High-k Dielectric Passivation: Novel Considerations Enabling Cell Specific Lysis Induced by Electric Fields

Area of Science:

• Biophysics
• Electrical Engineering
• Cell Biology

Background:

• Understanding cell electrodynamics is crucial for advancing cell manipulation, diagnostics, and treatments.
• Existing electrode designs face limitations in controlling electric field effects due to electrochemical reactions.

Purpose of the Study:

• To introduce a novel electrode design for enhanced control over cell electrodynamic behavior.
• To demonstrate cell-size specific lysis using this new electrode design in a microfluidic system.

Main Methods:

• Development of an electrode design utilizing metal oxide high-k dielectric passivation.
• Implementation of a microfluidic flow-through system for cell exposure to electric fields.
• Characterization of lysis efficiency and bacterial viability post-exposure.

Main Results:

• Achieved 99.8% blood cell lysis within 6 seconds of exposure.
• Demonstrated preservation of viability for both Gram-positive and Gram-negative bacterial spike-ins.
• The dielectric passivation layer effectively couples electric fields to cells while preventing ohmic decoupling from the electrolyte.

Conclusions:

• The novel electrode design offers improved control and adjustability of electric field effects on cells.
• This technology supports next-generation investigations in biological electrodynamics.
• Potential applications span medicine, life sciences, and industry for cell manipulation and diagnostics.