Modulation of the aggregation behaviour and physicochemical properties of 1-dodecyl-3-methylimidazolium bromide in aqueous solutions by β-CD

ABSTRACT

The modulation of aggregation behaviour of ionic liquids (ILs) in aqueous media is one of the important research topics. In the present work, aggregation behaviour of 1-dodecyl-3-methylimidazolium bromide ([C₁₂mim]Br) modulated by beta-cyclodextrin (β-CD) has been investigated by using conductivity, volume, fluorescence, dynamic light scattering and transmission electron microscopy techniques. The results suggested that the addition of β-CD significantly affects the aggregation of [C₁₂mim]Br in aqueous solutions. For example, the apparent critical micelle concentration increases with the increase of β-CD concentration; the average micellar size reduced with the increasing concentration of β-CD, and the process for micelle formation of [C₁₂mim]Br in aqueous β-CD solution is driven by entropy at lower temperature, while driven by enthalpy at higher temperature. It is expected that findings in this study would shed light on the potential applications of IL in supramolecular chemistry.

KEYWORDS:

• Ionic liquids
• aggregation
• physicochemical properties
• β-CD

Acknowledgements

The work was supported by the Foundation and Cutting-edge Research Projects of Henan Province: [Grant Number 162300410019] and the Doctoral Scientific Research Foundation of Xinxiang Medical University: [Grant Number 505062].

Disclosure statement

No potential conflict of interest was reported by the authors.

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Funding

This work was supported by the Doctoral Scientific Research Foundation of Xinxiang Medical University: [Grant Number 505062] and Foundation and Cutting-edge Research Projects of Henan Province: [Grant Number 162300410019].