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. 2022 Dec 12;23(24):15757. doi: 10.3390/ijms232415757

Figure 2.

Figure 2

(A) Preparation mechanism of Agar/hydrophobic associated polyacrylamide (HPAAm) hydrogel. Reprinted with permission from [15]. 2015, Wiley; (B) Preparation mechanism of four-element DN physical cross-linking hydrogel. Reprinted with permission from [16]. 2022, Elsevier; (C) Preparation mechanism of PEC and DPC hydrogels. Reprinted with permission from [17]. 2018, Wiley; (D) Preparation mechanism of sodium alginate/polyacrylamide-acrylate-octadecyl methacrylate Fe3+ (SA/P(AAM-AAC-OMA)-Fe3+) hydrogel. Reprinted with permission from [22]. 2021, Wiley.