Optical Tweezers @LaFSI
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Deviation of viscous drops at chemical step
Our work in the front cover of the Journal Soft Matter <...Read more ...

Deviation of sliding drops at chemical step


Il Lafsi festeggia la sua prima copertina!! Congratulazioni a Daniele, Matteo e Ciro per la bella immagine che apre il numero 40 del 28 ottobre 2016 di Soft Matter. Un grazie anche agli altri autori: Silvia, Luca, Martin e Giampaolo per il contributo in questo lavoro
L'articolo "Deviation of viscous drops at chemical step" è disponibile al link: Vedi articolo su rcs.org
Abstract: In this article, we present a joint experimental and numerical study of the interaction of gravity-driven drops with a chemical step formed at the junction between a hydrophilic and a hydrophobic region. It demonstrates the strong impact of a contact angle hysteresis contrast on the motion of drops at a linear chemical step. Surprisingly, the smallest driving force required to drag the drop across the step onto the lower hydrophobic surface is not observed at a right angle of incidence. Our model reveals that the non-monotonous response of this passive drop ‘filter’ is solely due to the higher advancing contact angle on the lower surface, and creates an instance where drop motion is affected by dissipation at the contact line rather than by surface energy.
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