Abstract
Superhydrophobic alumina films with a 2D close-packed array of nanospheres have been successfully fabricated on industrial aluminum foils by a simple anodization method and following modification. The water contact angle of the resultant surfaces is about 154.6°±1.4° and the adhesion of water droplets is very weak. Moreover, spherical droplets grow sparsely on the as-prepared superhydrophobic foils during cooling and can be liquid without ice formation for more than 30min after being continuously cooled to 0°C. Such foils have significant application prospects in high-efficient heat exchangers and products operating under low temperature.
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