Bioinspired Self-Growing Hydrogels by Harnessing Interfacial Polymerization

Area of Science:

• Materials Science
• Polymer Chemistry
• Robotics

Background:

• Natural materials exhibit self-growing properties, adapting to their environment through bottom-up fabrication.
• Synthetic materials lack the inherent self-growing capabilities of natural counterparts, posing a challenge for advanced applications.
• Replicating natural self-growth in synthetic systems is crucial for developing adaptive and responsive materials.

Purpose of the Study:

• To fabricate synthetic hydrogels with self-growing characteristics.
• To mimic the self-assembly and growth mechanisms observed in natural biological materials.
• To explore the potential of these self-growing hydrogels in soft robotics and actuation.

Main Methods:

• Utilized free radical polymerization at the interface between acrylamide (AAm) precursor solution and eutectic gallium-indium (EGaIn) liquid metal.
• Leveraged the liquid metal interface to initiate and sustain hydrogel growth.
• Observed the upward self-propagation of the hydrogel as it formed.

Main Results:

• Successfully fabricated self-growing polyacrylamide (PAAm) hydrogels.
• Demonstrated that the hydrogel growth is driven by polymerization at the liquid metal interface.
• Achieved autonomous upward growth of the synthetic hydrogel material.

Conclusions:

• Developed a novel method for creating self-growing synthetic hydrogels.
• The liquid metal-polymerization interface provides a unique platform for autonomous material fabrication.
• These self-growing hydrogels hold significant promise for applications in soft robotics and actuation systems.