Novel mesoporous silicates with two-dimensional mesostructure direction using rigid bolaform surfactants

Dongyuan Zhao, Qisheng Huo, Jianglin Feng, Jiman Kim, Yongjin Han, Galen D. Stucky

Research output: Contribution to journalArticleResearchpeer-review

118 Citations (Scopus)

Abstract

In this paper we describe how pore-structure modification can be achieved in a highly ordered fashion through the use of bolaform surfactants containing a rigid unit in the hydrophobic chain. The silicate mesophase, SBA-8, synthesized using bolaform surfactants at room temperature, is a two-dimensional (2-D) pore structure with a centered rectangular lattice (space group cmm, 1 < a/b < √3), which has no reported lyotropic liquid crystal analogue. SBA-8 is thermally stable in air, and the surfactant can be removed by calcination to yield a mesoporous material with a high surface area (> 1000 m2/g). The unit cell parameter of the silicate mesostructure can be varied by adding gemini surfactants or by changing reaction temperature; a 2-D silicate mesophase (Mα, a/b > √3) and high quality hexagonal MCM-41 (p6mm, a/b = √3) can be obtained. Hydrothermal transformation of SBA-8 into MCM-41 takes place, confirming the intermediate nature of the SBA-8 mesophase.

Original languageEnglish
Pages (from-to)2668-2672
Number of pages5
JournalChemistry of Materials
Volume11
Issue number10
DOIs
Publication statusPublished - 1 Jan 1999
Externally publishedYes

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