Materials Literature
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We calculate the current and electrostatic potential drop in metallic carbon nanotube wires self-consistently by solving the Green's function and electrostatics equations in the ballistic case. About one-tenth of the applied voltage drops across the bulk of a nanowire, independent of the lengths considered here. The r…
Abstract Aqueous gel‐like lyotropic liquid crystals with extensive hydrogen bonding and nanoscale hydrophilic compartments have been used to define the growth of macroscopic nanotemplated CdS and CdTe thin films. These mesoporous semiconductor films contain a hexagonal array of 2.5 nm pores, 7 nm center‐to‐center, tha…
Self-assembly of a new precursor [Cu(L)](ClO4)2 (1) (L = macrocyclic ligand) with octacyanometalates [M(CN)8]3- (M = Mo, W) produced two-dimensional cyano-bridged Cu(II)-M(V) bimetallic assemblies [Cu(L)]3n[M(CN)8]2n.6nH2O [M = Mo (2), W (3)] with novel honeycomblike structures, characterized by spectroscopic data, si…
Capacitance aging under DC electric fields has been studied on multilayer ceramic capacitors (MLCCs) with X7R characteristics. The capacitance change with time was divided into two consecutive stages. The first stage was due to the nonlinear permittivity of dielectrics and it should not be involved in the aging phenom…
Abstract Gas (atmosphere) carburizing is the de facto standard by which all other surface hardening techniques are measured and is the emphasis of this chapter. Initially, the chapter describes the process and equipment for gas carburizing. This is followed by sections discussing the processes involved in quenching, h…
Abstract CdS micropheres were prepared by a hydrothermal microemulsion method in cyclohexane/Triton X‐100/pentanol/water at 180 °C. The as‐prepared samples were characterized by X‐ray diffraction analysis, transmission electron microscopy, electron diffraction, energy diffraction X‐ray analysis and photoluminescence s…
Deformation and recrystallization texture has been investigated in Oxygen free high conducting (OFHC) copper wires drawn at room temperature to true strain of 2.31, and isothermally annealed at various temperatures between 150°C and 750°C. Local orientations of the microstructures were measured by means of electron ba…
The phase trajectories of carbon heated in various regimes by a high-power electric current pulse have been theoretically calculated. It is shown that diamond can be synthesized from a liquid phase in the regime of high-energy electric explosion.
The localized corrosion behavior of Alloy 22 (UNS N06022) in acidified (pH = 3) sodium chloride (NaCl) brines at elevated temperature (80°C) and under potentiostatic and open-circuit conditions has been investigated. Both pitting corrosion and intergranular attack are observed on specimens polarized into the transpass…
Self-assembled PbTiO 3 nanoisland structures were fabricated on Pt/SiO 2 /Si at 400°C by metalorganic chemical vapor deposition. The average width and height were 35 and 1.9 nm for PbTiO 3 grown for 10 s, and 35 and 3.6 nm for that grown for 20 s, respectively. In-plane X-ray diffraction showed that PbTiO 3 nanoisland…
Crystallization of sol-gel derived Pb 1−x Ca x TiO 3 powders have been investigated using TG-DTA technique, X-ray diffraction and FT-IR spectroscopy. The thermograms obtained on as fired PbTiO 3 powder showed a dominant exotherm at ∼450°C, and is well supported by X-ray diffraction indicating single-phase formation. W…
Abstract Transition metal complexes of linear and crosslinked styrene‐maleic acid copolymer were prepared in ethyl alcohol. The complexes appear as micro clusters fairly uniformly distributed in the copolymer matrix. Vapor adsorption–desorption studies of the complex beads with methyl isobutyl ketone (MIBK), toluene a…
Abstract Mica-chlorite mixed-layering was identified by X-ray diffraction (XRD) as a major or subordinate constituent in several slates of the Puncoviscana Formation from Sierra de Mojotoro (Eastern Cordillera, NW Argentina). In order to determine the crystallochemical characteristics of these mixed-layered sequences…
The advantages and uniqueness of the Inorganic modification of the Sol-Gel method have already been described. Homogeneous nano-composites as well as some exotic glasses, complex-metal-oxides systems with little glass-forming ability, can be produced by this method. Thus, the obtained materials are characterized by a…
The solid solution of the ferroelectric relaxor (Na 1/2 Bi 1/2 )TiO 3 with BaTiO 3 , (1-x) NBT-x BT (NBT-BT) shows a morphotropic phase boundary with enhanced properties at x = 0.06-0.07. We have prepared targets.of (1-x) NBT-x BT with x = 0.06 by solid state reaction and sintering at 1200°C, up to a final relative de…
The primary thermogram of the bamboo fibers belonging to the species Dendrocalamus strictus is recorded in an inert atmosphere at a heating rate of 10 C/min. Using this thermogram and its derivative, initial and final degradation temperatures and inflection points are found. Using the Freeman and Carroll method, the k…
Abstract The phonon polariton modes in the bulk porous III–V semiconductor materials like GaP and GaAs are investigated for different porosity values. Their behavior under an external hydrostatic pressure is also studied. The frequencies of the various modes shift to higher values. The model has been extended to the c…
Synthesis of new, porphyrin-containing peptidyl aminophosphonates is described. The products, derived from 5-(4′-carboxyphenyl)-10,15,20-tri-p-tolylporphyrin and some heterocyclic aminophosphonates were obtained in high yield in the reaction of the 5-(4′-carboxyphenyl)-10,15,20-tritolylporphyrin with selected thiophen…
An efficient finite element method for predicting critical temperature, postbuckling deflection and flutter response is developed for composite plates embedded with prestrained shape memory alloy (SMA) fibers. The large panel deflection and the temperature-dependent material properties of SMA and composites are consid…
Hydrogen permeation tests were carried out on supermartensitic stainless steel membranes under cathodic protection conditions in ASTM seawater. In contrast to other observations, only a modest reduction in hydrogen uptake due to calcareous scale was observed after 75 days of exposure. In view of the variable results f…