The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors
Abstract
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 whenmore »
- Authors:
-
[1];
[4];
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC)
- OSTI Identifier:
- 1464003
- Alternate Identifier(s):
- OSTI ID: 1461019
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nanoscale
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 30; Journal ID: ISSN 2040-3364
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Jang, Gyoung Gug, Smith, D. Barton, List, Frederick Alyious, Lee, Dominc F., Ievlev, Anton V., Collins, Liam, Park, Jaehyeung, and Polizos, Georgios. The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors. United States: N. p., 2018.
Web. doi:10.1039/c8nr03024c.
Jang, Gyoung Gug, Smith, D. Barton, List, Frederick Alyious, Lee, Dominc F., Ievlev, Anton V., Collins, Liam, Park, Jaehyeung, & Polizos, Georgios. The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors. United States. https://doi.org/10.1039/c8nr03024c
Jang, Gyoung Gug, Smith, D. Barton, List, Frederick Alyious, Lee, Dominc F., Ievlev, Anton V., Collins, Liam, Park, Jaehyeung, and Polizos, Georgios. Thu .
"The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors". United States. https://doi.org/10.1039/c8nr03024c. https://www.osti.gov/servlets/purl/1464003.
@article{osti_1464003,
title = {The anti-soiling performance of highly reflective superhydrophobic nanoparticle-textured mirrors},
author = {Jang, Gyoung Gug and Smith, D. Barton and List, Frederick Alyious and Lee, Dominc F. and Ievlev, Anton V. and Collins, Liam and Park, Jaehyeung and Polizos, Georgios},
abstractNote = {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.},
doi = {10.1039/c8nr03024c},
journal = {Nanoscale},
number = 30,
volume = 10,
place = {United States},
year = {Thu Jul 05 00:00:00 EDT 2018},
month = {Thu Jul 05 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Transparent superhydrophilic and superhydrophobic nanoparticle textured coatings: comparative study of anti-soiling performance
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