以环氧化合物为凝胶促进剂制备块状氧化铁气凝胶

Preparation of Monolithic Ferrite (Ⅲ) Oxide Aerogel by CO2 Supercritical Drying Process

  • 摘要: 以无机铁盐FeCl3为前驱体,环氧丙烷及其衍生物作为凝胶促进剂,采用溶胶-凝胶工艺制备氧化铁凝胶。以氯化铁的醇溶液为前驱体、环氧化合物为凝胶促进剂,制备氧化铁的醇凝胶,通过CO2超临界干燥工艺得到氧化铁气凝胶。用透射电镜(TEM)对气凝胶微观结构的表征结果表明,气凝胶样品主要由超细微粒堆积而成。BET和BJH测试结果表明,气凝胶样品平均孔径为9.4~18.3 nm,比表面积为430~500 m2/g。

     

    Abstract: Monolithic ferrite(Ⅲ) oxide aerogels were prepared from inorganic salt precursors by hydrolysis and condensation. The preparation process is straightforward, inexpensive and versatile, and the monolithic mesoporous materials with high specific surface areas and very low bulk density can be produced. Dried ferrite(Ⅲ) aerogel was characterized by transmission electron microscopy(TEM) and nitrogen adsorption/desorption analyses. The average pore diameter is in the range of 9.4-18.3 nm, and the specific surface area is 430-500 m2/g for the ferrite(Ⅲ) aerogel.

     

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