炭气凝胶的分步冷冻干燥法：对微观结构和力学性能影响的研究

Step-freeze-drying method for carbon aerogels: a study of the effects on microstructure and mechanical property.

作者信息

Hu Lei, He Rujie, Lu Zhang, Zhang Keqiang, Bai Xuejian

机构信息

Institute of Advanced Structure Technology, Beijing Institute of Technology Beijing 100081 China

Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology Beijing 100081 China.

出版信息

RSC Adv. 2019 Mar 29;9(18):9931-9936. doi: 10.1039/c9ra01328h. eCollection 2019 Mar 28.

DOI:10.1039/c9ra01328h

PMID:35520908

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9062306/

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.

摘要

本文采用一种新型的分步冷冻干燥法制备碳气凝胶。研究了分步冷冻干燥对碳气凝胶密度、线性收缩率、比表面积、孔径分布、微观结构和抗压强度的影响，并与传统冷冻干燥法进行了比较。结果发现，与传统冷冻干燥相比，分步冷冻干燥法降低了碳气凝胶的密度、线性收缩率和孔径。而且与传统冷冻干燥相比，它还提高了碳气凝胶的比表面积、微观结构均匀性和抗压强度。因此，可以认为分步冷冻干燥是一种获得具有精细微观结构和高机械性能的碳气凝胶的有效方法。