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Synthese anodique et comportement electrochimique de polyfluorenes disubstitues sur l'atome de carbone n o 9. Dopage reversible n ou p sans destruction du materiau. Mise en evidence d'une charge remanente (positive ou negative) dans la matrice polymerique et conditions d'obtention de la neutralisation plus ou moins to…
Hornreich et al. predicted that blue phases I, II, or III should undergo structural transformations into anisotropic uniaxial blue phases in electric or magnetic fields. It is shown here that, besides a hexagonal blue phase BP ${H}^{3\mathrm{D}}$ discovered previously, a novel blue phase, called BP X, can be obtained…
The effect of two diphosphonates, ethane-1-hydroxy-1, 1-diphosphonic acid (EHDP) and 1,2-dihydroxy-1,2-bis(dihydroxyphosphonyl)ethane (DDPE) on the precipitation of calcium carbonate has been investigated. EHDP and DDPE were found to reduce markedly the rate of crystallization at solution concentrations as low as 10–7…
Under optimum conditions, Cu2+-exchanged FeZSM5 catalyses the oxidation of methane by nitrous oxide with high selectivity for methanol production. H+-Exchanged FeZSM yields mainly carbon oxides.
Bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) esters with a wide range of compositions (0–90 mol % 3-hydroxyvalerate units) have been isolated from Alcaligenes eutrophus grown in nitrogen-free culture media containing pentanoic acid and glucose.
The columnar liquid crystalline structure of terephthal-bis-<4-(3',4',5'-triheptyloxybenzoyloxy)-aniline> has been studied using dilatometry and X-ray diffraction. It corresponds to the stacking of the rodlike phasmidic molecules in columns. These are arranged according to a two-dimensional hexagonal lattice.
Abstract Amorphous hydrogenated silicon carbide (a‐SiC:H) films are prepared by magnetron sputtering of crystalline silicon in an argon—hydrogen—methane atmosphere. The specific absorption modes (wagging, rocking, deformation, stretching) of the SiC, (CH m ) n C/Si( n = 1, 2, 3; m = 2, 3), and SiH m −( m = 1,2) grou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst isolation of a stable aliphatic thioaldehyde, tris(trimethylsilyl)ethanethialRenji Okazaki, Akihiko Ishii, and Naoki InamotoCite this: J. Am. Chem. Soc. 1987, 109, 1, 279–280Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published…
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The reverse martensite transformation of an as-quenched Cu–Al–Ni shape memory alloy presents two separate stages which are studied by means of calorimetry. The first stage, corresponding to the lower temperatures, presents a thermal hysteresis of about 10 K, a continuous behaviour of the energy dissipation and a very…
Hydrogenase II contains two iron-sulfur clusters, one of the [4Fe-4S] type and one of unknown structure with unusual spectral properties (H-cluster). Using Mössbauer spectroscopy we have studied the H-cluster under a variety of conditions. In the reduced state the cluster exhibits, in zero magnetic field, spectra with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVTFTIR and light-induced excited spin state trapping in bis(2,2'-bipyridine)bis(thiocyanato)iron and related spin-crossover compoundsRolfe H. HerberCite this: Inorg. Chem. 1987, 26, 1, 173–178Publication Date (Print):January 1, 1987Publication History Published online1 May 2…
The theory of multilayer optics relevant to the following fields of application is given: The choice of materials for efficient XUV reflectors, Obtainment of high spectral resolution, Construction of polarizers and collimators for XUV beams.
The interface of partially hydrolyzed organosilane primer Dow Corning® Z-6020 [N-(2-aminoethyl-3-aminopropyl trimethoxy silane], which will be referred to in this paper as simply AEAPS, and polyvinyl chloride (plastisol) was examined by XPS (X-ray photoelectron spectroscopy) depth profile analysis. These studies and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariation in nitroxide probe chain flexibility within sodium dodecyl sulfate hemimicellesPrem. Chandar, P. Somasundaran, Kenneth C. Waterman, and Nicholas J. TurroCite this: J. Phys. Chem. 1987, 91, 1, 148–150Publication Date (Print):January 1, 1987Publication History Publis…
The paper presents the results of a study conducted on polymeric insulating materials in a salt-fog chamber. The materials examined include high temperature vulcanized (HTV) silicone rubber, ethylene propylene rubber (EPR) and cycloaliphatic epoxy. The influence of inorganic filler, type, concentration and dispersion…
In aqueous concentrated solution, DNA forms cholesteric liquid crystalline phases whose textures were previously analysed. The transition between the isotropic and the cholesteric phase occurs generally with formation of cholesteric spherulites which grew inside of the isotropic phase and coalesce to give a homogeneou…
A damage parameter is introduced in addition to conventional parameters of continuum mechanics and consider a crack surrounded by an array of microdefects within the continuum mechanics framework. A system consisting of the main crack and surrounding damage is called crack layer (CL). Crack layer propagation is an irr…
The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercal…