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  • Title: Wearable strain sensors based on casein-driven tough, adhesive and anti-freezing hydrogels for monitoring human-motion.
    Author: Guan L, Yan S, Liu X, Li X, Gao G.
    Journal: J Mater Chem B; 2019 Sep 14; 7(34):5230-5236. PubMed ID: 31378805.
    Abstract:
    Flexible hydrogel-based sensors have attracted significant attention due to promising applications of wearable devices. However, fabricating a flexible hydrogel combining toughness, stickiness, anti-freezing capability and conductivity is still a great challenge. Here, casein and LiCl are successfully introduced into a polyacrylamide hydrogel to prepare a tough and adhesive PAAm/casein hydrogel, which exhibits good mechanical properties and excellent reversible adhesive behavior for diverse materials and human skin. Due to the presence of conductive ions, the PAAm/casein hydrogel exhibits high conductivity (0.0753 S cm-1) and anti-freezing properties (-21 °C). Moreover, the PAAm/casein hydrogel as a flexible wearable strain sensor is sensitive to both large-scale human motions (e.g., joint bending) and tiny physiological signals (e.g., speaking). It is envisioned that the strategy would provide novel inspiration for the development of flexible wearable protein-driven hydrogel devices.
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