Materials Literature
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Boron-rich molecules and solids hold a special place within chemistry. They do not follow the general bonding rules we are taught in chemistry classes. For example, some boron-rich solids are composed of 12-atom clusters of boron atoms in which each boron atom resides on a vertex of an icosahedron. These solids are ve…
Thick, 3–14 mil, free‐standing polypyrrole films incorporating a large variety of anion "dopants" were anodically deposited from aqueous electrolytes. Four‐point probe conductivity and x‐ray diffraction measurements were made and compared. Aromatic and very large amphiphilic sulfonate dopants provided the highest cond…
The renormalization approach to the roughening transition is reconsidered, both in a static and in a dynamic picture. Earlier results based on an asymptotic approximation are corrected, especially as regards the interface mobility. For a tilted interface, or in the presence of an applied force F, a new length scale ap…
Aspartic proteases (EC3.4.23) are a group of proteolytic enzymes of the pepsin family that share the same catalytic apparatus and usually function in acid solutions. This latter aspect limits the function of aspartic proteases to some specific locations in different organisms; thus the occurrence of aspartic proteases…
Revue bibliographique concernant les proprietes physiques, chimiques et moleculaires des emulsions alimentaires, en particulier dans le cas de liqueurs a la creme, de solutions de proteines, de boissons rafraichissantes et autres
We have observed a darkening effect and the formation of permanent volume gratings in CdSSe semiconductor-doped glasses, both phenomena being certainly due to the same photochemical mechanism. This allowed us to reconcile contradictory results concerning the speed of their nonlinear response. We also studied the frequ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice models of branched polymers: combs and brushesJ. E. G. Lipson, D. S. Gaunt, M. K. Wilkinson, and S. G. WhittingtonCite this: Macromolecules 1987, 20, 1, 186–190Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 J…
Polypyrrole incorporating an anionic polymer dopant was used as the anode of a polymer battery utilizing its pseudo-cathodic doping process.
A system close to a bulk phase transition presents peculiar response to external boundaries, a single wall may induce the presence of wetting layers, with the appearance of a surface phase transition and critical point. The confinement of the system between the two parallel walls or cylindrical tube, produces a shift…
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…