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Establishing High-Performance Antifreezing Hydrogel Sensors via Synergistic Oligosaccharide-Ionic Networks
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DOI：10.1021/acs.chemmater.6c00933.png)
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Abstract
En 中文
Conductive hydrogels hold great potential in wearable electronics, human-computer interaction, and other fields due to their excellent stretchability, conductivity, and rapid responsiveness to external stimuli. However, a water content of over 80% severely limits the application of hydrogels in cold environments. To construct an antifreezing functional hydrogel, this work introduces hydroxyl-rich cello-oligosaccharides (COS) into polyacrylamide hydrogel systems. Due to their polyhydroxy structure and chain morphology, COS act as durable physical cross-linkers, forming an extensive hydrogen-bonding network with the polymer matrix and water molecules. The PAM-KCl2M-COS10% hydrogel exhibits a remarkably low freezing point of −29 °C and maintains exceptional mechanical performance (tensile strength was 0.75 MPa, elongation at break of 1280%) even at −20 °C. At the same time, KCl fully dissociates in the hydrogel, providing excellent ionic conductivity, the measured ionic conductivity reaches 8.47 S·m–1. A strain sensor made from this hydrogel achieves a wide sensing range from 10% to 1000% strain, with a gauge factor of 2.83. In addition, the hydrogel-based sensor retains 35% of its room-temperature electrical signal intensity at −20 °C, with a signal amplitude of around 165%. This work provides an effective solution to address the performance degradation of hydrogels in low-temperature environments.
Keywords:
Hydrogels
Peptides and proteins
Polyacrylamide
Sensors
Thermodynamic properties
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7
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2.8W
Citations:
11.4W
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