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. 2021 Oct 7;12:100145. doi: 10.1016/j.mtbio.2021.100145

Fig. 2.

Fig. 2

Interfacial virus retention. (a) SEM images showing the coatings consisting of SiO2 nanoparticles (SHP and SAP SiO2), soot-templated fractal SiO2 network (SOP SiO2), TiO2 nanoparticles (SHP TiO2), CuO nanoflakes (SHP CuO), and Ag nanocrystals (SHP Ag). (b) Chronophotographs showing six rebounds of a 5 ​μl SARS-CoV-2-laden droplet liberating from a height of ∼9 ​mm on the underlying SOP SiO2 surface. (c) SARS-CoV-2-laden droplets have a large contact angle θapp (>150°) and a low roll-off angle θroll-off (<5°) for different coating–substrate pairs, but the adhesions F⊥ scatters much. Solid and open circles, respectively, denote θapp and θroll-off. Columns denote the vertical liquid/solid adhesion F⊥. Error bar denotes standard deviation of three independent experiments. (d) The SARS-CoV-2 remnant N grows exponentially as F⊥ increases.