A Non-Newtonian liquid metal enabled enhanced electrography

作者全名："Timosina, Veronika; Cole, Tim; Lu, Hongda; Shu, Jian; Zhou, Xiangbo; Zhang, Chengchen; Guo, Jinhong; Kavehei, Omid; Tang, Shi-Yang"

作者地址："[Timosina, Veronika; Cole, Tim; Tang, Shi-Yang] Univ Birmingham, Dept Elect Elect & Syst Engn, Birmingham B15 2TT, England; [Lu, Hongda] Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, Australia; [Shu, Jian; Zhou, Xiangbo] Univ Sci & Technol China, Dept Precis Machinery & Precis Instrumentat, CAS Key Lab Mech Behav & Design Mat, Hefei, Peoples R China; [Zhang, Chengchen] Univ New South Wales, Grad Sch Biomed Engn, Sydney, NSW 2052, Australia; [Guo, Jinhong] Chongqing Med Univ, Coll Lab Med, MOE Key Lab Lab Med Diagnost, 1 Yixueyuan Rd, Chongqing 400016, Peoples R China; [Kavehei, Omid] Univ Sydney, Fac Engn, Sch Biomed Engn, Sydney, NSW 2006, Australia; [Kavehei, Omid] Univ Sydney, Nano Inst, Sydney, NSW 2006, Australia"

通信作者："Tang, SY (通讯作者)，Univ Birmingham, Dept Elect Elect & Syst Engn, Birmingham B15 2TT, England.; Kavehei, O (通讯作者)，Univ Sydney, Fac Engn, Sch Biomed Engn, Sydney, NSW 2006, Australia."

来源：BIOSENSORS & BIOELECTRONICS

ESI学科分类：CHEMISTRY

WOS号：WOS:001009101900001

JCR分区：Q1

影响因子：10.7

年份：2023

卷号：235

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：　

摘要："Biopotential signals, like electrocardiography (ECG), electromyography (EMG), and electroencephalography (EEG), can help diagnose cardiological, musculoskeletal and neurological disorders. Dry silver/silver chloride (Ag/AgCl) electrodes are commonly used to obtain these signals. While a conductive hydrogel can be added to Ag/AgCl electrodes to improve the contact and adhesion between the electrode and the skin, dry electrodes are prone to movement. Considering that the conductive hydrogel dries over time, the use of these electrodes often creates an imbalanced skin-electrode impedance and a number of sensing issues in the front-end analogue circuit. This issue can be extended to several other electrode types that are commonly in use, in particular, for applications with a need for long-term wearable monitoring such as ambulatory epilepsy monitoring. Liquid metal alloys, such as eutectic gallium indium (EGaIn), can address key critical requirements around consistency and reliability but present challenges on low viscosity and the risk of leakage. To solve these problems, here, we demonstrate the use of a non-eutectic Ga-In alloy as a shear-thinning non-Newtonian fluid to offer superior performance to commercial hydrogel electrodes, dry electrodes, and conventional liquid metals for electrography measurements. This material has high viscosity when still and can flow like a liquid metal when sheared, preventing leakage while allowing the effective fabrication of electrodes. Moreover, the Ga-In alloy not only has good biocompatibility but also offers an outstanding skin-electrode interface, allowing for the long-term acquisition of high-quality biosignals. The presented Ga-In alloy is a superior alternative to conventional electrode materials for real-world elec-trography or bioimpedance measurement."

基金机构：Engineering and Physical Sciences Research Council (EPSRC) [EP/V008382/1]; Australian Research Council [DP230100019]

基金资助正文：This work was funded by Engineering and Physical Sciences Research Council (EPSRC) grant EP/V008382/1 and the Australian Research Council Discovery Project grant DP230100019.