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Published on: July 4, 2016
Step-freeze-drying method for carbon aerogels: a study of the effects on microstructure and mechanical property
Lei Hu1,2, Rujie He1,2, Zhang Lu1,2
1Institute of Advanced Structure Technology, Beijing Institute of Technology Beijing 100081 China herujie@bit.edu.cn.
Abstract:
In this paper, a novel step-freeze-drying method was used to prepare carbon aerogels. The effects of step-freeze-drying on the density, linear shrinkage, specific surface area, pore size distribution, microstructure and compressive strength of carbon aerogels were investigated, and compared to traditional freeze-drying methods. It was found that the step-freeze-drying method reduced the density, linear shrinkage and pore size of carbon aerogels compared to traditional freeze-drying. And it also improved the specific surface area, the microstructural homogenization and the compressive strength of carbon aerogels compared to traditional freeze-drying. It is therefore believed that step-freeze-drying is an efficient method to obtain carbon aerogels with fine microstructure and high mechanical property.
