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TEOS/silane coupling agent composed double layers structure: A novel super-hydrophilic coating with controllable water contact angle value

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  • Yan, Hu
  • Yuanhao, Wang
  • Hongxing, Yang

Abstract

The soiling of the photovoltaic (PV) modules’ front surfaces decreases the power generation efficiency a lot. In this paper, a novel self-cleaning (super-hydrophilic) glass coating material with double layers’ structure is prepared and the synthesis process is simple and low-price. This super-hydrophilic coating barely decreases the transparency of the glass above solar cells in the PV modules. It only reduces about 2.9% of transparency compared with original glass. Briefly, TEOS (Tetraethylorthosilicate) is skillfully utilized as hydrophobic interlayer, connected to the substrate surface and super-hydrophilic layer, whose effective component is a particular silane-coupling agent named as 2-[acetoxy (polyethyleneoxy) propyl] triethoxysilane (abbreviated as SIA). The interlayer has three advantages: firstly, after the TEOS hydrophobic layer is coated, SIA’s hydrophobic siloxane terminals assemble toward this layer; secondly, SIA’s steric hindrance would decrease obviously because most of the molecules assemble orderly on the interlayer; thirdly, TEOS provides much more grafting sites and more SIA molecules are grafted. Thus, with the increasing TEOS’s concentration, the SIA’s coating becomes firmer, and the SIA’s concentration influences the water contact angle (CA). When it is bigger than 2.5%, the CA is less than 10° and the surface turns to super-hydrophilic. Besides, according to the samples with different SIA’s concentration and contact angle value, a fitting curve whose R2 is higher than 0.95 is made. Based on this, the experimental contact angle value of a surface made from this SIA could be predicted. And the difference between experimental and theoretical contact angle value ranges from 1.11% to 5.88%.

Suggested Citation

  • Yan, Hu & Yuanhao, Wang & Hongxing, Yang, 2017. "TEOS/silane coupling agent composed double layers structure: A novel super-hydrophilic coating with controllable water contact angle value," Applied Energy, Elsevier, vol. 185(P2), pages 2209-2216.
  • Handle: RePEc:eee:appene:v:185:y:2017:i:p2:p:2209-2216
    DOI: 10.1016/j.apenergy.2015.09.097
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    References listed on IDEAS

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    1. Rong Wang & Kazuhito Hashimoto & Akira Fujishima & Makota Chikuni & Eiichi Kojima & Atsushi Kitamura & Mitsuhide Shimohigoshi & Toshiya Watanabe, 1997. "Light-induced amphiphilic surfaces," Nature, Nature, vol. 388(6641), pages 431-432, July.
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    Cited by:

    1. Wang, Shiwen & Yu, Zhaoyong & Wang, Lili & Wang, Yijia & Yu, Deyou & Wu, Minghua, 2023. "A core-shell structured barium titanate nanoparticles for the enhanced piezoelectric performance of wearable nanogenerator," Applied Energy, Elsevier, vol. 351(C).
    2. Rafi Zahedi & Parisa Ranjbaran & Gevork B. Gharehpetian & Fazel Mohammadi & Roya Ahmadiahangar, 2021. "Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives," Energies, MDPI, vol. 14(7), pages 1-25, April.
    3. Gao, Linyue & Liu, Yang & Ma, Liqun & Hu, Hui, 2019. "A hybrid strategy combining minimized leading-edge electric-heating and superhydro-/ice-phobic surface coating for wind turbine icing mitigation," Renewable Energy, Elsevier, vol. 140(C), pages 943-956.
    4. Oliveira, Michele Cândida Carvalho de & Diniz Cardoso, Antônia Sonia Alves & Viana, Marcelo Machado & Lins, Vanessa de Freitas Cunha, 2018. "The causes and effects of degradation of encapsulant ethylene vinyl acetate copolymer (EVA) in crystalline silicon photovoltaic modules: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2299-2317.
    5. Zhong, Hong & Hu, Yan & Wang, Yuanhao & Yang, Hongxing, 2017. "TiO2/silane coupling agent composed of two layers structure: A super-hydrophilic self-cleaning coating applied in PV panels," Applied Energy, Elsevier, vol. 204(C), pages 932-938.
    6. Song, Zhe & Liu, Jia & Yang, Hongxing, 2021. "Air pollution and soiling implications for solar photovoltaic power generation: A comprehensive review," Applied Energy, Elsevier, vol. 298(C).

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