Electrostatic vs. covalent bond in modified Jeffamine: effect on the phase behaviour and on the templating of mesoporous silica

Abstract : Ionic and covalent combinations of oleic acid and Jeffamine ED900, a homoditopic polyetheramine, lead to novel porogens, either ``cataniomeric'' or nonionic surfactants, bearing respectively ammonium/carboxylate ionic pairs and/or amidic bonds. The effect of the electrostatic interaction vs. the covalent bond at the molecular level is clearly evidenced by the differences in the self-assembling behaviour, in either micellar or liquid crystal domains. Organized mesoporous materials were prepared through the cooperative templating mechanism from micelles and a silica source. The optimal reaction conditions were different for the nonionic (A) and di-ionic (B) surfactants, and the resulting materials had various morphologies (rod-like vs. spheres) and pore sizes (4 vs. 14 nm). Interestingly, the hybrid surfactant exhibits a versatile behaviour regarding the silica formation, acting as either a nonionic or a di-ionic surfactant in its respectively optimal conditions, A or B. This behaviour highlights the uniqueness of dynamic micelles as a novel supramolecular tool for the design of tailored mesoporous materials and could represent a novel platform for the design of pH responsive controlled drug delivery systems.
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Article dans une revue
Soft Matter, Royal Society of Chemistry, 2013, 9 (45), pp.10832-10840. 〈10.1039/c3sm52018h〉
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Soumis le : mercredi 22 mars 2017 - 13:52:46
Dernière modification le : mardi 16 janvier 2018 - 10:24:44

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Nadia Canilho, Andreea Pasc, Melanie Emo, Marie-José Stebe, Jean-Luc Blin. Electrostatic vs. covalent bond in modified Jeffamine: effect on the phase behaviour and on the templating of mesoporous silica. Soft Matter, Royal Society of Chemistry, 2013, 9 (45), pp.10832-10840. 〈10.1039/c3sm52018h〉. 〈hal-01493923〉

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