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. 2021 Mar 5;7(10):eabf0452. doi: 10.1126/sciadv.abf0452

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Fig. 2 — The water droplet impacting on the mask surface has a We~880 and is recorded at 20,000 frames per second (fps). (A to C) Time sequence images of droplet impingement on a single-, double-, and triple-layer mask, respectively. The total number count of atomized droplets is significantly higher for the single-layer mask in comparison with the double-layer mask, while only a single droplet penetrates through the triple-layer mask see (C), at t = 600 to 1000 μs]. Similar results are obtained for mask B (see fig. S4). Scale bar description is included in the figures.