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Electrostatically Reinforced Double Network Granular Hydrogels.

Tianyu Yuan1, Chenzhuo Li2, John M Kolinski2

  • 1Soft Materials Laboratory, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, 1015, Switzerland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 3, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed reinforced double network granular hydrogels (DNGHs) for 3D printing. These advanced soft materials mimic cartilage and muscle properties, enabling complex, load-bearing structures without support.

Keywords:
additive manufacturingfracture energygranular hydrogelinterfacial reinforcement

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Robotics

Background:

  • Soft robotics and biomedical applications require load-bearing soft materials for complex 3D shapes.
  • Direct ink writing (DIW) is a fabrication method for customizable shapes with varying compositions.
  • Granular hydrogels are suitable for DIW but often lack mechanical strength.

Purpose of the Study:

  • To develop strong, processable soft materials for advanced applications.
  • To enhance the mechanical properties of double network granular hydrogels (DNGHs).
  • To enable 3D printing of centimeter-scale free-standing structures with tunable properties.

Main Methods:

  • Formulating microgel-based hydrogels for DIW.
  • Reinforcing granular hydrogels with a second hydrogel to create DNGHs.
  • Electrostatically reinforcing DNGHs to improve fracture energy.
  • Developing an empirical model to predict fracture energy.

Main Results:

  • Electrostatically reinforced DNGHs exhibit mechanical properties comparable to cartilage and muscles.
  • The developed materials possess high Young's moduli and fracture energies.
  • A predictive model for fracture energy was established.
  • 3D printing of free-standing DNGH structures with tunable properties was achieved.

Conclusions:

  • Electrostatically reinforced DNGHs offer a promising solution for load-bearing soft materials.
  • These materials can be fabricated into complex, centimeter-scale structures via DIW.
  • The developed materials hold potential for advanced biomedical and soft robotics applications.