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웨어러블 의료 기기용 3D 프린팅, 자가 접착 및 자가 힐링이 가능한 이온트로닉 하이드로젤 개발
김진서(Jinseo Kim),최건준(Geonjun Choi),김소미(Somi Kim),김재일(Jaeil Kim),정훈의(Hooneui Jeong) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Ionotronic hydrogels have attracted significant attention in emerging fields such as wearable devices, flexible electronics, and energy devices. To date, the design of multifunctional ionotronic hydrogels with strong interfacial adhesion, rapid self-healing, three-dimensional (3D) printing processability, and high conductivity are key requirements for future wearable devices. Herein, we report the rational design and facile synthesis of 3D printable, self-adhesive, self-healing, and conductive ionotronic hydrogels based on the synergistic dual reversible interactions of poly(vinyl alcohol), borax, pectin, and tannic acid. Multifunctional ionotronic hydrogels exhibit strong adhesion to various substrates with different roughness and chemical components, including porcine skin, glass, nitrile gloves, and plastics (normal adhesion strength of 55 ㎪ on the skin). In addition, the ionotronic hydrogels exhibit intrinsic ionic conductivity imparting strain -sensing properties with a gauge factor of 2.5 up to a wide detection range of approximately 2000%, as well as improved selfhealing behavior. Based on these multifunctional properties, we further demonstrate the use of ionotronic hydrogels in the 3D printing process for implementing complex patterns as wearable strain sensors for human motion detection. This study is expected to provide a new avenue for the design of multifunctional ionotronic hydrogels, enabling their potential applications in wearable healthcare devices.