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

Dynamic Interfacial Tension between Water and n-Octane plus Sorbitan Monolaurate at (274.2 to 293.2) K

Peng, B.-Z.[Bao-Zi], Chen, G.-J.[Guang-Jin], Sun, C.-Y.[Chang-Yu], Liu, B.[Bei], Zhang, Y.-Q.[Yan-Qin], Zhang, Q.[Qian]
J. Chem. Eng. Data 2011, 56, 4, 1617-1621
ABSTRACT
The equilibrium and dynamic interfacial tension of water/n-octane plus sorbitan monolaurate (the commercial name of Span 20) were measured using the pendant drop technique at four temperatures, (274.2, 278.2, 282.2, and 293.2) K. The concentration range of Span 20 is from (0.014 to 1.41) g*kg-1. The experimental results showed that Span 20 has excellent interface activity and a pronounced dynamic effect on the water/n-octane interface. The critical micelle concentration of Span 20 at different temperatures was determined, and it shifts toward lower value with the increase of temperature. The dynamic interfacial tension data show that, at the beginning of the adsorption process, it was only diffusion-controlled. At the near-equilibrium stage, there exists an adsorption barrier due to the strong molecular interaction of Span 20.
Compounds
# Formula Name
1 H2O water
2 C8H18 octane
3 C18H34O6 sorbitan laurate
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
  • 2
  • 1
  • Interfacial tension, N/m ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid - 1
  • Drop weight
  • 4
  • POMD
  • 2
  • 3
  • 1
  • Interfacial tension, N/m ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid - 1
  • Drop weight
  • 60