Unstable Supramolecular Structure of [Bmim][BF4] in Aqueous Solution.
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.
State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai, 201620, China.
Bo
B
Wu
Center of Analysis and Measurement, Donghua University, Northern Ren-ming Road 2999, Shanghai, 201620, China.
Li
L
Zhang
State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai, 201620, China.
Yu Mei
YM
Zhang
State Key Laboratory for Modification of, Chemical Fiber and Polymer Materials, Donghua University, Northern Ren-ming Road 2999, Shanghai, 201620, China.
Hua Ping
HP
Wang