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. 2023 Jul 17;120(30):e2302014120. doi: 10.1073/pnas.2302014120

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Copyright © 2023 the Author(s). Published by PNAS.

This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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Fig. 2. — The 2D time-resolved FT-IR spectra of SiO₂ during contact. (A) The 2D time-resolved FT-IR spectrum of the SiO₂ nanoparticles during their contact with water vapor generated from DI water at room temperature. (B) The 2D time-resolved FT-IR spectrum of the SiO₂ nanoparticles during their contact with water vapor generated from a 10% NaCl solution at room temperature. (C) The 2D time-resolved FT-IR spectrum of the SiO₂ nanoparticles during their contact with water vapor generated from DI water at 120 °C. (D) The corresponding 2D time-resolved FT-IR spectrum at 600 °C.