This study compares the optical and radiative cooling performance of single-layer films embedded with TiO2 or Al2O3 nanoparticles dispersed in a polymer matrix and backed with an aluminum reflector. Optical constants of both materials were obtained from literature, and wavelength-dependent scattering efficiencies were calculated using Mie theory. A Monte Carlo ray-tracing simulation was performed to evaluate the spectral reflectance, absorptance, and emissivity of each film across the solar and thermal-infrared regions. The TiO2-based film exhibited strong visible-light scattering but suffered significant ultraviolet (UV) absorption, resulting in an average solar reflectance of ~0.90. In contrast, the Al2O3-based film showed negligible UV absorption and maintained high reflectance (> 0.95) throughout the 0.3-2.5 μm solar band, leading to a higher net cooling power of approximately 105 W/m² compared to 85 W/m² for TiO2. These results demonstrate that UV reflectance is a key determinant of effective radiative cooling and indicate that Al2O3-based coatings offer strong potential for passive cooling applications in buildings and agricultural environments.

Abstract
1. 서 론
2. 연구 방법
3. 연구 결과
4. 결 론
후 기
References

• 윤시원(Professor of Smart Farm Department, Jeonbuk National University) | Siwon Yoon Corresponding author
• 서준용(professor, Department of Mechanical and Automotive Engineering, Kongju National University) | Junyong Seo
• 김중배(professor, Department of Mechanical and Automotive Engineering, Kongju National University) | Jung Bae Kim