Materials Literature
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The engineering versatility of molecular organic materials, together with their attractive electronic, magnetic, and optical properties, have triggered their preparation as thin films in the last years. Although the interactions between molecules and inorganic substrates are rather weak (van der Waals, hydrogen bondin…
The mass spectra of trimethylsilyl (TMS) derivatives of possible hydroxylated pyrolysis products of glucose and cellulose were recorded by gas chromatography/mass spectrometry (GC/MS) analyses of TMS derivatives of 2-hydroxymethylfuran, 2-hydroxy-1-methyl-1-cyclopenten-3-one, 5-(hydroxymethyl)-2-furaldehyde, 5-methyl-…
We analyse the effect of the applied field (Happl) on the current-driven magnetization reversal in pillar-shaped Co/Cu/Co trilayers, where we observe two different types of transition between the parallel (P) and antiparallel (AP) magnetic configurations of the Co layers. If Happl is weaker than a rather small thresho…
The anomalous Hall coefficient Rs has been studied for the reentrant spin glass system Fe0.7Al0.3 by measuring the magnetization M and the Hall resistivity r_H. We have found that R_s exhibits anomalous temperature dependence at the spin-glass transition temperature T_G, indicating that an additional term appears alon…
We investigate the vortex state in a two-band superconductor with strong intraband and weak interband electronic scattering rates. Coupled Usadel equations are solved numerically and the distributions of the pair potentials and local densities of states are calculated for two bands at different values of magnetic fiel…
Neutron diffraction studies have been carried out in the applied magnetic field H(//[011]) on a single crystal of pyrochlore ferromagnet Nd2Mo2O7, whose Hall resistivity(r_H) has been reported to have quite unusual magnetic field (H)- and temperature (T)- dependences. The intensities of the observed magnetic reflectio…
The nonequilibrium dynamical behaviour that arises when two ordered two-dimensional monolayers of particles are sheared over each other is studied in Brownian dynamics simulations. A curious sequence of nonequilibrium states is observed as the driving rate is increased, the most striking of which is a sliding state wi…
The structure of the ${\mathrm{Al}}_{70}{\mathrm{Pd}}_{21}{\mathrm{Mn}}_{9}$ surface has been investigated using high-resolution scanning tunneling microscopy. From two large fivefold terraces on the surface in a short decorated Fibonacci sequence, atomically resolved surface images have been obtained. One of these te…
Nanocrystalline Ni 0.35 Zn 0.65 Fe 2 O 4 mixed ferrite was obtained from the Fe 2 (Ni 0.35 ,Zn 0.65 )(OH) 4 (C 2 H 2 O 4 ) 2 ⋅H 2 O complex combination that corresponds to the atomic ratio Ni(II) : Zn(II) : Fe(III) = 0.35 : 0.65 : 2; the complex combination was decomposed at 325°C and the resulting oxides mixture was…
Thin single-crystal tellurium nanobelts and nanotubes have been created by the hydrothermal disproportionation of Na2TeO3 in aqueous ammonia solution, without the presence of any catalysts or templates. It appears that tellurium nanobelts with a helical pitch can be coaxed into chiral nanotubes under these conditions,…
Using the full-potential screened Korringa-Kohn-Rostoker method we study the full-Heusler alloys based on Co, Fe, Rh, and Ru. We show that many of these compounds show a half-metallic behavior; however, in contrast to the half-Heusler alloys the energy gap in the minority band is extremely small due to states localize…
The perovskite‐structured SrSnO 3 possessing steady capacitance over the temperature range between 27°C and 300°C in a frequency domain spanning nearly four decades has been evaluated. The samples investigated in this study were synthesized by using solid‐state reaction (SSR) and self‐heat‐sustained (SHS) techniques.…
We have numerically investigated a reaction-diffusion model for the hydration of calciumsulphate (gypsum). The simulations were conducted for two and three dimensional systems. While the dissolution of anhydrous gypsum is considered irreversible at a finite rate the precipitation/dissolution reaction for the calciumdi…
The present paper describes a computational study of the short contact time catalytic partial oxidation of methane in fixed-bed reactors employing a rhodium-based catalyst. A monodimensional model was developed, and its validation was carried out on the basis of two experimental sets of literature data. Transport phen…
The chemical vapor deposition of zinc oxide thin films can be carried out with diethyl zinc and water vapor. The present study uses molecular orbital methods to examine complexes of one and two molecules of H 2 O with Zn(C 2 H 5 ) 2, and the subsequent hydrolysis, elimination, and oligomerization reactions which may o…
Subnanoscale windows (nanowindows) were donated to the walls of single-wall carbon nanohorns (SWNHs) by oxidation in oxygen at different temperatures of 573−693 K. We determined the accessibility of internal nanospaces of the SWNHs through nanowindows to He, Ar, N 2, CH 4, SF 6, and C 60 . An explicit molecular sievin…
Hybrid silicate materials derived from organo-bridged silsesquioxane precursors, RO3-Si-R'-Si-OR3, where R and R' are organic ligands, represent a remarkably diverse class of nanocomposites capable of forming both Si-O-Si and Si-C-Si bonds with molecular scale homogeneity. Recently, in an effort to better control thei…
WO 3 and TiO 2 colloids were synthesized by the forced hydrolysis technique, and different amounts of the TiO 2 colloids were added to WO 3 colloids under sonication to get stable combined TiO 2 and WO 3 colloids (WO 3 /TiO 2 ). The experimental results indicate that the UV-light coloration of WO 3 colloids can be imp…
The concept of aromaticity was first invented to account for the unusual stability of planar organic molecules with 4n + 2 delocalized pi electrons. Recent photoelectron spectroscopy experiments on all-metal MAl(4)(-) systems with an approximate square planar Al(4)(2-) unit and an alkali metal led to the suggestion th…
A direct and simple one-step route has been demonstrated to control the organization of semiconductor Ag 2 S nanocrystals. Several superstructures including hexagonal, quasi-orthogonal, and chain-like arrays assembled from Ag 2 S nanoparticles, and quasi-orthogonal and hexagonal structures assembled from Ag 2 S nanoro…