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Surface Specific Mixing Rule for Ionic Diffusion Coefficients at Infinite Dilution in Polymer/Water Mixtures
Author(s) -
Machefer S.,
Schnitzlein K.
Publication year - 2008
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200700493
Subject(s) - dilution , mixing (physics) , thermodynamics , diffusion , chemistry , ionic bonding , activity coefficient , polymer , van der waals force , viscosity , electrolyte , molecular diffusion , aqueous solution , molecule , ion , organic chemistry , physics , metric (unit) , operations management , electrode , quantum mechanics , economics
It has recently been shown that the viscosity of polymer/water mixtures can be accurately predicted with an ideal linear mixing rule based on molecular van der Waals surfaces. Because of the Stokes‐Einstein relation, a similar mixing rule may also be applicable to ionic diffusion coefficients at infinite dilution in polymer/water mixtures. This assumption is confirmed for the example system KDP/polyol/water at various temperatures. Moreover, the impact on electrolyte concentration is calculated and shows that the surface‐based mixing rule can also be used as a good approximation for the ionic diffusion coefficient for finite electrolyte concentrations.