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. 2022 Dec 23;15(1):416–431. doi: 10.1021/acsami.2c17424

Figure 2.

Figure 2

Structural characterization of the Fe-TA@P(AM-AA) hydrogel. (A) UV–vis absorption spectra of the TA/Fe complex solution with different Fe3+ concentrations (0, 5, 10, and 20 mg/mL). (B) FT-IR spectra of PAM, TA, and Fe-TA@P(AM-AA) hydrogels. (C) Raman spectra of PAM, TA, and Fe-TA@P(AM-AA) hydrogels. (D) SEM images and diameter analysis of Fe-TA@P(AM-AA) hydrogels. (E, F) Swelling properties of the Fe-TA@P(AM-AA) hydrogels with different Fe3+ concentrations in phosphate-buffered saline, pH = 7.4.