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Influence of the hydrocarbon chain length of imidazolium-based ionic liquid on the dispersion and stabilization of double-walled carbon nanotubes in water

Abstract : Imidazolium-based ionic liquids with a long hydrocarbon chain 1-methyl-1-ethanol-2-alkyl-imidazolium iodide ([M-E-Cn-Im] I, n = 13, 15 and 17) were used for the dispersion of DWCNTs in water.DWCNTs suspensions obtained were stable for more than a month, and no sedimentation was observed.The stability of the suspensions was investigated (measurement of optical density, zeta potential, parti-cle size, viscosity, and TEM images). Monitoring of the absorbance by UV/vis spectrophotometry for 20days showed that at low concentration (1 mM), the best suspension was obtained with the ionic liquid([M-E-C15-Im] I). At higher concentration (10 mM), the dispersion efficiency increased with the length ofthe hydrocarbon chain. This could be explained by the hydrophobic interaction between the hydrophobicmoieties of the ionic liquid and the CNTs. Therefore, we were able to stabilize DWCNTs using a low con-centration (1 mM) of imidazolium-based ionic liquids synthesized from natural compounds. This workhighlights the potential of imidazolium-based ionic liquids for the preparation of aqueous suspensionsof DWCNTs at high concentration with a limited amount of added surfactant (50 mg/L of DWCNTs with50 mg/L of ionic liquid).
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https://hal.archives-ouvertes.fr/hal-01475298
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Submitted on : Thursday, February 23, 2017 - 3:47:54 PM
Last modification on : Wednesday, November 25, 2020 - 10:06:08 PM
Long-term archiving on: : Wednesday, May 24, 2017 - 2:24:16 PM

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Kenza Raiah, Abdelkader Djalab, Amel Hadj-Ziane-Zafour, Brigitte Soula, Anne-Marie Galibert, et al.. Influence of the hydrocarbon chain length of imidazolium-based ionic liquid on the dispersion and stabilization of double-walled carbon nanotubes in water. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2015, vol. 469, pp. 107-116. ⟨10.1016/j.colsurfa.2015.01.015⟩. ⟨hal-01475298⟩

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