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. 2021 Jul 19;11(7):1854. doi: 10.3390/nano11071854

Figure 2.

Figure 2

(a) FT-IR spectra and (b) conductivity of different conductive hydrogel samples. (c) The SEM image and (d) the element mapping (Si) of EDX spectra of a freeze-dried PHC/Ca2+/SiO2 NPs hydrogels.