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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Encapsulating eutectogels for stretchable humidity-resistant strain sensors.

Xiaodong Wan1,2,3, Yunfeng He1, Caicong Li1

  • 1Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China. wanxd@sustech.edu.cn.

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This study introduces a novel humidity-resistant eutectogel by coating it with a hydrophobic elastomer. This innovation enhances the stability and practical application of stretchable ionic conductors in wearable electronics.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Ionic Conductors

Background:

  • Eutectogels are advanced stretchable ionic conductors valued for their low cost, safety, and biocompatibility.
  • Their practical use is limited by susceptibility to humidity, affecting performance.
  • Developing humidity-resistant eutectogels is crucial for reliable applications.

Purpose of the Study:

  • To develop a humidity-resistant eutectogel with enhanced stability for practical applications.
  • To improve the performance of stretchable ionotronic devices under varying environmental conditions.
  • To demonstrate the potential of encapsulated eutectogels in wearable electronics.

Main Methods:

  • A dip-coating strategy was employed to create a P(MEA-co-IBA) elastomer-coated P(AAC-co-AAM) eutectogel.
  • The hydrophobic elastomer coating was designed to prevent water molecule exchange.
  • Characterization focused on assessing stretchability, conductivity, adhesion, and resistance to humidity.

Main Results:

  • The coated eutectogel exhibited suppressed water exchange while maintaining high stretchability (>500%) and conductivity.
  • Strong adhesion was achieved through an interpenetrating layer at the interface.
  • Encapsulated eutectogels demonstrated stable electrical performance (>1 h) and resistance to moisture.

Conclusions:

  • The hydrophobic elastomer coating effectively enhances the humidity resistance of eutectogels.
  • The developed eutectogels show promise for stable and reliable soft, wearable ionotronics.
  • This approach overcomes a key limitation, enabling broader practical applications.