Continuous-Flow Cell Dipping and Medium Exchange in a Microdevice using Dielectrophoresis.

Area of Science:

• Biotechnology
• Microfluidics
• Cell Biology

Background:

• Medium exchange is crucial for cell-based applications like washing and surface modification.
• Microfluidic platforms offer precise control over cellular environments.
• Existing methods for medium exchange can be complex or inefficient.

Purpose of the Study:

• To develop a simple microfluidic platform for continuous medium exchange and dipping of micro-objects.
• To utilize dielectrophoresis for precise manipulation of cells within microchannels.
• To optimize platform design through finite element analysis.

Main Methods:

• Fabrication of a microfluidic channel using polydimethylsiloxane (PDMS) bonded to a glass substrate.
• Integration of two arrays of microelectrodes for dielectrophoresis.
• Parametric studies using finite element analysis to optimize geometrical and operational parameters.
• Experimental validation using blood cell trajectories.

Main Results:

• Successful demonstration of continuous medium exchange and dipping of micro-objects.
• Optimized design parameters achieved through extensive simulations.
• Close agreement between numerical simulations and experimental results for cell trajectories.
• The platform enables precise control over micro-object manipulation.

Conclusions:

• The developed microfluidic platform effectively performs medium exchange and dipping using dielectrophoresis.
• The platform offers a simple, continuous, and controllable method for micro-object manipulation.
• This technology has potential applications in cell washing, surface modification, and controlled cell environment changes.