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Tissue-Adaptable Hydrogel for Mechanically Compliant Bioelectronic Interfaces.

Xinyu Qu1,2, Qian Wang2, Dingli Gan2

  • 1School of Physics and Key Laboratory of Quantum Materials and Devices of Ministry of Education, Southeast University, Nanjing 211189, China.

Nano Letters
|March 13, 2025
PubMed
Summary

This study introduces a novel shape-adaptive, electroactive hydrogel for bioelectronics. This biocompatible material offers tissue-like properties, enabling seamless integration for improved bioelectrical transduction and communication.

Keywords:
BioelectrodesBioelectronic interfacesConductive hydrogelMechanical compliance.

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Area of Science:

  • Biomaterials Science
  • Bioelectronics
  • Tissue Engineering

Background:

  • Hydrogels are crucial for bioelectronics due to their biocompatibility and softness.
  • A need exists for conformal hydrogel biointerfaces to connect electronic devices with irregular tissue surfaces.
  • Developing materials with tissue-adapted conductivity is essential for effective bioelectrical transduction.

Purpose of the Study:

  • To develop a shape-adaptive, electroactive hydrogel with tissue-adapted conductivity for bioelectronic applications.
  • To investigate the role of molecular-level modifications in enhancing hydrogel properties.
  • To create a dynamic, compliant bioelectronic interface for improved tissue integration and function.

Main Methods:

  • Precisely regulating molecular chains and polymer networks of multisource gelatin.
  • Utilizing ion interactions between gelatin and sodium citrate to form electrostatic domains.
  • Employing a reversible fluid-gel transition for *in situ* hydrogel formation and tissue integration.

Main Results:

  • A shape-adaptive electroactive hydrogel with tissue-adapted conductivity (≈1.03 S/m) was successfully synthesized.
  • Local amine-carboxylate electrostatic domains enhanced physiological adaptability and regulated biodegradation.
  • The hydrogel demonstrated *in situ* gelatinization, forming a dynamic, compliant interface via chemical bonding and topological effects.
  • The hydrogel's mechanical-electrical coupling facilitated bioelectrical conduction reconstruction and electrical stimulation therapy.

Conclusions:

  • The developed hydrogel offers a promising solution for conformal bioelectronic interfaces.
  • Its tunable properties and *in situ* adaptability enhance integration with biological tissues.
  • The material holds potential for applications in tissue regeneration and sensory restoration through bioelectrical modulation.