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Microfluidic ultralow interfacial tensiometry with magnetic particles.

Scott S H Tsai¹, Jason S Wexler, Jiandi Wan

¹School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

|November 17, 2012

Summary

This study introduces a novel microfluidic technique using paramagnetic spheres to measure ultralow interfacial tensions. The method accurately quantifies interfacial tension in the range of 10(-6) to 10(-5) N m(-1).

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Area of Science:

Fluid Dynamics
Surface Science
Microfluidics

Background:

Accurate measurement of ultralow interfacial tension is crucial for various scientific and industrial applications.
Existing methods for measuring low interfacial tensions can be complex or limited in sensitivity.
Microfluidic devices offer precise control over fluid interfaces and particle behavior.

Purpose of the Study:

To develop and validate a novel microfluidic technique for measuring ultralow interfacial tensions.
To demonstrate the efficacy of using paramagnetic spheres and magnetic fields for interfacial tension quantification.
To provide a sensitive and accessible method for interfacial tension measurements in the range of 10(-6) to 10(-5) N m(-1).

Main Methods:

Utilizing a co-flow microfluidic device integrated with a magnetic section.
Employing paramagnetic spheres whose behavior near the liquid-liquid interface is controlled by a tunable magnetic field.
Observing sphere-interface interactions (passing through or being trapped) to determine threshold magnetic field strengths.
Correlating magnetic field parameters with interfacial tension values.

Main Results:

The technique successfully measures ultralow interfacial tensions in the range of O(10(-6)-10(-5)) N m(-1).
Measurements were validated using solutions with varying surfactant concentrations.
Results obtained using this method show good agreement with those from a spinning drop tensiometer.

Conclusions:

The described microfluidic technique offers a sensitive and effective approach for measuring ultralow interfacial tensions.
This method provides a valuable tool for research and applications requiring precise quantification of interfacial properties.
The technique demonstrates potential for widespread adoption due to its simplicity and accuracy.