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. 2020 Nov 18;10(11):2287. doi: 10.3390/nano10112287

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© 2020 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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(a) Experimental setup for wettability testing. (b) Wettability testing result example: droplet upon the design shown in Figure 4b. (c) Wettability testing result example: droplet upon the design shown in Figure 4c.