318:. Similarly to conventional functional silica based materials, two classes of ionosilicas can be distinguished, depending on the way the ionic group is anchored to the silica support and where it is located. Surface functionalized ionosilicas contain ionic groups located on the materials’ surface and can be obtained either via ‘one-pot’ co-condensation reactions or post grafting procedures. On the other side, periodic mesoporous ionosilicas, belonging to the PMO family, are produced starting from oligo
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El Kadib, Abdelkrim; Hesemann, Peter; Molvinger, Karine; Brandner, Jérôme; Biolley, Christine; Gaveau, Philippe; Moreau, Joël J. E.; Brunel, Daniel (4 March 2009). "Hybrid
Materials and Periodic Mesoporous Organosilicas Containing Covalently Bonded Organic Anion and Cation Featuring MCM-41 and SBA-15
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Ionosilicas are synthesized via hydrolysis-polycondensation reactions involving ionic precursors. The ionic nature of these compounds has deep influence on the mechanism of the formation of the solid. Ionosilicas with regular architectures are often formed in the presence of anionic surfactants. This
337:. These features can efficiently be varied both via the cation and the anion, resulting in an ability to fine-tune the properties of these materials. Ionosilicas are functional materials for applications in (organo-)catalysis and separation.
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Mesoporous materials have been defined as porous materials with pore size ranging from 2 nm – 50 nm. Ionosilicas belong to the mesoporous organosilicas materials, but are more specifically constituted by ionic substructures.
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Nguyen, Thy Phuong; Hesemann, Peter; Moreau, Joël J.E. (June 2011). "i-Silica: Nanostructured silica hybrid materials containing imidazolium groups by hydrolysis-polycondensation of disilylated bis-N,N′-alkyl-imidazolium halides".
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Nguyen, Thy Phuong; Hesemann, Peter; Linh Tran, Thi My; Moreau, Joël J. E. (2010). "Nanostructured polysilsesquioxanes bearing amine and ammonium groups by micelle templating using anionic surfactants".
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Motos-Pérez, Blanca; Roeser, Jérôme; Thomas, Arne; Hesemann, Peter (May 2013). "Imidazolium-functionalized SBA-15 type silica: efficient organocatalysts for Henry and cycloaddition reactions".
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reactions or post synthesis grafting procedures involving ionic precursors. Due to their mixed mineral-ionic nature, ionosilicas are situated at the interface of silica hybrid materials and
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Hankari, Samir El; Motos-Pérez, Blanca; Hesemann, Peter; Bouhaouss, Ahmed; Moreau, Joël J.E. (2011). "Periodic mesoporous organosilica from zwitterionic precursors".
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Gadenne, Benoît; Hesemann, Peter; Moreau, Joël J. E. (2004). "Supported ionic liquids: ordered mesoporous silicas containing covalently linked ionic species".
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behaviour displays the formation of precursor-surfactant ion pairs in the hydrolysis polycondensation mixture.
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Thach, U.D.; Prelot, B.; Hesemann, P. (30 July 2015). "Hybrid
Ionosilica containing aromatic groups".
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These hybrid ionosilicas display very specific and unusual surface properties such as high
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It may require cleanup to comply with
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containing chemically bound ionic groups. They represent a class of
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Hesemann, Peter; Nguyen, Thy; Hankari, Samir (11 April 2014).
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