One-step transformation of a fluoro-based polymer into a superhydrophobic polymer composite

Abstract

We describe the formation of superhydrophobicsurfaces by controlling the surface roughness using some simple processing methods, such as annealing at 120 °C, freeze-drying at -40 °C and composite film preparation. The root-mean-square (rms) roughness and the water contact angle values of untreated poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12-heneicosaffluorododecyl acrylate) (PHFDA) film prepared on silicon substrate using spin-coating technique were about 1.35 nm and?A/?R= 125o/103o, respectively. On the other hand, the annealed film C and the freeze-dried film with only a small increase in the rms roughness and the water contact angle values were 2.05 nm and ?A/?R= 126o/111o, and 2.28 nm and?A/?R= 130o/123o, respectively. However, these values for the composite film composed of PHFDA and active carbon were 2.54 nm and ?A/?R= 165o/164o, respectively. This method can be applied to various surfaces as long as the composites composed of nanoparticles and polymeric materials do not cause any aggregation in spin-coating