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Electro-Viscoelastic Migration under Simultaneously Applied Microfluidic Pressure-Driven Flow and Electric Field.

Murat Serhatlioglu¹, Ziya Isiksacan¹, Melis Özkan¹

¹UNAM - National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey.

Analytical Chemistry

|April 17, 2020

Summary

This summary is machine-generated.

This study explains particle migration in microfluidic channels using Electro-Viscoelastic Migration (EVM) theory. It reveals how fluid properties influence particle focusing, with potential applications in microfluidic technology.

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Area of Science:

Microfluidics
Fluid Dynamics
Polymer Science

Background:

Particle migration in microfluidic channels is complex, with existing studies lacking a full explanation of equilibrium states.
Current understanding is limited to Newtonian and neutral viscoelastic fluids, leaving gaps in explaining particle behavior in diverse media.

Purpose of the Study:

To comprehensively investigate particle migration dynamics under combined pressure-driven flow and DC electric fields.
To elucidate the interplay of electrophoretic, slip-induced, elastic, and shear gradient lift forces.
To develop a unifying theory for particle migration in both Newtonian and viscoelastic fluids.

Main Methods:

Experimental studies on particle migration in Newtonian, neutral viscoelastic, and polyelectrolyte viscoelastic media.
Development and application of the Electro-Viscoelastic Migration (EVM) theory.
Confocal imaging of fluorescent-labeled polymer solutions to visualize migration behavior.

Main Results:

Experimental results with viscoelastic media contradicted existing explanations for particle migration.
The Electro-Viscoelastic Migration (EVM) theory provides a unifying explanation for particle migration in various fluid types.
Observed cross-sectionally nonuniform viscoelasticity in microfluidic channels.

Conclusions:

The EVM theory successfully explains particle migration in microfluidic systems with Newtonian and viscoelastic fluids.
The discovery of nonuniform viscoelasticity opens new avenues for microfluidic particle focusing applications.
This research advances the understanding of particle dynamics in complex fluids within microchannels.