Aging process of some pyrogenic silica samples exposed to controlled relative humidities
| Autor: | Boualem Hamdi, Henri Balard, Jean-Baptiste Donnet, T. Gottschalk-Gaudig, E. Brendlé, N. Nedjari |
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| Rok vydání: | 2016 |
| Předmět: |
Chromatography
Size-exclusion chromatography 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Silanol chemistry.chemical_compound Colloid and Surface Chemistry Chemical engineering chemistry Specific surface area Siloxane Inverse gas chromatography Surface roughness Relative humidity 0210 nano-technology Fumed silica |
| Zdroj: | Colloids and Surfaces A: Physicochemical and Engineering Aspects. 488:46-51 |
| ISSN: | 0927-7757 |
| Popis: | In the present study, we have examined the influence of the aging process under controlled relative humidity on the surface properties of 3 silicas samples of increasing specific surface area. Both comparison of the specific surface areas, determined using either nitrogen (BET) or cetyltrimethylamonium bromide (CTAB), and the surface nanoroughness indexes, determined by size exclusion inverse gas chromatography, indicates that the ageing process has no significant influence on the surface morphology at the molecular level. On the contrary, IGC at finite concentration using isopropanol as probe evidences clearly an increase of the surface heterogeneity induced by the formation of new silanol groups into the preexisting hydrophilic domains by opening of siloxane bridges by water. |
| Databáze: | OpenAIRE |
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