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Updated: Jul 29, 2025
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An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components
Published on: July 18, 2018
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Control of Polymers' Amorphous-crystalline Transition for Hydrogel Bioelectronics Miniaturization and Multifunctional
Sizhe Huang1, Xinyue Liu2, Shaoting Lin3
1Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, United States.
Research Square
|May 22, 2023
Summary
We developed a new method to create tiny, adaptable hydrogel fibers for brain interfaces. This technique shrinks fibers by 80%, enabling detailed neural circuit studies and advanced bioelectronic device applications.
Area of Science:
- Bioelectronic devices
- Materials science
- Neuroscience
Background:
- Soft elastic bioelectronic devices are crucial for brain-machine interfaces and neural circuit investigation.
- Existing 2D microfabrication limits scalability for 3D bioelectronic architectures.
- Accessible and scalable manufacturing is needed for advanced neural applications.
Approach:
- Introduced a fabrication strategy: control of metamorphic polymers' amorphous-crystalline transition (COMPACT).
- Utilized cross-linkers, acidification, and deformation-induced crystalline growth for hydrogel fiber miniaturization.
- Achieved ~80% diameter reduction in polyvinyl alcohol (PVA) hydrogel fibers while maintaining hydration.
Key Points:
- COMPACT method precisely controls hydrogel properties like refractive index (1.37-1.40), light transmission (>96%), stretchability (95%-111%), and elastic modulus (10-63 MPa).
- Fabricated functional hydrogel optical probes for optogenetics and photometric recordings in mouse VTA.
- Developed CNTs-PVA hydrogel microelectrodes for simultaneous electromyographic and electrophysiological recordings.
Conclusions:
- The COMPACT strategy offers a scalable approach for miniaturized, multifunctional bioelectronic devices.
- Demonstrated in vivo application in mouse models for neural activity monitoring and behavioral assessment.
- Paves the way for integrated bioelectronic systems combining optical and electrical functionalities.
