Susan SANANES ISRAEL (LNER) will defend her Ph.D. dissertation entitled "Silica surfaces functionalized in supercritical carbon dioxide : effects of confinement and behavior in aqueous solution" on Tuesday, September 18th, 2018 at 10.00 am (ICSM Auditorium).
Surface functionalization of silica lead to the synthesis of materials with possible applications in the selective ion extraction. However, organic solvents classically used to functionalize the silica surface have economic and environmental issues. Supercritical carbon dioxide (SC CO2) seems a greener alternative to the use of these organic solvents. The aim of this PhD work is to characterize the SC CO2 functionalization of silica surfaces by alkoxysilanes, to determine the evolution of the grafting in nanometric media and to precise the behavior of the materials in aqueous solution. Different model systems based on silica have been used as grafting supports: plane silica surfaces, parallel and plane surfaces spaced of few nanometers (silica nanochannels) and organised mesoporous silica (SBA-15).