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Hierarchically structured re-entrant microstructures for superhydrophobic surfaces with extremely low hysteresis, Hu, Huan, Swaminathan, Vikhram V, Farahani, Mahmoud Reza Zamani, Mensing, Glennys, Yeom, Junghoon, Shannon, Mark A, Zhu, Likun
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Hu et al. (2014) studied this question.
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