Viscometric Study of Ionic Interactions of Fe2+ Ions in Water and Aqueous Sunflower Oil Emulsions at Different Temperatures

• Published in: Russian Journal of Physical Chemistry A 2022-12, Vol.96 (12), p.2650-2658
• Main Authors: Nadeem, Syed Muhammad Saqib, Saeed, Rehana, Anbreen, Farhana
• Format: Article
• Language: English
• Subjects: Chemical Kinetics and Catalysis; Chemistry; Chemistry and Materials Science; Correlation coefficients; Emulsions; Evaluation; Ferrous ions; Ionic interactions; Parameters; Physical Chemistry; Sunflower oil; Temperature dependence; Viscosity
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024422120275

The viscosity and density of water and aqueous sunflower oil emulsions containing different concentrations of Fe 2+ ions were measured at temperatures of 303.15, 308.15, 313.15, 318.15, and 323.15 K. The viscosity increased with an increase in the concentration of Fe 2+ ions and sunflower oil in the emulsion while it decreased with the increase in temperature. The ionic interactions were evaluated from the straight-line plots of the Jones–Dole equation; η sp /√ C = A + B √ C . The ion-ion interaction varied inconsistently while the ion-solvent interaction decreased with the increase in temperature. A negative d B /d T confirmed the structure-making behavior of Fe 2+ ions in water and aqueous sunflower oil emulsions. The plots of the Moulik equation were linear with good correlation coefficients and the fluidity parameters were found dependent on the temperature. The activation energy ( E a ) and other kinetic parameters were also evaluated to provide supportive evidence.