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The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors†‡
Nanoscale ( IF 5.8 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1039/c8nr03024c Gyoung Gug Jang 1, 2, 3, 4 , D. Barton Smith 1, 2, 3, 4 , Frederick Alyious List 4, 5, 6 , Dominc F. Lee 4, 6, 7 , Anton V. Ievlev 4, 6, 8 , Liam Collins 4, 6, 8 , Jaehyeung Park 9, 10, 11, 12 , Georgios Polizos 1, 2, 3, 4
Nanoscale ( IF 5.8 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1039/c8nr03024c Gyoung Gug Jang 1, 2, 3, 4 , D. Barton Smith 1, 2, 3, 4 , Frederick Alyious List 4, 5, 6 , Dominc F. Lee 4, 6, 7 , Anton V. Ievlev 4, 6, 8 , Liam Collins 4, 6, 8 , Jaehyeung Park 9, 10, 11, 12 , Georgios Polizos 1, 2, 3, 4
Affiliation
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The anti-soiling (AS) performance of solar mirrors coated with a highly transparent, superhydrophobic nanoparticle-textured coating has been characterized. The AS coatings were created on the mirror surface by depositing nano-textured silica nanoparticle layers of ∼250 nm thickness using a draw-down coating process, followed by fluorination of the nanoparticles in a molecular vapor deposition process. Highly uniform surface features of the AS-coated mirrors (20 × 30 cm2, no measurable loss in specular reflectance, and water contact angle >165°) provided an outstanding AS performance. A 4× reduction in the rate of dust accumulation as determined by gravimetric measurement of the accumulated dust on coated versus uncoated mirrors was observed. Additional evidence of a significant reduction in soiling rate was determined during measurements of specular reflectance in an outdoor environment test. The adhesion force between a model sand particle and nano-textured coatings in the hydrophobic to superhydrophobic range was also studied. A dramatic decrease in adhesive force acting on the particle was observed with increasing surface hydrophobicity. The results align well with the observed dust accumulation on the AS-coated mirrors. The AS-coated mirror maintains a high reflectivity by shedding dust and resisting dust accumulation, providing a potential benefit when applied to mirrors in the solar field of a concentrated solar power generation plant.
中文翻译：
高反射超疏水纳米颗粒纹理反射镜的防污性能† ‡
已经表征了涂覆有高度透明的，超疏水的纳米颗粒织构化涂层的太阳镜的抗污（AS）性能。通过使用下拉式涂层工艺沉积约250 nm厚的纳米织构二氧化硅纳米颗粒层，然后在分子气相沉积工艺中对纳米颗粒进行氟化，可在镜面上形成AS涂层。AS镀膜镜的表面特征非常均匀（20×30 cm 2，镜面反射率没有可测量的损失，并且水接触角> 165°）提供了出色的AS性能。重量的4倍减少，这是通过重量分析法测得的涂层尘埃相对于涂层尘埃的4倍。观察到未镀膜的镜子。在室外环境测试中测量镜面反射率时，确定了污染率显着降低的其他证据。还研究了模型砂颗粒与纳米纹理涂层在疏水性至超疏水性范围内的粘附力。随着表面疏水性的增加，观察到作用在颗粒上的粘合力急剧下降。结果与观察到的在AS镀膜反射镜上积聚的灰尘非常吻合。镀有AS的镜面通过排出灰尘和防止灰尘积聚来保持高反射率，当将其应用于集中式太阳能发电厂的太阳能领域中的镜面时，具有潜在的优势。
更新日期：2018-07-05
中文翻译：
高反射超疏水纳米颗粒纹理反射镜的防污性能† ‡
已经表征了涂覆有高度透明的，超疏水的纳米颗粒织构化涂层的太阳镜的抗污（AS）性能。通过使用下拉式涂层工艺沉积约250 nm厚的纳米织构二氧化硅纳米颗粒层，然后在分子气相沉积工艺中对纳米颗粒进行氟化，可在镜面上形成AS涂层。AS镀膜镜的表面特征非常均匀（20×30 cm 2，镜面反射率没有可测量的损失，并且水接触角> 165°）提供了出色的AS性能。重量的4倍减少，这是通过重量分析法测得的涂层尘埃相对于涂层尘埃的4倍。观察到未镀膜的镜子。在室外环境测试中测量镜面反射率时，确定了污染率显着降低的其他证据。还研究了模型砂颗粒与纳米纹理涂层在疏水性至超疏水性范围内的粘附力。随着表面疏水性的增加，观察到作用在颗粒上的粘合力急剧下降。结果与观察到的在AS镀膜反射镜上积聚的灰尘非常吻合。镀有AS的镜面通过排出灰尘和防止灰尘积聚来保持高反射率，当将其应用于集中式太阳能发电厂的太阳能领域中的镜面时，具有潜在的优势。
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