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Diffusing Wave Spectroscopy Studies of Pickering Emulsion: Which Are the Tracer Particles?

Jianhui Wu^1,2, Hairui Li³, Tong Zhang⁴

¹College of Biomass Science and Engineering, Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China.

ACS Macro Letters

|December 19, 2025

Summary

Colloids, not droplets, are the tracer particles in Pickering emulsions, enabling accurate microrheology measurements using diffusing wave spectroscopy (DWS). This finding enhances DWS utility for characterizing these complex fluids.

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Area of Science:

Materials Science
Physical Chemistry
Soft Matter Physics

Background:

Accurate microrheology of Pickering emulsions is crucial but hindered by challenges in identifying tracer particles.
Diffusing wave spectroscopy (DWS) is a powerful technique for microrheology, but its application to Pickering emulsions requires precise tracer identification.

Purpose of the Study:

To identify the true tracer particles in Pickering emulsions (macroemulsions and microemulsions).
To validate the role of identified tracer particles in DWS measurements for microrheology.
To provide a strategy for accurate characterization of Pickering emulsion microrheology using DWS.

Main Methods:

Utilized diffusing wave spectroscopy (DWS) to analyze Pickering emulsions.
Employed computational simulations to compare the mobility of colloids and droplets.
Cross-validated DWS results with rotational rheometry measurements.

Main Results:

Demonstrated that colloidal particles, not emulsion droplets, act as tracers in Pickering emulsions.
Simulations showed colloids exhibit greater mobility, dominating the DWS signal decay.
Excellent agreement was found between rheometry and DWS-derived viscoelastic parameters when using the colloidal radius.

Conclusions:

Colloids are the dominant tracer particles in Pickering emulsions due to their smaller size and faster Brownian motion.
This identification strategy significantly enhances the reliability and accuracy of DWS for Pickering emulsion microrheology.
The findings offer a pathway to improved characterization of complex soft materials.