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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.
(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.
The convective Ostwald ripening between two adhered bubbles on a Teflon film. A sequence of pictures showing large bubble growth and small bubble shrinkage.
The variation of the volumes of a large and a small bubbles with time, and .
A plot of against time at various surface tensions in terms of critical micelle concentration.
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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