Quantification of the Effect of an Impurity Addition on the Interaction Between Unlike Molecules in Mixed Liquids: A Theoretical Study

• Published in: Journal of solution chemistry 2014-08, Vol.43 (8), p.1414-1420
• Main Authors: Guettari, Moez, Ajroudi, Lilia, Jouini, Karima, Tajouri, Tahar, Herráez, José V.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Constants; Deviation; Electrolytes; Geochemistry; Impurities; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Liquids; Nonelectrolytes; Oceanography; Physical Chemistry; Ternary systems; Viscosity
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-014-0216-x

The aim of this work is to develop a simple theory to study the effect of the addition of an impurity on the interaction between unlike molecules in mixed liquids. For the viscosity of a binary liquid mixture, the interaction between unlike molecules is quantified by the Grunberg–Nissan constant d ′ . When an impurity is added, the ternary system can be considered as quasi-binary. Thus, the interaction between unlike molecules in the presence of an impurity is quantified by a pseudo Grunberg–Nissan constant d p ′ . Several other quantities are introduced to describe the effect of an impurity addition: the deviation of the Grunberg–Nissan constant, δ d ′ = d p ′ - d ′ , and the relative deviation of the Grunberg–Nissan constant δ d ′ δ d ′ d ′ d ′ A critical concentration, c c , is also introduced, above which the impurity presence affects the interaction between unlike molecules in mixed liquids. The developed approach was applied for specific impurities: neutral polymer, nonelectrolyte, and electrolyte. Thus, the introduced quantities are connected to the impurity characteristics in each liquid and their mixture.