摘要
六方氮化硼(h-BN)是一种类石墨结构的材料,因其具有优异的机械强度、较宽的带隙、较强的高温抗氧化性、优异的电绝缘性和突出的导热性而吸引了无数科研人员的青睐.但是,纳米尺度的h-BN分散性较差且极易团聚,影响其广泛应用.h-BN基气凝胶具有稳定的三维网络结构,低密度,可以作为高导热性超轻材料或导热聚合物添加剂.此外,h-BN基气凝胶具有可调的开放孔隙结构,高比表面积和可压缩性,可以作为理想的吸附材料,用于吸附空气或水中的有毒气体、重金属离子或者有机污染物等.本文结合国内外研究进展,归纳了h-BN基气凝胶的制备方法,如冷冻干燥法、化学气相沉积法、辅助模板法和复合交联法等,并对其在导热和吸附方面的应用作了详细的介绍.
Hexagonal boron nitride(h-BN)has the similar structure as graphitic material.It has excellent mechanical strength,wide band gap,high chemical oxidation resistance,good electrical insulation and outstanding thermal conductivity,and has attracted increasing attention of many researchers.However,nanoscale h-BN is difficult to disperse and easy to agglomerate in solution that greatly restricts its practical applications.h-BN based aerogels has low density,good mechanical strength and outstanding thermal conductivity that can be used as ultralight thermal conductive materials or act as thermal conductive fillers in polymer.In addition,h-BN based aerogels possess adjustable porous structure,high specific surface area and compressibility,which can be used as an ideal adsorption material to absorb the toxic gas in air or heavy metal ions and organic pollutions in water.Based on the research progress at home and abroad,this article summarizes the preparation methods of h-BN based aerogels,such as freeze-drying method,chemical vapor deposition(CVD)process,template method,and composite crosslinking method,etc.Finally,the applications of the h-BN based aerogels in heat transfer and adsorption are disccussed in detail.
作者
赵召
屈孟男
白常宁
安璐璐
于元烈
Zhao Zhao;Mengnan Qu;Changning Bai;Lulu An;Yuanlie Yu(Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《中国科学：化学》
CAS
CSCD
北大核心
2020年第8期891-899,共9页
SCIENTIA SINICA Chimica
关键词
六方氮化硼
气凝胶
导热
吸附性能
hexagonal boron nitride
aerogel
thermal conductivity
adsorption property
作者简介
通讯作者:于元烈,E-mail:yuanliehll@licp.cas.cn。
