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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles
Published on: March 13, 2017
A sweat-pH-enabled strongly adhesive hydrogel for self-powered e-skin applications
Lei Zhang1,2, Siheng Wang1, Zhuomin Wang1
1Institute of Chemical Industry of Forestry Products, Key Laboratory of Biomass Energy and Material, Jiangsu Province, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Chinese Academy of Forestry, Nanjing 210042, China. liuhe.caf@gmail.com.
This study developed a tough, adhesive hydrogel electrode from cellulose and acrylic acid that maintains strong skin adhesion even when sweaty. This innovation improves the collection of electrophysiological signals during exercise for better health monitoring.
Area of Science:
- Materials Science
- Biomedical Engineering
- Polymer Chemistry
Background:
- On-skin hydrogel electrodes face adhesion challenges due to sweat, limiting their practical use.
- Existing hydrogel electrodes often detach in humid or sweaty conditions, compromising signal quality.
Purpose of the Study:
- To engineer a robust, skin-adhesive hydrogel electrode with enhanced performance in sweaty environments.
- To investigate the self-adaptive adhesion mechanism of the hydrogel in response to pH changes caused by sweat.
Main Methods:
- Fabrication of a cellulose-nanofibril/poly(acrylic acid) (CNF/PAA) hydrogel utilizing hydrogen-bond networks.
- Investigating the hydrogel's adhesive properties and mechanical strength at different pH levels, simulating sweaty conditions.
- Evaluating the hydrogel electrode's performance in collecting electrophysiological signals from sweaty skin during exercise.
Main Results:
- The CNF/PAA hydrogel demonstrated significantly improved interfacial toughness, shear strength, and tensile strength at lower pH (pH 4.5) compared to neutral pH (pH 7.5).
- The hydrogel electrode maintained conformability and reliable electrophysiological signal collection on sweaty skin during exercise, showing high signal-to-noise ratios.
- Sweat-induced pH drop was shown to modulate the hydrogel's protonation and active group release, enhancing its adhesive properties.
Conclusions:
- The developed tough adhesive hydrogel electrode offers a promising solution for reliable electrophysiological signal recording under real-life, sweaty conditions.
- This strategy advances the design of high-performance hydrogels for continuous monitoring in intelligent systems.
- The pH-responsive adhesion mechanism provides a new avenue for developing advanced wearable electronic devices.
