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. 2022 Sep 12;13:5365. doi: 10.1038/s41467-022-33098-y

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Fig. 2 — Variation of UV-Vis-NIR absorption of a cc-Fe₃O₄ NPs and b TD-Fe₃O₄ NPs with aeration oxidation time. Insets are photos of the suspensions corresponding to oxidation times at 0, 0.5, 1, 3, 5, 8, 10, and 12 h. All spectra and photos were obtained at the same Fe concentration. c Changes in a_nano of the oxidized cc-Fe₃O₄ NPs and TD-Fe₃O₄ NPs during the aeration oxidation. Error bars represent standard deviation from three independent measurements.