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Colloid and Polymer Science

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01-05-2014 | Original Contribution

Micellization behavior of the ionic liquid lauryl isoquinolinium bromide in aqueous solution

Authors: Xiaohong Zhang, Xinying Peng, Lingling Ge, Lei Yu, Zhimin Liu, Rong Guo

Published in: Colloid and Polymer Science | Issue 5/2014

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Abstract

The micellization behavior of the ionic liquid lauryl isoquinolinium bromide ([C₁₂iQuin]Br) in aqueous solution has been assessed using surface tension, electrical conductivity, and ¹H nuclear magnetic resonance (NMR) measurements. The results reveal that the critical micelle concentration (CMC) and constant surfactant tension (γ _cac) are lower than that of butyl isoquinolinium bromide ([C₄iQuin]Br), octyl isoquinolinium bromide ([C₈iQuin]Br, and lauryl pyridinium bromide ([C₁₂Pyr]Br). ¹H NMR spectra show the evidence of paralleled π-stacking of adjacent isoquinoline rings. To elucidate the effect of the π–π interactions on the aggregation process, thermodynamic parameters such as the standard free energy, enthalpy, and entropy of aggregation have been discussed. These parameters are evaluated from the CMC with temperature by fitting these values to expressions derived from a micellization thermodynamic model. The enthalpy–entropy compensation phenomenon has been observed in the micellization process of [C₁₂iQuin]Br in water, and the presence of isoquinoline cations is responsible for the decrease in the ΔH _mic ^∗ , compared with [C₁₂Pyr]Br which has the same alkyl chain and counter-ion.

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Title: Micellization behavior of the ionic liquid lauryl isoquinolinium bromide in aqueous solution
Authors: Xiaohong Zhang
Xinying Peng
Lingling Ge
Lei Yu
Zhimin Liu
Rong Guo
Publication date: 01-05-2014
Publisher: Springer Berlin Heidelberg
Published in: Colloid and Polymer Science / Issue 5/2014
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI: https://doi.org/10.1007/s00396-013-3151-2

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