Simultaneous Pumping and Mixing of Biological Fluids in a Double-Array Electrothermal Microfluidic Device

Area of Science:

• Microfluidics
• Bioengineering
• Electrokinetics

Background:

• Efficient transport and mixing of biological fluids are crucial for lab-on-a-chip (LOC) devices.
• AC electrothermal (ACET) techniques are effective for high-conductivity biofluids like blood, saliva, and urine.

Purpose of the Study:

• To introduce and optimize a double-array ACET device for simultaneous fluid mixing and pumping.
• To investigate the impact of electrode configuration and angle on mixing and transport efficiency.

Main Methods:

• 2D and 3D simulations were employed to analyze fluid dynamics.
• Various electrode geometries and configurations were compared to identify optimal designs.
• The effect of electrode placement angle (30° ≤ θ ≤ 45°) on mixing and net flow was studied.

Main Results:

• An optimized asymmetrical electrode configuration reduced analyte transport time by 95% compared to diffusion-only transport.
• The proposed device achieved 80% improvement in transport time compared to conventional two-layer ACET devices.
• An angled asymmetrical electrode configuration significantly enhanced transversal mixing and longitudinal net flow.

Conclusions:

• The double-array ACET device offers superior performance for fluid manipulation in microfluidic channels.
• Optimized electrode design and placement are key to maximizing mixing and pumping efficiency.
• This technology holds significant promise for enhancing biosensor and immunoassay applications.