气凝胶
石墨烯
材料科学
电磁屏蔽
微波食品加热
微尺度化学
比表面积
吸收(声学)
纳米颗粒
氧化物
纳米技术
衰减
化学工程
复合材料
催化作用
光学
化学
物理
工程类
数学教育
数学
量子力学
冶金
生物化学
作者
Xiaohan Wu,Jing Lyu,Hong Guo,Xiang-cui Liu,Xuetong Zhang
出处
期刊:Langmuir
[American Chemical Society]
日期:2018-06-29
卷期号:34 (30): 9004-9014
被引量:17
标识
DOI:10.1021/acs.langmuir.8b01410
摘要
Bulk graphene aerogels with high electrical conductivity, ultralow density, and high specific surface area have attracted significant attention because of their fascinating performances in energy storage, catalysis, absorption, sensor, electromagnetic shielding, etc. However, graphene aerogel microgranules (i.e., reducing the size of the bulk aerogels into microscale) and their performances in the electromagnetic field have been ignored. Herein, we report a new strategy to make floatable graphene aerogel microgranules with high hydrophobicity (137°), low density (13.5 mg/cm3), and high specific surface area (516 m2/g). These microgranules were synthesized initially from reduced graphene oxide (rGO) hydrogel microparticles and then in situ-modified by silica nanoparticles. Further investigations have demonstrated that the resulting silica-modified rGO aerogel microgranules possess highly efficient static electromagnetic screening (average 30.3 dB in 8–18 GHz) and dynamic infrared shielding (higher than 10 dB during floatation in air for 15 min) properties. The work reported here should give much inspiration to make more functional aerogel microgranules used in various emerging fields.
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