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Frequency sweep measurements and scanning electron microscopy (SEM) images of alginate hydrogel. (A), (B) and (C), (D) are 1 wt% alginate hydrogels with 40% and 80% crosslinking; (E), (F) and (G), (H) are 2 wt% alginate hydrogels with 40% and 80% crosslinking. Ag-I and Ag-II are alginate hydrogels with 40% and 80% crosslinking, respectively. The measurements for each sample were performed three times. Scale bar = 200 μm.
