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Electrothermal flow effects in insulating (electrodeless) dielectrophoresis systems
Benjamin G Hawkins1, Brian J Kirby
1Department of Biomedical Engineering, College of Engineering, Cornell University, New York 14853, USA.
Electrophoresis
|November 16, 2010
Summary
Electrothermal effects enhance particle deflection and trapping in insulator-based dielectrophoresis (iDEP) systems. These phenomena are particularly significant in higher conductivity solutions and intermediate channel geometries.
Area of Science:
- Physics
- Fluid Dynamics
- Electrokinetics
Background:
- Insulator-based dielectrophoresis (iDEP) is a method for manipulating particles using non-uniform electric fields.
- Electrothermal (ET) effects, arising from the interplay of electric fields and fluid properties, can significantly influence microfluidic phenomena.
- Understanding these effects is crucial for optimizing iDEP device performance.
Purpose of the Study:
- To investigate the impact of electrothermal effects on particle deflection and trapping in iDEP systems.
- To identify key operating regimes where ET effects enhance iDEP performance.
- To analyze the influence of various parameters on temperature distribution and particle behavior.
Main Methods:
- Numerical simulations of fluid flow, heat transfer, and electromagnetic phenomena in a 2D iDEP system.
- Parametric studies involving electric field strength, channel geometry, fluid conductivity, and particle/channel mobilities.
- Quantification of particle deflection and trapping under varying conditions.
Main Results:
- ET effects were found to enhance particle deflection and trapping, particularly in higher conductivity solutions (σ m ≥ 1 × 10⁻³ S/m) and intermediate aspect ratios (2 ≤ r ≤ 7).
- Temperature distribution is strongly dependent on fluid conductivity and electric field magnitude.
- Increased particle electrophoretic (EP) mobility or channel electroosmotic (EO) mobility diminishes the impact of ET effects.
Conclusions:
- ET effects play a significant role in iDEP, altering particle behavior and enhancing deflection and trapping.
- The interplay between fluid, heat, and electromagnetic fields is critical in iDEP systems.
- Optimizing iDEP performance requires careful consideration of ET effects, especially in specific conductivity and geometry regimes.
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