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Tunable Electrokinetic Motion of Charged Nanoparticles in an Aqueous Solution Using Interdigitated Microelectrodes
Farshad Rezakhanloo1,2, Yera Ussembayev1,2, Mohammadreza Bahrami1,2
1LCP Research Group, Ghent University, Technologiepark 126, 9052 Gent, Belgium.
Nanomaterials (Basel, Switzerland)
|October 28, 2025
Summary
This study introduces a simple AC electric field method for precise nanoparticle separation, even with minor size differences. The technique offers tunable control for applications in cell manipulation and water purification.
Area of Science:
- Physics
- Chemistry
- Engineering
Background:
- Electrokinetic phenomena are valuable for micro/nanoparticle manipulation.
- Current methods often require complex setups and struggle with particles of similar properties.
Purpose of the Study:
- To develop a simple, tunable method for spatial control and separation of nanoparticles.
- To exploit subtle differences in electrokinetic responses for particle segregation.
Main Methods:
- Utilizing interdigitated electrodes under AC electric fields.
- Adjusting frequency and amplitude of applied voltage to control particle movement.
- Exploiting differences in electroosmotic and dielectrophoretic responses.
Main Results:
- Achieved precise spatial separation of micro- and nanoparticles of the same material.
- Demonstrated selective particle accumulation based on electrokinetic behavior.
- Showcased tunable control over particle positioning and segregation.
Conclusions:
- The presented technique offers a low-cost, integrable platform for nanoparticle manipulation.
- This method enables effective separation based on subtle electrokinetic differences.
- Potential applications include cell manipulation, water purification, and drug delivery.
