您好!欢迎来到中国粉体网
登录 免费注册

技术中心

各向异性和轻量级碳石墨烯复合气凝胶的高效热绝缘和电磁干扰屏蔽
2022-10-09     来源:四川垦业科技发展有限公司   >>进入该公司展台 

请联系 产品经理:13689651620(V) 索取原文。

ABSTRACT: High-performance and lightweight carbon aerogels (CAs) have attracted considerable attention in various fields such as electrochemistry, catalysis, adsorption, energy storage, and so on. However, finding an environmentally friendly and efficient preparation method and achieving a controllable performance of CAs are still a challenge. Herein, a series of anisotropic carbon/ graphene composite aerogels were synthesized by unidirectional freezing of polyamic acid ammonium salt/graphene oxide (PAS/ GO) suspension followed by lyophilization, thermal imidization, and carbonization. The prepared aerogels presented a tubular pore structure oriented along the freezing direction. The GO dispersed in the polymer matrix reinforced the skeleton of aerogels, which significantly inhibited the volume shrinkage during the preparation process, thus giving low densities of 0.0740.185 g cm3. In addition, the oriented pore structure endowed the composite aerogels with obviously anisotropic heat insulation performance. The radial thermal conductivity was as low as 0.038 W m1 K1 at the density of 0.074 g cm3. When the initial content of GO rose to 20 phr, the resultant aerogels exhibited a high electrical conductivity of about 0.77 S cm1 in the radial direction and the electromagnetic interference shielding effectiveness (EMI SE) reached 54.6 dB at the same time. Therefore, this study provided a facile and environmentally friendly method to prepare lightweight and anisotropic carbon aerogels. KEYWORDS: graphene oxide, polyimide, carbon aerogel, anisotropy, thermal insulation, electromagnetic interference shielding

- END -

1574

0
热门资料下载
研究文献
专业论文
关于我们 联系我们 服务项目 隐私策略 加入我们 用户反馈 友情链接

Copyright©2002-2024 Cnpowder.com.cn Corporation,All Rights Reserved 隐私保护 中国粉体网 版权所有 京ICP证050428号