Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

The critical phenomena of (water + AOT + decane) microemulsion with the molar ratio (x = 30.0) of water to AOT

Cai, H.[Honglan], An, X.[Xueqin], Shen, W.[Weiguo]
J. Chem. Thermodyn. 2007, 39, 11, 1470-1473
ABSTRACT
The coexistence curves of a ternary microemulsion system of {water + sodium di(2-ethylhexyl) sulfosuccinate (AOT) + n-decane} with the molar ratio (30.0) of water to AOT have been determined by measurements of refractive index at constant pressure within about 8 K from the critical temperature Tc. The critical exponent b and the critical amplitude B have been deduced from the coexistence curves. The experimental results have been analysed and compared with the system with molar ratio of 40.8 studied previously. It was found that the critical exponents b for both systems were consistent with the 3D-Ising value in a region sufficiently close to the critical temperature. The critical concentration was slightly affected by the molar ratio x, but the critical temperature significantly was raised as the molar ratio x was decreased. The volume fraction / was the better choice of the concentration variable than the effective volume fraction w and the refractive index n used for constructing the order parameter for both systems.
Compounds
# Formula Name
1 H2O water
2 C20H37NaO7S sodium bis(2-ethylhexyl) sulfosuccinate
3 C10H22 decane
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
  • 3
  • 2
  • 1
  • Upper consolute temperature, K ; Liquid mixture 1
  • Solvent: Amount ratio of component to other component of binary solvent - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • VISOBS
  • 1
  • POMD
  • 3
  • 2
  • 1
  • Refractive index (other wavelength) ; Liquid
  • Volume fraction - 3; Liquid
  • Temperature, K; Liquid
  • Solvent: Amount ratio of component to other component of binary solvent - 1; Liquid
  • Pressure, kPa; Liquid
  • Wavelength, nm; Liquid
  • Liquid
  • method of minimum deviation
  • 64