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Timing of polyethylene glycol addition for the control of SiO2 sol structure and sol–gel coating properties

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Abstract

Polyethylene glycol (PEG) was added during the sol process of sol–gel SiO2 coating preparation to investigate the effect of PEG addition timing on particle growth, sol structure, and coating properties. When PEG was added before the addition of the catalyst, the particle size increased from 10 nm (in sol without PEG) to 20 nm, and the necessary aging time for dip coating was shortened from 5 days (in sol without PEG) to ~30 h. When PEG was added 24 h later than the catalyst, the uniform sol structure and small particle unit were obtained. With the delay of the PEG addition timing to 120 h, the improvement in the homogeneity of the sol was continued, whereas the porosity of the resulting coatings decreased. The refractive index of PEG-modified SiO2 coatings can be adjusted in a continuous range between 1.14 and 1.20, using the timing when the PEG was added. The highest peak transmittance of glass that was coated with PEG-modified silica coatings reached 99.90%. All the coatings can be changed from hydrophilic to hydrophobic after hexamethyldisilazane vapor modification.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (51172163, 11404243), the National High Technology Research and Development Program of China (2013AA031801), the Scientific Research Activation Fund of Northwestern Polytechnical University of China (G2016KY0306), and the Science and Technology Innovation Fund of Shanghai Aerospace, China (SAST201321).

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Authors and Affiliations

  1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics and Engineering, Tongji University, Shanghai, 200092, China

    Youlai Xiang, Xiaoguang Li, Ai Du, Shuai Wu, Jun Shen & Bin Zhou

  2. Department of Applied Physics, School of Science, Northwestern Polytechnical University, Xi’an, 710129, China

    Xiaoguang Li

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  1. Youlai Xiang
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  2. Xiaoguang Li
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Correspondence to Xiaoguang Li or Bin Zhou.

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Xiang, Y., Li, X., Du, A. et al. Timing of polyethylene glycol addition for the control of SiO2 sol structure and sol–gel coating properties. J Coat Technol Res 14, 447–454 (2017). https://doi.org/10.1007/s11998-016-9864-7

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