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. 2021 Sep 29;7(4):158. doi: 10.3390/gels7040158

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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(a) Illustration of the self-healing properties of a 2.0% w/v hydrogel formed from a d-gluconic acetal-based derivative using hydrogel pieces with and without methylene blue dye. (b) Rheological properties of a shear-thinning and self-healing supramolecular hydrogel based on a bis-urea derivative, showing (i) a strain sweep, (ii) a frequency sweep, and (iii, iv) dynamic strain amplitude tests. Reproduced (a) under the terms of the Creative Commons CC BY License from [60] ©2019 The Authors; published by Springer Nature and (b) with permission from [14] ©2019, Royal Society of Chemistry.