ZnO nanostructures decorated hollow glass microspheres as near infrared reflective pigment. Issue 12 (15th August 2017)

• Record Type: Journal Article
• Authors: Lu, Denghui; Gao, Qiang; Wu, Xiaomei; Fan, Yueming
• Is Part Of: Ceramics international. Volume 43:Issue 12(2017)
• Page Start: 9164
• Page End: 9170
• Publication Date: 2017-08-15
• Subjects: Hollow glass microsphere -- ZnO -- Thermal insulation -- Near-infrared reflectance -- Coating -- Composite pigment; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.04.067
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Hollow glass microsphere/ZnO composite pigments were successfully prepared by a facile sol-gel method. ZnO coating layers composed of nanosheets, nanoplates, or nanoparticles were anchored at the surface of hollow glass microspheres by formation of Zn-O-Si bond. A reasonable growth mechanism for elucidating the formation of ZnO nanocoating was proposed. The results indicated that the near-infrared reflectance property of the composite pigments was strongly affected by the morphology of ZnO nanostructures. The nanoparticles structures exhibited higher near-infrared reflectance than that of nanosheets and nanoplates structures. The near-infrared solar reflectance of hollow glass microsphere/ZnO composite pigments was 95.7%, while the total solar reflectance of the composite pigment was as high as 97.2%. An approximately 11.1 °C decrease in outer surface temperature was obtained for the heat box coated with composite pigments. Therefore, hollow glass microsphere/ZnO composites are excellent near infrared reflective pigments for efficient solar reflective coatings designed for building facades and roofs.