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Characterizations of the Cu-EGCG and hydrogels. (A) SEM images of Cu-EGCG. (B) Particle size distribution of Cu-EGCG. (C) EDS image of Cu-EGCG. (D) 1H NMR spectra of Sil and SilMA. (E) 1H NMR spectra of HA and HAMA. (F) SEM image of the hydrogel.
