Novel superhydrophobic cellulose coating and its multifunctional applications

초록

Recently, an increasing trend has been noticed towards synthesizing superhydrophobic surface with a water contact angle (WCA) higher than 150 degrees due to its many potential applications including water repellency, oil spill recovery, self-cleaning, antifouling, anti-icing-deicing and so on. Unfortunately, most of the cases the superhydrophobic surface was achieved utilizing either fluorinated materials or organic-inorganic nanoparticles as the water solid contact angle varies with the surface chemistry and roughness of the solid surface. Herein, we presented a novel approach for preparation of superhydrophobic coating without involving any such hazardous chemicals with the oath to create sustainable world. The superhydrophobic coating was prepared using cellulose nanofibers (CNFs) via a new one step surface modification process. The as-synthesized cellulose surface shows water contact angle (WCA) value of 161 degrees (+/- 2 degrees). When used this material to coat other substrates such as tissue paper, sponge and fabrics, etc., to test the water repellent capacity, the WCA values were found to be between 136-150 degrees (+/- 3 degrees) for the above surfaces. Moreover, the excellent durability of the coating made it very promising for efficient oil/water separation process to self-cleaning textile.

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