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Reconciling Granular Hydrogel Microstructure and Mechanics via a Temporary Thermo-Responsive and Cell-Invadable
Jun Kim1, Soyeon Kwon1, Taimoor H Qazi1
1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|August 6, 2026
Summary
Thermo-Responsive Granular Hydrogels (TRGHs) overcome mechanical limitations by using a temporary matrix to increase void volume and mechanical integrity. This innovation enhances 3D printing and cell invasion for advanced biomaterials.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Granular hydrogels offer tunable microporous structures but face a trade-off between void volume and mechanical strength.
- Increasing interparticle spacing to enhance void volume typically weakens mechanical properties and causes unjamming.
Purpose of the Study:
- To develop Thermo-Responsive Granular Hydrogels (TRGHs) that decouple interparticle spacing from mechanical integrity.
- To create advanced biomaterials with adjustable void volume and preserved mechanical properties for biofabrication and tissue repair.
Main Methods:
- Incorporation of a temporary thermo-responsive and cell-invadable interstitial matrix.
- Processing TRGHs at 5°C to adjust spacing and then increasing temperature to 37°C to solidify the matrix.
- Characterization of mechanical properties (storage modulus), interstitial space, extrudability, and in vitro/in vivo cell invasion.
Main Results:
- Achieved over 150% increase in interstitial space.
- Enhanced storage modulus by 4 orders of magnitude (5 to 8900 Pa) through temperature-triggered processing.
- Demonstrated improved 3D printability, structural integrity, and supported enhanced cell migration and in vivo tissue/vessel invasion.
Conclusions:
- TRGHs successfully address the mechanical limitations of traditional granular hydrogels by utilizing a dynamic interstitial matrix.
- These advanced biomaterials offer broader design possibilities for applications in biofabrication, disease modeling, and regenerative medicine.
- The developed TRGHs show significant potential for improving in vitro and in vivo biological interactions.
