Hybrid Zwitterionic Hydrogels with Encoded Differential Swelling and Programmed Deformation for Small-Scale Robotics

Area of Science:

• Materials Science
• Robotics
• Biomedical Engineering

Background:

• Stimuli-responsive hydrogels are key for untethered small-scale soft robots.
• These robots offer potential for minimally invasive medical procedures, including cargo and cell transportation.
• Existing materials often lack the necessary self-healing and tunable properties for advanced robotic functions.

Purpose of the Study:

• To synthesize novel responsive hydrogels with self-healing capabilities.
• To engineer hybrid hydrogel constructs with programmable shape-morphing abilities.
• To demonstrate untethered soft robotic functionalities for biomedical applications.

Main Methods:

• Synthesis of zwitterionic/acrylate-based hydrogels exhibiting self-healing and stimuli-responsiveness.
• Fabrication of hybrid constructs by cutting and pasting hydrogels to achieve anisotropic properties.
• Programming 2D-to-3D deformation via controlled changes in environmental ionic strength.

Main Results:

• Successfully synthesized self-healing, stimuli-responsive hydrogels.
• Created hybrid constructs capable of programmed shape-morphing (2D-to-3D deformation).
• Demonstrated untethered soft robotic functionalities including actuation, magnetic locomotion, and cargo transport in aqueous media.

Conclusions:

• The developed hydrogels provide a versatile platform for fabricating advanced small-scale soft robots.
• This approach enables the creation of robots with tunable properties for specific biomedical tasks.
• The research expands the range of functional materials available for soft robotics.