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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/).
Gelation time of CS-TBA-Fe hydrogels varies with concentration of chitosan (A), TBA (B), and Fe3+ (C), and the photos of the mixtures of chitosan and TBA without Fe3+ (D).