Materials Literature
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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…
This paper presents a theoretical examination of a nematic cell bounded by bistable weakly anchored surfaces. Switching between the two resultant equilibrium states is achieved by means of an electric field. In setting up the problem we identify a parameter whose measurement is important to the development of any devi…
We propose a mechanism by which energy transfer by phonons between two solids may be modified by interface irregularity, so-called scattering-mediated transmission. The interface region is modeled as a thin layer of varying thickness sandwiched between irregular boundaries, having density and elastic constants differe…
Iron-nickel-chromium based heat resistant alloys are designed to operate at high temperatures in corrosive gaseous environments. Under mixed oxidizing-carburizing conditions, the microstructure of such materials changes progressively during service and the physical and mechanical properties are altered. One instance w…
This work aims to understand the mechanism of the thermal degradation of the ethylene–carbon monoxide (E-CO) alternating copolymer under mild conditions. The copolymer was subjected to accelerated ageing in an oven at different temperatures below the copolymer melting point, under argon atmosphere, and in the absence…
Abstract Copolyesters build of aliphatic and aromatic components have been shown to be degraded by microorganisms in a certain range of composition. While aliphatic polyesters of diol and dicarbonic acid often are hydrolyzed e.g. by lipases, pure aromatic polyesters like polyethylene terephthalate are not biodegradabl…
The triply differential cross section for Compton scattering from atomic electrons is obtained numerically in a full relativistic second-order $S$-matrix calculation based on the independent particle approximation. We compare our results with the results of more approximate approaches. Special attention is paid to the…
As a step toward creating a chemical vapor deposition (CVD) process for PbTiO 3 thin films, lead oxide films were deposited and then examined. The reaction was oxidation controlled, with an apparent activation energy of 97 kJ/mol in this low‐temperature, low‐pressure metalorganic CVD (MOCVD) process. Across the deposi…
The dissolution of three synthetic allophanes (A2.0, molar ratio Al/Si = 2.02; A1.6, Al/Si = 1.64, and A1.3, Al/Si = 1.26) and two natural Japanese allophanes (KNP, Al/Si = 1.74 and KYP, Al/Si = 1.70) in the presence of boehmite was studied in 0.01 M NaCl (initial pH 3) at 100-150° C and equilibrium vapor pressures fo…