Spray coating of superhydrophobic and angle-independent coloured films.

Angle-independent coloured films with superhydrophobicity were fabricated from quasi-amorphous arrays of monodispersed fluorinated silica nanoparticles via one-step spray coating. The film exhibited a high contact angle (>150 degrees) and a low roll-off angle (similar to 2 degrees) and the colour could be tuned to blue, green and moccasin by varying the size of the nanoparticles.