Influence of surfactants on porous properties of carbon cryogels prepared by sol-gel polycondensation of resorcinol and formaldehyde

被引:28
作者
Tonanon, N [1 ]
Tanthapanichakoon, W
Yamamoto, T
Nishihara, H
Mukai, SR
Tamon, H
机构
[1] Chulalongkorn Univ, Fac Engn, Dept Chem Engn, Bangkok 10330, Thailand
[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan
[3] Kyoto Univ, Grad Sch Engn, Dept Chem Engn, Kyoto 6158510, Japan
基金
日本学术振兴会;
关键词
porous carbon; pyrolysis; adsorption; scanning electron microscopy; porosity;
D O I
10.1016/S0008-6223(03)00422-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The role of surfactants on carbon cryogels is investigated by using three different surfactants, nonionic (SPAN80), cationic (trimethylstearylammonium chloride; C18) and nonionic polymeric fluorinated (FC4430) surfactants. By using different SPAN80 concentrations (10.0, 5.0, 2.5, 1.0 and 0.5 vol.%), double-structure carbon microspheres with S-BET (630-700 m(2)/g) and V-mes (0.51-0.93 cm(3)/g) are obtained. Mesoporous carbon cryogels with different S-BET and V-mes are prepared by using C18 with different volume ratios of cyclohexane to water in a C18/water/cyclohexane mixture. Carbon cryogels with S-BET (690-810 m(2)/g) and V-mes (0.83-1.74 cm(2)/g) are obtained when cyclohexane is contained in the mixture, on the contrary, ( when there is no cyclohexane in the mixture, a water-based carbon cryogel with low S-BET (480m(2)/g) and V-mes(0.29 cm(3)/g) is obtained. Carbon cryogels prepared by using C18 have larger mesopore size and broader mesopore size distribution compared with carbon cryogels prepared by using other surfactants. Microcellular (sponge-like) carbon cryogels with 2 3 mesoporous surface, S-BET (210-660 m(2)/g) and V-mes (0.37-0.92 cm(3)/g), are obtained by introducing FC4430 (two concentrations) to two starting RF solutions (C/W=6,45). Low FC4430 concentration leads to carbon cryogels with higher 2 S., (610 and 660 m(2)/g) and narrower mesopore size distributions compared to the high concentration counterpart. Hence, it is found that different surfactant types have interesting effects on morphologies and porous properties of RF carbon cryogels. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2981 / 2990
页数:10
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