Microrail-assisted liposome trapping and aligning in microfluidic channels.

Area of Science:

• Biophysics
• Materials Science
• Microfluidics

Background:

• Liposome assemblies are valuable cell tissue models for studying intercellular communication.
• Microfluidic channels enable liposome manipulation, but trapping and aligning multiple liposomes remains challenging due to their fragility.

Purpose of the Study:

• To investigate a microrail-assisted technique for manipulating water-in-oil emulsions and liposomes.
• To demonstrate the construction of specifically shaped liposome assemblies for cell interaction studies.

Main Methods:

• Numerical simulations were used to analyze drag forces on liposomes within microrail channels.
• A microrail device was designed and fabricated based on simulation results.
• Liposomes were trapped and aligned under microrails, and devices with various microrail shapes (y-shaped, ring-shaped) were created.

Main Results:

• Simulations confirmed drag forces direct liposomes into microrails.
• The device successfully trapped and aligned 24.7 ± 8.5 liposomes per hour.
• Microrail channels remained filled with liposomes for up to 3 hours.
• Various liposome assembly shapes, including non-straight configurations, were successfully constructed.

Conclusions:

• The microrail-assisted technique offers a robust method for manipulating liposomes.
• This technique enables the creation of diverse liposome assemblies, crucial for building cell-cell interaction models.
• Microrail channels represent a powerful tool for advancing liposome-based research in cell biology and tissue engineering.