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. 2017 Oct 12;2(10):6668–6676. doi: 10.1021/acsomega.7b01067

Figure 2.

Figure 2

(a) Relative fractions of mono- (green), bis- (blue), and tris-catechol/Fe3+ (red) complexes in the PTFe hydrogel as a function of the pH. (b) Raman spectra of PDDA, TA, PDDA/TA mixture, and PTFe-3 hydrogels with different pH values.