Materials Literature
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A relation for the temperature evolution of multicomponent porous ices is derived from the energy equation of multicomponent systems. It is demonstrated that the predominant energy transfer mechanisms can be incorporated into an effective thermal conductivity (λ e ƒƒ ), which is strongly temperature dependent, and tha…
. The literature on the diagenetic conversion of smectite layers to illite layers in mixed-layer illite/smectite is reviewed. According to this smectite layers are converted to illite layers during diagenesis at temperatures above 55°C and illite/smectites become IS ordered at about 100°C and at illite percentages of…
A high reverse breakdown voltage hydrogenated amorphous carbon (a-C:H)/crystalline silicon (c-Si) heterojunction diode has been successfully prepared by the photochemical vapour deposition (photo-CVD) method. This method has the advantage of being free from RF radiation. There is a lower density of fixed charges at th…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
It has often been said that 'the structure factors of all liquids (and glasses) look the same'. Those working in the field know that there is a certain truth to this, as many of the basic features are determined by hard sphere packing. However they also know that there are differences, sometimes subtle, which depend o…
Measurements have been made of the x-ray reflectivity from ultrathin, amorphous carbon films both before and after annealing. Analysis of the x-ray results indicates that annealing causes an increase in film thickness with a corresponding decrease in density. Such behavior is uncharacteristic of amorphous thin films a…
We have investigated the thermal conductivity of large diamond samples grown by both hot filament and microwave plasma assisted chemical vapor deposition in order to study in detail the processes limiting heat conduction in this system. For samples containing nearly 100% diamond material and no apparent defects, the t…
The three-dimensional structure of hevein, a low molecular weight protein isolated from the latex of Hevea brasiliensis, has been determined by X-ray diffraction at 2.8 A resolution. The protein crystallizes in space group P2(1)2(1)2(1), with lattice constants a = 21.78, b = 31.86, c = 51.12 A. The structure was solve…
An X-ray single-crystal determination of the CuO structure has been made at 196 K, i.e. below the Neel temperature 230 K, and, as a check, the crystal structure at room temperature was also determined. The correct space group for the structure at both temperature was found to be Cc. Earlier results of magnetic and neu…
The perovskite structure of the relaxor PbMg 1/3 Nb 2/3 O 3 (PMN) is studied using X-ray and neutron powder diffraction data. The static diffuse scattering (SDS) observed in the diffraction patterns at low temperatures is interpreted using a two-phase Rietveld analysis. The structural model is based on a long-range st…
Abstract The interaction between several polymeric materials, typical of those that have application as parenteral product containers, and 16 marker solutes was evaluated. Polymers used included polypropylene, polyvinyl chloride, ethylenevinyl acetate, an olefin rubber, a polyester ether block copolymer, and various c…
Abstract Compression ultrasonic velocity, longitudinal ultrasonic absorption, and heat of mixing for NR‐BR, NR, NBR, and NR‐IIR rubber blends were measured. Results show the applicability of examining the compatibility degree by using longitudinal ultrasonic absorption techniques. Results showed that NR‐BR blends are…
Abstract Silicone polyimides were made with siloxane‐equilibrated 1,3‐bis (3,4‐dicarboxyphenyl) ‐ 1,1,3,3‐tetramethyldisiloxane dianhydride (PADS) as the soft portion and [(1‐methylethylidene) bis (4,1‐phenyleneoxy)] bis‐1,3‐isobenzofurandione (BPADA) as the hard portion in combination with either para or meta ‐phenyl…
Abstract Systematic studies of the gelation of both buffered and unbuffered aqueous Cr +3 /polyacrylamide solutions show that the gelation time is a strong function of pH, increasing by about one order of magnitude per unit decrease in pH for polyacrylamides less than about 7.5% hydrolyzed. The gelation rate also depe…
Abstract The objective of this study was to improve the durability and stability of urea‐formaldehydebonded wood products by decreasing the internal stress developed during resin cure and by improving the ability of the cured system to withstand cyclic stresses. Urea‐formaldehyde resins were modified by (i) incorporat…
We have studied the influence of flexibility on liquid water properties for two different potentials of intramolecular motion. Care has first been taken to explore thoroughly the simulation conditions to obtain reliable results free from artificial influences. Grafting an intramolecular potential on top of an original…
A series of Li–Cd mixed ferrites are prepared by the well-known double sintering ceramic technique. From the X-ray diffraction studies lattice parameters are calculated and their variation with composition is explained on the basis of tetrahedral ionic radius. The longitudinal and shear wave velocities as a function o…
FeTiO3 powder is prepared from aqueous solution (wet method). Magnetic properties of the sample are the same as those of FeTiO3 prepared by calcination. Dielectric properties of the powder are investigated from 4.2 K to room temperature. There are two dielectric relaxations in the low temperature region. One is observ…
A series of Li–Zn mixed ferrites with composition formula Li0.5–0.5xZnxFe2.5–0.5xO4 is prepared by the solid-state reaction method. The variation of lattice parameter with composition is explained on the basis of tetrahedral ionic radius. Thermopower studies are undertaken over a temperature range 300 to 750 K by the…
Kinematical studies of glass transition and crystallization in glassy Se80−xTe20Inx are made using DSC technique. From the heating rate dependence of the glass transition and crystallization temperatures the activation energy, ΔEt, for the relaxation time controlling the structural enthalpy as well as the activation e…