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Unstable Supramolecular Structure of [Bmim][BF4] in Aqueous Solution

Authors

  • Bo Wu Dr.,

    1. State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai 201620 (China), Fax: (+86) 021-6779-2950
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  • Li Zhang Dr.,

    1. Center of Analysis and Measurement, Donghua University, Northern Ren-ming Road 2999, Shanghai 201620 (China)
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  • Yu Mei Zhang Prof.,

    1. State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai 201620 (China), Fax: (+86) 021-6779-2950
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  • Hua Ping Wang Prof.

    1. State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai 201620 (China), Fax: (+86) 021-6779-2950
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  • [Bmim][BF4]=1-butyl-3-methylimidazolium tetrafluoroborate.

Abstract

To unravel the exact composition and structure of aggregates in an aqueous solution of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), we performed static and dynamic light-scattering measurements, as well as transmission electron microscopy (TEM). Results from this work show that the aggregates are vesicles and unstable; herein, we discuss the driving force behind the self-assembly. Apart from the van der Waals forces and repulsive electrostatic interactions between adjacent cation clusters, the hydrogen-bonding forces as well as counterion effects might also contribute to this driving force. The information obtained here is useful for a better understanding of the vital role that aggregation behavior plays in the field of ionic liquid recovery, and its potential use in controlled release, drug delivery, and petroleum recovery.

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