Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (11): 20250185.doi: 10.7503/cjcu20250185

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Fabrication of High-reflectance and Low-thermal-conductivity HGM@TiO₂@ZnO Core-shell-shell Material via Rotational Coating

QI Wenjia1, ZHAO Kaiqing2, WU Gang2, WUMAIER·Yasen 1(), TONG Gangsheng2,3()   

  1. 1.School of Chemistry and Chemical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China
    2.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
    3.Shanghai Aerospace Equipments Manufacturer Co. Ltd. ,Shanghai,200245,China
  • Received:2025-07-02 Online:2025-11-10 Published:2025-09-11
  • Contact: WUMAIER·Yasen E-mail:omerjan@sues.edu.cn;tgs@sjtu.edu.cn
  • Supported by:
    the Program of Shanghai Academic/Technology Research Leader, China(23XD1431800);the Shanghai Young College Teachers Training Funding Program, China(0234-A1-0100-25-QP034)

Abstract:

Hollow glass microspheres(HGM) was utilized as the substrate and sequentially was coated with eggshell-like TiO₂ and needle-like nano-ZnO through a rotational coating process and a two-step heterogeneous precipitation method, constructing a high-reflectance, low-thermal-conductivity core-shell-shell material HGM@TiO2@ZnO. Research demonstrates that the obtained HGM@TiO₂@ZnO exhibits a hollow core structure that reduces heat transfer efficiency. The dual-shell structure, comprising high and low refractive index layers, induces multi-level reflection and scattering of light, while the cavity structures formed between the needle-like nano-ZnO further decrease the thermal conductivity of HGM@TiO₂@ZnO, achieving a dual synergistic effect of "reflection-thermal insulation". Results indicate that the HGM@TiO₂@ZnO material achieves an average solar reflectance up to 88.64% in the visible-near-infrared(380—2500 nm) range, representing improvements of 25.6%, 6.2%, and 10.0% compared to HGM, HGM@TiO₂, and physically blended material HGM&TiO₂&ZnO, respectively. When HGM@TiO₂@ZnO was added to an acrylic resin matrix at volume fraction of 40%, the resulting coating exhibited an average solar reflectance of 72.86% and a thermal conductivity as low as 0.08 W·m-1·K-1. Compared to coatings with the same volume fraction of HGM added to the acrylic resin, the reflectance increased by 5.4%, while the thermal conductivity decreased by 34%. Thus, this study elucidates the synergistic regulation mechanism of the core-shell-shell hierarchical structure on photothermal performance, providing theoretical support and material foundations for the development of high-efficiency thermal-reflective and insulating functional coatings.

Key words: Hollow glass microsphere, Core-shell material, Solar reflectance, Thermal conductivity, Coating

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