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The stability of thin liquid films on a surface depends on the excess freeenergy of the system involving various short-range and long-range interactions.In an unstable condition, thin liquid films may dewet into multiple small-sizeddroplets via spinodal, homogeneous, or heterogeneous nucleation process.However, if the total excess free energy of the system can be manipulated usingan external stimulus, one can control the stability of thin liquid films ondemand. Here, we study the reversible dewetting process of thin lubricatingfilms underneath aqueous drops on slippery surfaces using an external electricfield. Upon applying voltage, stable thin lubricating films dewet in a manneridentical to the spinodal dewetting of nanometer-thick liquid films. Uponremoving the applied voltage, the dewetted droplets spread, coalesce withneighboring ones, and form a uniform film again, however the time taken duringrewetting is very different compared to dewetting. The characteristic featuresof both the dewetting and rewetting processes are present over multiple cycles.Due to the random nature of the spinodal dewetting process, the final dewettingpattern does not show any correlation over multiple dewetting cycles.

Reversible Dewetting of Thin Lubricating Films Underneath Aqueous Drops Using External Electric Field