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Water contact angles and SEM images of polished graphite sheet (a), (b); hydrophobic graphite surface obtained by peeling (c), (d); and superhydrophobic graphite surface by further ultrasonication (e),(f).
Residual and newly attached air bubbles on polished graphite surface (a), (b); hydrophobic graphite surface obtained by peeling (c), (d); and superhydrophobic graphite surface by further ultrasonication (e), (f).
Convective Ostwald ripening on a superhydrophobic graphite surface. (a) Growth of an air bubble by absorbing tiny bubbles away from it. (b) Shrinkage of an air bubble by suction through a syringe away from it. Contact line pinning is clearly observed because of constant base diameter (BD).
The extent of contact angle hysteresis implying the adhesive performance is demonstrated by a drop clinging to the vertical wall, including (a) polished, (b) hydrophobic, and (c) superhydrophobic surfaces. The clinging drop with the maximum volume before sliding is given.
The variation of the advancing and receding contact angles with the contact time on a superhydrophobic graphite surface. The dynamic behavior of reveals the aging effect of the adhesive force.
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