物理化学学报 >> 2005, Vol. 21 >> Issue (02): 221-224.doi: 10.3866/PKU.WHXB20050223

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常压干燥法制备Al2O3块状气凝胶

徐子颉;甘礼华;庞颖聪;陈龙武   

  1. 同济大学化学系，上海　200092
  • 收稿日期:2004-07-21 修回日期:2004-09-21 发布日期:2005-02-15
  • 通讯作者: 甘礼华 E-mail:ganlh@tongji.edu.cn

Preparation of Al2O3 Bulk Aerogels by Non-supercritical Fluid Drying Technology

XU Zi-Jie;GAN Li-Hua;PANG Ying-Cong;CHEN Long-Wu   

  1. DepartmentofChemistry,TongjiUniversity,Shanghai　200092
  • Received:2004-07-21 Revised:2004-09-21 Published:2005-02-15
  • Contact: GAN Li-Hua E-mail:ganlh@tongji.edu.cn

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摘要： 以无机铝盐Al(H2O)9(NO3)3为前驱体，甲酰胺作为干燥控制化学添加剂(DCCA)，1,2-环氧丙烷作为凝胶网络诱导剂，通过溶胶-凝胶法制备氧化铝凝胶；在常压条件下对凝胶进行干燥，得到乳白色、半透明、轻质、块状氧化铝气凝胶.初步探讨了在凝胶制备和陈化过程中增强凝胶网络结构强度的途径和机理.

关键词: 气凝胶, 常压干燥法, Al2O3, 凝胶网络诱导剂

Abstract: Al2O3 bulk aerogels were prepared by using Al(H2O)9(NO3)3 as a precursor and 1,2-epoxy propane as a gelation agent. Methane amide was used as drying control chemical additives (DCCA) to improve the gel texture and the structure evolution. Wet gels were aged by a successively solvent exchanging of alcohol, tetra-ethylorthosilicate (TEOS)/alcohol and alcohol at a certain temperature. The aged gels were dried at the non-supercritical fluid drying condition to obtain bulk alumina aerogels. Those aerogels had high surface areas and porosity. The mechanism about drying Al2O3 wet gels at an ambient pressure was also discussed.

Key words: Aerogels, Drying at ambient pressure, Al2O3, Gel network inducing agent