Materials Literature
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Highly reactive and ultra-fine barium polytitanates (BaO-nTiO2, n= 4, 4.5, 5) with a particle size of 30–50 nm have been prepared by the citrate route. Solubility isotherms were calculated for the BaCO3-citric acid-H2O and TiO(OH)2-citric acid-H2O2-H2O systems at 25 °C to predict the optimum pH condition for preparing…
Novel 2,3,6,7,9,10-hexasubstituted phenanthrene derivatives have been synthesized, which showed broad enantiotropic columnar phases. A mixture of one representative bearing six (S)-2-methyl-3-oxa-decanoyloxy side chains with its 1,2,3,6,7,8-hexasubstituted structural isomer showed a tilted columnar phase and exhibited…
The optical and electrical conductivity behaviour of phases in the systems CsMIIX3(MII= Ge, Sn, Pb; X = Cl, Br, I) are explained by donation of electron density from non-bonding electron pairs on the MII metal into a conduction band formed by the overlap of halogen d states. The greater ionic character of the PbII red…
Some new photoresponsive azobenzenes (1–5) have been synthesized and characterized. On irradiation at 330 nm these systems undergo conversion from the E to the Z form to a varying extent which depends upon the nature and position of substitution on the azobenzene rings. They revert back to the E form on thermal isomer…
Ca4Y6(SiO4)6O:A (A = Pb2+, Eu3+, Tb3+, Dy3+) phosphors have been prepared by two methods: the sol-gel method and the conventional dry method. The crystallization processes and the luminescence characteristics of the phosphors were studied. The sol-gel method features low-temperature formation of the phosphor, leading…
Aims and Scope
Abstract Ultisols and Oxisols in Malaysia are characterized by low pH and high Al, with their subsoils usually deficient in Ca, Mg, or both. An experiment, using polyvinyl chloride columns, was conducted to study chemical reactions in a representative Ultisol and Oxisol from Malaysia resulting from application of grou…
The acidic sites in Cu/ZSM-5 catalysts active for the reduction of nitrogen oxides under lean conditions have been investigated by examination of the IR spectrum of adsorbed pyridine: proton and sodium forms of the zeolite have also been studied to provide reference results. As expected, H-ZSM-5 exhibited both Lewis a…
Novel, neutral EuIII, GdIII and YbIII complexes have been obtained with tetraaza-macrocyclic ligands containing three phosphinate and one carboxamide co-ordinating arms. The overall results are consistent with a co-ordination geometry based on the octadenticity of these ligands. Among the possible 16 enantiomeric pair…
Differential scanning calorimetry (DSC) curves of levofloxacin hemihydrate measured under various conditions showed different thermograms. These phenomena were attributed to be the dehydration. Dehydration caused a multiple-phase transition. Dehydration at a higher temperature (above 70°C) gave a sharp endothermic pea…
Our goal is to establish the applicability of artificial neural networks to the prediction of physical and mechanical polymer properties from their monomer structures alone. We demonstrate their ability to predict, quickly and accurately, the glass-transition temperatures (Tg) of linear homopolymers. A variety of mult…
New 4′-alkyl-substituted 2,2′:6′,2″-terpyridine (4′R-terpy) compounds have been synthesised from 4′-methyl-2,2′:6′,2″-terpyridine and an appropriate 1-bromoalkane and complexed with ruthenium and rhodium to yield new bis(terpyridine) complexes [Ru(terpy)(4′R-terpy)]2+(R = C19H39 or C31H63) and [Rh(terpy)(4′R-terpy)]3+…
A model for the solidification of multicomponent steels is presented and used to simulate the solidification of an austenitic steel. Assuming stationary solid phases, conservation of multiple species is considered simultaneously with the solution of the energy and Navier-Stokes equations, with full coupling of the tem…
The synthesis process and the formation mechanism of Al4SiC4 were investigated using Al, Si, and C as starting materials. Properties such as hydration resistance of the synthesized Al4SiC4 were examined. SiC and Al4C3 begin to form from about 800°C and 900°C, respectively. When the temperature is above 1300°C, both pr…
Frequent phase identifications of a large number of zinc panels exposed to different atmospheric conditions, both in national an international exposure programs, have revealed a variety of corrosion products. In order to extract basic information about the atmospheric corrosion processes involved, emphasis has been pl…
Description This comprehensive publication presents 16 international papers on atmospheric corrosion and corrosion testing. Provides an understanding of atmospheric corrosion concerns from the standpoint of economics, safety, and aesthetics, and what is being done about them on four continents. Topics include: • Corro…
Abstract Vh‐type crystals were prepared by precipitation in pure alcohol of amylose solutions in dimethyl sulfoxide (DMSO). The respective influences of amylose chain length and final equilibrium relative humidity (E.R.H.) on the nature of transitions induced by moisture exchanges were studied extensively using X‐ray…
Abstract The recent growth in the post‐consumer recycling of plastics presents an opportunity for developing new, value‐added blend products from the recycled polymers. However, in order to develop blends with useful performance characteristics, suitable techniques of compatibilization and impact modification must be…
Hybrid organic–inorganic nanocomposites made of metal oxo-polymers (zirconium and neodymium oxo or dysprosium oxo species) linked to siloxane species [(CH3)Si–Oz.frac32;] exhibit luminescence. At low rare-earth-metal (M = Dy, Nd) concentrations, the emission lifetime is mainly governed by energy-transfer processes bet…
Doubt is cast in this article on the universality of the conclusion that linear bi-isotropic media have to be reciprocal, which claim has recently been set forth by Lakhtakia and Weiglhofer (see ibid., vol. 42, no. 9, p. 1715-6, 1994).>