Materials Literature
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ABSTRACT Acetic acid solutions (0.5, 1.0 and 3.0%) were packed in polyethylene aluminum foil laminated material and adhesion between the layers was measured during 28‐days storage at room temperature (∼23°C). Peel tests showed that in 3% acetic acid adhesion between layers was almost totally lacking after 4 days. Afte…
This paper describes the application of ab initio molecular orbital (MO) theories in conjunction with reaction rate theory to obtain thermochemistry and energetics of nucleation processes. The specific example used for the illustration of this approach is the nucleation of SiO. MO computations on the equilibrium struc…
Abstract Zinc solubility in clay and soil suspensions was controlled by chemisorption at pH 4.5 – 7.0. The solubility in clay mineral suspensions was in the order palygorskite < montmorillonite « kaolinite and reflected the high affinity of zinc to palygorskite and the high CEC of montmorillonite. The solubility in…
The oxidation of primary aromatic amines to the corresponding nitro derivatives has been observed in catalytic systems (turnovers/hour up to 18000) containing tert-butyl hydroperoxide and metallo-tetraaryl porphyrins (metal = FeIII or MnIII) in the presence of heterocyclic nitrogen bases acting as axial ligands.
In this paper we report the synthesis and the structural, thermal, electrical properties of 1-D polymeric chlorocadmates(II), having N-methylpropane-1,3-diammonium (mepnH2) andlV^Vdiethylpropane-1,3-diammonium (et2pnH2) as countercations.The (mepnH2)2[Cd3Cli0] crys- tallizes in space group P2i/c.The unit cell dimensio…
Particulates of atmospheric interest, including soot, oxidized soot, and oxides of transition metals, “fellow travelers” in the combustion of solid or liquid fossil fuels, have been examined for their influence on the heterogeneous oxidation of S(IV) to S(VI), both with and without the presence of simulated solar radi…
The material (R)-1-methylheptyl 4-(4′-n-dodecyloxybiphenyl-4-ylcarbonyloxy)-3-fluorobenzoate has been prepared and its liquid-crystalline properties investigated. This material was selected for synthesis because it was expected to exhibit a ferroelectric smectic C* phase with a large value for its spontaneous polariza…
The interaction of AlMe3 with the polydialkylsiloxanes (OSiRMe)x and (OSiPh2)3 for long periods at elevated temperatures leads to the rupture of the silicon–oxygen framework and yields dimeric dimethylaluminium siloxides [Me2Al(OSiMe2R)]2, R = Me (1), n-C6H13(2), n-C8H17(3), n-C14H29(4), n-C18H37(5), -CH2CH2CF3(6), Ph…
Abstract On the basis of sterical and electrostatical arguments, it is deduced that the stoichiometry of Na + ‐ and CO 3 2‐ ‐containing calciumhydroxyapatite can be accounted for by 6 substitution mechanisms magnified image where V x stands for a vacancy in the X‐sublattice. It is shown that every mechanism proposed i…
Expressions to describe the initial collection efficiency of electret filters for both charged and neutral particles were derived covering a wide range of Coulombic force and induced force parameters including the interceptional effect. The prediction equations were in good agreement with the experimental data. Furthe…
The binary lyotropic liquid crystalline system caesium pentadecafluoro-octanoate (CsPFO)/water (2H2O) exhibits an isotropic micellar phase, a lyotropic nematic phase and a positionally ordered, lamellar phase whose planes contain substantial water filled defects. It has been suggested that the structural unit in all t…
A simple and accurate method for determination of filler material density is described. Rice husk ash (RHA) which consists predominantly of silica serves as a filler in polypropylene. The filler density was determined from first principles using a pyknometer. The filler was compounded in polypropylene and the densitie…
A palladium-catalysed stannole synthesis is described and its mechanism elucidated by the synthesis of several conceivable intermediates, which have been fully characterized (NMR, X-ray structure analyses).
A review is presented of microhardness tests applicable to plastics. The methods are outlined and the effect of test variables considered. Published literature describing applications of microhardness measurements to plastics including structure and environmental resistance are reviewed.
A series of [3]- and [4]-dendralenes, functionalised with 1,3-dithiole groups, are synthesised and shown by cyclic voltammetry to undergo reversible multi-stage redox reactions to yield tri- and tetra-cation species, respectively; the X-ray crystal structure of a [3]-dendralene derivative is reported.
Abstract A formula to compute total elastic Mott cross‐sections as well as a tabulation of the constants to compute total Mott cross‐sections for 94 elements are presented herein. This formula and the constants have been obtained from the values of total elastic Mott cross‐sections computed by Czyżewski et al. (1990)…
The use of the typical ABC equivalent circuit for one cavity in solid dielectrics for internal partial discharge modelling has been common practice for many years. The introduction of an equivalent circuit for two closely coupled cavities permits the investigation of the interaction between discharges in such cavities…
Upon doping with C60–C70(75 : 25 by mole) or by C60(>99%) in N-methylpyrrolidin-2-one–toluene solution at room temperature, conductivities of the emeraldine base of polyaniline as free-standing solution-cast films were found to increase significantly toca. 10–4 S cm–1 at a fullerene content of ca. 1 mol%.
A new test for estimating the adhesion of paints to metal substrates is presented. Small painted disks are immersed in N-methyl pyrrolidone (NMP) at 60°C and the time for the paint film to dclaminate completely and intact from the substrate is recorded. This time, termed the NMP paint retention time or NMPRT, is shown…
A series of aroylhydrazinato-nickel(II) and -copper(II) complexes have been synthesised in high yield and shown to form a new class of metallomesogens, which form smectic C and nematic phases; the nickel(II) complexes were found to be highly stable even in the isotropic phase, which contrasted with the rapid decomposi…