添加环氧丙烷法常压干燥制备ZrO2气凝胶

doi:10.3866/PKU.WHXB20110925

Abstract

Abstract: 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.

Key words: Aerogel, Zirconia, Ambient pressure drying, Propylene oxide, Sol-gel

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 Phys. -Chim. Sin. 2011, 27(10), 2478-2484. doi: 10.3866/PKU.WHXB20110925

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Synthesis of Zirconia Aerogels by Ambient Pressure Drying with Propylene Oxide Addition

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