Relationships between surface compositions and properties of surfaces of mixed fumed oxides |
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Authors: | VM Gun’ko YM Nychiporuk EV Goncharuk R Leboda E Skwarek GR Yurchenko YG Ptushinskii PP Gorbik K Gude |
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Institution: | a Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine b Faculty of Chemistry, Maria Curie-Sk?odowska University, 20031 Lublin, Poland c Institute of Physics, 46 Prospect Nauki, Kiev, Ukraine d Eastern Illinois University, Charleston, IL 61920, USA |
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Abstract: | Fumed oxides SiO2/Al2O3 (SA), SiO2/TiO2 (ST) and Al2O3/SiO2/TiO2 (AST) at different content of alumina and titania were investigated by one-pass temperature-programmed desorption (OPTPD) time-of-flight mass-spectrometry (TOFMS), Auger electron spectroscopy (AES), NMR, FTIR, thermally stimulated depolarization current (TSDC), microcalorimetry, adsorption of nitrogen, water, (dimethylamino)azobenzene (DMAAB) and metal ions (Pb(II) and Ni(II)). It was shown that all the studied adsorption/desorption and energetic properties of mixed fumed oxides depend strongly on the surface content of alumina (shown as a surface content of aluminum, ) in SA and AST and titania (shown as a surface content of titanium, ) in ST and AST. Many of these properties demonstrate clear correlations with the and values over the total range of alumina and titania content in the materials. |
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Keywords: | Fumed SiO2/Al2O3 Fumed SiO2/TiO2 Fumed Al2O3/SiO2/TiO2 Auger electron spectroscopy NMR FTIR One-pass temperature-programmed desorption time-of-flight mass-spectrometry Nitrogen adsorption Water adsorption/desorption (Dimethylamino)azobenzene adsorption Pb(II) adsorption Ni(II) adsorption Surface hydroxyls Debye screening length |
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