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Adsorption and Aggregation Properties of Some Polysorbates at Different Temperatures
Katarzyna Szymczyk1, Anna Zdziennicka1, Bronisław Jańczuk1
1Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.
Journal of Solution Chemistry
|December 8, 2018
Summary
This study quantifies the surface tension of polysorbate solutions (Tween 20, 60, 80) and determines critical micelle concentrations. Thermodynamic functions of adsorption and micellization were calculated, revealing insights into Tween molecule behavior at interfaces.
Area of Science:
- Physical Chemistry
- Surface Science
- Colloid Chemistry
Background:
- Polysorbates (Tween 20, 60, 80) are non-ionic surfactants widely used in various industries.
- Understanding their behavior at the water-air interface is crucial for formulation development and predicting performance.
Purpose of the Study:
- To measure surface tension of aqueous polysorbate solutions at different temperatures.
- To determine key thermodynamic parameters like Gibbs surface excess, critical micelle concentration, and standard Gibbs energy of adsorption.
- To elucidate the molecular interactions and packing at the water-air interface.
Main Methods:
- Surface tension measurements at 293, 303, and 313 K.
- Application of the Gibbs adsorption equation and Joos equation.
- Calculation of molecular cross-sections and areas based on molecular structure.
- Utilizing the Langmuir equation for adsorption thermodynamics.
Main Results:
- Determined Gibbs surface excess concentration and critical micelle concentrations for Tweens.
- Calculated the limiting area occupied by Tween molecules at the interface.
- Derived standard Gibbs energy of adsorption, enthalpy, and entropy values.
- Investigated thermodynamic functions of micellization and compared them to intermolecular interactions.
Conclusions:
- The study provides a comprehensive thermodynamic characterization of polysorbates at the water-air interface.
- Established a link between molecular structure, interfacial behavior, and thermodynamic properties.
- Offers valuable data for optimizing formulations involving Tween surfactants.
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