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. 2021 Jul 21;9:63–76. doi: 10.1016/j.bioactmat.2021.07.014

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© 2021 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 2 — (a) The photothermal-conversion performance of HMPB@sPP@HA at different concentrations (40, 80 160 μg mL⁻¹) under the 808 nm laser irradiation (1 W cm⁻²). (b) Heating and cooling curves of HMPB@sPP@HA under the 808 nm laser on/off irradiation at different intensities (0.5, 1 and 2 W cm⁻²). (c) The photothermal-conversion performance of HMPB@sPP@HA over four laser-on/off rounds (1 W cm⁻²). (d) The photothermal images under continuous laser irradiation, corresponding to Fig. 2a. (e) The photothermal images under laser on/off irradiation, corresponding to Fig. 2b. (f) Photothermal-conversion efficiency of HMPB@sPP@HA at 808 nm. The pink line represents temperature change curves of the solution under 808 nm laser on/off irradiation at 2 W cm⁻². The blue line represents heat transfer time constant (τ_s), obtained by regression analysis of the linear time date from the cooling curve. (g) The UV-NIR spectrums of HMPB@sPP@HA solution before and after four laser on/off irradiation rounds. (h) The particle size of HMPB@sPP@HA before and after four laser on/off irradiation rounds.