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Dispersion of multiwalled carbon nanotubes (MWCNTs) by ionic liquid-based Gemini pyrrolidinium surfactants in aqueous solution

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Abstract

Gemini pyrrolidinium surfactants ([C n py-4-C n py][Br2]) are a new kind of ionic liquid-based Gemini surfactants. Multiwalled carbon nanotubes (MWCNTs) can be dispersed effectively in [C n py-4-C n py][Br2] aqueous solution. The resulting MWCNT suspensions are stable for more than 1 month, and no precipitation is observed. Ultraviolet–visible–near infrared (UV–Vis–NIR) spectra are performed to determine the dispersion of MWCNTs and the optimal concentration (C opt) of [C n py-4-C n py][Br2]. Compared with C n MPB, [C n py-4-C n py][Br2] is more effective in dispersing MWCNTs. It was also observed that [C n py-4-C n py][Br2] with a longer hydrocarbon chain displays a stronger dispersion ability. The adsorption of [C n py-4-C n py][Br2] on MWCNTs is investigated by zeta-potential and surface tension measurements. The zeta-potential results show that MWCNTs dispersed in [C n py-4-C n py][Br2] aqueous solution have relatively high positive charges. It is the electrostatic repulsion force between the MWCNTs which makes them stable. Furthermore, a possible dispersion mechanism is proposed.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (No. 50972080), National Basic Research Program (2009CB930101). And this work was partially supported by Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS.

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Authors and Affiliations

  1. Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan, 250100, China

    Shaohua Zhang, Fei Lu & Liqiang Zheng

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  1. Shaohua Zhang
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  2. Fei Lu
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  3. Liqiang Zheng
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Correspondence to Liqiang Zheng.

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Zhang, S., Lu, F. & Zheng, L. Dispersion of multiwalled carbon nanotubes (MWCNTs) by ionic liquid-based Gemini pyrrolidinium surfactants in aqueous solution. Colloid Polym Sci 289, 1815–1819 (2011). https://doi.org/10.1007/s00396-011-2500-2

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  • DOI: https://doi.org/10.1007/s00396-011-2500-2

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