Antimicrobial cellulose nanofibril porous materials obtained by supercritical impregnation of thymol
Résumé
This study presents the impregnation in supercritical carbon dioxide (scCO 2) of nanocellulose-based structures with thymol as a natural antimicrobial molecule to prepare bioactive biosourced materials. First, cellulose nanofibrils (CNFs) were used to produce four types of materials (nanopapers, cryogels from water or tert-butyl alcohol suspensions and aerogels) of increasing specific surface area up to 160 m 2 .g-1 thanks to the use of different processes, namely vacuum filtration, freeze-drying and supercritical drying. Secondly, these CNF-based structures were impregnated with thymol in scCO 2 medium using relatively low temperature and pressure of 40°C and 100 bars during 1 hour. The amount of impregnated thymol in the different CNF-materials was investigated by fluorescence spectroscopy, 13 C NMR analysis and gas
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