Construction of carbon nanotube-based microcapsules by self-assembly

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• 作者：Liheng Xu (1)
  Ming Zhang (1)
  
• 关键词：Carbon nanotube ; Composite materials ; Microcapsule ; Self ; assembly
• 刊名：Environmental Chemistry Letters
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：12
• 期：2
• 页码：359-364
• 全文大小：
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• 作者单位：Liheng Xu (1)
  Ming Zhang (1)
  
  1. Department of Environmental Engineering, China Jiliang University, Hangzhou, 310018, China
  
• ISSN：1610-3661

文摘

Carbon nanotubes possess unique structures and outstanding properties. However, dispersion and manipulation of carbon nanotubes in solvents severely limit their application. A solution is building carbon nanotube-based microcapsules that combine both the properties of carbon nanotubes and capsules. Carbon nanotube-based microcapsules have indeed great potential applications including catalysts, adsorbents, and controlled-release materials. Here, we built carbon nanotube-based microcapsules by electrostatic self-assembly to develop novel composite materials. The construction and morphology of microcapsules were characterized by Raman spectroscopy, infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. Pre-films composed of poly(sodium 4-styrenesulfonate) and poly(diallyldimethylammoinum chloride) were assembled onto calcium carbonate (CaCO3) microparticles to construct positive solid templates. The carboxylated carbon nanotubes were then successfully assembled on the CaCO3 template using a self-assembly technique. Ethylene diamine tetraacetic acid (EDTA) was used as a powerful chelating agent to remove the CaCO3 cores by chelation between EDTA and calcium, thus completing the construction of carbon nanotube-based hollow microcapsules. The spherical shapes of the microcapsules were well retained, and the carbon nanotubes were anchored evenly in the polyelectrolyte layers.