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. 2021 Sep 3;13(17):2994. doi: 10.3390/polym13172994

Figure 7.

Figure 7

Cytotoxicity test of HA synthesized at (a) pH 4 and (b) pH 9 in hydrothermal synthesis without a surfactant (P) and with different surfactants: CTAB, SDS, F127, and CAPB (column before calcination: blue; column after calcination: red).