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(Color online) Snapshots of a water droplet impacting the surface of a carbon nanotube array. The static contact angle of the nanotube array was 163°. The impact velocity just prior to the droplet striking the surface was . The following snapshots show the deformation time history of the droplet upon impact. The droplet spreads, then retracts, and finally rebounds off the surface.
(Color online) Snapshots of a water droplet impacting on the surface of a nanotube array with an initial static contact angle of 140°. The impact velocity in this case was . For this case the droplet does not rebound off the surface; it gets pinned to the substrate and pulsates.
(Color online) Time history of the droplet dynamic contact angle is plotted for the droplet impinging on the 140° and 163° contact angle arrays. The impact velocity for both cases is . During the droplet spreading phase, the advancing contact angle for the two surfaces is nearly identical; however, the receding contact angle (for ) is significantly smaller for the 140° array compared to the 163° array.
(Color online) Normalized contact line length is plotted vs time for droplets impinging on 140° and 163° static contact angle arrays with a velocity of . During the advancing phase the contact line length is nearly identical for the two cases, however, during the retraction phase the contact line for the droplet on the 140° array becomes pinned, while the droplet on the 163° array retracts and then rebounds off the surface.
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