Materials Literature
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The morphology of amorphous solid water grown by vapor deposition was found to depend strongly on the angular distribution of the water molecules incident from the gas phase. Systematic variation of the incident angle during deposition using a collimated beam of water led to the growth of nonporous to highly porous am…
Static and dynamic mechanical deflections were electrically induced in cantilevered, multiwalled carbon nanotubes in a transmission electron microscope. The nanotubes were resonantly excited at the fundamental frequency and higher harmonics as revealed by their deflected contours, which correspond closely to those det…
A series of electronically conducting polymers based on fluorine-substituted phenylene thienyl have been synthesized. The series includes poly-1,4-bis(2-thienyl)benzene (pTHB), poly-1,4-bis(2-thienyl)-2-fluorobenzene (pTFP), poly-1,4-bis(2-thienyl)-2,5-difluorobenzene (pTF2P), and poly-1,4-bis(2-thienyl)-2,3,5,6-tetra…
In the previous work, we have studied the effects of acoustic intensity, argon gas flow rate, surfactant concentration, and initial monomer concentration on polymerization rate, polymer particle number, and polymer molecular weight in the ultrasonically initiated emulsion polymerization of methyl methacrylate. In this…
The addition of a nonlinear filler in the form of particulate zinc oxide to insulating materials has been found to produce a marked nonlinear conductivity in the resulting composite. While retaining its excellent insulating properties at low electric fields, this composite material acquires a measure of conductivity a…
The problem of both electron and phonon scattering by wedge disclination dipoles (WDD) is studied in the framework of the deformation potential approach. The exact analytical results for the mean free path are obtained within the Born approximation. The WDD-induced contribution to the residual resistivity in nanocryst…
Taxol, an anticancer substance, was adsorbed into FSM-type mesoporous silicas with the pore sizes larger than 1.8 nm, while it was not adsorbed into the channels with the pore size less than 1.6 nm, indicating that mesoporous silicas have a molecular sieving property for relatively large molecules. The adsorption beha…
Using first principles electronic structure calculations we screen nine elements for their potential to retard oxygen diffusion through poly-crystalline Pt (p-Pt) films. We determine that O diffuses preferentially as interstitial along Pt grain boundaries (GBs). The calculated barriers are compatible with experimental…
It is shown that the covering approach with a single decagonal prototile can be transformed into a hexagon, boat and star tiling. Particularly, the atomic decoration recently proposed by Cockayne and Widom (Phys. Rev. Lett. 81, 598 (1998)) as a structure model for the decagonal phase is investigated. There, conflicts…
We wish to report in this paper a study of the effective mass (m^*) in thin-oxide Si-metal-oxide-semiconductor field-effect-transistors, using the temperature dependence of the Shubnikov-de Haas (SdH) effect and following the methodology developed by J.L. Smith and P.J. Stiles, Phys. Rev. Lett. {\bf 29}, 102 (1972). W…
We present the experimental results for Nb/Au/YBaCuO structures, in which the current flows along (001) direction of YBaCuO film. The theoretical evaluations show, that at the experimental values of the Au/YBaCuO interface transparency, determined from the interface resistance D~10^-6, the critical current of the stru…
Detailed analyses of coal ash deposits were performed with the use of SEM, X-ray, and image analysis in order to characterize local deposit properties as a function of position. Such analyses are important for understanding and predicting the thermal and physical properties of ash deposits. The present study used meas…
Li 2 S−SiS 2 −Li 3 N fast lithium ion conducting glasses were prepared by a melt-quenching procedure for the compositions (60 − 3 x /2)Li 2 S·40SiS 2 · x Li 3 N ( x = 0, 3, 5). Both temperatures of glass transition and crystallization increased with an increase in the Li 3 N content. The temperature dependence of cond…
The dependence of the spin reorientation transition in ultra-thin ferromagnetic films on external magnetic fields is studied. For different orientations of the applied field with respect to the film, phase diagrams are calculated within a mean field theory for the classical Heisenberg model. In particular we find that…
The first part of this article centers on the fact that key features of the dynamical response of weakly-correlated materials (the alkalis, Al), have been found experimentally to differ qualitatively from simple-model behavior. In the absence of ab initio theory, the surprises embodied in the experimental data were im…
Creatine kinase is a key enzyme in the energy homeostasis of cells and tissues with high and fluctuating energy demands. Human muscle MM creatine kinase is a dimeric protein with a molecular weight of approximately 43 kDa for each subunit. It has been crystallized by the hanging-drop vapor-diffusion method using 2-met…
The paper is devoted to a determination of effective piezoelectric coefficients d3j poly and e3j poly (j = 1, 2, 3) of boracite crystals with 180° domain structure. Some features of these coefficients and their anisotropy are studied for different domain volume concentrations and/or temperatures.
Phosphorus (P) doped diamond thin films were grown by microwave plasma-assisted chemical vapor deposition (CVD) using phosphine (PH3) as a dopant source. The addition of PH3 in the gas ambient significantly influenced the optimal growth condition for diamond. The {111} surface of diamond was found to be the best surfa…
PMN ceramics present piezoelectricity under an applied dc bias field. The relative dielectric permittivity varies, in general, over a wide range of values of the applied dc electric field. The purpose of this work is to study the induced piezoelectricity effect produced by an applied dc electric field in the 2.7PMN-0.…
Abstract The mechanism of 2- t -butylbenzothiazole sulfenamide (TBBS) accelerated sulfur vulcanization of polyisoprene was investigated. Samples of compounded rubber were heated in a differential scanning calorimeter to preselected temperatures or degrees of vulcanization, the reaction stopped, and the products analyz…