Micellization Behavior of Surface Active Ionic Liquids Having Aromatic Counterions in Aqueous Media

The Journal of Physical Chemistry. B
Gurbir SinghTejwant Singh Kang

Abstract

Amphiphilic ionic liquids (ILs) based on 3-hexadecyl-1-methyl imidazolium cation, [C16mim](+), having aromatic anions, 4-hydroxybenzenesulfonate, [HBS], benzenesulfonate, [BS], and p-toluenesulfonate, [PTS], as counterions have been synthesized and investigated for their micellization behavior in aqueous medium. The surface activity of investigated ILs has been established by surface tension measurements, whereas bulk behavior has been investigated by conductivity and steady-state fluorescence measurements. The investigated ILs exhibited 2-3 fold lower critical micelle concentration (cmc) as compared to analogous ILs or conventional surfactants with nonaromatic counterions. The polarity of the cybotactic region of pyrene decreases along with decrease in extent of water penetration toward palisade layer of micelle with increase in hydrophobicity of counterion. Relatively more hydrophobic anions, i.e., [BS](-) and [PTS](-), have been found to form excimer in palisade layer of micelle, whereas [HBS](-) remains in close vicinity of imidazolium head groups of micelle as established from inherent fluorescence of aromatic anions. Isothermal titration calorimetry measurements have provided insights into thermodynamics of micelles. The ...Continue Reading

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Citations

Jul 23, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Aoli WuLiqiang Zheng
Jan 26, 2017·The Journal of Physical Chemistry. B·Vijay Raghavan, Prasad L Polavarapu
May 19, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Arghajit PyneNilmoni Sarkar
Jun 14, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·M Teresa GarciaFrancesc Comelles
Feb 20, 2018·Chemical Communications : Chem Comm·Gurbir SinghTejwant Singh Kang
May 11, 2019·Journal of Colloid and Interface Science·Md Korban AliMasahiro Goto
May 12, 2021·Journal of Molecular Recognition : JMR·Robert J FalconerAnthony K Mittermaier
Oct 18, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Onkar SinghRakesh Kumar Mahajan

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