Wetting of carbon nanotube functionalised nylon and its usage as flexible electrode in electrowetting on dielectric

The nylons functionalised with single walled carbon nanotubes (SWCNTs) at pH 2.5 and 3.5 display the time dependence of the water droplet contact angle, which is attributed to the adsorption of water molecules onto the nylon-water contact surface and the consequent increase in surface free energy. The contact angle of nylons functionalised at pH 4.5, 6.5 and 8.0 varies marginally with contact time, presumably owing to the presence of a large amount of SWCNTs on the nylon surface. Using the obtained nylon as a flexible electrode, an electrowetting on a dielectric system is designed. The contact angle decreases with the increase of the applied voltage and the electrowetting response is sensitive to the surface free energy of the water droplet. A low surface free energy is preferable for actuating the movement of the water droplet at a low-driving voltage.