For centuries, pencils have been convenient implements for writing, drawing, and portraying. In this study, we found another use for the lowly pencil: to modulate the mobility of water droplets on a robust superhydrophobic surface. Here, we describe a simple method for fabricating durable superhydrophobic films from carbon nanotube (CNT)/polybenzoxazine coatings. These as-prepared coatings possessed robust superhydrophobicity with strong adhesion to glass and metal substrates. We achieved tunable water droplet mobility on the superhydrophobic surface with patterned wettability after drawing with a pencil. The mobility could be switched rapidly (within 1 min) between the poorly adhesive rolling state and the highly adhesive pinning state through sequential pencil drawing and sonication processes.
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