Organic solvents induce the formation of oil-in-ionic liquid microemulsion aggregations

The Journal of Physical Chemistry. B
Yanan GaoLi Yu

Abstract

The role of four organic solvents in the formation process of 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4) based ionic liquid (IL) microemulsions is investigated. The results showed that the addition of Triton X-100 remarkably decreased the conductivity of bmimBF4. The added organic solvents provided a strong apolar environment for the hydrophobic tails of Triton X-100 and caused the surfactant molecules to aggregate into the interfacial film of oil-in-bmimBF4 (O/IL) microemulsions. As a result, the conductivities of the solutions were initially increased because the insulative Triton X-100 molecules were assembled, which corresponded to increasing the concentration of continuous bmimBF4 solutions. The hydrophobic interaction between the dispersed organic solvents and the hydrophobic tails of Triton X-100 may be the driving force for the formation of O/IL microemulsions. The droplets of O/IL microemulsions were successively swollen by organic solvents, and a bicontinuous IL-containing microemulsion was observed by freeze-fracture transmission electron microscopy for the first time. The current study can help in further understanding the ILs-containing microemulsions and thereby improve microemulsion theory.

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Citations

Jul 9, 2014·Soft Matter·Jianling ZhangBuxing Han
Jan 11, 2021·Ultrasonics Sonochemistry·Bruno L HennemannClarissa P Frizzo
May 18, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Oscar RojasJoachim Koetz
Dec 13, 2012·The Journal of Physical Chemistry. B·Jie XuWanguo Hou
Jul 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Dongfang LiuHongsheng Lu

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