Magnetically driven rotary microfilter fabricated by two-photon polymerization for multimode filtering of particles

Area of Science:

• Microfluidics
• Materials Science
• Biotechnology

Background:

• Microfluidic devices are crucial for various applications, but efficient and versatile particle manipulation remains a challenge.
• Existing microfilters often lack reusability and dynamic control over filtration modes.

Purpose of the Study:

• To fabricate a magnetically driven rotary microfilter for microfluidic devices.
• To enable remote, on-demand switching between filtering and passing modes.
• To demonstrate multi-mode particle filtering and enhance microchip reusability.

Main Methods:

• Fabrication of a microfilter using two-photon polymerization with a femtosecond laser.
• Development of a magnetic photoresist and optimization of processing parameters.
• Remote manipulation of the microfilter using an external magnetic field for rotational control.

Main Results:

• Successful fabrication of a high-quality magnetically driven rotary microfilter.
• Demonstration of remote, angle-controlled rotation for switching between filtering and passing modes.
• Achieved selective particle capture (e.g., 8 µm particles) and passing (e.g., 2.5 µm particles), including multi-mode filtering.
• Enhanced microchip reusability due to the responsive nature of the microfilter.

Conclusions:

• The magnetically driven rotary microfilter offers a versatile and reusable solution for particle manipulation in microfluidic systems.
• Femtosecond laser two-photon polymerization provides a high-precision fabrication method for these advanced microfluidic devices.
• This technology holds significant potential for applications in chemical and biological research, enabling sophisticated lab-on-chip functionalities.