Abstract
Recent progress in the synthesis of nanostructured silica-based materials through the self-assembly process using well-designed alkoxysilane precursors is presented. Alkoxysilanes with covalently attached hydrophobic organic tails become amphiphilic when hydrolyzed to form silanol groups, leading to the formation of various mesostructures upon evaporation of solvents. The precursors having large oligosiloxane heads are particularly important because of their ability to form cylindrical assemblies, providing a direct pathway to ordered porous silica by removal of the organic groups. Our recent research includes (i) templated-synthesis of hierarchically ordered structures and (ii) design of molecules having chemically cleavable bonds to generate pores without calcination.
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Acknowledgments
This work was supported in part by a Grants-in-Aid for the 21st Century COE Program “Practical Nano-Chemistry” and the Global COE program “Practical Chemical Wisdom” from MEXT, Japan. K. K. also acknowledges the support by a Grant-in-Aid Scientific Research on Priority Areas “New Materials Science Using Regulated Nano Spaces, Strategy in Ubiquitous Elements” from MEXT, Japan. The A3 Foresight Program “Synthesis and Structural Resolution of Novel Mesoporous Materials” supported by the Japan Society for Promotion of Science (JSPS) is also acknowledged.
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Shimojima, A., Kuroda, K. Controlled synthesis of nanostructured silica-based materials from designed alkoxysilanes. J Sol-Gel Sci Technol 46, 307–311 (2008). https://doi.org/10.1007/s10971-007-1662-3
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DOI: https://doi.org/10.1007/s10971-007-1662-3