碳纳米管
材料科学
海绵
大孔隙
介孔材料
复合材料
化学工程
涂层
抗压强度
纳米管
纳米技术
多孔性
吸附
介孔二氧化硅
催化作用
有机化学
化学
工程类
生物
植物
作者
Yanbing Yang,Enzheng Shi,Peixu Li,Dehai Wu,Shiting Wu,Yuanyuan Shang,Wenjing Xu,Anyuan Cao,Quan Yuan
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:6 (7): 3585-3585
被引量:33
摘要
Applications of mesoporous silica (m-SiO2) have suffered from its fragility (monolithic m-SiO2 easily collapses under compression) and limited internal molecular exchange through small channels. Previously reported hierarchical porous m-SiO2 structures containing interconnected macropores could improve adsorption properties, but they were still intrinsically fragile without sufficient mechanical strength to sustain deformation. Here, we embed a three-dimensional carbon nanotube (CNT) skeleton into m-SiO2 to fabricate bulk, robust sponges that can be compressed to large strains (60% volume reduction) repeatedly in both air and water. This is done by directly casting a uniform m-SiO2 layer with tunable thickness onto the surface of CNTs while maintaining the original network and open porous structure, resulting in a core–shell CNT@m-SiO2 hybrid sponge. By pumping fluid through the CNT@m-SiO2 sponges under cyclic compression, the adsorption rate and efficiency of dye molecules can be significantly enhanced due to the mesoporous coating on CNTs and enhanced fluid exchange throughout internal pores. The CNT@m-SiO2 sponges may be used as robust and flexible adsorption media, and chemical and biological sensors with high performance.
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