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

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Abstract

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.

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Acknowledgments

This study was partially supported by the Swiss National Science Foundation (NFP 64), “Evaluation platform for safety and environment risks of carbon nanotube reinforce nanocomposites,” 406440_131286.

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Authors and Affiliations

  1. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland

    Yeon Kyoung Bahk, Xu He, Emmanouil Gitsis, Yu-Ying Kuo & Jing Wang

  2. Advanced Analytical Technologies, EMPA, 8600, Dübendorf, Switzerland

    Yeon Kyoung Bahk, Xu He, Yu-Ying Kuo & Jing Wang

  3. Building Energy Materials and Components, EMPA, 8600, Dübendorf, Switzerland

    Nayoung Kim

Authors
  1. Yeon Kyoung Bahk
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  2. Xu He
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  3. Emmanouil Gitsis
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  4. Yu-Ying Kuo
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  5. Nayoung Kim
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  6. Jing Wang
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Correspondence to Jing Wang.

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Bahk, Y.K., He, X., Gitsis, E. et al. Enhanced dispersion stability and mobility of carboxyl-functionalized carbon nanotubes in aqueous solutions through strong hydrogen bonds. J Nanopart Res 17, 396 (2015). https://doi.org/10.1007/s11051-015-3203-2

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