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Anti-soiling performance of high reflective superhydrophobic nanoparticle-textured mirror

Abstract

The anti-soiling (AS) performance of solar mirrors coated with a highly transparent, superhydrophobic nanoparticle-textured coatings has been characterized. The AS coatings were created on the mirror surface by depositing nano-textured silica nanoparticle layers with ~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 on the AS-coated mirrors (20×30 cm2, no measurable loss in specular reflectance, and water contact angle >165) provided 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 having in the range of hydrophobic to superhydrophobic was also studied. A dramatic decrease in adhesive force acting on the particle was observed with increasing surface hydrophobicity. The results align well with observed dust accumulation on the AS coated mirrors. The AS-coated mirror maintains high reflectivity by shedding dust and resisting dust accumulation, providing a potential benefit when applied to mirrors in the solar field of a concentrating solar power generating plant.

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Publication details

The article was received on 13 Apr 2018, accepted on 04 Jul 2018 and first published on 05 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR03024C
Citation: Nanoscale, 2018, Accepted Manuscript
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    Anti-soiling performance of high reflective superhydrophobic nanoparticle-textured mirror

    G. G. Jang, D. B. Smith, F. A. List, D. F. Lee, A. Ievlev, L. Collins, J. Park and G. Polizos, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR03024C

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