Figure 2.

(a) Photograph of wax-coated paper. (b) Photograph of cellulose paper whose right half is coated with amine functionality and the left half is untreated. In the untreated region, the water droplet spreads due to high surface tension. In the amine-functionalized region, the water droplet maintains a higher contact angle. (c) Schematic of randomly oriented plasma polymerized film bonded through the hydroxyl group of the cellulose fiber.