Silica gel with continuous macropores prepared from water glass in the presence of poly(acrylic acid) |
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Authors: | Akiyuki Yachi Satoshi Sato Koichi Oguma Naoki Mikami |
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Institution: | a Department of Applied Chemistry, Faculty of Engineering, Chiba University, 1-33, Yayoi, Inage, Chiba 263-8522, Japan b Tokuyama Corp., 1-1, Mikage, Shunan, Yamaguchi 745-8648, Japan |
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Abstract: | Monolithic silica gel with macropores was prepared in the solution of water glass and polyacrylic acid (HPAA) by freezing transitional structures of phase separation. In the system, phase separation proceeds between silica polymers and HPAA, so that the porous morphology varies from closed macropores to particle aggregates through bicontinuous morphology, where both macropores and silica skeleton are three-dimensionally interconnected, with increasing HPAA/silica ratio. In addition, we can control the macropore size in bicontinuous morphology by varying the concentration of both silica and HPAA, or by changing the molecular weight of HPAA. The pore size distribution is quite sharp indicating the presence of pores with the same size all through the monolithic samples. |
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Keywords: | S310 P300 P120 |
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