Nanopin film

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Nanopin film is an experimental material in

cones perpendicular to the surface. The surface is regarded as a composite material with mostly air and a small fraction constituted by the tops of the cones. When the contact angle of the cone material is sufficiently large, Cassie's law
predicts large contact angle values for the composite.

This particular nanopin film is produced with

°C for 24 hours in a chemical bath deposition to form a brucite type cobalt(II) hydroxide
layer with composition

CoOH1.13Cl0.09(CO3)0.39.0.05H20

The top coating is provided by lauric acid in a separate step. A 3 square micrometer surface now contains on average 166 such cones with cone height of around 100 nm, and the cone diameter at the tip is 6.5 nm. The Cassie's law prediction for this material with the lauric acid surface area contact fraction of 0.000612 and flat film contact angle of 75° is 177.8°.

See also

References

  1. J. Am. Chem. Soc.; 2005; 127(39) pp 13458 – 13459 Abstract Supporting info with pics
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