Materials Literature
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For molecular-scale electronic devicesnon-conjugated materials whose π-orbitals are close enough to allow energy transfer by the so-called Dexter mechanism are of interest. In this paper the synthesis of a soluble polymer (see Figure) is described in which aromatic conjugation and through-space π-orbital overlap (homo…
An investigation of the dependence of the thermal stability of DLC (a-C:H) and silicon-modified DLC (a-C:H:Si) films on film-deposition conditions has been conducted. An interpretation based on plasma chemistry, x-ray photoelectron spectroscopy, confocal Raman spectroscopy and substrate-bias-voltage changes is propose…
pH microsensors were incorporated into a microcapillary cell to monitor pH changes simultaneously with electrochemical measurements. The microsensors ( diameter d = 10 μ m ) were positioned at the center of the microcapillary cell tip opening ( d = 100 μ m ) and 50 mm above the surface of the sample. During the dissol…
A new, convenient method for the preparation of functionalised precursors to stable tetraalkylisoindoline nitroxides (aminoxyls) is presented. Simple treatment of 2-benzyl-1,1,3,3-tetramethylisoindoline 2 with Br2 in CCl4 gives rapid oxidative debenzylation, generating benzaldehyde and an unusual bromoamine, 2-bromo-1…
A straight dislocation line in a decagonal quasicrystal is considered. For a decagonal quasicrystal of point groups 10, and 10/ m with a straight dislocation parallel to the periodic direction, the basic governing equations are solved by decoupling this problem into a plane elasticity problem and an antiplane elastici…
Complexes of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayltetramethylenetetrakis(phenylphosphinic acid) H4L1 with yttrium and a number of lanthanides were synthesized and the crystal structures of Li[LaL1(H2O)]·10H2O and Li[CeL1(H2O)]·10H2O determined. The complexes are isostructural with RSRS configurations at the…
The two termini of the torsionally strained dithiadiazolyl diradical S2N2C–C6H3Me–MeC6H3–CN2S2 3 possess different solid state structural environments; the bulk magnetic susceptibility of 3 is interpreted in terms of the distinct properties of the two radical centres.
Parallel (in-plane) electrical resistivities of single-layered Cu and Cr films, and Cu/Cr multilayered thin films sputter deposited on Si substrates were evaluated as a function of layer thicknesses ranging from 2.5 to 150 nm in the temperature range of 4–325 K. The resistivity of the multilayers at a given temperatur…
After providing basic information on enzymes involved in cholesterol homeostasis, and on management of hypertriglyceremia and hypercholesterolemia, with the aid of cholestyramine and fibric acid, this chapter examines the effects of the ingestion of chitosan. Dietary chitosan is effective on serum cholesterol and in a…
The resolution and precision of X-ray powder diffraction data of a silicon standard obtained by a Gandolfi camera were examined by comparing with those obtained by a diffractometer. The peak width (FWHM) and integral breadth of reflections obtained by a Gandolfi camera take vales similar to those obtained by a diffrac…
An AB 2 monomer containing one oxazoline and two phenolic units was synthesized. The polymerization of the monomer 2-(3,5-dihydroxyphenyl)-1,3-oxazoline in N-methylcaprolactam resulted in a well-defined and fully soluble, high molar mass, hyperbranched polymer with etheramide structure. The hydrolysis of some oxazolin…
Ni2MnGa bulk specimen has a Heusler-type crystal structure and is ferromagnetic. The cubic structure transforms to a tetragonal structure through the martensitic transformation during cooling. In this study, Ni2MnGa thin films were deposited on a PVA substrate by the sputtering method using a high frequency magnetron…
Coatings of room-temperature vulcanized (RTV) silicone rubber (SIR) are used increasingly on outdoor HV porcelain and glass insulators and bushings when subjected to heavy pollution. An important property of the RTV-SIR coating is its ability to restore the hydrophobicity of the surface after a layer of contamination…
The findings of an investigation of temperature-manipulated size and shape evolution for pre-formed decanethiolate–encapsulated gold nanocrystals are described.
Chitosan has wide-ranging applications as a biomaterial, but its stability in storage is not widely known. The objective of this study was to evaluate the storage stability of films prepared from chitosan of 77% deacetylation. Both the neutralized and acetate films were evaluated, as chitosan salts offer the advantage…
An electrolytic reduction treatment using cathodic polarization at constant potential was applied to heavily corroded lead objects which had been exposed for a long time to corrosive organic acid vapours. Experimental conditions were determined through chemical and electrochemical tests conducted on artificially carbo…
In order to obtain composites of calcium carbonate (CaCO3) encapsulated by polystyrene (PS), soapless polymerization of styrene (S) in aqueous phase in the presence of CaCO3 was carried out. Influences on the encapsulation and on monomer conversion were studied. Results showed that monomer conversion higher than 52% c…
The electronic structure of CaTiO 3 was experimentally examined by x-ray and ultraviolet photoemission spectroscopy, bremsstrahlung isochromat spectroscopy (BIS) and x-ray absorption spectroscopy. The photoemission spectra and BIS spectra were compared with the partial density of states (PDOS) estimated by an energy b…
The synthesis, characterization and spectral properties of six new meso-aryl core modified sapphyrins are described. An efficient approach involving an acid catalyzed condensation of bithiophene diol 1 and modified tripyrranes 2a–2e allows preparation of the desired meso-aryl sapphyrins in 16–36% yield. The product di…
Chitosan microspheres containing cis-platin were prepared using a w/o emulsion system. Variables important for microsphere properties were investigated: these include; chitosan, cis-platin and glutaraldehyde concentrations, the types of chitosan and oil, the cross-linking process and stirring rate. Chitosan and glutar…