Porosity of resorcinol-formaldehyde organic and carbon aerogels exchanged and dried with supercritical organic solvents

- First use of supercritical ethanol for preparing RF organic and carbon aerogels.
- Exchanging water of RF hydrogels by acetone or ethanol has low effect on porosity.
- Supercritical acetone and ethanol lead to similar materials only at low dilution.
- At high dilution, acetone leads to much higher pore volumes than ethanol does.
- Acetone is as good as CO2 for supercritical drying of RF gels.