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. 2018 Sep 7;4(9):eaat7457. doi: 10.1126/sciadv.aat7457

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Photos show the color changes before and after polydopamine coating at different pH values [Md-Bc, pH 8.8 (left); St-Bc, pH 9.8 (middle); and unmodified (right)]. PDMS, poly(dimethyl siloxane). (B) The thickness of the polydopamine coating on TiO₂ substrates at different pH values and the corresponding contact angle images of the polydopamine-coated substrate immersed in Md-Bc solutions (7.4 < pH < 8.8; left) or St-Bc solutions (9.8 < pH < 10.8; middle) and the bare TiO₂ substrate (right). (C) Delamination scheme for the polydopamine coating by potential deprotonation in strong alkaline solutions. (D) The polydopamine coating on TPU film was peeled off in 0.1 N NaOH (pH 12) solution.