Controllable wettability of paraffin-anodic aluminum oxide composite surface with a roughness tunable by thermal expansion
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The roughness of a composite surface, one of factors determining the contact angle (CA), is controlled by the difference in the thermal expansion of constituents of the composite. The CA on a composite surface can be calculated by using an equation derived from Cassie and Wenzel relations. A composite of paraffin and anodic aluminum oxide was fabricated to verify this equation. The CA on this surface changed from 63 to 113° as the temperature increased from 1 to 40°C.
Keywordscomposite Cassie relation anodization wetting
This work was supported by the National Research Foundation of Korea (NRF) grant funded by Korea government (MEST) (No. 2010-0018457).
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