Citation:
GUO Xing-Zhong, YAN Li-Qing, YANG Hui, LI Jian, LI Chao-Yu, CAI Xiao-Bo. Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition[J]. Acta Physico-Chimica Sinica,
;2011, 27(10): 2478-2484.
doi:
10.3866/PKU.WHXB20110925
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ZrO2 aerogels were successfully synthesized by the sol-gel process and ambient pressure drying using ZrO(NO3)2·5H2O as a precursor, 1,2-propylene oxide (PO) as a gelation agent, and formamide (FA) as a drying control chemical additive (DCCA). The prepared zirconia aerogel samples were characterized using differential thermal analysis (DTA), scanning electron microscopy (SEM), and nitrogen adsorption/desorption analysis. The results showed that the zirconia aerogels prepared by the propylene oxide addition method had a nanoscale porous network structure, as well as supercritical dried ones, with a low bulk density (202.08 kg·m-3) and a high surface area (645.0 m2·g-1). Propylene oxide can induce gelation through its nucleophilic property and its irreversible ring-opening reaction, and thus the sol-gel process and the state of gel can be controlled.
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Keywords:
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Aerogel
, - Zirconia,
- Ambient pressure drying,
- Propylene oxide,
- Sol-gel
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