Materials Literature
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A diglycidyl-ether of bisphenol-A (DGEBA)/Triethylenetetramine (TETA) system was studied by non-isothermal differential scanning calorimetry (DSC) to establish its kinetics of cure. The DGEBA resin was Araldite GZ 601 X75 used in the marine coatings formulations. Previously, the optimum resin/hardener ratio was determ…
The ferroelectric polymorph of lead metaniobate (PbNb2O6) presents an orthorhombic structure that is metastable at room temperature. This phase is obtained by quenching from high temperature. The fabrication of lead niobate thin films with this orthorhombic form has been reported to be difficult due to the presence of…
Abstract The octaanion, [OSiO 1.5 ] 8 8− (OA) is a low cost, discrete nano silica particle that can be made directly from high surface area, amorphous silica reacted with Me 4 NOH in water alcohol mixtures. It would be ideal if Me 4 NOH could be formed in situ from, for example, Me 4 NCl and NaOH, as long known in the…
The structure of metastable, incommensurately modulated Na(2)Si(3)O(7) has been determined from single-crystal X-ray diffraction data. In contrast to previous investigations which stated that the compound crystallizes in an orthorhombic space group, this study shows that the compound is monoclinic with a pseudo-orthor…
Hexagonal zinc sulfide nanocrystals (ZnS NCs) were prepared under mild solvothermal condition at 170°C with the polymer ester used as ligand for their stability and effective passivation. Well-defined absorption peaks with the largest blueshift of 89nm were observed for the ZnS NCs based on the ultraviolet-visible (UV…
The total conductivity and oxygen deficiency of partially substituted strontium ferrite, SrFe0.9M0.1O3-δ (M=Cr, Ti, Al), at 700-950°C were measured depending on oxygen partial pressure varying in ranges 10-19-0.5 and 10-5-0.5 atm. The partial contributions of n- and p-type electronic charge carriers and oxygen ions to…
To grow single crystals within the solid solutions between PbZrO3 and PbTiO3, PbZrxTi1- xO3 or PZT, is very difficult when compositions are around the morphotropic phase boundary (MPB). In this work, the PZT single crystals were grown by the high temperature solution method, using fluxes with a constant composition, d…
trans-PtCl(2)(dms)(2) (dms is dimethyl sulfide) crystallizes in the space group P2(1)/n and adopts the molecular point group C(i), which is the most frequently occurring point group for trans-PtX(2)L(2) complexes (78%), as observed in the Cambridge Structural Database (CSD; 2005 release), followed by C(1) (16%). Densi…
Barium titanate single crystals had been placed in 0.01M NaOH solution to deposit hydrogen on their electrodes through the electrolysis of water. Two kinds of time-dependent changes in dielectric properties of the single crystals were observed: One occurred in the course of hydrogen deposition and the other lasted for…
The chemical reactions resulting from ultraviolet radiation produce discoloration and significant changes in the surface properties of polycarbonate (PC). To prevent photon absorption from irradiation and oxygen diffusion and to enhance the surface nanomechanical properties of PC, thin ceramic coatings of ZnO and Al2O…
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Atomistic study of cross slip of a screw dislocation in copper is presented using the action-optimization numerical technique which seeks the most probable dynamic pathway on the potential-energy surface of the atomic system during the cross-slip process. The observed mechanism reveals features of both competing mecha…
Multiferroic materials possess two or more types of orders simultaneously that couple the electric and magnetic fields, rendering them a rich variety of microstructural phenomena and macroscopic properties. In this paper, we derive explicit closed-form expressions of magnetoelectric Green's functions for uniaxial mult…
We report a self-organized copper electrodeposition without imposed templates and induced additives. The deposit morphology on the silicon substrate varies from a branch to a parallel pattern by changing the applied voltage. We suggest that there are two essential factors for the formation of such kind of copper wire…
Ferroelectric domain structure and its evolution in uniaxial relaxor Ca0.28Ba0.72Nb2O6 single crystals were investigated using transmission electron microscopy. It was found that there exists a high density of 180° domain walls in the crystals. The domains appear predominantly spike shaped along the polar axis and hav…
The persistent currents as a function of the dimension, chirality, and deformation for various chiral carbon nanotori are investigated theoretically. It has been found that, for the undeformed torus, its persistent current is inversely proportional to the torus radius R, but independent of the torus width r, and becom…
We report on and analyze the textural transformations in islands, thicker circular domains, floating in very thin free standing chiral Smectic-C* liquid crystal films. As an island is growing, an initial pure bend texture of the director changes into a reversing spiral at a critical size. Another distinct spiral textu…
In situ neutron diffraction measurements during loading have been performed on plastically deformed superelastic NiTi samples. The measurements observed retained B19′ phase in the unloaded state as a result of the plastic deformation in otherwise completely B2 phase samples. A reversible stress-induced B2–B19′ transfo…
Abstract Hydrogen permeance and surface states of Pd‐Ag/ceramic composite membranes during preparation process were investigated. After thermal treatment in air, the composite membranes exhibited high hydrogen permeability and permselectivity. The sealing process did not change the states of Pd, Ag and O, although an…
In this paper we report a new type of cross-linked porous structure based on a chitosansoy protein blend system developed by means of combining a sol-gel process with the freeze-drying technique. The final structure was investigated by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR…