Materials Literature
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In the framework of the Peierls model generalized to two dimensions the dissociation of a dislocation in the {111} plane of a fcc lattice into two Shockley partials is studied by a variational procedure. Each partial is made up by a distribution of infinitesimal dislocations with a density obtained by a superposition…
Microstructural development of thin‐film barium strontium titanate (Ba x Sr 1– x TiO 3 ) as a function of strontium concentration and thermal treatment were studied, using transmission electron microscopy (TEM) and X‐ray diffractometry (XRD). Thin films, ∼250 nm thick, were spin‐coated onto Pt/Ti/SiO 2 /Si substrates,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTN-Confused Expanded Porphyrin: First Example of a Modified Sapphyrin with an Inverted N-Confused Pyrrole RingSimi K. Pushpan, Alagar Srinivasan, Venkataramanarao G. Anand, Sundararaman Venkatraman, Tavarekere K. Chandrashekar, Bhavani S. Joshi, Raja Roy, and Hiroyuki F…
Abstract The dynamic mechanical behavior of molecularly oriented semicrystalline polyethylene terephthalate (PET) induced via the equal‐channel angular extrusion (ECAE) process was investigated. Dynamic mechanical analyses in both torsional mode and bending mode were utilized. The results indicate that the ECAE‐orient…
A banded spherulite of bacterial poly(3-hydroxybutyrate) (band spacing 120 μm) was linearly scanned along the radial direction in 3 μm steps by means of microfocus X-ray diffraction using a synchrotron source with a beam diameter of 3 μm. A large number of X-ray patterns was collected inside each band. Those taken at…
The deformation of Cu single crystals at 4.2 K was studied by simultaneous measurements of mechanical and electrical properties. The aim was to extend the study of low-temperature deformation to higher strains than are usually employed; thus most of the crystals were stretched to failure. The deformation can be divide…
Very accurate electron structure factors measured by a significantly improved transmission electron diffraction technique for polycrystalline samples were used in a high-resolution quantitative study of the electrostatic potentials in LiF, NaF, and MgO crystals. The spatial electrostatic potential distribution was obt…
The temperature dependence of the surface tension was measured by the pendant drop method for four compounds from the homologous series of alkylcyanobiphenyls (nCB), in the nematic liquid crystal and isotropic phases. For 8CB (octylcyanobiphenyl) the temperature dependence was also measured in the smectic range. Not v…
Vascular corrosion casting has been used for about 40 years to produce replicas of normal and abnormal vasculature and microvasculature of various tissues and organs that could be viewed at the ultrastructural level. In combination with scanning electron microscopy (SEM), the primary application of corrosion casting h…
The reaction of hexacyanochromate(III) with Ni(tmc)2+ (tmc = tetramethylcyclam) leads to the formation of the layered compound [Ni(tmc)]3[Cr(CN)6]2·18H2O displaying a corrugated sheet structure. Within each layer, the Ni(tmc) units are surrounded by two Cr(CN)6 complexes in a trans fashion while the Cr(CN)6 units are…
Methods of characterizing colloidal interaction potentials of nanoscale silver particles during their formation are discussed. Silver sols are produced by the borohydride reduction of silver perchlorate, and their colloidal stability is found to vary both with reaction conditions and over the course of the reaction. S…
Novel, soluble poly(9,9-dialkylfluorene)/poly(2-alkylaniline) block copolymers were synthesized following a three-step synthetic procedure: (i) aryl-aryl coupling of alkylated dibromofluorenes and fluorene diboronic esters according to Suzuki in the presence of 4-nitrobromobenzene as a monofunctional end-capping reage…
The formation of Ni surface precipitates on natural soil materials may occur during sorption under ambient environmental conditions. In this study, we examined proton‐ and ligand‐promoted dissolution of Ni surface precipitates on pyrophyllite, talc, gibbsite, amorphous silica, and a mixture of gibbsite and amorphous s…
We report the orientations of thermotropic liquid crystals to be coupled through dipolar interactions to the electric fields of electrical double layers that form upon contact of the liquid crystals with model surfaces presenting sodium carboxylate salts. The surfaces were prepared by the self-assembly of HOOC(CH 2 )…
Indium tin oxide (ITO) thin films were deposited on polymeric substrates at room temperature by dc reactive magnetron sputtering from an In–Sn (90–10 wt%) alloy target. The electrical, optical, and mechanical properties of ITO films on various substrates such as polycarbonate, acrylic, polyethylene terephthalate, and…
A wide variety of polymer nanocomposites exhibiting novel property combinations were obtained via in-situ formation of silicate nanofillers during polymerization and processing. Key intermediates were tailor-made silicates which were renderer organophilic by means of cation exchange and exfoliated upon applying shear…
p -type antimony telluride thin films and n-type bismuth telluride thin films have been deposited by coevaporation on glass substrates. The conditions for deposition have been investigated as a function of substrate temperature (Ts), flux ratio (Fr=F(Te)/F(Sb, Bi)) and optimized to achieve a high thermoelectric power…
A new formula aimed at calculating ohmic losses in switch-mode power supply (SMPS) transformers is presented. It is based on intensive two-dimensional (2-D) finite element method (FEM) simulations, the results of which have been summarized in a closed-form formula following a "semi-empirical" approach. The main benefi…
Previously we have shown how to obtain the electric properties of a polymer or other periodic system at the coupled Hartree–Fock level by direct, analytical calculation rather than by extrapolation of oligomer results. Here we add computationally simpler noniterative formulas and test the methodology for the longitudi…
In silicon and other materials with a high Peierls potential. dislocation motion takes place by nucleation and propagation of kink pairs. The rates of these unit processes are complex unknown functions of interatomic interactions in the dislocation core, stress and temperature. This work is an attempt to develop a qua…