Dynamically crosslinked poly(vinyl alcohol)/borax strain sensors for organ motion monitoring

被引:3
作者
Nam, Ji Woo [1 ]
Moon, Chang-Hwan [2 ]
Kim, Dae-Hyun [2 ]
Kim, Min Hee [3 ]
Park, Won Ho [1 ]
机构
[1] Chungnam Natl Univ, Dept Organ Mat Engn, Daejeon 34134, South Korea
[2] Chungnam Natl Univ, Coll Vet Med, Dept Vet Surg, Daejeon 34134, South Korea
[3] Kyungpook Natl Univ, Dept Text Engn, Sangju 37224, South Korea
基金
新加坡国家研究基金会;
关键词
Poly(vinyl alcohol); Conductive hydrogel; Self-healing; Strain sensor; Human motion detection; Implantable heart monitoring; HYDROGEL;
D O I
10.1016/j.cej.2024.155748
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Wearable electronic sensing devices can detect various physiological responses and subtle changes in the skin in real time for the early detection and treatment of potential health problems or diseases. Among them, flexible hydrogel-based sensors are attracting much attention because they can monitor human movements and physiological signals. However, developing hydrogel-based sensors with rapid self-healing, self-adhesion, excellent conductivity and sensitivity characteristics remains a challenge. In this study, a hydrogel with a dynamic reversible network structure was developed using poly(vinyl alcohol) (PVA), hyaluronic acid (HA), borax, and tannic acid (TA). Multiple hydrogen bonds resulting from abundant hydroxyl groups in the hydrogel composed of borax, PVA, and TA improved the self-healing ability of the hydrogel, and the conductivity of this system (similar to 0.62 S/m) was improved upon immersion in NaCl. The optimum hydrogel exhibited excellent elasticity (similar to 941 %), biocompatibility, and demonstrated adhesion to porcine skin (dry: 5.3 kPa; wet: 2 kPa) without external stimulation in air and underwater environments. In addition, the fabricated hydrogels exhibited excellent sensitivity (similar to 300 % strain, gauge factor (GF) = 2.86; 300-900 % strain, GF = 4.95), allowing them to detect and distinguish various large and small human movements. Hydrogels that exhibited stable electrical signals even after 500 cycles were obtained, and the PBHT-N hydrogels were implanted into rabbit hearts to verify their applicability as strain sensors for effective real-time heart rate monitoring during rapid body movement.
引用
收藏
页数:10
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