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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Electric fields enable tunable surfactant transport to microscale fluid interfaces.

Rajarshi Sengupta¹, Aditya S Khair¹, Lynn M Walker¹

¹Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

Physical Review. E

|October 3, 2019

Summary

Electric fields accelerate oil-soluble surfactant transport to oil-water interfaces. This surfactant delivery is controllable by adjusting electric field strength and timing, offering a new method for interface manipulation.

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Area of Science:

Physical Chemistry
Colloid and Surface Science
Microfluidics

Background:

Understanding surfactant behavior at fluid interfaces is crucial for various industrial applications.
Controlling the transport of surfactants to interfaces is a key challenge in microfluidic systems.

Purpose of the Study:

To quantify the transport dynamics of oil-soluble surfactants to oil-water interfaces.
To investigate the effect of electric fields on surfactant transport.
To demonstrate electric fields as a tunable parameter for manipulating surfactant delivery.

Main Methods:

Utilized a custom-built electrified capillary microtensiometer platform.
Performed dynamic interfacial tension measurements.
Applied direct current (DC) electric fields to the system.

Main Results:

Surfactant transport to the oil-water interface was significantly enhanced by the DC electric field.
Electro-migration of charge carriers within the oil phase was identified as the mechanism for enhancement.
The degree of enhancement was precisely tunable by altering electric field strength and temporal scheduling.

Conclusions:

Electric fields represent a novel and controllable method for manipulating surfactant transport to microscale fluid-fluid interfaces.
This technique offers potential for precise control over interfacial properties in microfluidic devices.
The findings open new avenues for utilizing electric fields in surfactant-based technologies.