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Real-Time Visualization of Interfacial Electric Field Dynamics in Microdroplets
Xinyuan Cao1,2, Si-Yu Yang1,2, Qi-Bing Xiao1
1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Journal of the American Chemical Society
|December 15, 2025
Summary
Researchers developed a new fluorescence imaging method to observe electric fields at microdroplet interfaces during coalescence. This technique reveals how these fields change in real-time, offering insights into interfacial dynamics.
Area of Science:
- Physical Chemistry
- Interface Science
- Microfluidics
Background:
- Understanding electric field dynamics at microdroplet interfaces is crucial for interfacial reactivity.
- Current methods lack the temporal resolution to capture rapid interfacial fluctuations.
Purpose of the Study:
- To introduce a novel fluorescence kinetic imaging technique for real-time visualization of electric fields during microdroplet coalescence.
- To quantitatively map the spatiotemporal evolution of interfacial electric fields.
Main Methods:
- Utilized a field-sensitive fluorescent probe to monitor electric fields.
- Calibrated probe fluorescence decay with applied field strength.
- Employed fluorescence kinetic imaging to observe microdroplet coalescence.
Main Results:
- Successfully visualized spatiotemporal evolution of electric fields during microdroplet fusion.
- Demonstrated strong correlation between interfacial electric fields and droplet morphology.
- Observed rapid disappearance of fields upon boundary disruption.
- Showed external modulation of electric fields using molecular additives like ethanol.
Conclusions:
- Established a broadly applicable method for probing interfacial phenomena in microdroplets.
- Provided fundamental insights into electric field dynamics at air-water interfaces.
- Highlighted potential for advancing microdroplet technologies in catalysis and materials science.
