Materials Literature
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The mesogenic 4,4′-bis[4-(n-octyloxy)benzoyloxy]azobenzene (HL) ligand reacts with [(PhCN)2PdCl2] to give the dinuclear cyclometalated complex [(μ-Cl)(L)Pd]2 (1), from which the mononuclear half-sandwich [(η5-C5H5)(L)Pd] (2) species has been obtained by reaction with Tl(C5H5). The PtII analogue of 2, [(η5-C5H5)(L)Pt]…
The room‐temperature tensile strengths of chemically‐vapor‐deposited SCS‐6 silicon carbide fibers were measured after 1 to 400 h heat treatments in 0.1 MPa of argon at temperatures up to 2100°C. The fibers heat‐treated for 1 h above 1400°C and those heat‐treated for 400 h above 1300°C showed strength degradation. Scan…
A series of Mo/TiO2 catalysts was prepared by equilibrium adsorption from aqueous solutions of (NH4)6Mo7O24 by varying the pH of the solution from 9.8 to 4. The Mo loading increases from 0.8 to 3.6 wt.% as the pH of preparation decreases. The surface coverage of the calcined catalysts was monitored by CO2 chemisorptio…
Barium titanate ceramic samples of four different average grain sizes from 0.5 µm to 20 µm were studied by means of the ac calorimetric method. The ferroelectric-to-paraelectric transition temperature decreased with decreasing grain size. The temperature dependence of heat capacity showed hysteresis during a heating/c…
Several charge-transfer (CT) complexes derived from 1,5-diphenyl-3-(p-substituted-phenyl)- verdazyl radicals and TCNQF 4 (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) or DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) were prepared and their magnetic properties were investigated. The X-ray crystal structural…
Abstract A computer‐based method is described for the determination of the interfacial tension between pendant and sessile drops in a surrounding continuous phase. This has been used to determine the effect on interfacial tension of increasing amounts of aliphatic alcohols, from methanol up to n‐octanol, equilibrated…
The crystal structure and thermal displacement parameters of potassium hexachloroplatinate, K 2 PtCl 6 , have been studied as functions of temperature between 8 and 380 K, using four single crystal neutron diffraction, five single crystal X-ray diffraction and two neutron powder diffraction data sets. Third-order anha…
Low cycle fatigue properties of zirconium and zircaloy-4 were investigated at RT and 400°C. The microscopic structure was determined using scanning electron microscopy and transmission electron microscopy techniques. On the basis of analyses of fatigue damage mechanism, it is believed that fatigue is an irreversible e…
Abstract An indolyfulgide has been trapped in a hybrid organic-inorganic matrix prepared by the sol-gel process using methyltriethoxysilane. Photochromic properties of doped films have been studied.
A phenomenological theory is developed for uniaxial and biaxial nematic phases, based on a two component tensor order parameter. Phase diagrams are plotted and investigated in the plane of two thermodynamic parameters. Anomalies in thermal properties are studied in the vicinity of an isolated four-phase critical point…
An algorithm was developed in which galvanostatic regulation of electrochemical impedance measurements is conducted with an amplitude of current perturbation that is adjusted at each frequency to yield a desired variation in potential. Measurements of three previous frequencies are used to estimate the value of the im…
Chromium based ODS alloys are being discussed as interconnector materials in solid oxide fuel cells (SOFC's). One of the major requirements for the interconnect material is sufficient corrosion resistance in the anode and cathode side gases at the operating temperature of around 950°C. In the present study the corrosi…
The in vitro antiproliferative activity and in vivo phototoxicity of some methyl derivatives of 5-methoxypsoralen and 5-methoxyangelicin, i.e. 4,4'-dimethyl-5-methoxyangelicin (compound I), 3,4'-dimethyl-5-methoxyangelicin (compound II), 4,4'-dimethyl-5-methoxypsoralen (compound III); and 3,4'-dimethyl-5-methoxypsoral…
The effect of carburisation on the ductility in terms of Charpy V-notch impact energy of five nickel-base alloys (alloy 45-TM, alloy 600H, alloy 617, alloy 601 and alloy 602CA) and three iron-nickel-chromium alloys (alloy 800H, alloy AC66, alloy DS) with different concentrations of aluminium, chromium and silicon was…
High speed steel is a very difficult materialfor shape casting owing to the formation of eutectic carbide networks during its solidification. These networks cause the steel to be brittle which is detrimental to the mechanical properties of tools manufactured from the material. In the present research, the effect of re…
The synthesis of a series of new high-barrier poly(hydroxy amide ethers) is described. The polymers are formed by the reactions of Bisphenol A diglycidyl with a series of N, N ‘-alkylenebis(4-hydroxybenzamides) of general formula HOC 6 H 4 CONHRNHCOC 6 H 4 OH [R = −(CH 2 ) 2 - 6 −, −CH 2 CH(OH)CH 2 −, −CH 2 C 6 H 4 CH…
The theoretical model of grain-boundary sliding (GBS) stimulated by intragranular dislocation slip has been suggested on the basic of experiments on Zn and Cd bicrystals. Lattice dislocations of two grains dissociate in boundary during the spreading time t s and form two families of mobile gain-boundary dislocations (…
Carbon-coated cobalt nanocrystals were prepared by a modified method of arc discharge under a He gas blow around a graphite rod cathode. The morphology and structure of the carbon coating and the cobalt enclosure were examined by high-resolution transmission electron microscopy, Raman scattering, and X-ray diffraction…
Abstract Hydrothermal treatment of aqueous mixtures of sodium hydroxide, copper chloride and excess sodium silicate (Si/Cu ≥ 2) at 150 °C produced blue powders. Scanning electron microscopy/energy dispersive X-ray (SEM/EDX) analysis of the products show they all had similar chemical compositions, with Si/Cu ratios of…
14N nuclear magnetic resonance (NMR) measurements have been carried out for three members of 4'-n-alkoxy-3'-nitrobiphenyl-4-carboxylic acids (ANBC-n, where the number of carbon atoms in the alkoxy group, n, is 14, 16, and 22) in the temperature range 400-500 K. ANBC-16 and-22 show an optically isotropic D phase. The 1…