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Title: Transparent superhydrophobic surfaces using a spray coating process

Abstract

One significant maintenance problem and cost associated with solar energy conversion systems is the soiling due to the accumulation of dust and other pollutants. Here in this work, we describe a scalable approach for applying antisoiling coatings based on superhydrophobic (SH) silica particles using a spray coating process. A large water contact angle (WCA) is one of the characteristics of excellent SH surfaces and because of the low surface energy and low adhesion forces the soiling rate is reduced. Our findings indicate that the WCA depends strongly on the ratio of the polymer binder and the nanoparticles. The nanoparticle surface coverage of the spray coated samples was substantially improved after rinsing with solvent. This process tended to remove large aggregates and excess polymer binder and further increased the WCA by allowing exposure of the functionalized nanoparticles. The durability of the SH coatings was enhanced when the substrate was pretreated with polymer binder and an optimal curing time between 30 and 60 min. The abrasion tests of the SH coatings we report in this study showed that the WCA decreased from ~ 166° to ~ 157° after exposure to 2.6 g of sand. Such coatings will help reduce costs of periodicmore » cleaning of solar energy conversion systems (photovoltaic panels and concentrated solar mirrors).« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1426588
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Solar Energy Materials and Solar Cells
Additional Journal Information:
Journal Volume: 176; Journal ID: ISSN 0927-0248
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Solar; Glass; Superhydrophobic; Antisoiling; Optical transmission; Nanoparticles

Citation Formats

Polyzos, Georgios, Jang, Gyoung Gug, Smith, D. Barton, List III, Frederick Alyious, Lassiter, Matthew G., Park, Jaehyeung, and Datskos, Panos G. Transparent superhydrophobic surfaces using a spray coating process. United States: N. p., 2017. Web. doi:10.1016/j.solmat.2017.10.029.
Polyzos, Georgios, Jang, Gyoung Gug, Smith, D. Barton, List III, Frederick Alyious, Lassiter, Matthew G., Park, Jaehyeung, & Datskos, Panos G. Transparent superhydrophobic surfaces using a spray coating process. United States. doi:10.1016/j.solmat.2017.10.029.
Polyzos, Georgios, Jang, Gyoung Gug, Smith, D. Barton, List III, Frederick Alyious, Lassiter, Matthew G., Park, Jaehyeung, and Datskos, Panos G. Fri . "Transparent superhydrophobic surfaces using a spray coating process". United States. doi:10.1016/j.solmat.2017.10.029.
@article{osti_1426588,
title = {Transparent superhydrophobic surfaces using a spray coating process},
author = {Polyzos, Georgios and Jang, Gyoung Gug and Smith, D. Barton and List III, Frederick Alyious and Lassiter, Matthew G. and Park, Jaehyeung and Datskos, Panos G.},
abstractNote = {One significant maintenance problem and cost associated with solar energy conversion systems is the soiling due to the accumulation of dust and other pollutants. Here in this work, we describe a scalable approach for applying antisoiling coatings based on superhydrophobic (SH) silica particles using a spray coating process. A large water contact angle (WCA) is one of the characteristics of excellent SH surfaces and because of the low surface energy and low adhesion forces the soiling rate is reduced. Our findings indicate that the WCA depends strongly on the ratio of the polymer binder and the nanoparticles. The nanoparticle surface coverage of the spray coated samples was substantially improved after rinsing with solvent. This process tended to remove large aggregates and excess polymer binder and further increased the WCA by allowing exposure of the functionalized nanoparticles. The durability of the SH coatings was enhanced when the substrate was pretreated with polymer binder and an optimal curing time between 30 and 60 min. The abrasion tests of the SH coatings we report in this study showed that the WCA decreased from ~ 166° to ~ 157° after exposure to 2.6 g of sand. Such coatings will help reduce costs of periodic cleaning of solar energy conversion systems (photovoltaic panels and concentrated solar mirrors).},
doi = {10.1016/j.solmat.2017.10.029},
journal = {Solar Energy Materials and Solar Cells},
number = ,
volume = 176,
place = {United States},
year = {Fri Nov 03 00:00:00 EDT 2017},
month = {Fri Nov 03 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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