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. 2019 Mar 10;9(3):404. doi: 10.3390/nano9030404

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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(A) Schematic of the preparation of the MOF–alginate composite. Photographs of (B) alginate hydrogels cross-linked by Cu²⁺ right after the addition of a sodium alginate aqueous solution to a Cu²⁺ aqueous solution, (C) alginate hydrogels cross-linked by Cu²⁺ after being washed with water and ethanol, and (D) HKUST-1–alginate hydrogels [159]. Reprinted with permission from Ref. [159]. Copyright American Chemical Society, 2016.