Dissipative particle dynamics simulation of contact angle hysteresis on a patterned solid/air composite surface

have studied two types of topological substrates-the continuous solid substrates (CSS) and the discontinuous solid substrates (DSS)-by using the dissipative particle dynamics (DPD) method for a better understanding of the contact angle hysteresis on two such substrates. After the validation of DPD in the system, we found that DSS has a different distribution of the metastable states from that of CSS and that DSS has relatively larger contact angle hysteresis at lower temperature. Obtained results also show that CSS is more suitable for making an ultrahydrophobic or ultralyophobic surface than DSS from the point of view of dynamic wettability.