Synthesis of hydrophobic and hydrophilic TiO2 nanofluids for transformable surface wettability and photoactive coating.

Two modified TiO2 nanofluids were developed, with either hydrophobic or hydrophilic properties. The hydrophobic TiO2 nanofluid, embedded in an organo-silyl salt, could be transformed into a hydrophilic TiO2 nanofluid by exchange of the chloride with an organo-sulphonate ion. Both modified TiO2 nanofluids exhibited high fluidity, thermal stability and photoactivity.