Synthesis and optical property of zinc aluminate spinel cryogels

Lifen Su, Lei Miao, Jibin Miao, Zhengzhi Zheng, Bin Yang, Ru Xia, Peng Chen, Jiasheng Qian

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 (ZnAl 2 O 4 ) 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 ZnAl 2 O 4 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.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalJournal of Asian Ceramic Societies
Volume4
Issue number2
DOIs
Publication statusPublished - 2016 Jun 1
Externally publishedYes

Keywords

  • Cryogels
  • Reflectance
  • Thermal insulating
  • Vacuum freeze drying

ASJC Scopus subject areas

  • Ceramics and Composites

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