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Facile fabrication and antifogging test of a calcination-free SiO2 superhydrophilic coating

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • Published:
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Abstract

The low cost, accessibility, and ease of implementation of SiO2 hydrophilic coatings should encourage further promotion as practical surface treatments. The calcination process, however, poses an obstacle to convenience. Herein, a calcination-free, antifogging SiO2 superhydrophilic coating was prepared at room temperature by sol–gel method with the guidance of particle gradation theory, which was used to regulate the size and concentration of colloid nanoparticles. The surface micromorphology, roughness, and water contact angle (WCA) of coatings were characterized and measured using scanning electron microscope (SEM), atomic force microscope (AFM), and contact angle measuring equipment. The antifogging capability of superhydrophilic coating was also examined. It has been found that hydrophilicity of coatings can be significantly improved by reasonable particle gradation design. The closer the particle packing pattern is to the hexagonal close-packing model, the better the hydrophilicity of coatings. When the concentration ratio of particle diameter 60.29, 9.26, and 3.68 nm is 15:4:1, the coating exhibits exceptional hydrophilicity (WCA, 2.3°) and outstanding anti-fogging performance. An implication of this study is that a versatile and easily manipulated strategy is presented here for designing surface microstructures that are sensitive to roughness.

Graphical Abstract

Highlights

  • The calcination-free SiO2 superhydrophilic coating was successfully prepared by the sol-gel method.

  • Reasonable matching of colloidal silica particle size can effectively improve the coating hydrophilic performance.

  • The silica coating exhibits exceptional hydrophilicity (WCA, 2.3°) and outstanding anti-fogging performance.

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Acknowledgements

This work was financially supported by the science foundation of the National Key Laboratory Foundation of Science and Technology on Advanced Composites in the Special Environments and Shenzhen Science and Technology Program (Grant No. KQTD2016112814303055).

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Authors and Affiliations

  1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China

    Mingwei Li, Hong Xu & Wenhao Li

  2. Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150080, China

    Yulei Sun, Yesheng Zhong, Liping Shi, Rongguo Wang & Xiaodong He

  3. Center of Analysis and Measurement, Harbin Institute of Technology, Harbin, 150001, China

    Gang Zeng

  4. Shenzhen STRONG Advanced Materials Research Institute Co., Ltd, Guangdong, 518000, China

    Xiaodong He

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  1. Mingwei Li
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Li, M., Sun, Y., Zeng, G. et al. Facile fabrication and antifogging test of a calcination-free SiO2 superhydrophilic coating. J Sol-Gel Sci Technol 105, 662–672 (2023). https://doi.org/10.1007/s10971-023-06042-9

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  • DOI: https://doi.org/10.1007/s10971-023-06042-9

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