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Microgel-Extracellular Matrix Composite Support for the Embedded 3D Printing of Human Neural Constructs
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Multiscale Engineered Heterogeneous Hydrogel Composites for Digital Light Processing 3D Printing.

Yuang Zhang1, Ryan Davis2, Saptarshi Biswas2

  • 1Department of Materials Science and Engineering, College of Engineering, Texas A&M University, College Station, Texas 77843, United States.

ACS Applied Materials & Interfaces
|September 8, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel bioink platform using microgels within a polymer matrix for digital light processing (DLP) 3D printing. This heterogeneous hydrogel composite offers tunable mechanical properties across multiple scales for advanced tissue engineering applications.

Keywords:
biomaterialsdigital light processing (DLP) 3D printinghydrogel compositemicrogelsregenerative medicine

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • 3D Bioprinting

Background:

  • Hydrogel bioinks are crucial for digital light processing (DLP) 3D printing, particularly in biomedical applications for tissue regeneration.
  • Current hydrogels have limited mechanical property tunability, restricting their use in mimicking complex tissue environments.
  • Existing methods for tuning hydrogel mechanics, such as cross-linking or packing density, offer insufficient control.

Purpose of the Study:

  • To develop a novel bioink platform with multiscale heterogeneity for DLP 3D printing.
  • To create mechanically tunable heterogeneous hydrogel composites by incorporating microgels into a polymer matrix.
  • To enable precise control over mechanical and biochemical properties at nano-, micro-, and macro-scales for advanced biomedical applications.

Main Methods:

  • Fabrication of monodisperse gelatin methacryloyl (GelMA) microgels using a high-throughput microfluidic device.
  • Tuning microgel stiffness via polymer concentration or cross-link density.
  • Embedding precross-linked microgels within a continuous GelMA matrix to form a heterogeneous hydrogel composite for DLP printing.

Main Results:

  • Achieved tunable composite compressive modulus ranging from 29 to 244 kPa by modulating microgel volume and printing parameters.
  • Demonstrated control over nano-, micro-, and macro-scale properties through chemical and physical tailoring of composite components.
  • Successfully fabricated complex 3D structures with macroscale heterogeneity using the developed bioink platform.

Conclusions:

  • The developed heterogeneous hydrogel composite platform offers a unique approach to designing tunable biomaterials for DLP 3D printing.
  • This modular platform enables the creation of complex 3D structures with properties mimicking native tissue and organ complexity.
  • The platform holds significant potential for advancing tissue regeneration and other biomedical applications requiring precise control over material properties.