Inertial flow focusing: a case study in optimizing cellular trajectory through a microfluidic MEMS device for...

Area of Science:

• Biotechnology
• Microfluidics
• Cell Mechanics

Background:

• Microfluidic systems, including micro-electromechanical systems (MEMS), are valuable for studying mechanical force effects on cells.
• High-throughput analysis in microfluidics is limited by the need to optimize fluid and particle flow conditions.
• While flow velocity and particle size are understood, temperature and buffer viscosity effects remain less explored.

Purpose of the Study:

• To investigate the impact of temperature and buffer viscosity on the performance of a microfluidic cell-impact device, the μHammer.
• To establish a framework for optimizing microfluidic device performance by analyzing particle dynamics.

Main Methods:

• Tracking polystyrene bead velocity through the μHammer device.
• Visualizing bead impact to assess device timing.
• Analyzing the influence of temperature and buffer viscosity on particle trajectories.

Main Results:

• Device timing is sensitive to the ratio of inertial to viscous forces experienced by particles.
• Changes in temperature and viscosity significantly affect particle trajectories and impact timing.
• An effective throughput exceeding 360 beads/s was achieved.

Conclusions:

• The study provides a robust framework for optimizing microfluidic device performance by adjusting temperature and viscosity.
• This optimization framework enhances consistency in microfluidic systems dependent on precise particle manipulation.
• The findings facilitate improved high-throughput cell analysis using microfluidic technologies.