Highly Stretchable Eutectogel for Strain Sensors and Bioelectrodes Under Extreme Environments.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Flexible sensors require materials with enhanced stability, adhesion, mechanical strength, self-healing, and transparency.
• Eutectogels offer potential due to their tunable properties and dynamic networks.

Purpose of the Study:

• To develop a multifunctional eutectogel with superior properties for flexible sensing applications.
• To investigate the potential of a novel deep eutectic solvent (DES)-based gel for electrocardiogram (ECG) monitoring.

Main Methods:

• Synthesized a eutectogel by combining a DES (acrylic acid and guanidine hydrochloride) with catechol and mesoporous molecular sieves.
• Characterized the gel's mechanical properties (stretchability, compressive strength, adhesion), transparency, UV-blocking, moisture retention, and environmental stability.
• Evaluated the eutectogel's performance as a bioelectrode for electrocardiogram detection.

Main Results:

• The eutectogel exhibited exceptional stretchability (1680.4%), compressive strength (760.9 kPa), fatigue resistance, and adhesion strength (35.8 kPa).
• Achieved high transparency (92.41%), UV-blocking, excellent moisture retention (≈2% weight change after 6 days), and wide environmental stability (-70-50 °C).
• Demonstrated successful application as an ECG bioelectrode capable of monitoring heart rate under extreme conditions.

Conclusions:

• The developed eutectogel possesses a unique combination of properties suitable for advanced flexible sensing.
• Its robust performance and stability make it a promising material for wearable bioelectronics and cardiovascular disease monitoring.