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Related Experiment Video

Updated: Aug 9, 2025

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs

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Published on: July 27, 2022

Is there a difference between surfactant-stabilised and Pickering emulsions?

Riande I Dekker^1,2, Santiago F Velandia^1,3, Heleen V M Kibbelaar¹

¹van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands. r.i.dekker@uva.nl.

|February 22, 2023

Summary

This summary is machine-generated.

Distinguishing between surfactant-stabilised and Pickering emulsions is challenging, as both particle and surfactant systems significantly lower interfacial tension. Particle-based emulsions also show reduced stability compared to surfactant-stabilised ones.

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Area of Science:

Colloid and Surface Science
Materials Science
Physical Chemistry

Background:

Surfactants reduce interfacial tension (IFT) by adsorbing at interfaces.
Pickering emulsions are stabilized by solid particles, traditionally assumed to have minimal impact on IFT.

Purpose of the Study:

To investigate measurable physical properties that distinguish surfactant-stabilised from Pickering emulsions.
To compare the interfacial behavior of particle-stabilised systems with traditional surfactant systems.

Main Methods:

Interfacial tension (IFT) measurements were performed on soybean oil/water with ethyl cellulose nanoparticles (ECNPs), silicone oil/water with bovine serum albumin (BSA), and sodium dodecyl sulfate (SDS) solutions/air.
Analysis using the Gibbs adsorption isotherm and Langmuir equation of state.
Dynamic interfacial tension measurements to assess equilibrium and adsorption timescales.
Coalescence stability tests for particle-based vs. surfactant-stabilised emulsions.

Main Results:

All systems (ECNPs, BSA, SDS) showed significant IFT decrease with increasing concentration.
Particle-based systems exhibited high adsorption densities, similar to surfactants.
Adsorption energy for particles was found to be a few kBT.
Characteristic adsorption timescales were longer for particles than surfactants.
Particle-based emulsions were less stable against coalescence than surfactant-stabilised emulsions.

Conclusions:

Measurable physical properties do not clearly distinguish surfactant-stabilised from Pickering emulsions.
Both particle and surfactant systems effectively lower interfacial tension.
Differences in adsorption timescales and emulsion stability were observed, but not sufficient for clear distinction.