Solvation, rotational relaxation and fluorescence correlation spectroscopic study on ionic liquid-in-oil microemulsions containing triple-chain surface active ionic liquids (SAILs)

Chiranjib Banerjee, Niloy Kundu, Arpita Roy, Debasis Banik, Mintu Halder, Nilmoni Sarkar

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Abstract

In this article, solvation dynamics and rotational relaxation approaches have been applied to explore the microheterogeneity of surface active ionic liquid (SAIL) containing microemulsions, i.e., [P13][Tf2N]/[BHD][AOT]/[IPM] and [N3111][Tf2N]/[BHD][AOT]/[IPM], using coumarin 480 (C-480) as a probe molecule. The average solvation time constants of Coumarin-480 (C-480) decreases with an increase in R value (R = [P13][Tf2N] or [N3111][Tf2N]/[BHD][AOT]) at a temperature of 25 °C for both the systems. This is attributed to the movement of the probe molecules from the interface to the pool of the microemulsion. However, the rotational relaxation time of the probe molecules (C-480) increases with increasing value of R as the pool of the microemulsion is more viscous compared to the interfacial region. Besides these, for the first time, we have measured the diffusion coefficients of these novel aggregates applying fluorescence correlation spectroscopic technique. The decrease in diffusion coefficients (Dt) with increase in R confirms the swelling of the microemulsions with addition of RTILs.

Original languageEnglish (US)
Pages (from-to)74604-74613
Number of pages10
JournalRSC Advances
Volume6
Issue number78
DOIs
StatePublished - 2016

Bibliographical note

Funding Information:
N. S. is grateful to SERB, Department of Science and Technology and Council of Scientic and Industrial Research (CSIR), Government of India for generous research grants. C. B. is thankful to UGC; N. K. and D. B. are thankful to IIT Kharagpur and A. R. is thankful to CSIR for the research fellowships

Publisher Copyright:
© The Royal Society of Chemistry 2016.

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