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A Hydration Shell‐Based Thermodynamic Model for Aqueous Two‐Phase Systems
Author(s) -
De Alcântara Pedro,
Filho Pessôa,
Mohamed Rahoma S.
Publication year - 2004
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450820314
Subject(s) - solvation shell , aqueous solution , solvation , molecule , ethylene glycol , polymer , thermodynamics , chemistry , phase (matter) , shell (structure) , work (physics) , materials science , organic chemistry , physics , composite material
In this work a Flory‐Huggins model modified to account for some unique features of Aqueous Two‐Phase Systems is presented. The model takes into account observed solvation between water and polymer molecules through the incorporation of a hydration shell to express the number of water molecules bonded to each polymer molecule. The parameters of the modified equation were determined using experimental data of ATPS containing poly (ethylene glycol) and dextran. The results revealed remarkable improvement in the correlation ability of the model. A general expression that defines the number of water molecules in the hydration shell was also obtained.