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We report on experiments of drop impacting a hydrophobic micro-grid, oftypical spacing a few tens of $\mu$m. Above a threshold in impact speed, liquidemerges to the other side, forming micro-droplets of size about that of thegrid holes. We propose a method to produce either a mono-disperse spray or asingle tiny droplet of volume as small as a few picoliters corresponding to avolume division of the liquid drop by a factor of up to 10$^5$. We also discussthe discrepancy of the measured thresholds with that predicted by a balancebetween inertia and capillarity.

To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid