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. 2023 Sep 29;21:353. doi: 10.1186/s12951-023-02104-w

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — a The release profiles of Cur from CaCO₃@Cur@QTX125 nanoparticles in PBS at a pH = 7.4 and NaAc at pH = 5.2. a The release profiles of Cur from CaCO₃@Cur@ QTX125@HA nanoparticles in PBS at pH = 7.4 and NaAc at pH = 5.2. c Representative TEM images of CaCO₃@Cur@QTX125@HA nanoparticles incubated in NaAc at a pH of 5.2 over different periods of time, scale bars represent 200 nm. d Time-dependent size changes of CaCO₃@Cur@QTX125@HA in NaAc at a pH of 5.2 for different periods of time