Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Ionic liquids effect on critical micelle concentration of SDS: conductivity, fluorescence and NMR studies

Pal, A.[Amalendu], Chaudhary, S.[Sheena]
Fluid Phase Equilib. 2014, 372, 100-104
ABSTRACT
The effects of ionic liquids (ILs) 3-methyl-1-pentylimidazolium bromide, [C5mim][Br] and 1-heptyl-3-methylimidazolium bromide, [C7mim][Br] on the physicochemical properties of aqueous sodium dodecylsulfate (SDS) solutions were studied. Various micellar parameters such as critical micelle concentration (cmc), degree of counter ion dissociation, aggregation number as well as some thermodynamic parameters such as standard free energy of micellization, standard enthalpy of micellization and standard entropy of micellization have been evaluated. Significant increase in cmc and decrease in counter ion binding along with decrease in aggregation number was observed. 1H NMR technique was applied to reveal the solubilization site of ILs in the SDS micellar solutions.
Compounds
# Formula Name
1 C12H25NaO4S sodium dodecyl sulfate
2 C9H17BrN2 1-pentyl-3-methylimidazolium bromide
3 C11H21BrN2 1-heptyl-3-methylimidazolium bromide
4 H2O water
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • 4
  • 2
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Temperature, K; Liquid
  • Solvent: Mass fraction - 2; Liquid
  • Liquid
  • Crystal - 1
  • Direct current cell with electrodes
  • 7
  • POMD
  • 1
  • 4
  • 2
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Temperature, K; Liquid
  • Solvent: Mass fraction - 2; Liquid
  • Liquid
  • Crystal - 1
  • Direct current cell with electrodes
  • 25
  • POMD
  • 1
  • 4
  • 3
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Temperature, K; Liquid
  • Solvent: Mass fraction - 3; Liquid
  • Liquid
  • Crystal - 1
  • Direct current cell with electrodes
  • 12
  • POMD
  • 1
  • 4
  • 3
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 1; Liquid
  • Temperature, K; Liquid
  • Solvent: Mass fraction - 3; Liquid
  • Liquid
  • Crystal - 1
  • Direct current cell with electrodes
  • 20