Electro-Magnetic Synergy Driven Pump with Liquid Metal for Rapid Liquid Transport

Area of Science:

• Microfluidics
• Materials Science
• Robotics

Background:

• High-speed fluid transport is crucial for biomedicine, chemical analysis, and soft robotics.
• Conventional pumps are bulky, power-hungry, noisy, and heavy.
• Existing liquid metal (LM)-based micropumps face clogging issues, limiting performance.

Purpose of the Study:

• To develop a clogging-free, efficient, and portable fluid transport system.
• To synergize electric and magnetic fields for enhanced liquid metal manipulation.
• To demonstrate versatile applications of the new pump technology.

Main Methods:

• Integration of core-shell Fe@PDA@Ag magnetic particles into liquid metal to create magnetically responsive LM droplets (MLM).
• Utilizing a magnetic LM-based electro-magnetic fluid pump (mEMFP) design that anchors MLM within the pump chamber.
• Operating the mEMFP with reduced frequency and increased duty cycle.

Main Results:

• The mEMFP design eliminates chamber clogging, allowing operation at 10 Hz and 80% duty cycle.
• A single MLM droplet achieved a flow rate of 1.59 × 10^4 μL min^-1.
• Four serially integrated MLMs delivered 2.20 × 10^4 μL min^-1 with <20 mW power consumption.
• Successful demonstrations in multifunctional liquid transport, phase-change valving, and thermal management.

Conclusions:

• The mEMFP offers a clogging-free solution for efficient microfluidic liquid transport.
• This technology enables high flow rates at significantly reduced power consumption.
• The mEMFP presents a viable pathway for advanced, high-performance microfluidic systems.