Materials Literature
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In PbTiO 3 (2.2–398 nm in thickness)/Pt/MgO(100) structure, the dependence of the crystalline structure and lattice parameters of PbTiO 3 thin films on the film thickness was investigated using the θ-2θ XRD method and the energy dispersive typed total reflection X-ray diffraction method (ED-TXRD). By using the ED-TXRD…
Abstract Flexible clear PVC compounds tend to yellow and darken during and after exposure to gamma radiation. This has been an obstacle to their use in the medical market. The purpose of this investigation was to improve the gamma stability of flexible PVC. The variables of interest were resin molecular weight, plasti…
Multishell carbon nanotubules are studied by means of diffraction contrast dark field images. This results in an electron microscopy method for the determination of the sign of the chiral angles in carbon nanotubes. The method is justified by a reasoning either in direct space or in diffraction space. We also investig…
Abstract The morphology of the dispersed phase in immiscible polymer blends can have a significant effect on the final may be omitted physical properties. Laminar dispersion of an ethylene vinyl alcohol copolymer (EVOH) with high oxygen barrier properties was obtained in the matrix of low density polyethylene (LDPE) w…
Dichlorosilicon complexes of substituted tetra-2,3-pyrazinoporphyrazines were obtained via condensation of 2,3-dicyanopyrazine, 2,3-dicyano-5,6-diphenylpyrazine, 2,3-dicyanoquinoxaline, 2,3-dicyano-benzo[f]quinoxaline, and 2,3-dicyano-dibenzo[f,h]quinoxaline with silicon tetrachloride in the presence of urea, quinolin…
BaTiO 3 powders of 0.2 µ m and 0.5 µ m particle size diameters were prepared by changing the calcination temperature of BaTiO 3 synthesized by a hydrolysis method. Glass frit mainly consisting of SiO 2 was added as a sintering aid. In the case of using 0.2 µ m powder, grains grew to 0.5 µ m in diameter at sintering. C…
Experimental measurements of the light scattered from a metallic circular cylinder, with a section diameter comparable with the incident wavelength, upon a metallic flat substrate are presented. The validity of the theoretical numerical calculation obtained from a one-dimensional model based on Maxwell's coupled integ…
A one-dimensional diffusion model for H2 plasma obtained under moderate pressure discharge conditions is presented. The transport equations resulting from this model are solved and enable the estimation of the axial profiles of the plasma species densities and of plasma temperatures on the axis of a diamond deposition…
In high temperature gas-cooled reactors (HTGRs), coated particles are used as fuels. For upgrading HTGR technologies, Japan Atomic Energy Research Institute has been developing high burnup Tri-isotropic (TRISO) coated fuel particles. The TRISO coatings consist of a low-density, porous pyrolytic carbon (PyC) buffer lay…
Abstract A method for the calculation of phase diagrams (tie lines and binodal, spinodal, critical points and their stability) based exclusively on the Gibbs energy of mixing with no need of its derivatives with respect to the composition variables is extended to multinary mixtures for any number of components. The ma…
The structural chemistry of the IIA group metal diketonates (M=Mg, Ca, Sr, Ba) is reviewed. A special attention is given to Ba compounds as the most challenging in MOCVD of HTSC thin films. The structures are described according to the structural principles: nuclearity, types of ligands and the coordination modes. Som…
We calculate using mean field theory, the cholesteric pitch in systems composed of chiral molecules, which we model as ‘corkscrews’. We consider both the rigid and semi-flexible limits. Our result for the cholesteric pitch depends on the intrinsic molecular pitch length as well as the concentration of molecules, but d…
A conducting network of crystalline [bis(ethylenodithio)tetrathiafulvalene]2I3 (ET2I3) can be formed within the surface layer of polycarbonate by exposure of films containing 2 wt.% of molecularly dispersed ET to vapours of iodine solution in CH2Cl2, THF or TCE. The relationship between the microstructure and properti…
The electrochemical behavior of A516 grade 70 (UNS K02700) carbon steel with a ferrite-pearlite structure in acidic chloride (Cl–) solutions containing hydrogen sulfide (H2S) at 25°C was investigated by electrochemical impedance spectroscopy (EIS). Results showed the impedance of A516 steel increased in an acidic Cl–…
(Pb, La)(Zr, Ti)O 3 (PLZT) thin films were deposited on 6-inch Pt/Ti/SiO 2 /Si substrates by rf magnetron sputtering using a multichamber production system. The Pb content in PLZT films deposited at low temperature was measured by inductively coupled plasma (ICP) spectroscopy, and the structural properties of crystall…
Abstract The influence of stearic acid, linoleic acid and their methylesters on crystallization of synthetic cis -1,4-polyisoprene was investigated at the isothermal crystallization temperature of −25°C by means of differential scanning calorimetry and dilatometry. The overall crystallization rate of cis -1,4-polyisop…
Silver has high reflectivity in the visible and infrared but cannot be used fully because of its distressing lack of durability. A technique that uses the surface plasmon resonance phenomenon offers a sensitive method for studying the corrosion of silver and assessing improvements. It has been used in the investigatio…
Abstract Poly(vinyl chloride) (PVC) is the leading polymeric material used in medical device and packaging applications in terms of total volume consumed. It offers a uniquely broad range of properties for a wide variety of applications in the medical and health care industry. It fulfills an extensive range of perform…
Gentisate 1,2-dioxygenase (E.C.1.14.13) was purified to homogeneity from Klebsiella pneumoniae M5a1, a soil bacterium able to degrade a great variety of aromatic compounds. The molecular mass of the purified holoenzyme was 159 kDa and its structure was deduced to be a tetramer with 38 kDa per subunit. Gentisate 1,2-di…
An optimized interparticle potential has been developed for its use in computer molecular dynamics simulations of vitreous boron trioxide (v-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$) which includes four-particle interactions. This is required to force the formation of planar six-membered (boroxol) rings in such simulation…