Preparation, properties and applications of novel cellulose and cellulose acetate aerogels - Energétique et procédés (DEP) Accéder directement au contenu
Communication Dans Un Congrès Année : 2009

Preparation, properties and applications of novel cellulose and cellulose acetate aerogels

Résumé

Novel various aerogel-like materials were prepared from the biomass, cellulose and cellulose derivatives, either from their solutions or via physical or chemical gelation and drying in CO2 under supercritical conditions. Two classes of materials will be discussed: based on pure cellulose and on cellulose acetate. Pure cellulose highly porous material, Aerocellulose, was made from cellulose dissolved in green solvents, aqueous NaOH or ionic liquids. An overview of the main preparation steps is given, from cellulose dissolution and solution-state properties, to regeneration kinetics, solvent exchange and drying. The porosity of Aerocellulose is higher than 90% with pore sizes from a few tens of nanometers to a few tens of micrometers. The density ranges from 0.06 to 0.3 g/cm3. Aerogels based on cellulose acetate were synthesised by crosslinking cellulose acetate dissolved in acetone with a non-toxic isocyanate as a cross-linker, using different catalysts (dibutyltin dilaurate, a triethylamine and pyridine). Mesoporous nanostructured network was obtained after drying; pore sizes vary from 10 to 30 nm and density from 0.25 to 0.85 cm3/g. Two applications of these new materials are discussed: as thermal insulators and carbons in proton exchange membrane fuel cell.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-00490283 , version 1 (08-06-2010)

Identifiants

  • HAL Id : hal-00490283 , version 1

Citer

Roxane Gavillon, Claudia Hildenbrand, Florent Fischer, Romain Sescousse, Arnaud Rigacci, et al.. Preparation, properties and applications of novel cellulose and cellulose acetate aerogels. BIOFOAMS 2009, Oct 2009, Niagara Falls, Canada. Paper no 7 - 6 p. ⟨hal-00490283⟩
262 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More