The random micro-particle-embedded thin film is an inexpensive and scalable structure for radiative cooling (RC). However, current investigations on evaluating the performance of such films assume that the embedded particles are perfectly separated from each other. The particle agglomeration effects on the spectral characteristics of the film are dismissed. In this work, by comparing the spectral reflectivity and emissivity of a film composed of perfectly separated TiO2 particles, three-particle aggregations, five-particle aggregations, and ten-particle aggregations, we studied the particle agglomeration impacts on the performance of a disordered radiative cooling film with a thickness of 50 μm. The results show that the agglomeration suppresses the solar reflectivity of the particle-embedded film and harms the temperature drop and cooling power in RC applications. Therefore, particle agglomeration is intended to be industriously eliminated in the preparation of a random particle-embedded thin film for radiative cooling. The results in this paper provide a further explanation of the difference between the theoretical calculations and experimental measurements of the cooling performance of a particle-embedded RC film.
TiO2 particle agglomeration impacts on radiative cooling films with a thickness of 50 μm
Note: This paper is part of the APL Special Collection on Thermal Radiation at the Nanoscale and Applications.
Cun-Hai Wang, Ming-Xiang Liu, Ze-Yi Jiang; TiO2 particle agglomeration impacts on radiative cooling films with a thickness of 50 μm. Appl. Phys. Lett. 14 November 2022; 121 (20): 202204. https://doi.org/10.1063/5.0121980
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