Formulation of pyridinium based RTIL-in-cyclohexane microemulsions: Investigations on size, conductivity and molecular interactions

B. Bharatiya*, P. A. Hassan, N. V. Sastry

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)

Abstract

Room-temperature ionic liquids (RTILs) based on alkyl pyridinium (py) and alkyl picolinium (pic) based structure are synthesized in combination with tetrafluoroborate (BF4 -) anion [CnH2n + 1py/pic][BF4], and further dispersed in cyclohexane using Triton X-100 (nonionic surfactant) as the emulsifier. The phase boundaries of the ternary system RTIL/TX-100/cyclohexane are investigated and microstructures in different regions of the phase diagram are identified by electrical conductivity measurements. At the onset corresponding to formation of RTIL-in-cyclohexane microemulsions, the required weight fraction of cyclohexane is higher for octyl substituted cations compared to their butyl counterpart. The electrical conductivity of the formed microemulsion increases gradually with a corresponding increase in temperature. Microemulsion of RTILs bearing butyl chain showed higher electrical conductivity compared to octyl substituted structures. The size and size distribution of the droplets in microemulsion were measured by dynamic light scattering (DLS), which revealed gradual increase in the droplet size with a corresponding increase in the RTIL/TX-100 mole ratio (R). The FTIR measurements confirmed strong H-bond formation between the pyridine hydrogen and oxyethylene (OE) groups in TX-100, which provides structural stability to the formed microemulsion.

Original languageEnglish
Pages (from-to)586-594
Number of pages9
JournalJournal of Molecular Liquids
Volume218
Early online date11 Mar 2016
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • DLS
  • Hydrogen bonding
  • Microemulsion
  • Percolation
  • RTIL

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