Bing Tan et al 2005 Nanotechnology 16 S502 doi:10.1088/0957-4484/16/7/026
Bing Tan1, Hans-Joachim Lehmler2, Sandhya M Vyas2, Barbara L Knutson1 and Stephen E Rankin1,3
Show affiliationsA cationic partially fluorinated surfactant with four carbons in the chain 1-(3,3,4,4,4-pentafluorobutyl)pyridinium chloride is employed as a structure-directing agent to synthesize nanoporous silica. Samples are prepared in dilute ammonia solutions at room temperature with a range of surfactant:Si ratios. The sample with the largest surfactant:Si ratio forms particles with wormhole-like micropores with an average diameter of 1.6 nm, which corresponds to the anticipated small size of the surfactant aggregates. On the other hand, the sample with the smallest surfactant:Si ratio forms a gel that, upon drying, has uniform 11.1 nm pores. The formation and stabilization of the latter large-mesopore structure is unusual for a sample prepared and dried under ambient conditions, and may reflect favourable roles of the surfactant both in inducing gelation and in stabilizing the pore structure during drying.
81.07.-b Nanoscale materials and structures: fabrication and characterization
81.05.Rm Porous materials; granular materials
Soft matter, liquids and polymers
Condensed matter: structural, mechanical & thermal
Issue 7 (July 2005)
Received 30 November 2004, in final form 6 April 2005
Published 18 May 2005
Bing Tan et al 2005 Nanotechnology 16 S502
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