Joule heating effects in optimized insulator-based dielectrophoretic devices: An interplay between post geometry and...

Area of Science:

• Electrokinetics
• Microfluidics
• Biophysics

Background:

• Insulator-based dielectrophoresis (iDEP) utilizes non-uniform electric fields generated by insulating structures for particle manipulation.
• High voltages required in iDEP systems can lead to detrimental Joule heating, especially for biological samples.
• Understanding and mitigating temperature increases is crucial for optimizing iDEP applications.

Purpose of the Study:

• To experimentally and computationally investigate temperature variations within iDEP devices.
• To evaluate the impact of different channel designs, specifically post array characteristics, on temperature rise.
• To establish a correlation between channel geometry, electric resistance, and heat generation.

Main Methods:

• Experimental measurements using a custom-built copper Resistance Temperature Detector.
• Computational modeling using a 3D COMSOL model to simulate heat generation and dissipation.
• Systematic variation of iDEP channel designs, focusing on post shape, size, and spacing.

Main Results:

• A temperature difference of approximately 4°C was observed between different iDEP device designs.
• The 3D COMSOL model showed good agreement with experimental temperature measurements.
• The study found that the electric resistance of the post array significantly influences the average temperature within the iDEP channel.

Conclusions:

• Channel design, particularly the characteristics of insulating posts, plays a critical role in managing temperature rise in iDEP devices.
• Computational modeling is a valuable tool for predicting and understanding thermal effects in iDEP systems.
• Optimizing channel geometry can help mitigate detrimental Joule heating, enhancing the suitability of iDEP for sensitive applications.