Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Conductometric and Fluorimetric Investigations on the Properties of Mixed Micelles of Two Cationic Gemini Surfactants

Akram, M.[Mohd.], Azum, N.[Naved], Naqvi, A. Z.[Andleeb Z.], Kabir-ud-Din
J. Chem. Eng. Data 2010, 55, 11, 4746-4751
ABSTRACT
The mixed micellar properties of two cationic gemini surfactants, alkanediyl-a,w-bis(tetradecyldimethylammonium bromide) and alkanediyl-a,?-bis(hexadecyldimethylammonium bromide), 14-s-14 and 16-s-16, in aqueous solution have been investigated by conductivity and fluorescence techniques. The conductivity method has been carried out to evaluate critical micelle concentration (c), degree of counterion binding (g), and other related parameters like ideal mixed critical micelle concentration (c*), micellar mole fraction (x), interaction parameter (ss) from Rubingh s model, and xideal from Motomura s model. Activity coefficients (f1 and f2) and Gibbs excess energy (GE) were also calculated. Fluorescence measurements were used to obtain the values of Nagg and Stern-Volmer constant (Ksv). The results suggest synergism in the system. The ss values are negative, and their magnitudes increase with increasing spacer chain lengths. x1 greater than x1ideal values suggest that the contribution of the 14-s-14 component is greater as compared to that in the ideal state.
Compounds
# Formula Name
1 H2O water
2 C36H78Br2N2 N1,N1,N4,N4-tetramethyl-N1,N4-ditetradecylbutane-1,4-diaminium bromide
3 C40H86Br2N2 N1,N4-dihexadecyl-N1,N1,N4,N4-tetramethylbutane-1,4-diaminium bromide
4 C37H80Br2N2 N1,N1,N5,N5-tetramethyl-N1,N5-ditetradecylpentane-1,5-diaminium bromide
5 C41H88Br2N2 N1,N5-dihexadecyl-N1,N1,N5,N5-tetramethylpentane-1,5-diaminium bromide
6 C38H82Br2N2 N,N,N',N'-tetramethyl-N,N'-ditetradecylhexane-1,6-diaminium bromide
7 C42H90Br2N2 N1,N6-dihexadecyl-N1,N1,N6,N6-tetramethylhexane-1,6-diaminium bromide
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
  • 3
  • 2
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 2; Liquid
  • Amount concentration (molarity), mol/dm3 - 3; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ELICO conductivity bridge, model CM82T
  • 80
  • POMD
  • 1
  • 5
  • 4
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 4; Liquid
  • Amount concentration (molarity), mol/dm3 - 5; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ELICO conductivity bridge, model CM82T
  • 80
  • POMD
  • 1
  • 7
  • 6
  • Electrical conductivity, S/m ; Liquid
  • Amount concentration (molarity), mol/dm3 - 6; Liquid
  • Amount concentration (molarity), mol/dm3 - 7; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ELICO conductivity bridge, model CM82T
  • 80