Materials Literature
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Photodetachment microscopy of the negative ions Si - and F - has made it possible to measure the electron affinities of silicon and fluorine with improved accuracy. The new recommended electron affinities of 28 Si and 19 F are 11 207.252(18) and 27 432.446(19) cm -1 , i.e. 1.389 5220(24) and 3.401 1895(25) eV, respect…
The observed temperature dependence of electrical conduction in polymer electrolytes is usually fitted with two separated equations: an Arrhenius equation at low temperatures and Vogel-Tamman-Fulcher (VTF) at high temperatures. We report here a derivation of a single equation to explain the variation of electrical con…
We report the magnetic susceptibility, specific heat and dielectric constant on high purity polycrystalline samples of three hexagonal manganites: YMnO_3, LuMnO_3 and ScMnO_3. These materials can exhibit a ferroelectric transition at very high temperatures (T_{FE} > 700K). At lower temperatures there is magnetic order…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLangmuir−Blodgett Nanorod AssemblyFranklin Kim, Serena Kwan, Jennifer Akana, and Peidong YangView Author Information Department of Chemistry, University of California Berkeley, California 94720 Cite this: J. Am. Chem. Soc. 2001, 123, 18, 4360–4361Publication Date (Web)…
We present the results of soft x-ray emission measurements for undoped and protonated polyemeraldine. We show that the polaron-lattice band structure fully accounts for the observed x-ray transitions. A finite spectral intensity of C Kα and N Kα XES is observed at the Fermi level for protonated polyemeraldine, support…
Holographic studies in azobenzene side-chain polymers reveal light-induced periodic surface reliefs at temperatures far below the glass transition temperature. We performed experiments with two-color holography on an azobenzene polymer. An intensive and linear polarized homogeneous blue pump beam illuminated the sampl…
We present details of an experimental study of crystallization adjacent to a cooled boundary from an aqueous solution of potassium nitrate and sodium nitrate. This transparent system is typical of many ternary melts that do not form solid solutions, including examples in igneous petrology and metallurgy. We have measu…
We reexamine the double exchange (DE) theory of the canted spin arrangement in three-dimensional perovskite manganites ${R}_{1\ensuremath{-}x}{D}_{x}{\mathrm{MnO}}_{3}$ (R=trivalent rare-earth ion, D=divalent ion). Our approach is based on the multiple-scattering theory, takes into account the twofold degeneracy of th…
A simple model is proposed to calculate the resistivity, magnetoresistance, and noise spectrum in nonmetallic phase-separated manganites containing small metallic droplets (magnetic polarons). The system is taken to be far from the percolation transition into a metallic state. It is assumed that the charge transfer oc…
Six molecular complexes formed between 4-hydroxy-4‘-nitrobiphenyl/stilbene and a 4-substituted pyridine-1-oxide [methyl ( 1, 2 ), cyano ( 3, 4 ), and nitro ( 5, 6 )] have been studied with the specific aim of assessing a new design strategy for the molecular complexation of new materials that show quadratic nonlinear…
In this study, axisymmetric drop shape analysis-profile (ADSA-P) and atomic force microscopy (AFM) were employed to study the surface features of polypropylene (PP) and hydrosilylated polypropylene (SPP). Static and dynamic contact angles were measured using ADSA-P. Water permeability was calculated from the results o…
We investigate aggregation properties of a liquid crystalline colloid formed by dispersing small PMMA particles in thermotropic nematic liquid crystal 5CB. Upon cooling a low-concentration homogeneous mixture below the clearing point of the nematic phase, polymeric particles aggregate into cellular structures, causing…
The dissolution kinetics of β-tricalcium phosphate (β-TCP) was investigated at 37 °C using the constant composition (CC) method over a range of undersaturation. The rates decreased markedly with time despite the sustained driving force and eventually approached zero, indicating a critical condition in the dissolution…
A new series of photocatalysts, Bi 2 MNbO 7 (M = Al 3+, Ga 3+, In 3+ ), were synthesized by solid-state reaction and characterized by powder X-ray diffraction and Rietveld structure refinement. The substitution effect of In 3+ by Al 3+ and Ga 3+ on the photocatalytic and structural properties of the Bi 2 InNbO 7 photo…
Light illumination produces major, interesting changes of the electrical properties of oxygen deficient ${\mathrm{La}}_{2/3}{\mathrm{Sr}}_{1/3}{\mathrm{MnO}}_{3\ensuremath{-}\ensuremath{\delta}}$ thin films. At small oxygen deficiency, the classical insulator-metal $(I\ensuremath{-}M)$ transition at a temperature ${T}…
Piezoelectric and dielectric measurements were performed on different batches of polarized NaNbO 3 ceramics. It has been established that, as a result of polarization, in these ceramics there appears a metastable ferroelectric phase existing for a long time. The presence of this phase manifests itself as a piezoelectr…
We report the preparation and solid-state characterization of the perchlorophenalenyl radical (1). The radical is initially obtained as a yellow-green solid by reduction of the perchlorophenalenium salt (12(+)). This solid sublimes in a sealed tube to give black shiny hexagonal crystals of the perchlorophenalenyl radi…
An efficient method is described to handle mesh indexes in multidimensional problems like numerical integration of partial differential equations, lattice model simulations, and determination of atomic neighbor lists. By creating an extended mesh, beyond the periodic unit cell, the stride in memory between equivalent…
The performance of basis sets made of numerical atomic orbitals is explored in density-functional calculations of solids and molecules. With the aim of optimizing basis quality while maintaining strict localization of the orbitals, as needed for linear-scaling calculations, several schemes have been tried. The best pe…
We study the influence of surface roughness on the adhesion of elastic solids. Most real surfaces have roughness on many different length scales, and this fact is taken into account in our analysis. We consider in detail the case when the surface roughness can be described as a self affine fractal, and show that when…