Hydrophilic and hydrophobic pores in reduced graphene oxide aerogel

Aerogel is obtained from graphene oxide reduced by a mixture of H3PO2 and I2. The porous structure of an aerogel has been studied at room temperature using the method of standard contact porosimetry. Both water and octane were used as working fluids, which allowed us to study the pore size distributions of hydrophilic and hydrophobic pores separately. It was found that very small pores, with the radius < 2.5 nm, and very large pores, with the radius more than 100 nm, were mostly hydrophobic, while the intermediate pores were hydrophilic.