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Two-dimensional electrolyte nature of exfoliated montmorillonite nanoplatelets fabricated by soap-free emulsion polymerization and their affinity for cations

Authors

  • Chia-Hsin Lee,

    1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
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  • Ting Hsiang Weng,

    1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
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  • Ken Yen Liu,

    1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
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  • Keng Jen Lin,

    1. Institute of Polymer Science and Engineering, National Taiwan University, Taipei Taiwan, Republic of China
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  • King-Fu Lin

    Corresponding author
    1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
    2. Institute of Polymer Science and Engineering, National Taiwan University, Taipei Taiwan, Republic of China
    • Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic Of China
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Abstract

Montmorillonite (MMT) nanoplatelets, fabricated by the exfoliation of MMT during participating in the soap-free emulsion polymerization of methyl methacrylate, were well-dispersed in water and performed like a two-dimensional electrolyte. Their ionic conductivity roughly follows the Manning's limiting law for the conduction of a polyelectrolyte. The dissociated MMT nanoplatelets that carry negative charges in water were able to rapidly adsorb cations, such as tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)math image) and methylene blue (MB+), and recover into a smectic configuration floating as a separating phase. By using the Langmuir equation, we were able to estimate the occupied surface areas of MMT nanoplatelets by each Ru(bpy)math image and MB+ cations as 4.708 and 1.806 nm2/ion, respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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