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Impact dynamics and rebound of water droplets on superhydrophobic carbon nanotube arrays
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Impact dynamics and rebound of water droplets on superhydrophobic carbon nanotube arrays