METHOD OF PREPARING A NANO- AND/OR MICROSCALE CELLULOSE FOAM

摘要

The present invention relates to a method for the preparation of a nano- and/or microscale cellulose-based foam. The method comprises the steps of (i) providing a suspension (1) comprising nano- and/or microscale cellulose in an aqueous medium, (ii) simultaneously cooling and agitating the suspension (1) in a mechanical step (2a; 2b) to obtain an at least partially frozen suspension, (iii) freezing the at least partially frozen suspension (5) to obtain a substantially frozen suspension, (iv) treating the suspension under solvent- exchange (7; 8) and (v) removing the solvent (10; 13) to obtain a substantially dry foam (40A) comprising nano- and/or microscale cellulose.