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Lignin-reinforced eutectogel with environmentally stability for high-performance human multi-functional sensor.

Deyan Du1, Tatsuo Kaneko1, Weifu Dong1

  • 1The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi 214122, PR China.

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Summary

This study introduces a durable, moisture-tolerant bio-based eutectogel (BEG) for flexible sensors. The new material demonstrates stable performance in sensing temperature and strain, offering potential for long-term human healthcare monitoring.

Keywords:
ElectrocardiographyEnvironmental stabilityEutectogelLigninStrain sensorsTemperature sensors

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Hydrogels often lack environmental stability, limiting their use in durable flexible sensors.
  • Developing robust materials is crucial for reliable human physiological monitoring.

Purpose of the Study:

  • To design and fabricate an environmentally tolerant bio-based eutectogel (BEG).
  • To evaluate the BEG's potential as a stable dual sensor for temperature and strain in healthcare applications.

Main Methods:

  • Fabrication of BEG using deep eutectic solvent (DES), thioctic acid (TA), and lignin via cast-drying.
  • Utilizing in-situ infrared spectroscopy to study dynamic interactions during fabrication.
  • Assessing mechanical properties, moisture tolerance, and sensing performance (temperature-strain).

Main Results:

  • The BEG exhibits enhanced mechanical properties and moisture tolerance due to lignin-induced hydrophobic layer formation.
  • The material demonstrates high sensitivity and rapid response for dual temperature-strain sensing (GF = 1.17, TCR = 4.26 %/K, response time = 373 ms).
  • Biocompatible BEG successfully recorded human physiological signals long-term, comparable to commercial electrodes.

Conclusions:

  • The developed BEG offers environmental stability and robust performance for flexible sensors.
  • This bio-based material presents a promising strategy for durable, stretchable eutectogels in human healthcare monitoring.