Tough, adhesive and biocompatibility protein-based hydrogel strain sensor for monitoring human-motion.
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초록
내용
Hydrogel is a three-dimensional polymer network structure composed of water and a polymer, and water is the major component of the hydrogel. However, high water contents of the hydrogel weaken the adhesion between hydrogel and skin, which is a bottle neck for wearable sensor application. Good adhesion between hydrogel and skin is essential for body sensitive sensor application. This study aims to fabricate a protein-based hydrogel using sodium caseinate (SC), a milk protein, for high adhesion, biocompatibility, high stretchability and good toughness. In the SC-AAm hydrogel, sodium caseinate micelles and acrylamide (AAm) chains impart mechanical toughness, and hydrogen bonds enable repeated adhesion to the skin. In addition, the introduction of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) imparts conductivity to the hydrogel, allowing it to act as a sensor capable of responding to various human movements such as fingers, knees, elbow bends, and deep breathing.