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Rose Petal Effect
Rose petal effect is the ability of certain rough surfaces to have a high contact angle with water simultaneously with high adhesion (large contact angle hysteresis) with water.
Recent experimental findings and theoretical analyses made it clear that the early Wenzel  and Cassie and Baxter  models do not explain the complexity of interactions during wetting of a rough surface which can follow several different scenarios. As a result, there are several modes of wetting of a rough surface, and therefore, wetting cannot be characterized by a single number such as the contact angle (CA). Contact angle hysteresis (the difference between the advancing and receding CA) is another important parameter which characterizes wetting (Fig. 1).
Fig. 1 (a) Schematics of a droplet on a tilted substrate showing advancing (θadv) and receding (θrec) contact angles. The difference between