Preparation and Properties of TiO2-Coated Hollow Glass Microspheres as Thermal Insulation Materials for Energy-Saving Buildings

Chunyu Wu; Weilin Wang; Huiming Ji

doi:10.1007/s12209-019-00220-z

Transactions of Tianjin University ›› 2020, Vol. 26 ›› Issue (4) : 283 -291. DOI: 10.1007/s12209-019-00220-z

Research Article

Preparation and Properties of TiO₂-Coated Hollow Glass Microspheres as Thermal Insulation Materials for Energy-Saving Buildings

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¹ Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, 300072, Tianjin, China

^c jihuiming@tju.edu.cn

Chunyu Wu is a postgraduate in the School of Materials Science and Engineering at Tianjin University. She received her B.S. in material science and engineering at Tianjin University in 2017. Her current research focuses on inorganic thermal insulation materials and composite thermal insulation coatings.

Weilin Wang is a postgraduate in the School of Materials Science and Engineering at Tianjin University. He obtained his B.S. in material science and engineering at Tianjin University in 2018. His current research focuses on composite silica aerogel and thermal insulation materials.

Huiming Ji is a professor in the School of Materials Science and Engineering at Tianjin University. He received his B.S. and M.S. in material Science at Tianjin University. He obtained his Ph.D. in material science at Tianjin University in 2002. After completing his M.S. in material science, he joined Tianjin University as a lecturer. Then, he took his professorship in 2011. His current research focuses on integration of inorganic materials of structure and function and advanced functional ceramics.

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Abstract

A hollow glass microsphere (HGM)/TiO₂ composite hollow sphere was successfully prepared via a simple precipitation method. The TiO₂ coating layers grew on the surface of the HGMs that range from 20 to 50 μm in diameter as nanoparticles with the formation of the Si‒O‒Ti bonds. The growth mechanism accounting for the formation of the TiO₂ nanolayers was proposed. The morphology, composition, thermal insulation properties, and visible–near infrared (VIS–NIR) reflectance of the HGMs/TiO₂ composite hollow spheres were characterized. The VIS–NIR reflectance of the HGMs/TiO₂ composite hollow spheres increased by more than 30% compared to raw HGMs. The thermal conductivity of the particles is 0.058 W/(m K). The result indicates that the VIS–NIR reflectance of the composite hollow spheres is strongly influenced by the coating of TiO₂. The composite hollow spheres were used as the main functional filler to prepare the organic–inorganic composite coatings. The glass substrates coated by the organic–inorganic coatings had lower thermal conductivity and higher near infrared reflectivity. Therefore, the HGMs/TiO₂ composite hollow spheres can reflect most of the solar energy and effectively keep out the heat as a thermal insulation coating for energy-saving constructions.

Keywords

TiO₂ / Hollow glass microspheres / Thermal insulation materials / Near infrared reflectance

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Chunyu Wu, Weilin Wang, Huiming Ji. Preparation and Properties of TiO₂-Coated Hollow Glass Microspheres as Thermal Insulation Materials for Energy-Saving Buildings. Transactions of Tianjin University, 2020, 26(4): 283-291 DOI:10.1007/s12209-019-00220-z

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