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              <p>The shape of a liquid-air interface advancing on a heterogeneous surface was studied experimentally, together with the force induced by the pinning of the contact line to surface defects. Different surfaces were considered with circular defects introduced as arrays of cocoa butter patches or small circular holes. These heterogeneous surfaces were submerged into aqueous ethanol solutions, while measuring the additional force arising from the deformation of the advancing contact line and characterising the interface shape and its pinning on the defects. Initially, the submersion force is linear with submerged depth, suggesting a constant defect-induced stiffness. This regime ends when the contact line de pins from the defects. A simple scaling is proposed to describe the depinning force and the depinning energy. We find that, as the defect separation increases, the interface stiffness increases too, with a weak dependency on the defect radius. This interaction between defects cannot be captured by the simple scaling, but can be well predicted by a theory considering the interface deformation in presence of periodic arrays of holes. Creating a 4-phase contact line, by including solid defects (cocoa butter) reduced pinning forces. The radius of the defect had a nonlinear effect on the depinning depth. The 4-phase contact line resulted in depinning before the defects are fully submerged. These experimental results and the associated theory help understanding quantitatively the extent to which surface heterogeneities can slow down wetting. This in turn paves the way to tailor the design of heterogeneous surfaces, towards desired wetting performances.</p>
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