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Related Experiment Video

Updated: Aug 30, 2025

Shape Memory Polymers for Active Cell Culture
10:53

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Ionic shape memory polymer gels as multifunctional sensors.

YingJun An1, Haruki Yoshida1, Yuxin Jing1

  • 1Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-4-37 Takeda, Kofu, 400-8510, Japan. okuzaki@yamanashi.ac.jp.

Soft Matter
|August 30, 2022
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Summary

Novel ionic shape memory polymer gels were developed using ionic liquids. These gels exhibit shape memory properties and function as self-powered sensors for motion detection in IoT applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape memory polymers (SMPs) are advanced materials capable of recovering their original shape after deformation.
  • Ionic liquids (ILs) offer unique properties like conductivity and thermal stability, making them suitable for functional material design.
  • Integrating ILs into SMPs can lead to multifunctional materials with enhanced properties.

Purpose of the Study:

  • To fabricate novel ionic shape memory polymer (SMP) gels incorporating ionic liquids (ILs).
  • To investigate the shape memory effect and sensor capabilities of these ionic SMP gels.
  • To demonstrate the potential of these materials in wearable self-powered sensors for Internet of Things (IoT) applications.

Main Methods:

  • Fabrication of ionic SMP gels using SMPs and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) at varying weight ratios.
  • Thermomecanical analysis to evaluate shape memory properties (shape fixing and recovery ratios).
  • Mechanoelectrical analysis to assess sensor performance under bending, using PEDOT:PSS electrodes.

Main Results:

  • The ionic SMP gel with 25 wt% IL (W_IL = 25 wt%) demonstrated significant shape memory behavior, achieving shape fixing and recovery ratios of 72.7% and 72.9%, respectively.
  • Ionic SMP gel sensors generated an open circuit voltage of 3.3 mV and a charge of 1.6 nC upon bending.
  • Sensor output (voltage and charge) showed a linear increase with bending displacement and velocity, respectively.

Conclusions:

  • Ionic SMP gels exhibit promising shape memory effects and self-powered sensing capabilities.
  • The developed materials are suitable for creating multifunctional wearable sensors for IoT devices.
  • This research opens avenues for advanced smart materials in wearable electronics and sensing.