Materials Literature
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Temperature dependence of piezoelectric properties was measured for a tetragonal and a rhombohedral Pb(Zr, Ti)O 3 (denoted as t -PZT and r -PZT, respectively). A least squares fitting of complex admittance data was employed in order to precisely determine various electromechanical constants. It was confirmed that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroless metalization of halloysite, a hollow cylindrical 1:1 aluminosilicate of submicron diameterSubhash Baral, Susan Brandow, and Bruce P. GaberCite this: Chem. Mater. 1993, 5, 9, 1227–1232Publication Date (Print):September 1, 1993Publication History Published online1…
The series of reagents, pyrophosphate, oxalate, and dithionite have been applied sequentially in the characterisation of a group of podzolic soils and the cumulative amount of iron (Fe), aluminium (Al), and silicon (Si) extracted has been compared with the amounts removed when the reagents are used separately on diffe…
The Electron Paramagnetic Resonance (EPR) technique is described as a valuable tool in order to probe the spin correlations in π-radical magnets. The peculiar features of the EPR response of low dimensional exchange coupled spin systems are recalled. The extreme sensitivity of the resonance field to both magnetic and…
Abstract Simultaneous IPNs of poly(dimethyl siloxane‐urethane) (PDMSU)/poly(methyl methacrylate) (PMMA) and related isomers have been prepared by using new oligomers of bis(β‐hydroxyethoxymethyl)poly(dimethyl siloxane)s (PDMS diols) and new crosslinkers biuret triisocyanate (BTI) and tris(β‐hydroxylethoxymethyl dimeth…
Abstract Silica-indurated subsurface horizons of an in situ lateritic profile in semi-arid western Australia were investigated using a range of electron-optical and X-ray diffraction (XRD) techniques. These indurated materials were compared with underlying non-indurated pallid zone material. The secondary silica conte…
Copper (Cu) phytotoxicity is closely related to pH and Cu activity in solution. The effect of pH on growth and uptake of Cu by Swingle citrumelo rootstock seedlings were investigated in solution culture with varying Cu activities. Copper activities of either 0.05, 0.5, 5, and 10 μM at pH 5 and 6 were maintained by add…
Electrochemical techniques, ellipsometry and x‐ray photoelectron spectroscopy were used to evaluate the use of benzotriazole, alone or in combination with boric acid/borate buffer and dilute copper sulfate for the protection of cobalt. The data indicate that in slightly alkaline solutions benzotriazole is a strong inh…
A recursive integral equation for the intramolecular correlation function of an isolated linear polymer of N bonds is derived from the integral equations presented in the preceding paper. The derivation basically involves limiting the density of the polymer to zero so that polymers do not interact with each other, and…
A study was conducted of the temperature dependence of the thermal diffusivity and thermal expansion of an alumina–aluminum titanate composite heated to a range of maximum temperatures followed by cooling to room temperature. Heating to temperatures above about 600°C resulted in a hysteresis behavior in which the data…
Abstract The hydrosilation of α,ω‐dihydrogen functional oligopolydimethylsiloxanes with epoxy compounds containing vinyl groups has been found to take place regioselectively in such a manner that compounds can be isolated in high yields in which only one SiH group has been reacted. Three different α,ω‐dihydrogen func…
The mesomorphic properties of 3,4,10,11,17,18,24,25-octaalkyloxy and octaalkanoyloxycyclotetraveratrylene (orthocyclophane) have been investigated by differential scanning calorimetry (DSC), polarizing optical microscopy, NMR and X-ray diffraction. Twelve homologues of the octaalkyloxy series, with equal side chains c…
Cellulose colonization by Clostridium cellulolyticum was studied by using [methyl-H]thymidine incorporation. The colonization process indicated that a part of the bacterial population was released from cellulose to the liquid phase before binding and colonizing another adhesion site of the cellulose. We postulate that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe apparent "dual emitter" characteristics of iridium bipyridine phenanthroline complexes, [Ir(bpy)x(phen)3-x]3+ for x = 1,2Elmars Krausz, John Higgins, and Hans RiesenCite this: Inorg. Chem. 1993, 32, 19, 4053–4056Publication Date (Print):September 1, 1993Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkanesulfonation of cyclic and high polymeric phosphazenesHarry R. Allcock, Erick H. Klingenberg, and Mark F. WelkerCite this: Macromolecules 1993, 26, 20, 5512–5519Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 S…
Cell-free extracts of Thiobacillus acidophilus catalysed the stoichiometric conversion of tetrathionate to thiosulphate, sulphur and two protons. The pH optimum of the enzyme activity was 3.0 and its temperature optimum 40°C. The enzyme was unstable at 30 and 40°C, at which its activity decreased to zero within 100 an…
Abstract Generally, fracture toughness and fracture stress of ceramics depend on crack length, notch root radius and grain size. These three parameters are most important when assessing the integrity of structural ceramic members and developing high‐performance ceramics. A new failure criterion called the process zone…
SUMMARY: Accumulation of Cs+ by Chlorella salina was 28-fold greater in cells incubated in the presence than in the absence of 0.5 M-NaCl. An approximate 70% removal of external Cs+ resulted after 15 h incubation of cells with 50 μ;M-CsCl and 0.5 M-NaCl. LiCl also had a stimulatory effect on Cs+ uptake, although manni…
Castor oil is a relatively inexpensive and renewable source of hydroxyl groups. This makes use of castor oil in polyols for polyurethane very attractive. We have prepared a simple castor oil based polyol for rigid polyurethane foam application. The polyol is a physical blend of castor oil and glycerol. Glycerol acts a…
Abstract Measurements on polyaniline using dielectric analysis (DEA, −50°C to 240°C, 0,4 Hz to 10 5 Hz), differential scanning calorimetry (DSC, 30°C to 240°C) and infrared spectroscopy (IR) after heat treatment from 25°C to 300°C are carried out. After conversion of DEA results to complex electric modulus, the conduc…