Constructing 3D heterogeneous hydrogels from electrically manipulated prepolymer droplets and crosslinked microgels

Area of Science:

• Biomaterials Engineering
• Microfluidics
• Materials Science

Background:

• Hierarchical 3D hydrogel architectures are crucial for mimicking biological structures and designing novel materials.
• Current methods for creating these architectures often involve separate, complex formation and assembly steps for microgels.
• This complexity limits the diversity and scalability of hydrogel material fabrication.

Purpose of the Study:

• To develop a programmable method for constructing complex hydrogel architectures.
• To integrate microgel formation and assembly into a single, streamlined process.
• To demonstrate the versatility of the platform for diverse hydrogel materials and scales.

Main Methods:

• Utilized an electromicrofluidic platform employing electrowetting and dielectrophoresis.
• Manipulated prepolymer droplets, crosslinked microgels, particles, and molecules in multiple phases.
• Controlled microgel properties (conductive/dielectric, photocrosslinkable, chemically crosslinkable, thermally crosslinkable) via electrical addressing.

Main Results:

• Achieved programmable formation and assembly of hydrogel building blocks (microgels).
• Successfully constructed heterogeneous and seamless 3D hydrogel architectures.
• Demonstrated manipulation across a wide range of scales, from micrometers to millimeters.

Conclusions:

• The electromicrofluidic platform offers a unified approach to hydrogel architecture fabrication.
• This technique simplifies the manufacturing of complex, multifunctional hydrogels.
• The platform is expected to become a general method for creating diverse 3D hydrogel structures.