Materials Literature
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Two classes of liquid crystals of good chemical stability are discussed, which are characterized by high response speed. The epoxy compound have a fairly high spontaneous polarization, 30 nC cm−2, whereas the lactic ethers show the somewhat lower values of 10 and 14 nC cm−2. Tilt angle, polarization, and viscosity mea…
Quantitative study of the protonation and deprotonation equilibria of meso-tetra-(p-sulphonatophenyl)porphyrin, H2TPPS4–, as well as the formation equilibria of the Cu2+ and Zn2+ complexes, in a Me2SO-water (80 : 20) solution, has allowed us to determine for the first time the stability constants of two metalloporphyr…
Adsorption characteristic of the silver nitrate impregnated silica gels developed for radioiodine was examined. The effects of various operating condi-tions on decontamination factors and adsorption capacities of elemental iodine and methyl iodide were investigated. Results show that this sorbent has good adsorption c…
Changes in shape of internally pressurized tubes caused by operating temperatures and pressures are enhanced by fast neutron irradiation. Lengths and diameters of Zr-2.5 wt% Nb pressure tubes in CANada Deuterium Uranium-Pressurized Heavy Water (CANDU-PHW) power reactors and test reactors have been monitored periodical…
The existence of a sharp transition of high-temperature creep behavior in bcc solid solutions has been confirmed by studying steady-state creep characteristics of an Fe-2.1mol% (3.56mass%)Mo alloy in the temperature range T from 1 100 to 1200K under the tensile stress range a from 4 to 50MPa. In the lower stress regio…
Abstract Digital image acquisition is of great interest in SEM, as can be proven by the number of ways in which images can be improved by processing with this technique ( Desai and Reimer 1985, Hawkes 1981). In the case of the system described here, this interest is enlarged by the facility of storage and retrieval of…
Abstract The effect of the P‐content in iron (0.002‐0.12% P) and the stirring rate on the corrosion rate of five Fe‐P alloys in H 2 SO 4 and HCl solutions (pH = 0) has been investigated. It was assumed that phosphine generated during corrosion process acts as a stimulator of the cathodic process (at low concentrations…
Relations between the interfacial and the chemical-structural features of oxides are of concern in several fields. Ferrites appear as a particularly suitable system as they allow gradual changes in composition while avoiding complications from structural modifications. A family of iron(II) cobalt ferrites (CoxFe3–xO4,…
Abstract Lattice constants of the monoclinic form of polyethylene under pressures up to 1.8 GPa at 298 K are investigated by x‐ray diffraction. The thermal expansion from 100 K to 300 K at atmospheric pressure is also studied. The equation of state is calculated by Pastine's method, taking into account the zero‐point…
Improving an experimental technique previously used for smectite synthesis, pure Ni or Mg lizardites, and substituted (Mg-Ni) lizardites, have been synthesized between 25 and 200 °C. At low temperature (25 °C), synthetic clays are very hydrated and poorly crystallized. With increasing time and temperature of experimen…
The mechanism of corrosion of stainless steels in highly concentrated sulfuric acid was studied by the electrochemical method and surface analysis as EPMA and Laser-Raman Spectroscopy. Cyclic potential changes occured in this system about between -0.2V (SCE) (active state) and 0.2V (SCE) (passive state). The anodic re…
The objective of this paper is to review some of the basic properties of polyester adhesives, the types of bonds that can be made with them, and some of their more important end-use applications. In general, these polymers are crystallizable tere phthalate copolyesters containing one or more dibasic acids and one or m…
P 3 Se 4 I is formed by the reaction of molten P 4 Se 3 and I 2 . P 3 Se 4 I is monoclinic, space group P2 1 /c with the lattice parameters of a = 1130.3(3) pm, b = 654.5(2) pm, c =1420.5(4) pm, β - 117.64(2)°. d = 3.87 g cm -3 and d x = 3.82 g cm -3 for Z = 4. The structure of the molecule is derived from the structu…
Quenched phason strains in an Al-Mn-Si icosahedral quasicrystal have been examined by high resolution electron microscopy with particular attention to their orientation relationship with the growth direction of quasicrystal. It is revealed that linear phason strains appear almost perpendicularly to the growth directio…
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Progress in the synthesis and crystal growth of high optical quality KH2PO4 is reviewed. Large crystals have been grown at rates exceeding 15 mm day−1. KH2PO4 has been used to study fundamental crystal growth kinetics and is contributing to the understanding of growth mechanisms. The growth of KH2PO4 has been shown to…
A novel analytical approach to predict eddy current losses in large power transformer walls is proposed. Based upon the knowledge of the incident flux to the rectangular plate, a curve fit to a double Fourier series is obtained. This closed formula representation is used to solve directly Maxwell's diffusion equation…
Repassivation potentials, ER, CREV, for metal/metal-crevices of 54 kinds of stainless steels were measured in 3% NaCl solution at 80°C. Obtained ER, CREV values were analysed in relations to chemical compositions of the 52 steels into multiple linear regressions in the form of Y=b0+∑bjXj for every one of steel groups,…
The investigation of adhesion promoters prepared by the reaction of amino-functional silanes with dianhydrides (or diester-diacid chlorides) of tetracarboxylic aromatic acids is reported. The new coupling agents, designed to exhibit superior thermo-oxidative stability were applied under conditions determined from kine…
Addition of molybdenum compounds to silica-supported platinum catalysts results in an increase of their activity for methanol formation. The location of the promoter has been studied and it is suggested that the molybdenum oxide partly covers the Pt surface. The respective roles of Pt and Mo in methanol formation are…