Synthesis and optical property of zinc aluminate spinel cryogels*. Issue 2 (1st June 2016)

• Record Type: Journal Article
• Authors: Su, Lifen; Miao, Lei; Miao, Jibin; Zheng, Zhengzhi; Yang, Bin; Xia, Ru; Chen, Peng; Qian, Jiasheng
• Is Part Of: Journal of Asian ceramic societies. Volume 4:Issue 2(2016)
• Page Start: 185
• Page End: 190
• Publication Date: 2016-06-01
• Subjects: Reflectance -- Vacuum freeze drying -- Cryogels -- Thermal insulating; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1016/j.jascer.2016.03.001
• Languages: English
• ISSNs: 2187-0764

Abstract

Abstract: Zinc aluminate spinel cryogels with various molar ratio of Al/Zn are synthesized by sol–gel technology followed by vacuum freeze drying. The structures and optical properties are both found to be affected by the molar ratios of Al/Zn and annealed temperatures. The peaks of zinc oxide (ZnO) and zinc dialuminum oxide (ZnAl2 O4 ) are both obtained for the samples with more Zn content annealed at 750 °C or upward. The composites have a large surface area (137 m 2 /g) with mesoporous structure after annealing at 750 °C. The SEM images reveal that the ZnAl2 O4 crystals formed a multilayer structure with redundant ZnO particles which deposited on it. Furthermore, the maximum infrared reflectance is about 80% with an improvement of 35% in the infrared region after annealing at 950 °C compared with that of 450 °C, which indicates that these porous cryogels have a potential application as thermal insulating materials at a high temperature.