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Nouveaux gels organiques et carbonés dérivés de composés phénoliques naturels et synthétiques

Abstract : This thesis describes new carbon gels that are much cheaper than their traditional counterparts derived from resorcinol - formaldehyde (RF) resin dried with supercritical CO2 before pyrolysis, but presenting similar features. Such result was obtained through two parallel routes: (1) the search for cheap precursors able to form chemical gels having suitable densities and mechanical properties; (2) the search for alternative drying methods, such as freeze-drying and supercritical drying with acetone or ethanol. After pyrolysis, new carbon cryogels and aerogels, respectively, were obtained. Half of the work presented here is thus based on the use of (flavonoid) mimosa tannins, which are cheap natural molecules. We show that tannins allow the preparation of highly porous carbons presenting much more versatile textural characteristics, but in some cases similar to those of materials derived from RF. The latter have a production cost five times higher than that of the tannin-based carbon aerogels reported here, which are definitely the cheapest of the market.
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  • HAL Id : tel-01746224, version 1

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Andrzej Szczurek. Nouveaux gels organiques et carbonés dérivés de composés phénoliques naturels et synthétiques. Autre. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10079⟩. ⟨tel-01746224⟩

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