Anionic surfactant-templated mesoporous silica

The AMS (anionic surfactant-templated mesoporous silicas) materi-aisi30,i40,i42 family of well-ordered organosilicas prepared using anionic... 

Scheme 16.6 Ionic interactions between anionic surfactant and cationic costructuredirecting agent (CSDA) in the synthesis of anionic surfactant template mesoporous silica (AMS). (Adapted from Ref. [100].)...

S. Che, A.E. Garcia-Bennett, T. Yokoi, K. Sakamoto, H. Kunieda, O. Terasaki, and T. Tatsumi, A Novel Anionic Surfactant Templating Route for Synthesizing Mesoporous Silica with Unique Structure. Nature Mater. (London), 2003, 2, 801-805. 

O., and Tatsumi, T. (2003) A novel anionic surfactant templating route for synthesizing mesoporous silica with unique structure. Nat. Mater., 2, 801-805. 

Che, S., Garcia-Bennett, A.E., Yokoi, T., Sakamoto, K., Kunieda, H., Terasaki, O., and Tatsumi, T. (2003) A novel anionic surfactant templating route for synthesizing mesoporous silica with unique structure. Nat. Mater., 2 (12), 801-805. 

In basic solution (pH >10), the silicate ion is anionic. The simplest method is the use of a cation template (e.g., cationic surfactant) to organize these silicate ions. This interaction (synthesis pathway), S I, was applied in the classical synthesis of mesoporous silica in basic media. 

In general, the procedures used for the preparation of mesoporous materials are similar to those utilized in the synthesis of zeolites except that a surfactant instead of an inorganic cation or base is used as the template. Mesoporous materials (e.g., mesoporous silica) are prepared under room temperature or mild hydrothermal conditions (typically below 150°C) in the presence of anionic, cationic, or neutral surfactants, in either basic or acidic conditions. 

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