Investigation of mixed ionic/nonionic building blocks for the dual templating of macro-mesoporous silica

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:533

Article

Roucher, Armand^1,2,3  Emo, Melanie^2,3  Vibert, Francois^2,3  Stebe, Marie-Jose^2,3  Schmitt, Veronique¹  Jonas, Florian^2,3  Backov, Renal^1,4  Blin, Jean-Luc^2,3 

[1] Univ Bordeaux, CNRS, CRPP, UMR5031, 115 Ave Albert Schweitzer, F-33600 Pessac, France

[2] Univ Lorraine, UMR CNRS L2CM 7053, Inst Jean Barriol, Fac Sci & Technol, BP 70239, F-54506 Vandoeuvre Les Nancy, France

[3] Univ Lorraine, UMR CNRS L2CM 7053, Fac Sci & Technol, BP 70239, F-54506 Vandoeuvre Les Nancy, France

[4] MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave,Off 1-382, Cambridge, MA 02139 USA

关键词: Emulsion;    Mixed-system;    Micellar structure;    Monolith;    Silica;    Hierarchical porosity;    Si(HIPE);    Sol-gel;    SAXS;   

DOI  :  10.1016/j.jcis.2018.08.068

来源: Elsevier

【 摘 要 】

Traditional porous monoliths Si(HIPE) (High Internal Phase Emulsion), prepared from the Tetradecyltrimethylammonium Bromide (TTAB)/dodecane/water system, offer high specific surface area, mainly due to microporosity. Aside, mesoporous materials SBA-15, prepared from Pluronic P123, have a high specific surface area, but are obtained as powder, which limits their applications. Starting from the mixed TTAB-P123 surfactant, it is expected to tune the mesoporosity of Si(HIPE), while keeping their monolithic character. The ternary TTAB/P123/water phase diagram was established by varying the weight ratio between these two surfactants. The micellar structure as well as the structural parameters of the liquid crystal domains were determined by SAXS (Small Angle X-ray Scattering). The effect of dodecane solubilization was also investigated and concentrated emulsions were formulated from the (P123/TTAB)/dodecane/ water systems. After this soft matter dedicated study, the acquired knowledge was transferred toward the hierarchical porous silica generations, where the sol-gel process is involved. Mixing P123 with TTAB, macro-mesoporous monolithic silica with an enhanced contribution of the specific surface area due to mesoporosity can be prepared. The variation of the TTAB/P123 weight ratio allows controlling the porosity at the mesoscale. Moreover, the macroporosity can be tuned by changing the preparation method, by mixing either the two micellar solutions or directly the two surfactants prior the emulsification process. (C) 2018 Elsevier Inc. All rights reserved.

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