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. 2021 Sep 13;13(9):1461. doi: 10.3390/pharmaceutics13091461

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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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Scanning electron micrographs of the CS/PVA hydrogels in cross section: (a) CS₁/PVA₁E₁(24); (b) CS₁/PVA₁E₂(24); (c) CS₁/PVA₁E₂(48); (d) CS₁/PVA₁B₁(24); (e) CS₁/PVA₁B₂(24); (f) CS₁/PVA₁B₂(48); (g) CS_0.5/PVA₁E₂(24); (h) CS₁/PVA_0.5E₂(24).