2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 390 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Ionosilicas: Organosilicas From Silylated Ionic Liquid Precursors
Peter Hesemann1; Benedicte Prelot1; Ut Dong Thach1; Roza Bouchal1;1INSTITUT CHARLES GERHARDT DE MONTPELLIER, Montpellier, France;
Type of Paper: Regular
Id Paper: 440
Topic: 13
Abstract:
Ionosilicas, defined as silica based materials containing covalently anchored ionic groups [1], recently emerged as a new family of functional materials. Ionosilicas combine high porosity, regular architecture on the mesoscopic level with an unmatched chemical versatility, induced by the high variability and the high number of incorporated ionic species. Due to their mixed ionic-mineral nature, ionosilicas are situated at the interface of ionic liquids and silica hybrid materials.
The first part of this talk will focus on the synthesis of structured ionosilica mesophases. Ionosilicas are obtained under very mild reaction conditions via template directed hydrolysis-polycondensation reactions starting from trialkoxysilylated ionic precursors [2,3]. The formation of structured ionosilica mesophases can only be achieved from suitable surfactant-precursor ion pairs. This approach is particularly appealing as both precursor and surfactant can be modulated, thus allowing a control over chemical constitution and architecture of the formed materials.
Ionosilicas can be considered as heterogenized and porous ionic liquid phases. They exhibit tunable interfacial properties in terms of hydrophilicity and water affinity [4]. Ionosilicas represent a real alternative for applications in catalysis and separation. This feature will be illustrated by the unique properties in ion exchange. Ionosilicas efficiently trap anionic metal complexes [5], halides [6] and drugs [7] and therefore have great potential for applications in fields as different as medicine, water treatment or the nuclear fuel management.
In summary, ionosilicas represent a very particular class of functional silica based materials displaying unique chemical and physico-chemical properties, together with remarkable surface properties. For this reason, ionosilicas have an outstanding position in the area of silica based materials and are more than simple silica supported ionic liquids.