Increasing the Dimensionality of Soft Microstructures through Injection-Induced Self-Folding.

Area of Science:

• Soft matter science
• Microfabrication technologies
• Robotics and microfluidics

Background:

• Soft materials are crucial for advanced devices in microfluidics and robotics.
• Device functionality depends heavily on material properties and fabrication methods.
• Existing techniques often limit the creation of complex 3D soft structures.

Purpose of the Study:

• To introduce a new paradigm for fabricating 3D soft microstructures and devices.
• To utilize phase-changing materials for transforming 2D laminates into 3D structures.
• To demonstrate a novel fabrication approach through the creation of a complex microfluidic device.

Main Methods:

• Integration of multilayer soft lithography, precision laser micromachining, and folding.
• Application of phase-changing materials to enable structural transformation.
• Design and manufacturing of a "microfluidic origami" device.

Main Results:

• Successful creation of 3D soft microstructures and devices.
• Demonstration of 2D to 3D transformation using phase-changing actuators.
• Fabrication of a 12-layer soft robotic peacock spider with embedded microfluidic circuitry.

Conclusions:

• The combined fabrication approach establishes a new paradigm for 3D soft microdevice creation.
• Phase-changing materials offer a versatile route to reconfigurable soft structures.
• The developed "microfluidic origami" technique enables complex, functional soft robotic devices.