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4D Biofabrication Using Shape-Morphing Hydrogels.

Alina Kirillova1, Ridge Maxson1, Georgi Stoychev1

  • 1College of Engineering, University of Georgia, Athens, GA, 30602, USA.

Advanced Materials (Deerfield Beach, Fla.)
|October 13, 2017
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Summary
This summary is machine-generated.

This study introduces an advanced 4D biofabrication method using shape-morphing hydrogels to create precise hollow tubes, overcoming key challenges in bioprinting small-diameter biological structures.

Keywords:
3D printing4D biofabricationbioprintinghydrogelsself-folding tubes

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Area of Science:

  • Biotechnology
  • Materials Science
  • Regenerative Medicine

Background:

  • 3D bioprinting shows promise for complex biological structures but struggles with fabricating hollow tubular designs.
  • Existing bioprinting methods face limitations in achieving high resolution and precise control over the diameters of tubular constructs.

Purpose of the Study:

  • To develop an advanced 4D biofabrication approach for creating hollow, self-folding tubes with high resolution and controlled diameters.
  • To demonstrate the versatility of this method using different biopolymers and cells for fabricating functional biological constructs.

Main Methods:

  • Utilized a 4D biofabrication strategy involving shape-morphing biopolymer hydrogels (alginate and hyaluronic acid).
  • Employed mouse bone marrow stromal cells within the hydrogel constructs.
  • Optimized printing and postprinting parameters to achieve precise control over tube architecture and diameter.

Main Results:

  • Successfully fabricated hollow self-folding tubes with unprecedented control over diameter and architecture.
  • Achieved average internal tube diameters as low as 20 µm, comparable to small blood vessels.
  • Demonstrated that the process maintains high cell viability, supporting cell survival for at least 7 days.

Conclusions:

  • The developed 4D biofabrication strategy enables the precise fabrication of hollow tubular structures, addressing a critical challenge in bioprinting.
  • This technique offers dynamically reconfigurable architectures with tunable functionality and responsiveness for various biofabrication applications.
  • The approach is versatile, supporting different biomaterials and cell types for advanced tissue engineering and regenerative medicine.