Abstract
The capability of droplet absorption into a funnel-like capillary tube is enormously affected by the combined influence of the droplet size, the opening angle, and the intrinsic wettability. Through a quantitative investigation of the penetration criteria, we demonstrate that a finite-volume droplet can be totally absorbed by a hydrophobic funnel-like structure depending on the opening angle. This result is sharply contrary to the previous conclusion for infinite-volume droplets in straight capillary tubes and our predictions extend the limit of the maximum contact angle for the complete penetration of droplets into capillary tubes in the literature.
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