Clean, energy-free methods of cooling are an effective way to respond to the global energy crisis. To date, cooling materials using passive daytime radiative cooling (RC) technology have been applied in the fields of energy-efficient buildings, solar photovoltaic cooling, and insulating textiles. However, RC materials frequently suffer from comprehensive damage to their microstructure, resulting in the loss of their initial cooling effect in complex outdoor environments. Here, a superhydrophobic daytime passive RC porous film with environmental tolerance (SRCP film) was fabricated, which integrated strong solar reflectivity (approximately 90%), mid-infrared emissivity (approximately 0.97), and superhydrophobicity (water contact angle (WCA) of 160° and sliding angle of 3°). This study revealed that SRCP film had an average reflectivity of 14.3% higher than SiO₂ particles in the 0.3–2.5 μm wavelength region, achieving a cooling effect of 13.2 °C in ambient conditions with a solar irradiance of 946 W·m^–2 and a relative humidity of 74% due to the synergistic effect of effective solar reflection and thermal infrared emission. In addition, empirical results showed that the attained films possessed outstanding environmental tolerance, maintaining high WCA (156°), stable cooling effect (8.3 °C), and low SiO₂ loss (less than 5.1%) after 30 consecutive days of UV irradiation and 14 days of corrosion with acidic and alkaline solutions. More importantly, this work could be flexibly prepared by various methods without the use of any fluorine-containing reagents, which greatly widens the practical application scope.

中文翻译：

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环境耐受性增强的无能耗超疏水辐射冷却多功能薄膜的实验研究


清洁、无能源的冷却方法是应对全球能源危机的有效途径。迄今为止，采用被动日间辐射冷却（RC）技术的冷却材料已应用于节能建筑、太阳能光伏冷却和绝缘纺织品等领域。然而，RC材料的微观结构经常遭受全面破坏，导致其在室外复杂环境下失去初始冷却效果。这里，制备了一种具有环境耐受性的超疏水日间被动RC多孔膜（SRCP膜），它集强太阳光反射率（约90％）、中红外发射率（约0.97）和超疏水性（水接触角（WCA）为160）于一体。 ° 和滑动角 3°）。研究表明，SRCP薄膜在0.3-2.5μm波长范围内的平均反射率比SiO ₂ 颗粒高14.3%，在太阳辐照度为946的环境条件下实现13.2℃的冷却效果由于有效的太阳反射和热红外发射的协同作用，W·m ^–2 和相对湿度为74%。此外，实验结果表明，所获得的薄膜具有出色的环境耐受性，在使用后仍能保持较高的WCA（156°）、稳定的冷却效果（8.3°C）和较低的SiO ₂ 损失（小于5.1%）。连续30天的紫外线照射和14天的酸性和碱性溶液腐蚀。更重要的是，该工作可以通过多种方法灵活制备，无需使用任何含氟试剂，大大拓宽了实际应用范围。