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. 2023 Jan 4;24(1):2156256. doi: 10.1080/14686996.2022.2156256

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© 2022 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 5. — (a) Photographs of BCP PC during the sequential pHⁱ/pH^d cycle. (b) SC hysteresis loops of BCP PC as a function of pH in HBr, CF₃COOH, HCl, and CH₃COOH aqueous solutions. Filled circles (●) and open circles (○) represent pH^d and pHⁱ cycles, respectively. The photographs of BCP SC treated with acidic ink (0.1 M HBr), followed by immersion in 0.03 M NaBr solution for (c) 12 h and (d) 96 h. (e) Photograph of erased BCP SC by washing with 0.1 M NaOH solution. Reproduced with permission [38]. Copyright 2010, Wiley-VCH.