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Fine-Core Highly Water-Retentive Hydrogel Flexible Optical Fiber for Long-Term Stable Sensing Application.

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Summary

This study introduces high-water-retention hydrogel flexible optical fibers (HFOFs) with enhanced stability for sensing applications. These novel HFOFs exhibit superior water retention and mechanical properties, enabling reliable environmental and biomedical monitoring.

Keywords:
fine-core fiberflexible sensinghigh water retentionhydrogel optical fiberlong-term stability

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Optoelectronics

Background:

  • Hydrogel flexible optical fibers (HFOFs) show promise for environmental and biomedical sensing.
  • Current HFOFs suffer from poor water retention and environmental tolerance due to free water and low crosslinking density, limiting their use as stable sensing waveguides.

Purpose of the Study:

  • To develop a novel high-water-retention, fine-core HFOF with improved stability and performance.
  • To address the limitations of existing HFOFs for reliable sensing applications.

Main Methods:

  • HFOFs were fabricated using a polyacrylamide hydrogel with glycerol via drawing spinning.
  • Fiber network porosity was reduced, and hydrogen bonds were generated through self-assembly induced by water evaporation during drawing and stretching.
  • Glycerol's hydroxyl groups formed hydrogen bonds with water, creating bound water and enhancing water retention.

Main Results:

  • The developed HFOF exhibited excellent water retention (<0.1%/day water loss), high stretching performance (500%), good light-guiding ability (1.45 dB/cm), and rapid recovery (1 min).
  • The HFOFs were successfully applied in bionic sensors for vibration detection and flexible sensors for monitoring human respiration and heartbeat.

Conclusions:

  • This work presents a new solution for enhancing the stability and usability of HFOFs.
  • The developed HFOFs offer new possibilities for bionic monitoring and wearable human sensors.