Hydrophobically Associated Hydrogel for High Sensitivity and Resolution of an Interdigital Electrode Pressure Sensor

IF 5.5 2区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Xuan Cao , Qinglong Cao , Taoyi Zhang , Wenxi Ji , Usman Muhammad , Jing Chen , Yun Wei
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Abstract

Hydrogel-based flexible strain sensors have been known for their excellent ability to convert different motions of humans into electrical signals, thus enabling real-time monitoring of various human health parameters. In this work, a composite hydrogel with hydrophobic association and hybrid cross-linking was fabricated by using polyacrylamide (PAm), surfactant sodium dodecyl sulfate (SDS), lauryl methacrylate (LMA), and polypyrrole (PPy). The dynamic dissociation-conjugation among LMA, SDS, and PPy could dissipate energy to improve the toughness of hydrogels. The SDS/PPy/LMPAm composite hydrogel with a toughness of 1.44 MJ/m3, tensile fracture stress of 345 kPa, tensile strain of 1021%, and electrical conductivity of 0.57 S/m was obtained. Furthermore, an interdigital electrode flexible pressure sensor was designed to replace the bipolar electrode flexible pressure sensor, which greatly improved the sensitivity and resolution of the pressure sensor. The SDS/PPy/LMPAm composite hydrogel-based interdigital electrode flexible pressure sensor showed extraordinary stability and identified different hand gestures as well as monitored the pulse signal of humans. Moreover, the characteristic systolic and diastolic peaks were clearly observed. The pulse frequency (65 times/min) and the radial artery augmentation index (0.57) were calculated, which are very important in evaluating the arterial vessel wall and function of human arteries.

Abstract Image

Abstract Image

亲水性水凝胶可实现数字间电极压力传感器的高灵敏度和高分辨率
基于水凝胶的柔性应变传感器因其能够将人体的不同运动转化为电信号,从而实现对各种人体健康参数的实时监测而闻名。在这项研究中,利用聚丙烯酰胺(PAm)、表面活性剂十二烷基硫酸钠(SDS)、甲基丙烯酸月桂酯(LMA)和聚吡咯(PPy)制成了一种具有疏水联合和混合交联的复合水凝胶。LMA、SDS 和 PPy 之间的动态解离-共轭可以耗散能量,从而提高水凝胶的韧性。结果表明,SDS/PPy/LMPAm 复合水凝胶的韧性为 1.44 MJ/m3,拉伸断裂应力为 345 kPa,拉伸应变为 1021%,导电率为 0.57 S/m。此外,还设计了一种数字间电极柔性压力传感器来取代双极电极柔性压力传感器,从而大大提高了压力传感器的灵敏度和分辨率。基于 SDS/PPy/LMPAm 复合水凝胶的指间电极柔性压力传感器表现出了超强的稳定性,不仅能识别不同的手势,还能监测人体的脉搏信号。此外,还能清晰地观察到特征性的收缩和舒张峰值。计算出的脉搏频率(65 次/分钟)和桡动脉增强指数(0.57)对评估人体动脉血管壁和功能非常重要。
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来源期刊
Biomacromolecules
Biomacromolecules 化学-高分子科学
CiteScore
10.60
自引率
4.80%
发文量
417
审稿时长
1.6 months
期刊介绍: Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.
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