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Control of the swelling, chemical functionalization, and adhesivity ofhydrogels are finding new applications in a wide range of material systems. Weinvestigate experimentally the effect of adsorbed particles on hydrogels on thedepinning of contact lines. In our experiments, a water drop containingpolystyrene microspheres is deposited on a swelling hydrogel, which leads tothe drop absorption and particle deposition. Two regimes are observed: adecreasing drop height with a pinned contact line followed by a recedingcontact line. We show that increasing the particles concentration increases theduration of the first regime and significantly decreases the total absorptiontime. The adsorbed particles increase the pinning force at the contact line.Finally, we develop a method to measure the receding contact angle with theconsideration of the hydrogel swelling.

Tuning the receding contact angle on hydrogels by addition of particles