Materials Literature
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Detailed voltammetric studies are reported of the reduction of alpha-[S(2)Mo(18)O(62)](4)(-) at glassy carbon and platinum macro- and microdisk electrodes (stationary and rotated) in acetonitrile and in 95/5 acetonitrile/water mixtures containing 0.02 M perchloric acid. Experiments at -30 degrees C and at short time s…
Wide-angle X-ray diffraction patterns of single spider-silk fibres of ≤ 5 μm diameter can be obtained at a third-generation synchrotron-radiation source in a few seconds per pattern. This is sufficient to observe the strongest equatorial and first layer line reflections. For higher-resolution structural work, data hav…
Abstract The crystal structures of IrAl 2.75 (“Ir 2 Al 5 ”) and RhAl 2.63 (“Rh 2 Al 5 ”) phases have been studied with single crystal methods: space group P 23, IrAl 2.75 , a = 7.674(1) Å, Z = 8, R F = 0.053 (457 hkl , 29 parameters) and RhAl 2.63 , a = 7.6692(1) Å, R F = 0.042 (684 hkl , 29 parameters). The unit cell…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOn the Landau−Brazovskii Theory for Block Copolymer MeltsI. W. Hamley and V. E. PodneksView Author Information School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K. Cite this: Macromolecules 1997, 30, 12, 3701–3703Publicatio…
The effects of weather conditions such as temperature and pressure on contamination flashover voltage of insulators were investigated theoretically, combining reported empirical relations. The flashover voltage theoretically calculated by the authors were compared with experimental data obtained in various parts of th…
Author: Geiger, C. A. et al.; Genre: Journal Article; Finally published : 1997; Title: Molar volumes of mixing of almandine-pyrope and almandine-spessartine garnets and the crystal chemistry and thermodynamic mixing properties of aluminosilicate garnets
The pretilt angle (Θ p ) of nematic liquid crystals (LCs) could be controlled with alignment layer (AL) polyimides (PIs) and/or LCD processes in the case that a cell gap and a rubbing condition are fixed. Θ p was increased by introducing long, linear alkyl side chains and/or other nonpolar groups to the AL polyimide.…
We study the orientational states induced in nematic liquid crystals by microtextured substrates with a spatially mixed pattern of different aligning potentials on the mesoscopic scale, i.e., on the order of 0.5 \ensuremath{\mu}m or less. We show that within the Landau--de Gennes framework, the existence of a finite e…
The IR and Raman spectra of the monosubstituted hydrosilasesquioxanes RH 7 Si 8 O 12, R = Co(CO) 4, Ph, CH CHPh, and CH 2 CH 2 Ph, have been analyzed by spectral correlation and a normal coordinate analysis. They were treated as a superposition of the spectra of the siloxane cage and the substituent. The molecules PhH…
Molecular dynamics of cascades in pure iron and iron–copper alloys using embedded atom method type of interatomic potentials are presented. Reliable simulations of radiation damage at the atomic scale with high energy Primary Knocked Atoms (PKA) need systems with large numbers of particles and very long computational…
High quality semiconducting boron‐doped polycrystalline diamond thin films were prepared on Si substrates via microwave plasma chemical vapor deposition. The resistivities of the lightly doped films were on the order of 10 2 Ω cm. The photoelectrochemical behavior was studied with excimer lasers of several different w…
Abstract Oxidation of cellulose by chlorine, bromine, hydrogen peroxide and ozone and the functional groups formed are reviewed. The roles of the pH and of the nature of the oxidant in the formation of carboxy‐ and keto‐celluloses are discussed. The relationships between the functional groups, degradation and stabilit…
It is difficult to go through a whole day without coming in contact with something which does not contain a foamed plastic part somewhere within. The most common examples perhaps are the foamed polyurethane seat cushion of the sofa or chair or the car-seat that you sat on this morning, or the polystyrene foam cup in w…
Abstract Commercial FeCl 2 and Fe(II) glycolate, Fe(II) L ‐lactate or Fe(II) L ‐mandelate were used as initiators for the polymerization of L ‐lactide. All polymerizations were conducted in bulk at 150°C, because no conversion was observed in bulk at 120°C. The Fe(II) lactate was found to be more reactive than FeCl 2…
Conducting polymer composites of polyethylene and polypyrrole (PE/PPy), polypropylene and polypyrrole (PP/PPy) and poly(methyl methacrylate) and polypyrrole (PPMA/PPy) were prepared by means of a chemical modification method resulting in a network-like structure of polypyrrole embedded in the insulating polymer matrix…
Anisotropic line broadening in cell-constrained whole-powder-pattern fitting (including the Rietveld method) is proposed to be modelled qualitatively. The object is primarily to improve the fit, with the expectation of an increase in the feasibility of an ab initio structure determination in difficult cases. In a firs…
The heterocyclic anils 2-salicylideneaminobenzothiazole (SABT), 2-salicylideneamino-6-chlorobenzothiazole (SACLBT), and 2-salicylideneamino-6-methoxybenzothiazole (SAMEOBT) were investigated to evaluate their efficiency as corrosion inhibitors for mild steel (MS) in 1 M hydrochloric acid (HCl) at concentrations from 1…
Phase diagrams of thermoreversible gels are derived by the use of two different conventional postgel treatments, i.e., Flory's treatment and Stockmayer's treatment. Phase diagrams by Flory's treatment, which allows cycle formation in the gel network, often show two critical points for intermediate association constant…
In compressed GIS (gas insulated switchgear), the control of wire particle contamination by dielectric coating of enclosure is demonstrated in this paper. Assuming that a particle acquires free charge through a partial discharge, the modeling of particle movement when the inside surface of a horizontal section of GIS/…
Abstract This is a review of PVC technology from chlorine and ethyle, to PVC polymerization, to melt processing, to properties, to recycling and environmental concerns. It is written in terms for understanding by even non‐scientists in the industry. PVC has a large sales volume, second only to polyethylene. Its high c…