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Issue 16, 2006
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Anionic surfactant induced mesophase transformation to synthesize highly ordered large-pore mesoporous silica structures

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Abstract

Successive mesophase transformation induced by an anionic surfactant such as sodium dioctyl sulfosuccinate (AOT) has been demonstrated to fabricate four kinds of large pore mesoporous silica materials in a triblock copolymer F127 surfactant assembly system. The transformation of the highly ordered mesostructures from face-centered cubic (space group Fm[3 with combining macron]m) to body-centered Im[3 with combining macron]m then towards two-dimensional (2-D) hexagonal p6m and eventually to cubic bicontinuous Ia[3 with combining macron]d symmetries has been achieved by tuning the amount of AOT and 1,3,5-trimethylbenzene (TMB). Characterization by small-angle X-ray scattering (SAXS), powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 sorption isotherms reveals that all mesoporous silica structures have highly ordered regularity in large domains and possess high surface areas, large pore volumes and uniform pore sizes. The expansion of hydrophobic volume in the amphiphilic Pluronic F127 surfactant associated with AOT and TMB molecules in an acidic media is attributed to the observed mesophase transformation. A further swelling of the surfactant micelles can be achieved by adding TMB molecules into the mixed AOT and F127 surfactants system due to their synergistic solubility enhancement, which gives rise to a long-range ordered 2-D hexagonal mesoporous silica structure with very large cell parameter (a = 16.5 nm) and pore size (∼12 nm). The understanding of the blend–surfactant assembly mechanism will lead to a more rational approach for economical and large-scale production of mesoporous materials with controllable structures.

Graphical abstract: Anionic surfactant induced mesophase transformation to synthesize highly ordered large-pore mesoporous silica structures

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Publication details

The article was received on 19 Dec 2005, accepted on 21 Feb 2006 and first published on 09 Mar 2006


Article type: Paper
DOI: 10.1039/B517975K
J. Mater. Chem., 2006,16, 1511-1519

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    Anionic surfactant induced mesophase transformation to synthesize highly ordered large-pore mesoporous silica structures

    D. Chen, Z. Li, Y. Wan, X. Tu, Y. Shi, Z. Chen, W. Shen, C. Yu, B. Tu and D. Zhao, J. Mater. Chem., 2006, 16, 1511
    DOI: 10.1039/B517975K

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