Article
Nanoscience & Nanotechnology
Xiaoyang Zou, Jiaqi Xue, Xiaoting Li, Colin Pak Yu Chan, Ziqi Li, Pengyu Li, Zhengbao Yang, King Wai Chiu Lai
Summary: The human forearm is a highly dense and irregularly distributed part of the body with specific muscles controlling hand motions. Developing elastic electrodes with stretchability and biocompatibility is essential for acquiring high-fidelity sEMG signals from forearm muscles and improving human-machine interface applications. In this study, a nanocomposite hybrid on-skin electrode was fabricated by incorporating silver nanowires into polydimethylsiloxane, which showed promising results in recording high signal-to-noise ratio sEMG signals and accurately recognizing hand gestures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Biomedical
Benjamin C. Fortune, Christopher G. Pretty, Chris J. Cameron, Lachlan R. McKenzie, Logan T. Chatfield, Michael P. Hayes
Summary: This study measured the magnitude and phase imbalance of electrode-skin interface for different electrode pairs, finding that the imbalance can be large and varies between subjects. Using a compensation network can reduce impedance imbalance and decrease bioelectrical signal interference.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2021)
Article
Chemistry, Analytical
Andreia S. P. Sousa, Andreia Noites, Rui Vilarinho, Rubim Santos
Summary: This study observed the evolution of electrode-skin interface impedance of surface EMG electrodes over time. The results showed a decrease in impedance values from minute 5 to minute 15, followed by stabilization till minute 50. These findings have important implications for the methods and data analysis of EMG studies.
Article
Engineering, Biomedical
Yajian Gan, Wenceslas Rahajandraibe, Remy Vauche, Blaise Ravelo, Nominoe Lorriere, Rachid Bouchakour
Summary: This paper investigates the origin of noise in ECG signals and proposes a significant noise reduction solution based on monitoring a capacitor.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2022)
Article
Biophysics
Ana Arche-Nunez, Peter Krebsbach, Bara Levit, Daniel Possti, Aaron Gerston, Thorsten Knoll, Thomas Velten, Chen Bar-Haim, Shani Oz, Shira Klorfeld-Auslender, Gerardo Hernandez-Sosa, Anat Mirelman, Yael Hanein
Summary: This study analyzed the noise characteristics of dry electrodes and investigated the impact of physiological activity on the link between impedance and noise. The results showed that baseline noise values from dry electrodes on the arm were consistent with the Nyquist equation, while the measured noise values on the face were higher than predicted. The study also examined the effects of different electrode properties on performance.
PHYSIOLOGICAL MEASUREMENT
(2023)
Article
Chemistry, Physical
Mei Luo, Marco-Tulio F. Rodrigues, Leon L. Shaw, Daniel P. Abraham
Summary: The n:p ratio is crucial for lithium-ion cell design and performance. Higher n:p ratio leads to better reversibility, capacity retention, and lower impedance rise due to smaller volume changes in silicon particles during electrochemical cycling.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Analytical
Yiping Huang, Yatong Song, Li Gou, Yuanwen Zou
Summary: Wearable flexible silver electrodes based on cowhide were prepared and tested for their waveform transmission and impedance. The results showed that these electrodes were comparable to standard gel electrodes when the skin is moist enough, and had higher signal-to-noise ratios than the standard electrodes in the standing posture.
Article
Engineering, Environmental
Hui Yuan, Runzhou Jia, Hai Yao, Wei Wang, Kun Qian, Xulei Wu, Jing Li, Zhengtao Wang, Luying Lv, Menghong Han, Yuzhen Dong, Huatao Wang
Summary: In this paper, a serpentine stretchable conductor with high conductivity, stretchability, and ultra-stability is fabricated by wrapping an elastic sheath on the surface of a nanocomposite conductive yarn. The stretchable conductor exhibits distinctive strain-insensitive behavior and ultra-high quality factor, making it suitable for various applications in flexible electronics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Yazhou Zhang, Jinli Zhou, Hongying Yang, Qingxia Liu, Ming Wang, Fan Xiong, Dongyi Chen, Lixin Du
Summary: This study investigates the impact of a fabric electrode skin interface filling medium on ECG signals under dynamic and static conditions. Cotton fabric electrodes were prepared and integrated into a physiotherapy-grade elastic bandage to assemble the fabric ECG tape. The results show that the coating of the fabric electrode with a dielectric reagent greatly reduces electrode-skin contact impedance and improves the stability of the ECG signal.
Article
Engineering, Biomedical
Sourav Chandra, Jinghua Li, Babak Afsharipour, Andres F. Cardona, Nina L. Suresh, Limei Tian, Yujun Deng, Yishan Zhong, Zhaoqian Xie, Haixu Shen, Yonggang Huang, John A. Rogers, William Z. Rymer
Summary: The novel tattoo electrode demonstrated excellent fidelity and stability in recording high-density surface electromyography, showing promise for clinical tracking and research of neuromuscular disorders.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2021)
Article
Chemistry, Analytical
Brendan B. Murphy, Brittany H. Scheid, Quincy Hendricks, Nicholas Apollo, Brian Litt, Flavia Vitale
Summary: The study investigated the impedance behavior at the skin-electrode interface and the impact of skin treatments on its stability, demonstrating that impedance becomes more uniform across groups over time and treatment, with removal of superficial epidermal layers being crucial for achieving a low, long-term stable interface impedance.
Article
Chemistry, Analytical
Bulcha Belay Etana, Benny Malengier, Timothy Kwa, Janarthanan Krishnamoorthy, Lieva Van Langenhove
Summary: The effect of load and holding contact pressure on embroidered textile electrodes used as surface electromyography sensors was studied. The contact reliability and repeatability were improved by controlling the contact pressure and load. The quantitative analysis showed that the signal quality of the textile electrodes was comparable to that of traditional electrodes.
Article
Construction & Building Technology
Bin Liang, Hai Zhang, Zhongxian Liu, Jilin Hou
Summary: The investigation of masonry buildings in Chinese villages revealed that over 90% of the buildings were made of masonry structures. The use of mortars in these structures has evolved from mud to white clay/slag and eventually to cement. This article highlights the discrepancy in compressive strength between the Chinese standard code and experimental results, prompting the testing of masonry columns with different types of mortars to modify the equations. The research delves into the stress-strain curve, elastic modulus, Poisson's ratio, and compressive strength of masonry columns. The findings indicate that the compressive strength of the masonry increases with the strength of the mortar. The experimental values were 1.2 times higher than the calculated values specified in the code, leading to the proposal of a revised equation for masonry considering stress-strain relationship, elastic modulus, Poisson's ratio, and compressive strength.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Physics, Applied
Byeong-Cheol Kang, Tae-Jun Ha
Summary: In this study, a solution-processed trapezoidal electrode array is demonstrated for highly sensitive and reliable detection of EEG signals even when in direct contact with the scalp. The electrode based on nanocomposites showed low contact impedance and high sensitivity, without the need for conductive gels or electrolytes.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xu Bai, Jiangtao Sun, Kangqi Liu, Xiaolin Li, Lijun Xu
Summary: This article presents a thorough analysis of switching noise in an EIT system and proposes a comprehensive noise model that takes into account the impacts of switching noise, frame rate, and bandwidth. Simulation and experimental results demonstrate that the proposed model can guide the improvement of the comprehensive performance of an EIT system for clinical applications. The EIT system can achieve high average SNR values of over 94 dB and 90 dB with different frame rates and bandwidths.
IEEE SENSORS JOURNAL
(2023)
Article
Clinical Neurology
Lixia Chen, Chunjie Bai, Yanan Zheng, Lai Wei, Cuihua Han, Na Yuan, Daihong Ji
Summary: This study investigated the association between hypertension and sleep measures, as well as quality of life (QoL), in patients with obstructive sleep apnea (OSA). The results showed that in patients with OSA, nocturnal minimum oxygen saturation was negatively correlated with QoL measures. In patients with OSA and hypertension, sleep duration was negatively correlated with QoL measures. QoL in patients with mild, moderate, and severe OSA was associated with depression and anxiety.
SLEEP AND BREATHING
(2023)
Review
Nursing
Lixia Chen, Juan Yin, Yanan Zheng, Chunhong Zhao, Han Zhang, Jianhua Li, Daihong Ji, Yin-Ping Zhang
Summary: This study is a systematic review and meta-analysis evaluating the effectiveness of background music listening on sleep quality, psychological outcomes, and physiological outcomes for critically ill patients in intensive care units (ICUs). The results showed that background music listening can improve sleep quality, anxiety, and depression in critically ill patients.
NURSING IN CRITICAL CARE
(2023)
Article
Materials Science, Ceramics
Shiyan Ma, Yan Gao, Liang Wu, Ji Ma, Hui Zhang, Xiang Liu, Lingde Kong, Wenhong Zhong, Hongxi Liu, Qingming Chen, Sheng'an Yang
Summary: The properties of La0.68Nd0.04Ca0.28MnO3/Ag-x composites were investigated and it was found that the addition of Ag significantly improved the temperature coefficient of resistivity and magnetoresistance. The crystal structure, surface morphology, chemical composition, element valence, and electrical transport characterizations of the samples were systematically studied using various characterization techniques such as XRD, SEM, EDS, XPS, and four-probe method.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zhiyuan Yu, Xin Gu, Yu Gao, Xiaoli Guan, Shuaizhao Jin, Hongjiang Li, Hui Zhang, Xiang Liu
Summary: La0.67K0.33-xSrxMnO3 thin films were grown on LaAlO3 (010) substrates via sol-gel and spin coating methods. The replacement of K ions with Sr ions affected the eg electron bandwidth and concentration of Mn3+/Mn4+ pairs as well as effectively modulated the magnetic/orbital order and lattice structure. The superior La0.67K0.27Sr0.06MnO3 film exhibited a maximum TCR of 11.88% K-1 (298.3 K), which is approximately 31% higher than that of bulk ceramic with the same composition. The as-developed films exhibit significant potential for application in uncooled infrared bolometers.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yiwei Liu, Run-Wei Li, Shengding Wang, Chao Liu, Jinyun Liu, Shiying Li, Feng Xu, Dan Xu, Wuxu Zhang, Yuanzhao Wu, Jie Shang
Summary: Ga-based liquid metal stretchable conductors have attracted attention in flexible electronic devices due to their stable electrical performance and strong interfacial bonding. In this study, a stable conductor with superior electrical stability and tough interface bonding is achieved by casting curable polymers and peeling-activated process from liquid metal particles. The conductor shows strain-insensitivity and immunity to cyclic deformation, and the interfacial adhesion properties are effectively improved by embedding liquid metal within the elastomer.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Metallurgy & Metallurgical Engineering
Yuan Zhang, Xiang Liu, Chang-jun Wang, Chang Liu
Summary: PH13-8Mo stainless steel powder with high sphericity and well fluidity was prepared by the plasma rotating electrode process, and formed parts with ultra-high purity were manufactured by selective laser melting. The addition of heat treatment enlarged the grains and increased the average grain size, and the formed parts were mainly composed of martensite and retained austenite with NiAl and M23C6 precipitates. The optimal heat treatment process of 925℃×1 h WC + 0℃×2 h AC + 540℃×4 h AC resulted in PH13-8Mo formed parts with the best comprehensive mechanical properties.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Liming Zhao, Xingrui Pu, Xiaoli Guan, Shuaizhao Jin, Xiaohan Yu, Kaikai Wu, Yixin Yan, Xin Gu, Xiang Liu
Summary: Pr-0.6(Sr1-xKx)(0.4)MnO3 polycrystalline ceramics (PSKMO, 0 <= x <= 0.25) were prepared using the sol-gel method. The PSKMO ceramics exhibited an orthorhombic structure with Pnma space group. As the K-concentration increased, the grain sizes also increased significantly, and the constituent elements were uniformly distributed on the surface. The resistivity of the ceramics increased with the increase in K-concentration. Moreover, the TCR and T-k decreased with increasing x, which was attributed to the disorder of cation size on the A-site and the distortion of MnO6 octahedron, resulting in the localization of electrons and a reduction in T-k. The highest TCR value reached 7.60% K-1 at 299.31 K (for x = 0.15), suggesting the suitability of Pr-0.6(Sr0.85K0.15)(0.4)MnO3 ceramic for advanced uncooled infrared bolometers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Analytical
Tian Hua, Ziyin Xiang, Xiangling Xia, Zhangling Li, Dandan Sun, Yuanzhao Wu, Yiwei Liu, Jie Shang, Jun Chen, Runwei Li
Summary: This paper proposes to increase the ladder structure based on the basic microstructures in order to improve the performance of flexible capacitive pressure sensors. By comparing different microstructures through finite element simulation, it is found that the sensor with a cylindrical ladder microstructure dielectric layer has the highest sensitivity. The sensor developed with this microstructure has a sensitivity of 0.12 kPa(-1), which is about 3.9 times higher than that without microstructure, making it an ideal solution for real-time monitoring of rainfall frequency.
Review
Chemistry, Analytical
Lili Pan, Yali Xie, Huali Yang, Mengchao Li, Xilai Bao, Jie Shang, Run-Wei Li
Summary: With advantages of high sensitivity, high stability, high flexibility, low cost, and simple manufacturing, flexible magnetic field sensors have potential applications in various fields such as geomagnetosensitive E-Skins, magnetoelectric compass, and non-contact interactive platforms. This paper introduces the research progress of flexible magnetic field sensors, including preparation, performance, related applications, etc., based on the principles of various magnetic field sensors. In addition, the prospects and challenges of flexible magnetic field sensors are presented.
Article
Materials Science, Multidisciplinary
Xin Gu, Shuaizhao Jin, Zhiyuan Yu, Xiaokun Zhu, Kaikai Wu, Liming Zhao, Yixin Yan, Qingming Chen, Xiang Liu
Summary: In this study, refined LaxCa0.89-xSr0.11MnO3 (LCSMO, x = 0.65, 0.68, 0.71 and 0.74) films were prepared using the sol-gel spin-coating method. The influence of La3+ content on the structural properties of LCSMO films was investigated, showing that LCSMO films can grow well on SrTiO3 (00l) substrate. X-ray photoemission spectroscopy confirmed the weakening of the double exchange effect due to La3+ doping. La3+ doping and interconnected grain boundaries resulted in the weakening of the double exchange effect and grain boundary scattering, respectively. The resistivity of LCSMO films was less than 7.1 x 10(-4) Ω.cm at a low temperature of 100K, attributed to the superior grain boundary connectivity. It was also found that by keeping the Sr2+ content constant, the temperature (T-k) corresponding to the temperature coefficient of resistivity (TCR) can be controlled at room temperature. At x = 0.71, the peak TCR value was found to be 8.84%/K and the corresponding T-k was 283.15K. These results are important for the advanced application of uncooling infrared bolometer.
Article
Chemistry, Physical
Chao Liu, Yuwei Wang, Shengding Wang, Xiangling Xia, Huiyun Xiao, Jinyun Liu, Siqi Hu, Xiaohui Yi, Yiwei Liu, Yuanzhao Wu, Jie Shang, Run-Wei Li
Summary: This paper presents a stretchable conductor with a linear bunch structure, which is designed and prepared by combining numerical modeling and simulation with 3D printing technology. This conductor has a very high conductivity, good stretchability, and great tensile stability, and it can be used to transmit electrical signals and energy with good application potential.
Article
Physics, Applied
Jun Yu, Jie Yao, Decai Li, Jianping Yu, Huiyun Xiao, Haifeng Zhang, Jie Shang, Yuanzhao Wu, Yiwei Liu, Run-Wei Li
Summary: This paper proposes a non-linear electromagnetic vibration energy harvester lubricated by magnetic fluid, which uses fixed small magnets to reduce natural frequency and prevent flipping, elastomers to prevent magnet damage, and magnetic fluid to improve output voltage. The experiment results show that the device with magnetic fluid lubrication has an increased output power of 291%.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Junlin Fang, Zhenhua Tang, Xi-Qi Li, Zhao-Yuan Fan, Yan-Ping Jiang, Qiu-Xiang Liu, Xin-Gui Tang, Jing-Min Fan, Ju Gao, Jie Shang
Summary: MXene materials combined with metal oxides were utilized to prepare Au/MXene/NiO/FTO heterojunction memristors. These memristors exhibit improved electrical properties and synaptic behavior simulation compared to traditional von Neumann structures. Furthermore, they have better weight update linearity and conductivity modulation behavior, as well as long data retention time characteristics. By implementing improved random adaptive algorithms, the recognition accuracy of the convolutional neural network using these memristors was significantly improved on the MNIST and Fashion-MNIST datasets.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Xiaokun Zhu, Shuaizhao Jin, Xiaohan Yu, Zhiyuan Yu, Xin Gu, Xiaoli Guan, Kaikai Wu, Yixin Yan, Liming Zhao, Jiamei Han, Jiabin Jiang, Xiang Liu, Xiangming Li
Summary: La0.7Ag0.3-xKxMnO3 (LAKMO, x = 0.15, 0.16, 0.17, 0.18, and 0.19) films with excellent electrical properties and low surface roughness were prepared by spin-coating on SrTiO3 (001) substrates. The crystal structures and ion valence states of the LAKMO films were modified by adjusting the doping amounts of Ag and K. The electrical transport properties, especially the temperature coefficient of resistivity (TCR), can be refined or optimized via A-site Ag and K co-doping, making LAKMO films suitable for uncooled infrared bolometers.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Xin Gu, Kaikai Wu, Liming Zhao, Yixin Yan, Jiabin Jiang, Jiamei Han, Hui Zhang, Qingming Chen, Xiang Liu
Summary: This study explores the electrical transport properties of La-x(Ca1-ySry)(1-x)MnO3 and finds that LCSMO films at high sintering temperatures exhibit high crystallinity and large room-temperature TCR values, which is of great significance for the application of uncooled bolometers.
CERAMICS INTERNATIONAL
(2023)
