Design of Ordered Bimodal Mesoporous Silica Materials by Using a Mixed Fluorinated-Hydrogenated Surfactant-Based System
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- 作者：F. Michaux ; J. L. Blin ; M. J. Sté ; bé
- 刊名：Langmuir
- 出版年：2007
- 出版时间：February 13, 2007
- 年：2007
- 卷：23
- 期：4
- 页码：2138 - 2144
- 全文大小：582K
- 年卷期：v.23,no.4(February 13, 2007)
- ISSN：1520-5827
文摘
Mesoporous silica materials have been prepared using aqueous solutions of hydrogenated-fluorinated surfactantmixtures. The phase behavior of the C18H35(OC2H4)10-C6F15C2H4(OC2H4)11OH [RH18(EO)10-RF6(EO)11] mixture inaqueous solution was first established at the temperature at which the silica source is added, i.e., 20 or 40 
f">C. Wehave delimited the different phase domains. Concerning the mesostructured silica, whatever the temperature at whichthe silica source is added, mesoporous material with a hexagonal array of their channel is formed via a cooperativetemplating mechanism (CTM), if the content of RF6(EO)11 in the surfactant mixture is lower than 50%. Moreover,when the silica source is added at 40 f">C, the recovered materials exhibit a bimodal pore size distribution. Theappearance of this bimodality has been related to the coexistence of hydrogenated micelles with fluorinated wormlikemicelles. By contrast, the bimodality is not observed when the silica source is added at 20 f">C.
f">C. Wehave delimited the different phase domains. Concerning the mesostructured silica, whatever the temperature at whichthe silica source is added, mesoporous material with a hexagonal array of their channel is formed via a cooperativetemplating mechanism (CTM), if the content of RF6(EO)11 in the surfactant mixture is lower than 50%. Moreover,when the silica source is added at 40 f">C, the recovered materials exhibit a bimodal pore size distribution. Theappearance of this bimodality has been related to the coexistence of hydrogenated micelles with fluorinated wormlikemicelles. By contrast, the bimodality is not observed when the silica source is added at 20 f">C.