Fig. 4. Plot of the contact angle CA of a water droplet in air showing the different wettabilities on the ZnO-Nrd coated and uncoated substrates. The ZnO-Nrd coated substrates showed extreme wettability properties: the ZnO-Nrd coated glass showed superhydrophilic properties while the ZnO-Nrd coated PDMS showed superhydrophobic properties.
