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Article Dans Une Revue The European Physical Journal. Special Topics Année : 2013

Droplet actuation induced by coalescence: experimental evidences and phenomenological modeling

Résumé

This paper considers the interaction between two droplets placed on a substrate in immediate vicinity. We show here that when the two droplets are of different fluids and especially when one of the droplet is highly volatile, a wealth of fascinating phenomena can be observed. In particular, the interaction may result in the actuation of the droplet system, i.e. its displacement over a finite length. In order to control this displacement, we consider droplets confined on a hydrophilic stripe created by plasma-treating a PDMS substrate. This controlled actuation opens up unexplored opportunities in the field of microfluidics. In order to explain the observed actuation phenomenon, we propose a simple phenomenological model based on Newton's second law and a simple balance between the driving force arising from surface energy gradients and the viscous resistive force. This simple model is able to reproduce qualitatively and quantitatively the observed droplet dynamics.
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Dates et versions

hal-00724074 , version 1 (17-08-2012)
hal-00724074 , version 2 (18-08-2012)

Identifiants

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Mathieu Sellier, Volker Nock, Cécile Gaubert, Claude Verdier. Droplet actuation induced by coalescence: experimental evidences and phenomenological modeling. The European Physical Journal. Special Topics, 2013, 219, pp.131-141. ⟨10.1140/epjst/e2013-01788-0⟩. ⟨hal-00724074v2⟩
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