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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 5/2014

01.05.2014 | Original Contribution

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

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

Erschienen in: Colloid and Polymer Science | Ausgabe 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.
Vorheriger Artikel Polyaniline precipitation in aqueous medium: from bulk aggregates to nanoparticles
Nächster Artikel Structural insights on nanoparticles containing gadolinium complexes as potential theranostic

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Metadaten
Titel
Micellization behavior of the ionic liquid lauryl isoquinolinium bromide in aqueous solution
verfasst von
Xiaohong Zhang
Xinying Peng
Lingling Ge
Lei Yu
Zhimin Liu
Rong Guo
Publikationsdatum
01.05.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 5/2014
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-013-3151-2

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