The solubility parameterδ is a thermodynamic quantity introduced by Hildebrand and Scatchard (HS) to describe the behavior of the so-called regular solutions. Such solutions have a negligible mixing volume and excess entropy of mixing, so that the excess Gibbs free energy coincides with the mixing enthalpy. The HS model uses the idea of cohesive energy density (CED), that is, the difference between the internal energy of the system and that of the corresponding system in the ideal gas state, per volume of liquid substance, estimated as follows: (Sandler 2006)
And the solubility parameter δ is defined as:
The solubility parameter is related to the molar excess Gibbs free energy, \( {\tilde{G}}^{EX} \), and to the mixing enthalpy, \( \Delta {\tilde{H}}_{MIX} \), by the following expression valid for a binary mixture:
where:
And for the activity coefficient of species i:
The model is predictive for the solubility as far as the δvalues...
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Sandler SI (2006) Chemical, biochemical and engineering thermodynamics, 4th edn. Wiley, New York
van Krevelen DW (1990) Properties of polymers: their correlation with chemical structure; their numerical estimation and prediction from additive group contributions, 3rd edn. Amsterdam, Elsevier
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 Springer-Verlag Berlin Heidelberg
About this entry
Cite this entry
De Angelis, M.G. (2016). Solubility Parameter. In: Drioli, E., Giorno, L. (eds) Encyclopedia of Membranes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44324-8_1264
Download citation
DOI: https://doi.org/10.1007/978-3-662-44324-8_1264
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-662-44323-1
Online ISBN: 978-3-662-44324-8
eBook Packages: Chemistry and Materials ScienceReference Module Physical and Materials ScienceReference Module Chemistry, Materials and Physics