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We experimentally observed the enhanced contact angle hysteresis (CAH) ofdilute aqueous salt solution on graphite surface, i.e., 40.6$^\circ$,34.6$^\circ$, and 27.8$^\circ$, for LiCl, NaCl, and KCl, indicating theeffective tuning of the CAHs by cations. Molecular dynamics simulations revealthat the preferential adsorption of cations on the HOPG surface due to thecation-{\pi} interaction pins the water at the backward liquid-gas-solidinterfaces, reducing the receding contact angle and hence enhancing the CAH.This finding provides a simple method to control the contact angle and the CAHof aqueous drops on graphitic surfaces such as graphene, carbon nanotube,biomolecules, and airborne pollutants.

Enhanced contact angle hysteresis of salt aqueous solution on graphite surface by a tiny amount of cation