Hydrogel-based microactuators with remote-controlled locomotion and fast Pb2+-response for micromanipulation

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Lead(II) ions (Pb(2+)) pose significant environmental and health risks.
• Effective micromanipulation tools are needed for targeted remediation in microenvironments.
• Existing microactuators lack integrated remote control and specific ion responsiveness.

Purpose of the Study:

• To develop novel hydrogel-based microactuators for remote-controlled locomotion.
• To achieve fast lead(II) ion (Pb(2+)) response for micromanipulation tasks.
• To demonstrate the application of these microactuators in preventing Pb(2+)-leakage.

Main Methods:

• Fabrication of quadruple-component double emulsions to create microactuators.
• Incorporation of Pb(2+)-responsive poly(N-isopropylacrylamide-co-benzo-18-crown-6-acrylamide) microgels.
• Integration of an eccentric magnetic core for magnetic manipulation and a hollow cavity for ion response.

Main Results:

• Successfully fabricated hydrogel microactuators with remote magnetic control.
• Demonstrated rapid volume swelling in response to Pb(2+) ions.
• Utilized microactuators to effectively clog a microchannel and prevent Pb(2+)-leakage.

Conclusions:

• The developed microactuators offer a novel solution for micromanipulation in Pb(2+)-polluted microenvironments.
• This technology presents a potential model for multifunctional actuators, sensors, and soft microrobots.
• The findings open avenues for applications in micro-electro-mechanical systems and drug delivery.