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Article << Previous     |     Next >>   Contents Vol 63(3)

On the Superhydrophobic Properties of Crystallized Stearic Acid*

Kyle R. Joseph A, Chiara Neto A B

A School of Chemistry, The University of Sydney, NSW 2006, Australia.
B Corresponding author. Email: c.neto@chem.usyd.edu.au
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A surface coating formed by stearic acid (SA) crystals was prepared by repeatedly dipping a silicon substrate into a SA solution and drying it in air. Scanning electron microscopy imaging revealed that the surface roughness of the coating increases with each dip-and-dry cycle. The coating appears as a carpet of hydrophobic ‘blades’, and is superhydrophobic (after 20 dipping cycles advancing contact angle ~160°), even after immersion in water for up to 2 h. This simple method could be applied to large areas, making this an interesting alternative to high-tech surface modification techniques.

* This paper is based on work presented at the Australian Colloid and Interface Symposium, Adelaide, February 2009.
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