A toilless quasi-superhydrophobic surface of round cake, microsphere and spindle with high contact angle and high adhesion

The preparation of superhydrophobic polyurethane ?by fluorination poses a potential threat to the environment. Herein, we introduce a quasi-superhydrophobic surface with high water contact angle (CA) and high adhesion via eletrospraying. By regulation of concentration, voltage or flow velocity, various structures such as round cakes, microspheres and micro-spindles can be facilely fabricated. Also, the impact of these parameters on the CA is systematically analyzed. Furthermore, the obtained surface with the optimized preparation parameters exhibits a high contact angle, and the maximum value can reach 145?degrees, along with remarkable durability. Because of non-toxic addition, this method embodies the peculiarity of environment-friendly. Hence, it is highly promising that this quasi-superhydrophobic polyurethane via electrospraying will possess a broad application prospect, such as self-cleaning, oil-water separation, protective suit and so on.