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Communication Dans Un Congrès Année : 2013

New families of carbon gels based on natural resources

Andrzej Szczurek
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Vanessa Fierro
Alain Celzard

Résumé

Carbon gels are versatile materials which can be used for many applications. They are extremely expensive, because generally prepared from resorcinol - formaldehyde (RF) resins first gelled and next dried with supercritical carbon dioxide. In the present work, resorcinol has been substituted partly or completely by tannins, a family of molecules extracted from mimosa tree barks. Tannins are natural, non-toxic products, typically thirty times cheaper than resorcinol. Their chemical resemblance with the latter makes them be often called natural resorcinol. Using tannins not only substantially decreases the cost but also allows preparing materials in a much wider range of pHs than that usually employed for RF gels. Consequently the main pore size and the fraction of given families of pores, controlling the carbon gels' properties, are tuned in an easier way, and a much wider range of pore structures is obtained. Finally, two alternative ways of drying are suggested for further decreasing the cost: freeze-drying and supercritical drying in acetone. Both are shown to lead, in some conditions described below, to materials having similar characteristics to those of expensive RF carbon aerogels previously dried in supercritical CO2.
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Dates et versions

hal-01296298 , version 1 (08-12-2016)

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Andrzej Szczurek, Gisele Amaral-Labat, Vanessa Fierro, Antonio Pizzi, Alain Celzard. New families of carbon gels based on natural resources. NAMES10: NEW ACHIEVEMENTS IN MATERIALS AND ENVIRONMENTAL SCIENCES, Oct 2010, Nancy, France. ⟨10.1088/1742-6596/416/1/012022⟩. ⟨hal-01296298⟩
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