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Outdoor cooling experiments. (a) Temporal changes in temperature for the passive cooling materials shown in Figure 3(b). Inset: photographs of the measured samples: HSNP-coated, silica NP-coated, white paint-coated, acrylic, PDMS/Ag paste-coated, and bare silicone substrate samples, from left to right. (b) Temporal changes in the temperature of bare and HSNP-printed (a filling ratio of 10 %) Si substrates.
