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

Brunet, P.; Lapierre, F.; Zoueshtiagh, F.; Thomy, V.; Merlen, A.
December 2009
Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p254102
Academic Journal
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.


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