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Depending on the contact line motion, colloid-rich drolets evaporation canleave a ring-like or a spot-like residue. Herein, we determine this outcome bycontrolling the contact line motion using coplanar direct currentelectrowetting-on-dielectrics (DC-EWOD). Combined with theoretical calculationsof the droplet shape and its evaporation rate, the time-dependent actuationvoltage is first derived from experiments and simulations. Thanks to theadditional control over the contact angle, the contact line can be maintainedin pinned state even on surfaces that exhibit little contact angle hysteresissuch as homogenous flat Teflon coatings. In the absence of EWOD control,polystyrene particles and Escherichia coli suspended in the droplet formed adot-like pattern at the center of the initial contact, whereas application ofthe mechanism resulted in ring-like patterns of a controllable radius. Unlikechemically or structurally patterned substrates, the contact line could recoverits mobility at any preset time before reaching the control limit, which isuseful to accurately and consistently fabricate self-assembled nanostructuresof desired patterns on different surfaces.

On-demand contact line pinning during droplet evaporation