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Preparation and characterization of ultra porous cellulosic materials

Abstract : We have prepared new ultraporous materials, called Aerocellulose, from solutions of cellulose in N-Methyl-Morpholine-N-Oxide (NMMO) or in aqueous sodium hydroxide solution, followed by a regeneration step and a supercritical drying.
The rheological properties of cellulose-NaOH-water solutions were studied. Time, temperature and increase of cellulose concentration lead to the formation of an irreversible gel. The addition of urea delays gelation and increase the solvent quality.
We have determined the cellulose regeneration kinetics of physical gels and compared with the one found for cellulose-NMMO water solutions. Cellulose concentration, nature and temperature of the non-solvent bath are the main parameters that control the solvent diffusion from cellulose solution towards non-solvent regenerating bath and thus the final structure of the material.
Aerocellulose have an open porosity, superior to 90%, with a mean pore diameter around a few hundreds nanometres. The mechanical properties depend on preparation parameters.
Aerocellulose was evaluated for various applications. We have created composites of cellulose-inorganic particles. We have pyrolysed aerocellulose in order to obtain porous carbon structure. Carbonised Aerocellulose were successively tested in primary lithium battery and as catalyse support in proton exchange membrane fuel cell.
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Submitted on : Wednesday, September 19, 2007 - 5:21:05 PM
Last modification on : Wednesday, October 14, 2020 - 4:02:20 AM
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  • HAL Id : tel-00173409, version 1

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Roxane Gavillon. Preparation and characterization of ultra porous cellulosic materials. Mechanics [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2007. English. ⟨tel-00173409⟩

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