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To grate a liquid into tiny droplets by its impact on a hydrophobic microgrid

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5 Author(s)
Brunet, P. ; Institut d’Electronique de Microélectronique et de Nanotechnologies, UMR CNRS 8520, Cité Scientifique, Avenue Poincaré, BP. 60069, 59652 Villeneuve d’Ascq, France ; Lapierre, F. ; Zoueshtiagh, F. ; Thomy, V.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.3275709 

We report on experiments of drop impacting a hydrophobic microgrid of typical spacing a few tens of micrometers. Above a threshold in impact speed, liquid emerges to the other side, forming microdroplets of size about that of the grid holes. We propose a method to produce either a monodisperse spray or a single tiny droplet of volume as small as a few picolitres corresponding to a volume division of the liquid drop by a factor of up to 105. We also discuss the discrepancy of the measured thresholds with that predicted by a balance between inertia and capillarity.

Published in:
Applied Physics Letters  (Volume:95 ,  Issue: 25 )

Date of Publication: Dec 2009

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