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In this paper, the pinning and depinning mechanism of the contact line duringdroplet evaporation on chemically stripe-patterned surfaces is numericallyinvestigated using a thermal multiphase lattice Boltzmann (LB) model withliquid-vapor phase change. A local force balance in the context of diffuseinterfaces is introduced to explain the equilibrium states of droplets onchemically patterned surfaces. It is shown that, when the contact line ispinned on a hydrophobic-hydrophilic boundary, different contact angles can beinterpreted as the variation of the length of the contact line occupied by eachcomponent. The stick-slip-jump behavior of evaporating droplets on chemicallypatterned surfaces is well captured by the LB simulations. Particularly, a slowmovement of the contact line is clearly observed during the stick (pinning)mode, which shows that the pinning of the contact line during dropletevaporation on chemically stripe-patterned surfaces is actually a dynamicpinning process and the dynamic equilibrium is achieved by the self-adjustmentof the contact lines occupied by each component. Moreover, it is shown that,when the surface tension varies with the temperature, the Marangoni effect hasan important influence on the depinning of the contact line, which occurs whenthe horizontal component (towards the center of the droplet) of the forcecaused by the Marangoni stress overcomes the unbalanced Young's force towardsoutside.

Pinning-depinning mechanism of the contact line during evaporation on chemically patterned surfaces: A lattice Boltzmann study