ation from light. Based on the experimental results, MPIL shows better performance compared to PIL. The MPIL nanofluid was stable even after several consecutive heating/cooling cycles in the closed system. Due to low transparency, the MPIL exhibits the most light-to-heat conversion efficiency on its surface so that the surface temperature respectively reaches 62.5 ℃ and 78.0 ℃ after 60 min simulated light and sunlight irradiation.
