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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...

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A Piezoionic Hydrogel-Based Electrochemical Strain Sensor for Self-Powered Pulse Monitoring and Machine

Feng Li1, Weigong Huang1, Sijie Xie1

  • 1National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Guangdong Key Laboratory of Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen University, Shenzhen 518060, China.

ACS Sensors
|March 9, 2026
PubMed
Summary

This study introduces an ultrasensitive hydrogel strain sensor utilizing a piezoionic mechanism for enhanced wearable electronics. The sensor achieves high sensitivity and fast response for accurate dynamic strain detection in health monitoring and human-machine interfaces.

Keywords:
electrochemical strain sensormachine learningpiezoionic hydrogelpulse monitoringspeech recognition

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Wearable Electronics

Background:

  • Hydrogel strain sensors are crucial for wearable electronics due to their flexibility and biocompatibility.
  • Conventional sensors often lack sensitivity to small forces, limiting their application.

Purpose of the Study:

  • To develop an ultrasensitive hydrogel-based strain sensor using a piezoionic response.
  • To enhance sensitivity and performance for dynamic strain detection.

Main Methods:

  • Fabrication of a hydrogel with a Young's modulus of ~45 kPa.
  • Optimization of hydrogel water content to boost the piezoionic coefficient.
  • Electrochemical measurement of strain via the piezoionic effect.

Main Results:

  • Achieved a 741% enhancement in piezoionic coefficient with increased water content.
  • Demonstrated a high gauge factor of 1242 and fast response/decay times (40 ms/90 ms).
  • Successfully captured detailed pulse waveforms and achieved 96.3% accuracy in speech recognition.

Conclusions:

  • The developed hydrogel sensor offers ultrasensitive dynamic strain detection.
  • It shows significant potential for advanced health monitoring and human-machine interfaces.
  • The piezoionic mechanism provides a novel strategy for high-performance strain sensing.