Programming the Shape Transformation of a Composite Hydrogel Sheet via Erasable and Rewritable Nanoparticle Patterns

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Environmentally adaptive hydrogels are of significant interest.
• Controlling hydrogel shape transformation is crucial for advanced applications.

Purpose of the Study:

• To develop a robust strategy for reprogramming light-induced shape transformations in thermoresponsive hydrogels.
• To demonstrate erasable and rewritable patterning of photothermal agents for shape control.

Main Methods:

• Utilized a thermoresponsive composite hydrogel sheet.
• Incorporated erasable and rewritable patterns of iron oxide nanoparticles as photothermal agents.
• Investigated light-induced shape transformations and verified them using finite element modeling.

Main Results:

• Achieved numerous distinct and reversible shape transformations from a single hydrogel sheet.
• Demonstrated repeatable reprogramming of nanoparticle patterns for diverse shape changes.
• Verified the shape transformations through finite element modeling.

Conclusions:

• The presented strategy offers a simple, fast, and efficient method for reprogramming hydrogel shape change.
• The composite hydrogel sheet has potential applications in soft robotics, tissue engineering, and controlled release.