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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
Published on: August 30, 2019
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Surface Tension and Adsorption Studies by Drop Profile Analysis Tensiometry.
T Kairaliyeva1, E V Aksenenko2, N Mucic3
1Max-Planck-Institut für Kolloid-und Grenzflächenforschung, Potsdam, Germany.
Journal of Surfactants and Detergents
|December 5, 2017
Summary
Surfactant adsorption significantly impacts surface tension and dilational viscoelasticity measurements. A new algorithm accounts for this depletion effect, improving co-adsorption analysis and dynamic surface tension data interpretation.
Area of Science:
- Physical Chemistry
- Surface Science
- Colloid Science
Background:
- Surface tension and dilational viscoelasticity are crucial properties of surfactant solutions.
- Co-adsorption phenomena at interfaces influence these properties.
- Accurate measurement requires accounting for bulk depletion effects.
Purpose of the Study:
- To discuss surface tension and dilational viscoelasticity of surfactant solutions.
- To investigate co-adsorption of surfactants and alkanes.
- To propose an algorithm for the depletion effect in dynamic surface tension analysis.
Main Methods:
- Bubble and drop profile analysis tensiometry were employed.
- Experimental data from 12 surfactants with varying surface activities were analyzed.
- A novel algorithm was developed to quantify surfactant depletion.
Main Results:
- Surfactant depletion from the bulk can be significant, affecting co-adsorption.
- The proposed algorithm accurately describes alkane co-adsorption and dynamic surface tension.
- Dilational viscoelasticity measurements differ between bubble and drop methods at high surface pressures (>15 mN/m).
Conclusions:
- The depletion effect is critical for accurate interfacial studies.
- The developed algorithm enhances the understanding of co-adsorption mechanisms.
- Method-dependent differences in viscoelasticity measurements highlight the importance of surface pressure considerations.
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