Anionic surfactant-templated mesoporous

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. 

Mesoporous zirconia has been prepared using anionic surfactants containing reactive oxygens that could bind Zr2+ (224-226). Mesoporous zirconia was obtained using alkyl phosphate amphiphiles but they were not stable to template removal. 

In the S I+ direct-synthesis pathway, anionic surfactants are used as templates for mesoporous metal oxides. For example, C12H25OSOT Na+ (SDS) as template for A1203 and Ga203 mesoporous materials with Ali3[A104Ali2(0H)24(H20)i27+] and Gai3-Keg-gin [Ga04Ali2(0H)24(H20)127+] as A1 and Ga source, respectively.11841... 

The surfactant templated synthesis of mesoporous ceramics was first reported in 1992 [1], and since that time there has been a veritable explosion in the number of papers in the area. There has been particular interest in the functionalization of mesoporous ceramics [2-S]. As outlined in Figure 1, the original synthesis employed rod-shaped micelles composed of cationic surfactant molecules as the pore template (more recently, this methodology has been extended to a wide variety of other surfactant systems and reaction conditions). When exposed to routine sol-gel conditions, the cationic micelles undergo an anionic metathesis with silicate anions, resulting in a glass-coated log which... 

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. 

El Hanlrari, S., Bouhaouss, A., and Hesemann, P. (2013) Anionic surfactants as versatile soft-templates to access nanostructured ionosihcas from functional amine and ammonium precursors. Microporous Mesoporous Mater, 180,196 208. 

Zeolitic structures with pore sizes of 2000 to 10000 pm are known as mesoporous solids, and can be formed by a method known as liquid crystal templating (LCT). The combination of a suitable cationic surfactant together with silicate anions form arrays of rod-like surfactant micelles (Figure 3.7) surrounded by a polymeric siliceous framework. On calcination the mesoporous structure is formed. 

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