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High-Strength, Self-Healable, Temperature-Sensitive, MXene-Containing Composite Hydrogel as a Smart Compression

Yulin Zhang1, KaiXuan Chen1, Yueshan Li1

  • 1College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China.

ACS Applied Materials & Interfaces
|November 21, 2019
PubMed
Summary

This study introduces MXene-enhanced hydrogels with superior conductivity and mechanical strength for smart sensor applications. These advanced composite hydrogels offer excellent self-healing and stretchability, paving the way for practical use.

Keywords:
MXenecomposite hydrogelself-healingsmart sensorthermosensitive

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • MXene, a 2D material, shows promise in electrochemical applications due to its conductivity and mechanical properties.
  • Few-layer MXene exhibits good water dispersibility, making it suitable for hydrogel conductivity enhancement.
  • Research on MXene-based composite hydrogels for advanced applications is limited.

Purpose of the Study:

  • To synthesize MXene using a mild method.
  • To prepare composite hydrogels incorporating MXene and poly(N-isopropyl acrylamide) (PNIPAM) or physically cross-linked hydrogels.
  • To investigate the temperature sensitivity, stress-sensing properties, mechanical performance, and conductivity of the resulting composite hydrogels.

Main Methods:

  • MXene synthesis via a mild Yury method.
  • Preparation of composite hydrogels using PNIPAM or physically cross-linked hydrogels as matrices.
  • Characterization of mechanical properties (tensile strength, stretchability), self-healing ability, and electrical conductivity.

Main Results:

  • The composite hydrogels demonstrated exceptional mechanical properties, including >14x stretchability and 0.4 MPa tensile strength.
  • Good self-healing capabilities were observed in the MXene-enhanced hydrogels.
  • A significant increase in conductivity was achieved, reaching 1.092 S/m (15x higher than control hydrogels).

Conclusions:

  • The synthesized MXene-based composite hydrogels possess excellent mechanical and self-healing properties.
  • The enhanced conductivity makes these hydrogels suitable for smart compression sensor applications.
  • This work highlights the potential of MXene as a nanomaterial for advanced functional hydrogels.