Materials Literature
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The structural and electronic properties of aluminum covered single wall carbon nanotubes (SWNT) are studied from first-principles for a large number of coverage. Aluminum-aluminum interaction that is stronger than aluminum-tube interaction, prevents uniform metal coverage, and hence gives rise to the clustering. Howe…
Electronic band structures for Ba$_{6}$Ge$_{25}$ and Ba$_{4}$Na$_{2}$Ge$_{25}$ clathrates are calculated using linear muffin-tin orbital method within the local density approximation. It is found that barium states strongly contribute to the density of states at the Fermi level and thus can influence the transport pro…
In the framework of a rather conventional cluster approach which combines the crystal field and the ligand field models we have considered different charge transfer (CT) states and O $2p$-Mn $3d$ CT transitions in ${\mathrm{MnO}}_{6}^{9\ensuremath{-}}$ octahedra. The many-electron dipole transition matrix elements wer…
Abstract The mechanical properties and the surface property of wood flour/continuous glass mat/polypropylene composites have been investigated. The suitability of wood flour as a filler for continuous glass mat–reinforced polypropylene has been tested using different mesh sizes (e.g., 20 and 40 mesh), as well as by va…
A surface-plasmon-resonance (SPR)-induced absorption band has been found for low-energy Ti+ implanted (subplanted) into single-crystalline SiO2 at specific substrate temperatures. The observed SPR absorption band is in the 650–850 nm wavelength range, i.e., in the visible (red) and near-infrared regions, indicating th…
The specific heat of an undercooled liquid TiAl alloy was measured by an electromagnetic levitation drop calorimeter and the related thermodynamic properties, difference in Gibbs free energy and change in entropy are calculated based on the experimental results and some well known models. Under the containerless proce…
Reaction of [Fe(acac)3], (NEt4)OAc and N(CH2CH2SH)3 in MeCN in the presence of NO gives (NEt4)[Fe(NS3)(NO)] (1) [where NS3 = N(CH2CH2S)3]. Complex 1 reacts with metal chloride solvates, giving insoluble compounds of stoichiometry MFe2(NO)2(NS3)2, probably having the structure [M{Fe(NS3)(NO)}2-S,S′] [M = Fe (2), Co (3)…
Strontium bismuth niobate (SBN) matrix composites containing Ag particles were prepared by the conventional solid-state reaction method. With the addition of Ag particles to the SBN matrix, the single-phase layered perovskite structure of the matrix was preserved and the sintering temperature of the system was lowered…
Abstract By using the technology of the sequential interpenetrating polymer network, a series of novel damping materials based on a polydimethylsiloxane (PDMS)/polyacrylate (PAC) matrix with polymethacrylate (PMAC) were synthesized. They have a controllable broad transition peak spanning the temperature range of 150–2…
Water-induced degradation in lead zirconate titanate (PZT) piezoelectric ceramics was studied by a comparison experiment. In one treatment, PZT rings were immersed in a 0.01 M NaOH solution for long periods of time; in the other treatment, PZT rings were placed in a 0.01 M NaOH solution and hydrogen was evolved onto t…
The Doi kinetic theory for flows of homogeneous, rodlike liquid crystalline polymers (LCPs) is extended to model flows of nonhomogeneous, rodlike LCPs through a nonlocal (long-range) intermolecular potential. The theory features (i) a nonlocal, anisotropic, effective intermolecular potential in an integral form that i…
We report the characterization of the ceramic SrIn0.1Ti0.9O3 thin film grown by laser molecular-beam epitaxy. The lattice constant is determined to be 0.3948 nm, slightly larger than that of the SrTiO3 substrate. Hall measurement confirms that this film is a p-type semiconductor either below 92 K or above 158 K. X-ray…
The template extraction of two porous clay heterostructures (PCHs), derived from natural montmorillonite (PMH) and synthetic saponite (PSH), has been studied. Extraction in methanol solvent in the presence of cations (H+) removes up to 90% of the templates in a reproducible way without a subsequent calcination step fo…
We have investigated the charge dynamics of the doped carriers in a prototypical double-exchange ferromagnet ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ by reflectivity measurements on cleaved surfaces of the single crystals. Even for wide-band ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{…
The piezoelectric responses of c-axis-oriented Pb(Zr0.53Ti0.47)O3 (PZT) thin films have been studied by measuring the stress-induced charge with an accurate charge integrator. These measurements reveal that the c-axis-oriented PZT films have high values of d33, which are several times those of ceramic materials. The i…
A chemical method has been developed for synthesizing boron nitride nanowires through the reaction of a mixture gas of nitrogen (N2) and ammonia (NH3) over nanoscale α-FeB particles at 1100 °C. Boron content in the product comes from the α-FeB catalyst itself. Transmission electron microscopic image indicates an abund…
The molecular process of crystallization from an oriented amorphous state was reproduced by molecular dynamics simulation for a realistic polyethylene model. The initial oriented amorphous state was obtained by uniaxially drawing an isotropic glassy state at 100 K. By the temperature jump from 100 K to 330 K, there oc…
We report measurements of the thermoelectric power (TEP) S and electrical resistance R of thin films of tangled ropes of single-walled carbon nanotubes. Experiments at 300 K under applied force normal to the plane of the film revealed a $\ensuremath{\sim}10--20 %$ decrease in the four-probe resistance, indicating that…
A systematic Raman study of boron carbonitride (BCN) nanotubes, synthesized by bias-assisted hot filament chemical vapor deposition, is reported. Raman spectra up to the fourth order are observed from the BCN nanotubes. Comparing with pure carbon nanotubes, the Raman bands in BCN nanotubes are broadened and the relati…
La-substituted bismuth titanate [Bi4−xLaxTi3O12(BLT)] films were synthesized using pulsed-laser deposition and ferroelectric fatigue phenomenon was investigated. The internal strain present in the films, which was analyzed through the evaluation of the x-ray diffraction peak, was partially responsible for the fatigue…