Fig. 5 | Nature Communications

Fig. 5

From: Optically-controlled long-term storage and release of thermal energy in phase-change materials

Fig. 5

Water-heating experiments. Showing the temperature changes of 1 g of water (blue curve) in contact with 3 g of a, ultraviolet-charged phase-change materials (PCM) composite (35 mol% of cis azobenzene dopant (compound 1)) in the dark. b Optically triggered composite by the exposure to a blue light-emitting diode lamp at 31 °C for 500 s to maximize the discharging of cis azobenzene, (c) pristine PCM (i.e., tridecanoic acid), (e) octadecane, and (f) water bath. The inset of (e) shows the setup where each thermocouple is submerged in a heating medium and in a vial containing water. The temperature of water in the vial is at 21–22 °C under ambient condition and quickly increases as the vial is immersed in the heating medium at 40 °C. The temperatures of the heating medium (T PCM) and water (T water) are recorded simultaneously after T PCM reaches 41–42 °C while the heating fluid is stirred. d Temperature change of pristine PCM under ambient condition without the process of dipping a water container into the PCM heating bath

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