The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors

Jang, Gyoung Gug; Smith, D. Barton; List, Frederick Alyious; Lee, Dominc F.; Ievlev, Anton V.; Collins, Liam; Park, Jaehyeung; Polizos, Georgios

doi:10.1039/c8nr03024c

The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors

Journal Article · Thu Jul 05 00:00:00 EDT 2018 · Nanoscale

DOI:https://doi.org/10.1039/c8nr03024c· OSTI ID:1464003

^[1]; Smith, D. Barton ^[1]; List, Frederick Alyious ^[2]; Lee, Dominc F. ^[3]; ^[4]; Collins, Liam ^[4]; Park, Jaehyeung ^[5]; Polizos, Georgios ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Sustainable Electricity Program Office
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science
Dong-Eui Univ., Busan (Korea, Republic of). Division of Advanced Materials Engineering

In this paper, 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. Finally, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1464003

Alternate ID(s):: OSTI ID: 1461019

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 30 Vol. 10; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Transparent superhydrophilic and superhydrophobic nanoparticle textured coatings: comparative study of anti-soiling performance Jang, Gyoung Gug; Smith, D. Barton; Polizos, Georgios Nanoscale Advances, Vol. 1, Issue 3 https://doi.org/10.1039/c8na00349a	journal	January 2019
Design of surfaces for controlling hard and soft fouling Halvey, Alex Kate; Macdonald, Brian; Dhyani, Abhishek Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2138 https://doi.org/10.1098/rsta.2018.0266	journal	December 2018

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