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Examples of superhydrophobic surfaces comprised of individual pores: (a) surface made of anodic alumina film coated with a hydrophobic polymer.27 (b) Electrospun polystyrene fiber.22
Force balance diagram in an axisymmetric coordinate system corresponding to the air–water interface over a circular pore.
(Color online) Calculated air–water interface at the critical hydrostatic pressures, over pores with (a) circular, (b) elliptical, (c) triangular, and (d) hexagonal cross-sections. Contour plots show the interface gradient value, . Contour values correspond to 0–0.6. The critical pressure is determined based on the value of .
Normalized critical pressure for a wide range of (a) polygonal and (b) elliptical pores all having identical cross-sectional areas.
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