Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science

On the Superhydrophobic Properties of Crystallized Stearic Acid*

Kyle R. Joseph A and 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

Australian Journal of Chemistry 63(3) 525-528 http://dx.doi.org/10.1071/CH09292
Submitted: 15 May 2009  Accepted: 2 October 2009   Published: 26 March 2010


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.

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