Multi-responsive hydrogel structures from patterned droplet networks

Area of Science:

• Materials Science
• Soft Robotics
• Biomedical Engineering

Background:

• Responsive hydrogels are crucial for microscale devices but require advanced fabrication for complex structures.
• Current methods struggle to create heterogeneous, multi-material hydrogels needed for sophisticated applications.

Purpose of the Study:

• To develop a new fabrication technique for patterned, multi-material, and multi-responsive hydrogels.
• To enable the creation of complex hydrogel architectures for microscale applications.

Main Methods:

• Utilized nanolitre pre-gel droplets connected via lipid bilayers in specific architectures.
• Employed photopolymerization to form continuous hydrogel structures.
• Incorporated temperature-responsive, light-responsive (gold nanoparticles), and magnetic-responsive (magnetic particles) domains.

Main Results:

• Successfully fabricated patterned, multi-material hydrogels at micro- to millimetre scales.
• Demonstrated reversible curling via temperature-responsive domains.
• Achieved light-activated shape change using gold nanoparticles.
• Enabled magnetic-field-controlled movement and cargo manipulation.

Conclusions:

• The droplet network technology offers a versatile platform for fabricating complex, multi-responsive hydrogels.
• This method advances the development of sophisticated soft robotic and biomedical devices.
• The generated hydrogels exhibit tunable responses for diverse applications, including cargo transport.