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. 2015 Dec 14;5:18150. doi: 10.1038/srep18150

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(a,c) The contact angle (θ) of the droplets as a function of R_LSV on Ag and Al. Cryo-SEM images of sessile water droplets (tilted-view) and an optical image of the macroscopic droplet (side-view) are displayed in the a and c insets. (b,d) Plot of cos(θ) versus 1/R_LSV of the droplets on Ag and Al, respectively.