Abstract
This paper reports the synthesis of highly porous organic/inorganic hybrids by a two-step acid-base catalyzed sol-gel process and ambient pressure drying. In the method organic and inorganic precursors are copolymerized so as to incorporate organic ligands into the solid network. The two-step acid-base catalyzed process was used to prevent phase segregation during the hydrolysis and co-condensation of organic and inorganic precursors. The organic ligands incorporated into the solid gel network modify the surface chemistry. Thus, the wetting angle is significantly increased so that the collapse of the gel network is greatly reduced upon the removal of pore fluid during drying. Organic/inorganic hybrids with BET surface areas above 1250 m2/g, porosities above 75% and pore sizes of ∼8 nm have been synthesized.
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References
R.W. Pekala and L.W. Hrubesh, J. Non-Crystalline Solids 186 (1995).
R.W. Pekala, C.T. Alviso, F.M. Kong, and S.S. Hulsey, J. Non-Crystalline Solids 145, 90 (1992).
C.J. Brinker and G.W. Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, Inc., San Diego, CA, 1990).
F.A.L. Dullien, Porous Media, Fluid Transport and Pore Structure (Academic Press, New York, NY, 1979).
R. Deshpande, D.M. Smith, and C.J. Brinker, U.S. Patent Application, 1992.
D.M. Smith, R. Deshpande, and C.J. Brinker, in Better Ceramics Through Chemistry V, edited by M.J. Hampden-Smith et al. (MRS Symp. Series 271, Pittsburgh, PA, 1992), p. 567.
S.S. Prakash, C.J. Brinker, and A.J. Hurd, J. Non-Crystalline Solids 188, 46 (1995).
S.S. Prakash, C.J. Brinker, A.J. Hurd, and S.M. Rao, Nature 374, 439 (1995).
F. Schwertfeger, W. Glaubit, and U. Schubert, J. Non-Crystalline Solids 145, 85 (1992).
H. Yokogawa and M. Yokoyama, J. Non-Crystalline Solids 186, 23 (1995).
D.A. Loy, G.M. Jamison, B.M. Baugher, E.M. Russick, R.A. Assink, S. Prabakar, and K.J. Shea, J. Non-Crystalline Solids 186, 44 (1995).
W.G. Fahrenholtz, D.M. Smith, and D.W. Hua, J. Non-Crystalline Solids 144, 45 (1992).
W.G. Fahrenholtz and D.M. Smith, in Better Ceramics Through Chemistry V, edited by M.J. Hampden-Smith et al. (MRS Symp. Series 271, Pittsburgh, PA, 1992), p. 705.
G.M. Pajonk, A. Venkateswara Rao, B.M. Sawant, and N.N. Parvathy, J. Non-Crystalline Solids 209, 40 (1997).
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Cao, G., Tian, H. Synthesis of Highly Porous Organic/Inorganic Hybrids by Ambient Pressure Sol-Gel Processing. Journal of Sol-Gel Science and Technology 13, 305–309 (1998). https://doi.org/10.1023/A:1008616025269
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DOI: https://doi.org/10.1023/A:1008616025269