Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat capacity and phase behavior of aqueous diethylene glycol npentyl ether by DSC

Piekarski, H.[Henryk], Tkaczyk, M.[Mariola], Tyczynska, M.[Magdalena]
Thermochim. Acta 2012, 550, 19-26
ABSTRACT
The specific heat capacities of aqueous solutions of diethylene glycol n-pentyl ether (C5E2) with molalities m2 . 1.8232 mol kg-1 were measured within the temperature range (273.15 - 338.15) K by DSC. Changes in the specific, apparent and partial molar heat capacities of the aqueous system investigated were analyzed and considered as an effect of structural transformations in order to determine the boundary between the region, within which the molecules of amphiphile occur in the form of monomers, and the area, in which the first large aggregates or micelles appear. For each solution, the temperature dependence of differential heat flow was analyzed in order to determine the temperature of phase transition and the boundary between mono- and diphase systems.
Compounds
# Formula Name
1 C9H20O3 diethylene glycol monopentyl ether
2 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
  • 2
  • 1
  • Lower consolute temperature, K ; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • VISOBS
  • 1
  • POMD
  • 2
  • 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Phase equilibration
  • 18
  • POMD
  • 2
  • 1
  • Lower consolute composition: mass fraction - 1 ; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • VISOBS
  • 1
  • POMD
  • 2
  • 1
  • Molar heat capacity at constant pressure, J/K/mol ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Small sample (50 mg) DSC
  • 297