Ionic liquids as modulators of the critical micelle concentration of sodium dodecyl sulfate

  • Beyaz A
  • Oh W
  • Reddy V
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Critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS), an anionic surfactant, has been investigated in aqueous solutions of a variety of room temperature ionic liquids (RTILs): 1,3-dimethylimidazolium iodide (Me2IM-I, 2), 1-butyl-3-methylimidazolium chloride (BMIM-Cl, 3), 1-hexyl-3-methylimidazolium chloride (HxMIM-Cl, 4), 1-methyl-3-octylimidazolium chloride (MOIM-Cl), 5, and 1-methyl-3-octylimidazolium tetrafluoroborate (MOIM-BF4, 6). The CMC of SDS is shown to correlate with the nature of the alkyl groups in the RTILs; SDS showed appreciably higher CMCs in presence of ionic liquids 2 and 3, whereas in the presence of ionic liquids 4, 5, and 6 much smaller CMCs were observed. The nature of the gigenions, Cl-or BF4-, has no noticeable effect on the observed CMC values. © 2004 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • CMC
  • RTILs
  • SDS
  • Surfactants
  • UV-Vis spectroscopy

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  • Ayse Beyaz

  • Woon Su Oh

  • V. Prakash Reddy

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