Abstract Polytetrafluoroethylene (PTFE) film has been deposited on solar selective absorber (SSA) by electron beam evaporation. The water contact angle of the SSA surface after coating with PTFE (called PSSA) has increased from 72o to 150o, indicating that the surface has changed from hydrophilic to superhydrophobic. The absorptance of the SSA was 92.91% after coating with PTFE, while the emittance of the SSA was slightly increased due to the absorption of PTFE material itself. The color difference of SSA before and after coating with PTFE was small because of the high transmittance of PTFE film. In addition, the self-cleaning tests via water droplets of SSA and PSSA show that SSA has significant self-cleaning property after coating with PTFE. The results can provide reference for superhydrophobic coating applied to solar thermal fields.

中文翻译：

---

电子束蒸发沉积在太阳能选择性吸收体上的超疏水聚四氟乙烯薄膜

摘要 聚四氟乙烯 (PTFE) 薄膜已通过电子束蒸发沉积在太阳能选择性吸收器 (SSA) 上。SSA表面涂覆PTFE（称为PSSA）后的水接触角从72o增加到150o，表明表面由亲水变为超疏水。涂上PTFE后SSA的吸收率为92.91%，而由于PTFE材料本身的吸收，SSA的发射率略有增加。由于 PTFE 薄膜的高透光率，SSA 涂覆 PTFE 前后的色差很小。此外，通过SSA和PSSA的水滴自清洁测试表明，SSA在涂覆PTFE后具有显着的自清洁性能。研究结果可为超疏水涂层应用于太阳能热场提供参考。