and C 2 H 2 gas mixture with a ratio of 4:1 was used as a precursor for the synthesis of CNTs on nickel-coated TiN/Si (100) substrates. N 2 gas was introduced at a flow…
The Rayleigh scatterings of fluorine-doped silica glasses as a function of fictive temperature were examined. The scattered intensity of pure silica glass increases proportionally to fictive temperature, implying that density fluctuation increases proportionally to fictive temperature. While the Rayleigh scattering ca…
Germanium (Ge) nanostructures embedded in Al 2 O 3 dielectric are synthesized by the vacuum electron-beam co-evaporation method. A clear blue-shift of the absorption edge and a large third-order nonlinear optical susceptibility are observed due to the quantum confinement effects. Current–voltage and capacitance–voltag…
Abstract A new concept for the calculation of the mobile dislocation density in constitutive models is presented. In contrast to earlier approaches this concept does not use rate equations to calculate the evolution of the mobile dislocation density but is based on the minimization of the flow stress in each increment…
Double-wall carbon nanotubes are the molecular analogues to coaxial cables. Narrow diameter double-walled carbon nanotubes (DWNTs) have been obtained by catalytic chemical vapour deposition process with high yield and characterized by scanning and transmission electron microscopy. We examine the inelastic light scatte…
Abstract Poly(anhydride‐ester)s and poly(anhydride‐amide)s derived from both 4‐ and 5‐aminosalicylate acids (4‐ and 5‐ASA) were synthesized and characterized by physicochemical methods. Thermal and solubility characteristics directly correlated to the polymer backbone composition; polymers based on 5‐ASA had greater s…
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of short-chain amphiphiles, and to lamellar phases of long-chain block copolymers. The corrugated surface is modeled by having a sin…
In the present study poly(isoprene-block-ethylene oxide), PI-b-PEO, block copolymers are used to structure iron oxide and silica precursors into reverse mesophases, which upon dissolution of the organic matrix lead to well-defined nanoparticles of spheres, cylinders, and plates based on the original structure of the m…
Abstract The interaction of lattice dislocations with symmetric and asymmetric tilt grain boundaries has been simulated for different grain boundary misorientation angles by means of the molecular dynamics method using embedded atom method (EAM) potentials. An edge dislocation is equidistantly placed between a grain b…