Nature calls: The lotus leaf is held as a symbol of purity due to its ability to remain clean after emerging from murky ponds. Its superhydrophobic surface, which removes undesired particles in water droplets, is mimicked by a simple and inexpensive method involving self-generation of superhydrophobic films on copper substrates. The resulting films (water contact angle of 170±1.6°, see picture) show good self-cleaning properties.
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Guo et al. (2006) studied this question.
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