Materials Literature
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In this study, sulfide based spinel materials of tin and titanium were synthesized (Cu2FeTi3S8 and Cu2FeSn3S8). A topotactic substitution of tin by titanium atoms was performed in order to obtain electrode materials with high specific capacity associated to a good conductivity. According to the first electrochemical t…
Electrical conductivity, differential scanning calorimetry and X-ray diffraction measurements have been performed on a single crystal of lithium hydrazinium sulfate, LiN 2 H 5 SO 4 , in the temperature range from 295 K to about 470 K. The crystal structures at several temperatures are determined in this temperature ra…
Polymer dispersed liquid crystal (PDLC) films are potentially useful in electro-optic devices since they can be used for vision products. In this work the PDLC thin films were prepared by a photopolymerization induced phase separation method and electro-optic properties of the films were investigated.
A cure kinetic model was presented to explain the reversion and the induction period commonly found in the vulcanization of rubber compounds. The model has three kinetic rate constants and one induction time which should be determined on the basis of isothermal rheometer curves. The torque curves calculated using the…
Transmission electron microscopy of the polycrystalline natural diamond, carbonado, reveals the existence of voidites, different from the voidites in type Ia natural diamonds, not only in their shape but also in their content and their origin. There is evidence that one group of voidites with an unusual shape is forme…
The effect of concentration of sodium hydroxide on the gelatinization of hypochlorite oxidized maize starches was thoroughly investigated. It was found that oxidation of starch increases its affinity towards gelatinization with alkali solutions at room temperature. Clear gelatinized starch could be obtained immediatel…
Time resolved small angle X-ray scattering is used to probe the microstructural changes occurring in a sample of poly(hydroxybutyrate), aged at room temperature, during a heating cycle designed to reverse any physical ageing. Evidence for the reversal of physical ageing is seen, but is unlikely to account for all the…
A new computer code, called ANFIBE (ANalysis of Fusion Irradiated BEryllium), has been developed to describe the most important processes (diffusion, gas precipitation, bubble coalescence, helium-bubble trapping, chemical trapping, etc.) thought to affect gas behavior and swelling in beryllium during fast neutron irra…
Abstract Poly(α‐methylstyrene‐styrene‐acrylonitrile) (AMSAN) is an additive used to improve the heat deflection temperature of PVC. The effect of its addition on the HDT of a typical injection molding formulation is studied. Other physical properties like impact strength, yield strength, modulus of elasticity, and vis…
This invited paper discusses chemical solution deposition (CSD) and characterization of ferroelectric and dielectric thin films. Liquid Source Misted Chemical Deposition (LSMCD) technology was employed to deposit thin films using Metal Organic Decomposition (MOD) precursors. The configuration of the LSMCD machine alon…
The epitactic growth of calcium hexaluminate (CA6) on the basal plane of alumina was observed during an investigation of the interaction between silicate glass films deposited on single-crystal alumina (α-Al2O3). Two distinctly different orientation relationships occurred. The first can be described as perfect hexagon…
In situ spectroscopic ellipsometry (SE) has been successfully used to accurately measure sputter deposition rates and optical constants of un-oxidized metal layers and to control the growth of magnetic multilayers. The structures include [Co/Cu]n, [Co/Au]n, [Co/Ni]n, [Co/Pd]n and [Co/Pd/Au]n. Layer thickness precision…
The synthesis of a hitherto unknown 6 : 5 phase in the quasi-binary system RbCl/PbCl2 and its structure determination is reported. The compound Rb6Pb5Cl16 crystallizes in the tetragonal space group P4/mbm with a large variety of different coordination polyhedra for the cations. Special feature of the structure is a st…
The nonspecific phospholipase C from Bacillus cereus is a zinc metalloenzyme that catalyzes the hydrolysis of phospholipids to yield diacylglycerol and a phosphate monoester. Glu-4 has been proposed as a potential candidate for the general base in the hydrolysis reaction and was shown to interact with the substrate he…
A series of cyclic(arylene ether) oligomers containing the phenylphosphine oxide moiety has been synthesized by reaction of bis(4-fluorophenyl)phenylphosphineoxide with dihydroxy compounds 1a–d as well as 1,2-dihydro-4-(4-hydroxyphenyl) (2H)phthalazin-1-one in DMF in the presence of anhydrous K2CO3 under high dilution…
The synthesis of a series of meso-5,15-diphenylporphyrins strapped by 2,2'-disubstituted biphenyl units (6H(2), 7H(2), 8H(2)) is described. The biphenyl straps used are linked via their 3,3'-positions by CH(2)O groups to ortho-positions of the phenyl rings of the 5,15-diphenylporphyrins. The straps of these porphyrins…
The broad molecular weight distribution (MWD) curves obtained by gel-permeation chromatography (GPC) of polyethylenes prepared in the presence of MgCl2 supported monometallic (Ti or Hf) and bimetallic (Ti/Hf) catalysts were analyzed by deconvolution into component curves. The MWD curves of the monometallic catalysts c…
Abstract A new method of measuring carbon black dispersion in rubber is presented. This method is based on the measurement of the light reflectivity from the rubber sample using standard equipment used in the evaluation of the tint strength of carbon black (ASTM D3265 procedure). This method can be applied for both un…
Abstract The technology of extruding rigid viyl foam has grown substantially over the last 10 years. Formulation additives, tooling and processing expertise have made possible a variety of applications such as profile, sheet, and foam core pipe. Many PVC foam manufactures are interested in reducing the density of thei…
Fractographic features related to fatigue growth in a titanium alloy Ti–6Al–3Mo–2Cr were examined in compressor disks that had failed in service. In‐flight block cyclic loading that included hold‐time loading and variable amplitudes of vibrational loading produced fracture characteristics which mainly reflected the tw…