Surface structure and properties of mixed fumed oxides
| Autor: | Kalyani Gude, V.D. Osovskii, Jadwiga Skubiszewska-Zięba, Yu.G. Ptushinskii, Vladimir M. Gun’ko, Vladimir I. Zarko, Jonathan P. Blitz, S.V. Pakhovchishin, Y.M. Nychiporuk, Roman Leboda, P.P. Gorbik, O.A. Mishchuk, E.V. Goncharuk |
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| Rok vydání: | 2007 |
| Předmět: |
Isothermal microcalorimetry
Magnetic Resonance Spectroscopy Surface Properties Analytical chemistry Oxide Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Desorption Phase (matter) Specific surface area Materials Testing Spectroscopy Fourier Transform Infrared Aluminum Oxide Fourier transform infrared spectroscopy Fumed silica Titanium Auger electron spectroscopy Chemistry technology industry and agriculture Oxides Silicon Dioxide Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering Thermodynamics |
| Zdroj: | Journal of colloid and interface science. 314(1) |
| ISSN: | 0021-9797 |
| Popis: | A variety of fumed oxides such as silica, alumina, titania, silica/alumina (SA), silica/titania (ST), and alumina/silica/titania (AST) were characterized. These oxides have different specific surface areas and different primary particle composition in the bulk and at the surface. These materials were studied by FTIR, NMR, Auger electron spectroscopy, one-pass temperature-programmed desorption with mass spectrometry control (OP TPDMS), microcalorimetry, and nitrogen adsorption. Nonlinear changes in the surface content of alumina in SA and AST and titania in ST and AST samples with increasing oxide content along with simultaneous changes in their specific surface area cause complex dependencies of the heat of immersion in water and desorption of water on heating on the structural parameters. Simultaneous analysis of changes in the surface phase composition, in the concentration of hydroxyls, and in the structural characteristics reveals that at a low content of the second phase the structural characteristics (e.g., S BET ) are predominant; however, at a large content of these oxides the phase composition plays a more important role. |
| Databáze: | OpenAIRE |
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