物理化学学报 >> 2011, Vol. 27 >> Issue (10): 2478-2484.doi: 10.3866/PKU.WHXB20110925

材料物理化学 上一篇    下一篇

添加环氧丙烷法常压干燥制备ZrO2气凝胶

郭兴忠, 颜立清, 杨辉, 李建, 李超宇, 蔡晓波   

  1. 浙江大学材料科学与工程学系, 杭州 310027
  • 收稿日期:2011-05-25 修回日期:2011-06-14 发布日期:2011-09-27
  • 通讯作者: 杨辉 E-mail:yanghui@zju.edu.cn
  • 基金资助:

    浙江省重点创新团队项目(2009R50010)资助

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

GUO Xing-Zhong, YAN Li-Qing, YANG Hui, LI Jian, LI Chao-Yu, CAI Xiao-Bo   

  1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2011-05-25 Revised:2011-06-14 Published:2011-09-27
  • Contact: YANG Hui E-mail:yanghui@zju.edu.cn
  • Supported by:

    The project was supported by the Key Innovation Team Project of Zhejiang Province, China (2009R50010).

摘要: 以无机锆盐硝酸氧锆(ZrO(NO3)2·5H2O)为前驱体, 1,2-环氧丙烷(PO)为凝胶促进剂, 甲酰胺(FA)为干燥控制化学添加剂(DCCA), 采用溶胶-凝胶法并通过常压干燥制备了轻质二氧化锆(ZrO2)气凝胶, 利用差热分析(DTA)、扫描电镜(SEM)、N2吸附/脱附等测试技术对所制得的ZrO2气凝胶进行了表征. 结果表明: 添加环氧丙烷常压干燥制得的ZrO2气凝胶具有纳米尺寸的多孔网络结构, 表观密度可低至202.08 kg·m-3, 比表面积可高达645.0 m2·g-1, 与超临界干燥效果相当. 环氧丙烷因其环氧原子的强亲核性和不可逆的开环反应, 可促进凝胶化, 并通过环氧丙烷的量控制反应过程和凝胶状态.

关键词: 气凝胶, ZrO2, 常压干燥, 环氧丙烷, 溶胶-凝胶

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

MSC2000: 

  • O647