Materials Literature
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Brillouin and neutron-scattering measurements of TA-phonon branches are reported for SrTiO 3 at small wave vectors and at temperatures well below the 105 K structural transition. Anomalous softening in the former measurements, and dispersion in the latter, are found in the quantum paraelectric regime. Furthermore, an…
Single-cell forward light scattering patterns have been examined for four algal species (one pennate diatom, two green flagellates and one filamentous cyanobacterium), mounted statically in a focused laser beam. In all cases, the distribution of light intensity at narrow angles (within the first scattering lobe) is we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding properties of calcium gallium arsenide, Ca14GaAs11: a compound containing discrete GaAs4 tetrahedra and a hypervalent As3 polyatomic unitR. F. Gallup, C. Y. Fong, and Susan M. KauzlarichCite this: Inorg. Chem. 1992, 31, 1, 115–118Publication Date (Print):January 1, 1…
The radiation-induced conductivity (RIC) in polypropylene, polyethylene terephthalate, and polyimide due to electron-beam irradiation is measured with an external bias method and, in the case of polypropylene, also with a short-circuit method, as a function of dose rate and time of irradiation or total dose. The resul…
The field of molecular metals and superconductors has developed rapidly since the first molecular metal was discovered in the late 1960s. The most extensive range of compounds are based on planar organic donor molecules containing sulfur or selenium atoms and complex metal anions containing multi-sulfur ligands. This…
The leaching of water-soluble plasticizers from polymeric films prepared by casting and drying of plasticized colloidal polymer dispersions was investigated with respect to the type and concentration of plasticizer (triethyl citrate or triacetin), film thickness, type of colloidal polymer dispersions (acrylic: Eudragi…
The changes in the crystal structure of poly(3-alkylthiophene)s resulting from doping have been studied by X-ray diffraction measurements of electrochemically doped poly(3-alkylthiophene) films. The lattice parameter a, which corresponds to the distance between main chains along the side alkyl chain, increases upon do…
WO3 films have been electrodeposited in a solution containing dissolved tungsten and alcohol. The deposition conditions and the deposition efficiency on various substrates were studied. The properties of the electrodeposited WO3 film were characterised by electrochemical, surface analytical and in situ optical techniq…
Magnesium alloys with Gadolinium or Terbium, whose content 20mass% was near the maximum solid solubility, were melted by means of a fluxless method and their age hardening behavior, mechanical properties at elevated temperature and physical properties were investigated. Both alloys exhibit considerable age hardening a…
In resolutions based on the solubility difference between pairs of diastereoisomeric salts, the maximum efficiency (parameter S) can be calculated from a knowledge of the eutecic composition of the binary T–x diagram. We demonstrate that an approximate binary phase diagram can be determined from the DSC melting curve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-catalyzed oxidative degradation of collagenKoji. Uchida, Yoji. Kato, and Shunro. KawakishiCite this: J. Agric. Food Chem. 1992, 40, 1, 9–12Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs…
The effects of different relative humidities on some physical properties of three types of calfskin parchment (vellum) were investigated. Standard samples were subjected to (1) tensile fracture, and (2) measurement of the force that developed when the restrained samples were subjected to step decreases in relative hum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the interface between pyromellitic dianhydride/oxydianiline polyimide and silver using surface-enhanced Raman scatteringJ. T. Young, W. H. Tsai, and F. J. BoerioCite this: Macromolecules 1992, 25, 2, 887–894Publication Date (Print):January 1, 1992Publicat…
Abstract The syntheses of several functionalised aryl cyanate esters bearing reactive allyl groups are presented. The monomers were purified (to c . 98%) using preparative HPLC and a range of techniques, including heteronuclear nuclear magnetic resonance (NMR) spectroscopy, was employed in their characterisation. A mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of biodegradable aromatic anhydride copolymersAbraham Domb J.Cite this: Macromolecules 1992, 25, 1, 12–17Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/…
The interactions between several commonly used preservatives, i.e. benzalkonium chloride, chlorhexidine gluconate, chlorobutanol, methylparaben and propylparaben, and 2-hydroxypropyl-β-cyclodextrin were investigated. The interactions were shown to be twofold. Firstly, the preservative molecules can displace the drug m…
General and pitting corrosion resistance of a SAF 2205 alloy with varying σ phase contents has been investigated in a 10%H2SO4 solution and a 3·5%NaCl solution. It was found that the presence of the σ phase decreased the corrosion potential of SAF 2205 in H2SO4 and NaCl. Only at a σ phase content of more than 21% does…
Two new oxypregnane-oligoglycosides named calotroposides A (1) and B (2) have been isolated from the root of Calotropis gigantea (Asclepiadaceae), an Indonesian medicinal plant, and their chemical structures have been elucidated by chemical and spectroscopic methods as 12-O-benzoyllineolon 3-O-beta-D-cymaropyranosyl(1…
Poly(2,2′-bipyridine-5,5′-diyl)(PBpy), a π-conjugated electrically conducting chelate polymer, forms electrochemically active complexes with Ru and Ni; a cyclic voltammogram of the Ru-complex shows redox peaks which are accounted for by assuming electron exchange between the Ru species through the polymer backbone, an…
Investigation of mechanisms of the surface deterioration of the roll for the hot strip rolling is very important for the development of the new roll material. Then, several experiments are conducted based upon results obtained by earlier investigations, and considerations concerning it are given.The experiments are a…