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a) Temperature increases of deionized water and the aqueous dispersions of o‐W18O49, n‐W18O49, and r‐W18O49. b) The photothermal effect of o‐W18O49, n‐W18O49, and r‐W18O49. The dispersions were irradiated by using a 808 nm laser at a power density of 3.5 W cm−2 for 900 s and cooled to room temperature in an ambient environment. c) The time constant for heat transfer from the system is calculated to be 382 s. d) The UV/Vis spectra of o‐W18O49, n‐W18O49, and r‐W18O49 dispersions.
