Droplet manipulation of hierarchical steel surfaces using femtosecond laser fabrication
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© 2020 Femtosecond laser irradiation is one of the most promising treatments to fabricate liquid repellent surfaces, attracting substantial scientific and industrial attention. So far, the focus has been on hierarchical interfacial structures at micro- and nanoscales, however, this has yet to be used in combination with macro-sized features. We present a strategy of femtosecond laser irradiation to create macro-micro-nano hierarchical surfaces for liquid droplet manipulation. These three-level hierarchical surfaces are shown to successfully split and gyrate impacting droplets. Our work is believed to be the first demonstration of femtosecond-laser-structured macro-micro-nano hierarchical surfaces to artificially design droplet impact, paving the way for aircraft anti-icing and energy harvesting.
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1873-5584