Materials Literature
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High molecular weight, free-standing films of poly(2,5-thienylene vinylene) are readily prepared via a soluble precursor polymer and reach conductivities as high as 62 S cm–1 on doping.
We present a detailed study of the electrochromic switching phenomena in the novel conducting polymer, polyisothianaphthene. We find reversible electrochromic switching with a characteristic switching time of a few hundred milliseconds. Since the results indicate that the rate limiting step in the electrochromic switc…
X-ray attenuation coefficient measurements made on single-crystal silicon specimens by participants in the International Union of Crystallography Attenuation Project are presented for the energy range 8-60 ke V. Twelve laboratories using eight different experimental configurations have provided data for analysis. A co…
A review of the results of recent neutron diffraction, coherent diffuse and inelastic scattering experiments on UO2 and ThO2 at temperatures between 293 K and 2930 K is given. These provide direct evidence for thermally induced Frenkel oxygen lattice disorder at temperatures > 2000 K and give data on the lattice expan…
Reflectance spectra of near normal incidence and/or transmittance spectra of 29 materials were acquired in the ultraviolet, visible, and infrared spectra regions. Optical constants of the materials were determined primarily by use of Kramers-Kronig analysis of reflectance or extinction coefficient spectra. The materia…
The deposition of CaCO3 by algae (calcification) is a widespread phenomenon and the deposits of either aragonite or calcite may be extra‐, inter‐, or intracellular. This variability in location and crystal isomorph suggests that different calcification mechanisms operate in different algal groups. Despite this differe…
Conducting polypyrrole particles in the size range 50–250 nm diameter have been prepared by a dispersion polymerisation route in aqueous media using FeIIICl3 as the initiator–dopant.
Surface Phenomenon Thin Liquid Films Conventional Foams Colloidal Gas Aphrons Oils Spread on Water Biliquid Foams Polyaphrons Applications of Bubbles Applications of CGA Applications of Polyaphrons Invert Aphrons Unusual Forms of Aphrons Biological Implications Cancer Paining on Water.
Abstract Fouling and/or scaling of heat transfer surfaces causes serious problems in industry. Prevention of fouling is therefore essential for technical (considerable deterioration of heat transfer) and also economic reasons (increased costs). In order to provide successful countermeasures, it is, however, necessary…
Particles on surfaces containing microelectronic circuits interfere with the circuit operation thus reducing product yield. Adhesion of particles to such surface as well as to other surfaces in production environments needs to be understood so that effective ways for preventing deposition and cleaning contaminated sur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis of liquid-crystalline polyacrylates with laterally substituted mesogensQi Feng Zhou, Hui Min Li, and Xin De FengCite this: Macromolecules 1987, 20, 1, 233–234Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 Janua…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOzone decomposition in water: kinetic studyJose L. Sotelo, Fernando J. Beltran, F. Javier Benitez, and Jesus Beltran-HerediaCite this: Ind. Eng. Chem. Res. 1987, 26, 1, 39–43Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published iniss…
Phase separation in a binary mixture is described by the nonlinear evolutionary Cahn-Hilliard equation. In this paper, we discuss the physical background of the equation and describe its solution by the Galerkin finite element method. Some theoretical results are presented and computationally verified.
Atomic diffusion processes in UO2 and in the fast-breeder reactor fuel, (U, Pu)O2 are reviewed. Emphasis is given to the slower-moving species. i.e. U and Pu. Self-diffusion, chemical diffusion, diffusion in a thermal gradient, enhancement of diffusion by radiation and fission and the operative diffusion mechanisms ar…
Principles and procedures of diffraction data processing are described. Reflection integration limits are obtained from a least squares analysis of peak profile widths, based on the principles of convolution synthesis of peak profiles. An approximate, empirical thermal diffuse scattering correction is obtained from a…
There is now evidence that collagen turnover in normal tissues can occur at rapid rates. In skin of adult rats, the mean rate lies between 3 and 5%/day, but rates of greater than 10%/day have been reported in some tissues, such as lung and periodontal ligament. The major sites of this degradation are still uncertain.…
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Abstract: Sequence stratigraphic concepts are powerful tools in the analysis of the evolutionary history of sedimentary basins. The criteria used in the identification of depositional sequences differ for outcrop and subsurface data sets because of scale differences in stratal continuity and spatial resolution. This p…
Graphite in various forms has become the standard target for accelerator 14 C dating. Graphite has been made by catalytic graphitization of charcoals (Lowe, 1984). Thin films of graphite have also been produced by thermal cracking (Beukens & Lee, 1981), electric discharge (Andrée et al , 1984; Wand, Gillespie &…
Article de synthese sur les recents developpements dans le domaine: les conducteurs a ion rapide, les mecanismes de la conductivite ionique, l'effet de l'ion mobile mixte et les effets de relaxation. On etudie l'influence de la structure, de la temperature et de la composition sur ces differentes proprietes