From Ionic Liquids to nanostructured Ionic Solids: Design, Processing and Applications of Ionosilicas

General ILL Seminar
Organised by College 6

Thursday, 3 October 2019 at 14h00
Seminar room (1st floor), ILL 4

Peter Hesemann
Institut Charles Gerhardt de Montpellier, Université de Montpellier, France
peter.hesemann@umontpellier.fr

The Sol Gel process is a highly versatile method to access nanostructured oxides with defined textures, architectures and morphologies. The Sol Gel process involves bottom-up approaches, that is, materials are formed from the molecular level, starting from molecular precursors. It allows controlling the surface properties of the formed materials over several orders of magnitude, from the nanoscopic up to the microscopic length scale.

In this talk, we will illustrate the versatility of the Sol Gel process by the example of so-called ionosilicas. These materials are synthesized via hydrolysis-polycondensation reactions from ionic silylated precursors. Adapted and specific synthesis strategies allow accessing tailored materials with defined properties. In particular, the ionic nature of the used precursors modifies the behaviour in template directed approaches. The rationalization of precursor-surfactant interactions allows to elucidate the mechanism of the materials’ formation and to design organized and structured phases.

Ionosilicas are functional materials, combining defined textural features induced by the silica part and chemical functionality characteristics of the ionic group. They appear as interesting model systems for the investigation of various aspects both from fundamental and applied materials science. The investigation of ionosilicas therefore offers a combination of different aspects arising from molecular, supramolecular, and physical chemistry and materials’ science. We will illustrate with some representative examples that ionosilicas are highly innovative materials with high potential for applications in a plethora of fields, e.g. water treatment, catalysis and the biomedical sector.

References
1)    P.Hesemann, S. El Hankari, T.P. Nguyen, Materials 2014, 7, 2978-3001.
2)    R. Bouchal, M. Daurat, M. Gary-Bobo, A. Da Silva, L. Lesaffre, P.Dieudonné, C. Charnay, J.-O. Durand, P. Hesemann, ACS Appl. Mater. Interf., 2017, 9, 32018-32025.
3)    U. D. Thach, B. Prelot, S. Pellet-Rostaing, J. Zajac and P. Hesemann, ACS Applied Nano Materials 2018, 1, 2076-2087.

Michael Marek Koza
(College 6 Secretary)

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