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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 (https://creativecommons.org/licenses/by/4.0/).
The dependence of the contact angle on the PAA pore diameter and etching duration of the barrier layer obtained during one-stage (A,C) and two-stage (B,D) anodizing after chemical modification (after 1 min the water drop applying).