Influence of Gelation Conditions on the Porosity. In order to check the influence of gelation conditions on aerocellulose microstructure, the same initial solution, 5 cellulose/NaOH/water, was either gelled at 50 °C for 2 h or at ambient temperature for 24 h. Both samples were then regenerated in water at 25 °C with further solvent exchange water f acetone and then dried in CO2 in supercritical conditions. Table 3 summarizes the microstructural characteristics obtained for these two samples. It shows that gelation conditions practically do not affect the final characteristics of aerocellulose