After stirring for 5 h, 15 ml of ethanol was added in it and again stirred for
overnight. A final coating solution was prepared by mixing 1, 2 and 3 ml of solution A in
10 ml of solution B and named as RB-1, RB-2 and RB-3, respectively. The glass substrates were
immersed in the coating solution and kept in slanted position for 12 h. Finally, the coatings
were dried at room temperature for 6 h and at 75 1C for 2 h. A picture of raspberry fruit for
comparison purpose is shown in Fig. 1a. The prepared coating showed raspberry-like microstructure
(Fig. 1b) as well as superhydrophobic wetting state (Fig. 1c).