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Effect of non-ionic surface active agents on TEOS-derived sols, gels and materials

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Abstract

The sol-gel process, starting from tetraethylorthosilicate precursor, is a suitable technique for the preparation of silica thin films. The use of specific organic additives, like non ionic surface-active agents, drastically modifies the gelation process and allows the preparation of microporous materials with a high microporous volume. The effects of additives on the sol, gel and material characteristics have been investigated by several methods such as 29Si NMR, QELS, SAXS (for sols and gels), and N2 adsorption, FESEM (for fired materials). It appears that the interactions of surface active agents with TEOS derived species limit condensation reactions and particle growing. A brittle gel structure is generated which leads to highly porous microporous silica after the elimination of organic chains by thermal treatment at 450°C. The material porous texture (specific surface area, pore size distribution and porous volume) can be varied especially by varying the surface active agent chain length and quantity. This kind of sol-gel system is suitable to prepare microporous silica membranes candidate for gas separation or catalytic reactor applications.

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Authors and Affiliations

  1. Laboratoire des Matériaux et Procédés Membranaires (UMR 9987 CNRS), Ecole Nationale Supérieure de Chimie, 8 Rue de l'Ecole Normale, 34053, Montpellier Cedex 1, France

    A. Julbe, C. Balzer, J. M. Barthez, C. Guizard, A. Larbot & L. Cot

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  1. A. Julbe
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  2. C. Balzer
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  3. J. M. Barthez
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  4. C. Guizard
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  5. A. Larbot
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  6. L. Cot
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Julbe, A., Balzer, C., Barthez, J.M. et al. Effect of non-ionic surface active agents on TEOS-derived sols, gels and materials. J Sol-Gel Sci Technol 4, 89–97 (1995). https://doi.org/10.1007/BF00491675

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  • DOI: https://doi.org/10.1007/BF00491675

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