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Tiny bubble removal by gas flow through porous superhydrophobic surfaces: Ostwald ripening
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View: Figures


Image of FIG. 1.
FIG. 1.

The typical gas bubble shapes on a glass surface with and on a Parafilm-covered surface with . The volume of the bubble is about and can be well represented by a spherical cap.

Image of FIG. 2.
FIG. 2.

(a) The scanning electron microscopy images of Teflon tape as porous superhydrophobic films. The images (scale ) illustrate the rough surface and porous structure. (b) The contact angle exceeds 150° for a water droplet on the porous film but is about 110° for a bubble adhered on the film immersed in water.

Image of FIG. 3.
FIG. 3.

The convective Ostwald ripening between two adhered bubbles on a Teflon film. A sequence of pictures showing large bubble growth and small bubble shrinkage.

Image of FIG. 4.
FIG. 4.

The variation of the volumes of a large and a small bubbles with time, and .

Image of FIG. 5.
FIG. 5.

A plot of against time at various surface tensions in terms of critical micelle concentration.

Image of FIG. 6.
FIG. 6.

The growth of an existing bubble on the porous, hydrophobic surface (Teflon tape) and on the smooth hydrophobic surface (Parafilm) under supersaturation condition.


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Scitation: Tiny bubble removal by gas flow through porous superhydrophobic surfaces: Ostwald ripening