Nanostructured zinc aluminates: A promising material for cool roof coating

• Main Authors: Sameera, S., Vidyadharan, Viji, Sasidharan, Sajesh, Gopchandran, K.G.
• Format: Article
• Language: English
• Published: H. : ĐHQGHN 2020
• Subjects: Zinc aluminate; Nanocrystalline materials; Citrate-sol gel method; NIR reflectance; Cool coating
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/76694; https://doi.org/10.1016/j.jsamd.2019.10.003
• Institution: Vietnam National University, Hanoi

Nanostructured zinc aluminate pigments were synthesized using a citrate solegel method. All the samples were annealed at 600 C, 700 C, 800 C, and 1100 C for 6 h, respectively. The as-synthesized samples were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), UVeViseNIR spectroscopy and CIE L*a*b* color analysis. The phase purity and structural analysis of the zinc aluminates were confirmed using X-ray diffraction and Rietveld refinement. The morphological and microchemical analysis was done using FESEM, TEM and EDX. The particle size and reflectance properties are found to be sensitive to the annealing temperature. The samples exhibited a total solar reflectance of about 85%. An attempt was also made to compare the total solar reflectance of the synthesized zinc aluminates with that of commercially available TiO2 by applying over a concrete cement surface.