Materials Literature
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Abstract Smectites are a major mineral group often found in the clay fraction of soils. Our objective was to evaluate the effect of pedologic environments on smectites in the arid Carrizo Plain, California. Six pedons (one Argixeroll, three Haploxeralfs, one Natrargid, and one Salorthid) were described and sampled alo…
Abstract Fe 2 O(SeO 3 ) 2 , frequently obtained in various chemical systems by low-hydrothermal treatment of SeO 2 and FeC 2 O 4 · 2 H 2 O, has been investigated using single-crystal X-ray diffraction. Crystal data (at room temperature): space group Pccn , a = 6.639(2) Å, b = 12.839(4) Å, c = 13.266(4) Å, V = 1130.8(6…
The reforming of a paraffinic naphtha was studied in order to determine the influence of chlorination during the run. Experiments were performed at 505°C, 15 kg cm−2, WHSV = 4, H2: HC= 4, and with or without an 8 h initial period of deactivation at 1 kg cm−2. A commercial Pt–Re/Al2O3 (0·3% Pt, 0·3% Re, 0·04% S, 0·15%…
Poly(ether ether ketone) and poly(ether diphenyl ether ketone) homopolymers are prepared by nucleophilic substitution routes. Miscibility of PEEK/PEDEK blends has been studied by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (d.s.c.). The results indicate that for PEEK/PEDEK blends, when th…
Studies have been carried out on polyurethane elastomers based on modified castor oil in combination with different molecular weights of polyethylene glycol and polymeric methylene diphenyl-4,4′-diisocyanate (PMDI). The resulting polymers were cast into molds and the moldings were characterized by scanning electron mi…
Abstract A new water‐insoluble polysiloxane containing pendant Ru(bpy) (bpy = 2,2′‐bipyridine) was studied with respect to the photoluminescence and its quenching by dioxygen. The emission was quenched by O 2 in water more efficiently than in gas phase, and the Stern‐Volmer plots showed a downward deviating curve. To…
Particle statistics in quantitative X-ray diffractometry relates to the number of particles (crystallites) contributing to the diffracted intensity for a given line. Variations in line intensity between replicate preparations of the same sample arise from statistical variations in the number of diffracting particles.…
Adducts [( dmso )nLn(O2NO)3], obtained by the crystallizatior , of lanthanoid (III) nitrate ( Ln (NO3)3.-xH2O) with excess dimethyl sulfoxide (' dmso ') in methanol or ethanol, have been the subject of a series of room-temperature single-crystal X-ray studies, defining more clearly the manner in which stoichiometry an…
SHOCK®: Injury, Inflammation, and Sepsis: Laboratory and Clinical Approaches includes studies of novel therapeutic approaches, such as immunomodulation, gene therapy, nutrition, and others. The mission of the Journal is to foster and promote multidisciplinary studies, both experimental and clinical in nature, that cri…
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…