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. 2019 Oct 29;12(21):3546. doi: 10.3390/ma12213546

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Optical images of water droplets on the surfaces: (a) untreated; (b) etched by10.2 wt% HCl for 42 h; (c) etched by 10.1 wt% H₂SO₄ for 42 h; (d) etched by 10.0 wt% H₃PO₄ for 56 h; (e) etched by 10.1 wt% HNO₃ for 56 h; and (f) etched by 40.0 wt% HF for 28 h.

Optical images of water droplets on the surfaces: (a) untreated; (b) etched by10.2 wt% HCl for 42 h; (c) etched by 10.1 wt% H₂SO₄ for 42 h; (d) etched by 10.0 wt% H₃PO₄ for 56 h; (e) etched by 10.1 wt% HNO₃ for 56 h; and (f) etched by 40.0 wt% HF for 28 h.