Materials Literature
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Although InP is widely used in optoelectronic applications, \nlittle is known about the surface chemistry of this important semiconductor. Modification of the InP surface is potentially important as a route to introduce functional groups for the stabilization of InP photoelectrodes,4 to control the surface recombi…
Experimental solubilities are reported for anthracene dissolved in seven binary mixtures containing 2-methoxyethanol with 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-octanol, 2-methyl-1-propanol, and 3-methyl-1-butanol at 25 °C. Results of these measurements are used to test two mathematical representations based…
A computational method, using the Flory−Huggins lattice model, the extended random copolymer theory, and a molecular modeling method to account for the end group effect on the χ interaction parameter and on the value of the temperature where the phase separation of a polymer blend occurs, is proposed. The overall χ in…
The effects of 5% wt BaTiO/sub 3/ additive and of electrode material on space charge formation and electric field distribution in low density polyethylene (LDPE) were investigated using a thermal step technique. Space charge was formed at an average dc field of /spl sim/28 kV/mm and at 50/spl deg/C. Results indicate t…
The crystal structure of Li3SbO4 has been determined by analogy with Na3BiO4, and refined by the Rietveld method using X-ray powder diffraction data. It is monoclinic, space group P2/c, a= 5.1579(2), b= 6.0922(3), c= 5.1397(2)Å, β= 108.839(4)°. The structure is an ordered rocksalt type, with distorted MO6 octahedra.
Description Stabilization and solidification (S/S) technologies have been used for decades as a final treatment step prior to the disposal of radioactive and chemically hazardous wastes. STP 1240 provides you with the latest technical exchange of S/S information available from both of these scientific communities. The…
trans -1,2-Bis(2-pyrrolyl)ethenes (e.g. 18 − 20 ) are prepared by McMurry-type reductive coupling of the corresponding 2-formylpyrroles. The isomeric 1,1-bis(2-pyrrolyl)ethenes (e.g. 24 ) are prepared as a minor byproduct in the reaction of 2-unsubstituted pyrroles (e.g. 22 ) with acetic anhydride under Friedel−Crafts…
This study deals with the changes in the optical properties of polypropylene fibres (4:1 draw ratio 515 tex polypropylene, Bolton, UK) due to the effect of thermal annealing on its structural characteristics. Changes in the structure of annealed polypropylene fibres at a constant time of 2 h and different temperatures…
Total electron-yield (TEY) detection has long been regarded a method for XAS investigations of surface adsorbates under ultra-high vacuum conditions. Recent work has shown, however, that the technique can also be applied to in situ studies of catalysts under reaction conditions. We have thoroughly investigated the TEY…
It has long been recognized that the interphase, i.e., the region between adjacent phases in heterogeneous materials, is a major factor in determining many of the mechanical, optical, and electronic properties of such systems. Interphases are, in general, not abrupt, but exhibit a gradient in the composition from one…
This paper discusses the results on deposition conditions, rates of polymerization, and properties of carbon disulfide films prepared by two techniques, viz., plasma polymerization and argon-plasma-assisted polymerization of carbon disulfide. A higher rate of polymerization and sulfur content was obtained for carbon d…
Microstructures of reaction-bonded Si3N4 bodies, which were fabricated at 1623 K, have been studied to identify the nitridation mechanism of Si compacts by transmission electron microscopy. The percent nitridation of the Si compacts gradually increases with increasing reaction time. In the sample nitrided for 36 ks, t…
Influence of vulcanization conditions (time, pressure and mould thickness) on the electrical conductivity σ- of a 60 FEF/SBR sample was studied. It was found that the mechanism of conduction is highly affected by the different vulcanization conditions. The minimum conductivity value σmin of this compound increases wit…
The microstructure of the rare-earth intermetallic materials, under some circumstances, is very important in determining their extrinsic physical properties. It is demonstrated that some of the microstructural requirements, such as particle size, crystalline integrity, and the phase purity, etc., can be accomplished i…
The prediction of properties of molecules just on the basis of their chemical structures is desirable to selectively make molecules that have the wanted properties, like biological activity, viscosity, or toxicity. Here, we present an example of a new way to predict a property from the chemical structure of a chemical…
Two novel series of electron-beam photoresists possessing high sensitivity and contrast have been developed based on chemical amplification chemistry. The amplification process relies on the electron-beam-induced generation of acids derived from the decomposition of onium salts to catalytically deblock pendant tert -b…
The synthesis and characterization of regioirregular macrocyclics based on the conformationally flexible 1-(4-hydroxyphenyl)-2-(2-methyl-4-hydroxyphenyl)ethane (MBPE) and α,ω-dibromoalkanes, i.e ., MBPE-(c) X ( z ) (where c stands for cyclic, X = 4, 5, 9, and 11 represents the number of methylenic groups in the flexib…
The effect of reaction pressure in catalytic reforming was studied in a pilot reactor with a commercial Pt−Re/Al 2 O 3 reforming catalyst and a hydrotreated naphtha from a North Sea crude. Reformate and hydrogen yields, research octane numbers (RON), and reformate composition at reactor pressures in the range of 12−25…
Main aim of this paper is to present a mathematical model describing the shrinkage phenomenon of materials undergoing drying processes. The model was constructed using the methods of continuum mechanics and the principles of thermodynamics of irreversible processes.it considers the similtaneous deformation of the drie…
Mechanical alloying (MA) was examined by ball-milling the powder mixtures of various starting compositions, Ti-10, 20, 30, 40, 50, 60, 70, 80, 95 at%Mg plus 2 mass%NaCl powder. NaCl powder was an excellent anti-sticking agent for MA. The process of MA was mainly followed by X-ray diffraction and TEM methods. Super-sat…