期刊
BIOMASS & BIOENERGY
卷 56, 期 -, 页码 437-445出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2013.06.001
关键词
Xerogels; Tannin; Surfactant; Porous structure; Gel point
资金
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster)
- French Foreign Ministry (MAE)
- Region Lorraine
Highly porous organic materials have been obtained from the gelation of a tannin-based resin at different pHs in the presence of F-127 Pluronic (R) surfactant. After subcritical drying in ambient conditions, and without the need of any solvent exchange step, the resultant xerogels had bulk densities typical of most organic aerogels. Their porous structures revealed unique features, depending on the initial pH, such as the possibility of getting either purely macroporous materials with narrow pore size distributions, or bimodal textures having a significant amount of mesoporosity. Correlations between porous texture and gelation time were clearly evidenced. On top of being easy to prepare, these xerogels are based on a cheap, renewable and abundant resource making them valuable precursors of porous carbon materials for a broad range of applications. (C) 2013 Elsevier Ltd. All rights reserved.
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