Control of the lipophilicity of polypyrrole by 3-alkyl substitution
3-Alkyl substitution of the polypyrrole monomer leads to highly conductive and electroactive polymers and permits control, to a large extent, of their hydrophobic character.
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Faceted Dendrites in the Growth of NH 4 Br Crystals
The growth of crystals of NH 4 Br from a supersaturated solution is studied. We find regimes where crystals grow in form of “faceted dendrites”, i.e. with a global parabolic shape and facets close to the tip. A power law is found for the decrease of the size of the facets with velocity. We further study the evolution…
Effect of form of the surface reactivity of differently prepared zinc oxides
The relationships between the from of crystallites and their adsorption properties have been investigated on ZnO samples of various origins by means of electron microscopy, X-ray diffraction and adsorption calorimetry. Three polycrystalline ZnO samples have been studied: one obtained by ignition of zinc metal (Kadox)…
Improved adhesion of poly(tetrafluoroethylene) by NH3-plasma treatment
—Surface modification of poly(tetrafluor oethylene) (PTFE) by NH3-plasma treatment was investigated by means of contact angle measurement, XPS, and ATR FT/IR spectroscopy. The modified surfaces were adhesively bonded to nitril rubber. The NH3-plasma irradiation made PTFE surfaces hydrophilic. The contact angle of wate…
Steric effects on the optical and electrochemical properties of N-substituted pyrrole–thiophene monomers and polymers
Monomers consisting of N-alkyl-substituted-2,5-bis(2-thienyl)pyrroles and thier electro-oxidatively generated polymers display electrochemical and optical properties which reflect the steric demands of the alkyl substituents.
Surface area evolution of calcium hydroxide during calcination and sintering
Abstract A simple one‐dimensional mathematical model validated with high‐temperature entrained‐flow reactor data successfully explained dispersed calcium hydroxide particle surface area evolution resulting from concomitant calcination and sintering. An integrated first‐order calcination rate expression and a second‐or…
Potential dependence of the relative conductivity of poly(3-methylthiophene): electrochemical reduction in acetonitrile and liquid ammonia
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential dependence of the relative conductivity of poly(3-methylthiophene): electrochemical reduction in acetonitrile and liquid ammoniaRichard M. Crooks, Oliver M. R. Chyan, and Mark S. WrightonCite this: Chem. Mater. 1989, 1, 1, 2–4Publication Date (Print):January 1, 198…
Lattice-engineered micromodulation of intramolecular electron-transfer rates in trinuclear mixed-valence iron acetate complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice-engineered micromodulation of intramolecular electron-transfer rates in trinuclear mixed-valence iron acetate complexesHo G. Jang, Steven J. Geib, Yuki Kaneko, Motohiro Nakano, Michio Sorai, Arnold L. Rheingold, Bernard Montez, and David N. HendricksonCite this: J. A…
Field-enhancing defects in polymeric insulators causing dielectric aging
Defects that produce strong local field enhancement are discussed. They are especially harmful because they do not produce partial discharges detectable in usual factory control tests. Typical examples for such defects are electrode protrusions, floating conducting particles, and the tips of electrical trees. Charge i…
Photochemistry of colloidal semiconductors 29. Fractionation of CdS sols of small particles by exclusion chromatography
Abstract CdS sols stabilized by sodium hexametaphosphate or poly‐phosphate‐15 were fractionated in a column of sephacryl gel and the fractions investigated by electron microscopy and spectrophotometrically. A linear relationship between the logarithm of the particle size and the elution time was observed. The method m…
Principles and Techniques of Quantitative Analysis of Clay Minerals by X-Ray Powder Diffraction
Abstract Quantitative analysis by X-ray powder diffraction (XRD) pro-edures is difficult even for simple, well-characterized solid phases. The intrinsic chemical variability of minerals adds a measure of uncertainty to results, and sample-to-sample variations in preferred orientation, commonly encountered with micas a…
Interfacing the finite-element method with the method of characteristics in self-consistent electrostatic field models
Two methods are described for interfacing the finite-element method, used to calculate the electric field structure for a known charge distribution, with the method of characteristics, used to calculate the charge distribution for a known electric field structure, so as to obtain self-consistent descriptions of electr…
Invited Lecture. Complexities in the structure of ferroelectric liquid crystal cells The chevron structure and twisted states
To demonstrate the generality of the chevron structure in ferroelectric liquid crystal (FLC) cells, an optical micrograph is presented, which shows a series of defect lines clearly indicating this structure. The generality is understood as a direct manifestation of the smectic layer undulation playing an important rol…
Crystal Structure Analysis of ω-Amino Acid: Pyruvate Aminotransferase with a Newly Developed Weissenberg Camera and an Imaging Plate Using Synchrotron Radiation1
The three-dimensional structure of omega-amino acid:pyruvate aminotransferase from Pseudomonas sp. F-126, an isologous alpha 4 tetramer containing pyridoxal 5'-phosphate (PLP) as a cofactor, has been determined at 2.0 A resolution. The diffraction data were collected with a newly developed Weissenberg camera with a Fu…
A comparative study of the behaviour of single-crystal surfaces and supported catalysts in NO reduction and CO oxidation over Pt–Rh alloys
The use of Pt–Rh-based three-way catalysts for automotive exhaust-gas control stimulated us to study various Pt–Rh alloy surfaces: well defined single-crystal surfaces and SiO2-supported catalysts. For the sake of comparison data were also obtained for pure Pt and Rh single-crystal surfaces and catalysts. The surface…
Evaluation of RTV coating for station insulators subjected to coastal contamination
Measurements and analysis of contaminant samples from a nuclear power station which has suffered flashovers due to wind-swept salt spray are presented. The results of a program of laboratory tests on artificially contaminated porcelain station insulators, with and without a room temperature vulcanized (RTV) silicone r…
The electronic structure of heteroaromatic molecules. Part 3. A comparison of benzene, borazine, and boroxine
Spin-coupled theory has been applied to the π electrons of the heteroaromatic molecules borazine and boroxine. Benzene is also reconsidered with more elaborate calculations than were used in previous work. The spin-coupled description of benzene, with semi-localized orbitals, is the same as that found previously. The…
Film-induced cleavage of alpha-brass
A comprehensive investigation was carried out to explore the micro-mechanisms associated with the evolution of deformation microstructure and texture in Ni-Fe alloys during rolling. X-ray diffraction, electron back-scatter diffraction (EBSD) and Mössbauer spectroscopy as well as simulation methods involving crystal pl…
Highly ordered monolayer assemblies of phthalocyanine derivatives
Monolayer assemblies of several phthalocyanine derivatives, e.g. copper tetrakis(n-butoxycarbonyl)phthalocyanine, showing highly anisotropic absorption spectra have been obtained.
Structure and properties of porous hypercrosslinked polystyrene sorbents Styrosorb
Abstract