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Facile synthesis of BaSO4@SiO2@TiO2 composites and its coating mechanism analysis

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Abstract

Herein, SiO2-coated BaSO4 powders were prepared by a liquid phase deposition method starting from inexpensive Na2SiO3, and a rutile TiO2 film was subsequently coated on the surface of SiO2 using TiOSO4 as the raw material. Under the optimum experimental conditions, the BaSO4@SiO2@TiO2 composite showed a refraction index of 1.90 and a whiteness of 92.4. The morphology of the cladding film showed that the composites were well dispersed with a small amount of agglomeration. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis indicated that a uniform-coated layer of dense TiO2 film on the surface of BaSO4 particles was achieved by coating an amorphous SiO2 interlayer. The electron binding energy and relative intensity of Ti 2p, Si 2p, Ba 3d, and O 1s as a function of the coating process were obtained by X-ray photoelectron spectroscopy (XPS) analysis. The coating mechanism of SiO2 on the surface of the BaSO4 particles and the coating process of TiO2 on the surface of SiO2 were explored. SiO2 formed at the early stage of the reaction was coated on the surface of BaSO4 by electrostatic adsorption, and the TiO2 produced by hydrolysis at the later stage was coated on the surface of SiO2 by chemical bonding, generating Ti-O-Si bonds at the interface between SiO2 and TiO2 particles, as well as a continuous dense TiO2 film by continuing the condensation reaction. A simple process and inexpensive raw materials were employed to realize the facile synthesis of BaSO4@SiO2@TiO2 composites with good dispersion and high whiteness, greatly reducing the amount of TiO2 used and the production cost, which has important guiding significance for production within the coating industry.

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Acknowledgments

The authors would like to thank Dr. Liu from Shiyanjia Lab (www.shiyanjia.com) for the XPS analysis.

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  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Guangyan Hu, Shengming Jin & Kun Liu

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  1. Guangyan Hu
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Correspondence to Shengming Jin or Kun Liu.

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Hu, G., Jin, S. & Liu, K. Facile synthesis of BaSO4@SiO2@TiO2 composites and its coating mechanism analysis. J Coat Technol Res 20, 2045–2052 (2023). https://doi.org/10.1007/s11998-023-00800-8

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  • DOI: https://doi.org/10.1007/s11998-023-00800-8

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