Materials Literature
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We present a new texturing technique applicable to silicon solar cells. The technique is based on the isotropic etching of silicon through a very thin layer of silicon nitride, deposited by low-pressure chemical vapor deposition. Spectrophotometry measurements show that the resulting surface texture displays low refle…
Some patients cannot undergo coronary angiography (CAG) because of the adverse effects of contrast media. In the present study gadolinium, (gadodiamide hydrate: Gd DTPA-BMA) commonly used for magnetic resonance imaging (MRI), was used as the contrast agent for diagnostic CAG in 3 patients with severe allergy to iodine…
Abstract Kaolin clays are layer aluminosilicates showing a large variety of physicochemical properties. The most common clay mineral, kaolinite, has been widely studied and it crystallizes in space group P1. We used the ab initio method in order to study kaolinite structure. The RHF calculations were performed at diff…
Two H-shaped supramolecular complexes (C32H16N8Zn)2·(C12H12N2)·0.96H2O (1), (C32H16N8Zn)2·(C12H10N2)·(DMF)2 (2), and one T-shaped supramolecular complex C32H16N8Zn·C13H14N2 (3) have been prepared from zinc(II) phthalocyanine with 1,2-bis(4-pyridyl)ethane (bipy-eta), 1,2-di(4-pyridyl)ethylene (dipy-ete) or 1,3-di(4-pyr…
Abstract Using transmission electron microscopy (TEM) and scanning force microscopy (SFM), this work deals with morphology and micromechanical deformation behavior of coextruded multilayers comprising alternating layers of polycarbonate (PC) and polyethylene terephthalate (PET). The multilayered composites were found…
Experimental results on the interaction of methanol with a Au(310) surface studied using X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) are reported. At 80 K methanol forms a physisorbed condensed layer above 5 L of exposure. Interestingly, O-H bond scission takes place above 150 K…
Controlled release and conversion of guest species (CO2) in zeolite microcapsules was achieved thanks to the high microporosity and the thermal and chemical stability of the zeolite shells.
Surface modification of polycrystal tungsten due to low-energy and high-flux helium plasma exposure was investigated. Micron-sized holes and bubbles were formed on the surface at a surface temperature of 2200 K even when the incident ion energy of helium was 10 eV. Hole formation was significantly reduced on the surfa…
Halogen-containing organically modified clay nanocomposites have been prepared and it was found that the presence of bromine enhances the fire retardancy of polystyrene and polypropylene nanocomposites, compared with the virgin polymers. The nanocomposites were evaluated by X-ray diffraction (XRD), thermogravimetric a…
Blood compatibility is dictated by the manner in which their surfaces interact with blood constituents like RBCs, WBCs, platelets and blood proteins. The aim of this study was to investigate the effect of surface free energy and the corresponding work of adhesion of biomaterial surfaces on such interactions. Hydroxyap…
A DRIFTS study of ethane adsorption by the univalent copper cations in Cu(1)-ZSM-5 zeolite prepared by chemical reaction of the corresponding hydrogen form (Si/Al = 150) with CuCl vapour at 573 K reveals an unusual spectrum of adsorbed C2H6. In addition to the weakly perturbed narrow bands in the region of C-H stretch…
Cross-linked co-polymers containing glycidyl azide polymer (GAP) and hydroxyl-terminated poly(butadiene) (HTPB) segments have been obtained by chemical reactions. The reactions involves two steps. In the first step the GAP macroinitiator (GAPMI) is synthesized by the condensation reaction of GAP-diol with 4,4'-azobis(…
Monolithic siliceous materials were prepared, using sol–gel based methods, from mixtures of trifunctional silanes based on sugar lactones, including silyl-modified gluconamide GLS and maltonamide MLS, and a tetrafunctional silane derived from glycerol. The tri- and tetrafunctional compounds cured at different rates, w…
In an effort to build effective photovoltaic cells based on porphyrin-functionalised polythiophenes we have focused on synthetic routes to three monomer types. By controlling the geometric structure of the monomer, oxidation of these materials should produce polymers with different architectural structures, and as a r…
A series of structurally characterised mu-cyanodicopper(II) cryptates shows moderately strong antiferromagnetic interaction in the range -2J= 150-200 cm(-1), at the high end of the observed range for such assemblies. The lowest magnetic exchange coupling parameter is displayed where there is slight bending of the M-CN…
The materials for use in nitric acid service have to be resistant to intergranular corrosion and have low general corrosion rates. End grain corrosion resulting from inclusions and segregation along dislocation bands needs to be minimised. The Nitric Acid Grade of stainless steel resistant to these corrosion problems…
Gelatin hydrogels cross-linked by y-ray irradiation using 60Co as gamma-ray source were prepared. As a model of controlled release of low-molecular-weight compounds, absorption and release of methylene blue, a water-soluble cationic dye, was investigated. Irradiated gelatin hydrogels did not redissolve at temperatures…
Rückamp, R.; Benckiser, E.; Haverkort, M. W.; Roth, H.; Lorenz, T.; Freimuth, A.; Jongen, L.; Möller, A.; Meyer, G.; Reutler, P.; Büchner, B.; Revcolevschi, A.; Cheong, S. W.; Sekar, C.; Krabbes, G.; Grüninger, M.
Author: Oettel, M. et al.; Genre: Journal Article; Issued: 2005-08-17; Keywords: MPI für Metallforschung; Abt. Dietrich; Wetting and Capillarity; Title: Attractions between charged colloids at water interfaces
Water is capable of reducing the rate of deactivation of gold-titania catalysts for propene epoxidation.