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

Bahk, Yeon ; He, Xu ; Gitsis, Emmanouil ; Kuo, Yu-Ying ; Kim, Nayoung ; Wang, Jing

In: Journal of Nanoparticle Research, 2015, vol. 17, no. 10, p. 1-13

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    Titre
    • Enhanced dispersion stability and mobility of carboxyl-functionalized carbon nanotubes in aqueous solutions through strong hydrogen bonds
    Auteur
    • Bahk, Yeon. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
    • He, Xu. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
    • Gitsis, Emmanouil. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
    • Kuo, Yu-Ying. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
    • Kim, Nayoung. Building Energy Materials and Components, EMPA, 8600, Dübendorf, Switzerland
    • Wang, Jing. Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Nanoparticle Research, 2015, vol. 17, no. 10, p. 1-13. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331157
    Summary
    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 0.03mol 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.