Enhanced dispersion stability and mobility of carboxyl-functionalized carbon nanotubes in aqueous solutions through strong hydrogen bonds

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• 作者：Yeon Kyoung Bahk ; Xu He ; Emmanouil Gitsis ; Yu-Ying Kuo…
• 关键词：Carbon nanotubes ; Nanoparticle ; Dispersion ; Acetic environment ; Carboxylic functional group
• 刊名：Journal of Nanoparticle Research
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：17
• 期：10
• 全文大小：2,200 KB
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• 作者单位：Yeon Kyoung Bahk (1) (2)
  Xu He (1) (2)
  Emmanouil Gitsis (1)
  Yu-Ying Kuo (1) (2)
  Nayoung Kim (3)
  Jing Wang (1) (2)
  
  1. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
  2. Advanced Analytical Technologies, EMPA, 8600, Dübendorf, Switzerland
  3. Building Energy Materials and Components, EMPA, 8600, Dübendorf, Switzerland
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X

文摘

Dispersion of carbon nanotubes has been heavily studied due to its importance for their technical applications, toxic effects, and environmental impacts. Common electrolytes, such as sodium chloride and potassium chloride, promote agglomeration of nanoparticles in aqueous solutions. On the contrary, we discovered that acetic electrolytes enhanced the dispersion of multi-walled carbon nanotubes (MWCNTs) with carboxyl functional group through the strong hydrogen bond, which was confirmed by UV–Vis spectrometry, dispersion observations and aerosolization-quantification method. When concentrations of acetate electrolytes such as ammonium acetate (CH₃CO₂NH₄) and sodium acetate (CH₃CO₂Na) were lower than 0.03 mol per liter, MWCNT suspensions showed better dispersion and had higher mobility in porous media. The effects by the acetic environment are also applicable to other nanoparticles with the carboxyl functional group, which was demonstrated with polystyrene latex particles as an example. Keywords Carbon nanotubes Nanoparticle Dispersion Acetic environment Carboxylic functional group