Reusable Liquid Metal-Based Hierarchical Hydrogels with Multifunctional Sensing Capability for Electrophysiology...

Area of Science:

• Biomedical Engineering
• Materials Science
• Wearable Technology

Background:

• Traditional Ag/AgCl gels for electrophysiological monitoring suffer from skin interface interference during physical activity, leading to unstable signal collection.
• This instability hinders reliable health monitoring and rehabilitation assessments, particularly during movement.

Purpose of the Study:

• To develop a novel electrode material that overcomes the limitations of current Ag/AgCl gels for stable electrophysiological signal acquisition.
• To create a hydrogel-based electrode with enhanced adhesion, self-healing, stretchability, and conductivity for real-time physiological monitoring.

Main Methods:

• Design and synthesis of a liquid metal-based hierarchical hydrogel with tailored rheological and adhesive properties.
• Fabrication of electrode patches using the developed hydrogel for electrophysiological signal collection.
• Assembly of a strain sensor using the conductive hydrogel for monitoring limb movements and gesture recognition.

Main Results:

• The liquid metal-based hydrogel demonstrated excellent adhesion, self-healing, stretchability, and conductivity.
• A conformal electrode/skin interface was achieved, enabling stable electrophysiological signal acquisition during exercise.
• The hydrogel-based strain sensor effectively monitored human limb movements and facilitated remote intelligent gesture recognition.

Conclusions:

• The developed liquid metal-based hierarchical hydrogel offers a promising solution for stable electrophysiological signal acquisition during physical activities.
• This technology provides a foundation for next-generation intelligent hydrogels for personal health surveillance, rehabilitation monitoring, and wearable human-machine interaction.