Authors
Renaud Dufour, Philippe Brunet, Maxime Harnois, Rabah Boukherroub, Vincent Thomy, Vincent Senez
Publication date
2012/4/23
Journal
Small
Volume
8
Issue
8
Pages
1229-1236
Publisher
WILEY‐VCH Verlag
Description
When a drop sits on a highly liquid‐repellent surface (super‐hydrophobic or super‐omniphobic) made of periodic micrometer‐sized posts, its contact‐line can recede with very weak mechanical retention providing that the liquid stays on top of the microsized posts. Occurring in both sliding and evaporation processes, the achievement of low‐contact‐angle hysteresis (low retention) is required for discrete microfluidic applications involving liquid motion or self‐cleaning; however, careful examination shows that during receding, a minute amount of liquid is left on top of the posts lying at the receding edge of the drop. For the first time, the heterogeneities of these deposits along the drop‐receding contact‐line are underlined. Both nonvolatile liquid and particle‐laden water are used to quantitatively characterize what rules the volume distribution of deposited liquid. The experiments suggest that the dynamics of the liquid …
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