Figure 2.

Wetting behavior and time‐dependent contact angle evolution of the LM droplets under different excitations: a) acidic solution with no additional assistance; b) neutral solution assisted by an electrical polarization; c) alkaline solution assisted by an aluminum probe. The subfigure on the right side of each row shows the time‐dependent contact angle evolution. The inset of figure a‐iv schematically shows the measured contact angle θ during the nonwetting‐to‐wetting transition. Scale bars: 500 µm.