Investigation of mixed fluorinated and triblock copolymer liquid crystals: Imprint for mesostructured bimodal silica

Abstract : Due to the difference in mutual phobicityo between fluorocarbon and hydrocarbon chains, mixtures of fluorinated and hydrogenated surfactants are excellent candidates to design bimodal systems having two types of mesopores. In literature, only a few papers deal with these bimodal systems. Here hexagonal liquid crystal mixtures of the polyoxyethylene fluoroalkyl ether [R-8(F)(EO)(9)] and the Pluronic [P123] have been used to template this kind of mesostructure through the liquid crystal mechanism, which is barely considered. After the detailed investigation of the R-8(F)(EO)(9)/P123/water liquid crystal domain, materials have been synthesized and characterized by small angle X-ray scattering, transmission electron microscopy and nitrogen adsorption-desorption analysis. Our results show that this system provides two separate pore sizes in the materials over the mesoporous range. The ratio between the small mesopores and the large ones depends on the proportion between the porogens in the mixture. Nonetheless, we also outline that a minimum quantity of silica is required to recover the two hexagonal networks.
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Journal of Colloid and Interface Science, Elsevier, 2015, 446, pp.170-176. 〈10.1016/j.jcis.2015.01.030〉
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Soumis le : lundi 27 mars 2017 - 10:23:37
Dernière modification le : mardi 16 janvier 2018 - 10:24:44

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Karine Assaker, Issam Naboulsi, Marie-José Stebe, Melanie Emo, Jean-Luc Blin. Investigation of mixed fluorinated and triblock copolymer liquid crystals: Imprint for mesostructured bimodal silica. Journal of Colloid and Interface Science, Elsevier, 2015, 446, pp.170-176. 〈10.1016/j.jcis.2015.01.030〉. 〈hal-01495966〉

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