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Cao X, Li Q, Li S, Xu X, Wang L, Wang M, Ding B, Bao S, Wang S, Sun B, Cui J, Wang G, Li H, Su Y. Low-Cost Photoelectric Flow Rate Sensors Based on a Flexible Planar Curved Beam Structure for Clinical Treatments. Adv Healthc Mater 2024; 13:e2304573. [PMID: 38558375 DOI: 10.1002/adhm.202304573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/17/2024] [Indexed: 04/04/2024]
Abstract
In clinical treatments, reliable flow rate measurements ensure accurate drug delivery during infusions, precise gas delivery during artificial ventilations, etc., thereby reducing patient morbidity and mortality. However, precise flow rate sensors are costly, so medical devices with limited budgets choose cheaper but unsatisfactory flow rate measurement approaches, leading to increased medical risks. Here, a photoelectric flow rate sensor based on a flexible planar curved beam structure (FPCBS) is proposed. The FPCBS ensures low out-of-plane stiffness of the sensitive sheet and allows large deformation in the elastic range, enabling the flow rate sensor to measure the flow rate with high sensitivity over a wide range. Meanwhile, the flow rate sensor can be mass-produced using mature materials and manufacturing technology at less than $5 each. The flow rate sensors are integrated into a commercial infusion pump to measure drug infusion and a home ventilator to monitor respiration. The results are comparable to those measured by a commercial flow rate sensor, demonstrating the applicability of the sensor. Considering its proven outstanding performance at low cost, the flow rate sensor shows great potential in clinical treatment, medical diagnosis, and other medical fields.
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Affiliation(s)
- Xinfang Cao
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qinlan Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuang Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xinkai Xu
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Liyang Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Mengjie Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Bo Ding
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Shengwen Bao
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Shugang Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Bao Sun
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Jingqiang Cui
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Guosheng Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Huiling Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yewang Su
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
- Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
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2
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Wu Z, Dong J, Guo H, Shang R, Qin X, Xia Y, Li X, Zhao X, Ji C, Zhang Q. Robust, Self-Healing, and Multi-Use Poly(Urethane-Urea-Imide) Elastomer as a Durable Adhesive for Thermal Interface Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401815. [PMID: 38573922 DOI: 10.1002/smll.202401815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 03/20/2024] [Indexed: 04/06/2024]
Abstract
Currently, research on thermal interface materials (TIMs) is primarily focused on enhancing thermal conductivity. However, strong adhesion and multifunctionality are also important characteristics for TIMs when pursing more stable interface heat conduction. Herein, a novel poly(urethane-urea-imide) (PUUI) elastomer containing abundant dynamic hydrogen bonds network and reversible disulfide linkages is successfully synthesized for application as a TIM matrix. The PUUI can self-adapt to the metal substrate surface at moderate temperatures (80 °C) and demonstrates a high adhesion strength of up to 7.39 MPa on aluminum substrates attributed its noncovalent interactions and strong intrinsic cohesion. Additionally, the PUUI displays efficient self-healing capability, which can restore 94% of its original mechanical properties after self-healing for 6 h at room temperature. Furthermore, PUUI composited with aluminum nitride and liquid metal hybrid fillers demonstrates a high thermal conductivity of 3.87 W m-1 K-1 while maintaining remarkable self-healing capability and adhesion. When used as an adhesive-type TIM, it achieves a low thermal contact resistance of 22.1 mm2 K W-1 at zero pressure, only 16.7% of that of commercial thermal pads. This study is expected to break the current research paradigm of TIMs and offers new insights for the development of advanced, reliable, and sustainable TIMs.
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Affiliation(s)
- Zhiqiang Wu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Jie Dong
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Han Guo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Rui Shang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xiuzhi Qin
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Yanfei Xia
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xiuting Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xin Zhao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Chengchang Ji
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Qinghua Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
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Xu K, Li Q, Lu Y, Luo H, Jian Y, Li D, Kong D, Wang R, Tan J, Cai Z, Yang G, Zhu B, Ye Q, Yang H, Li T. Laser Direct Writing of Flexible Thermal Flow Sensors. NANO LETTERS 2023; 23:10317-10325. [PMID: 37937967 DOI: 10.1021/acs.nanolett.3c02891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Thin film-based thermal flow sensors afford applications in healthcare and industries owing to their merits in preserving initial flow distributions. However, traditional thermal flow sensors are primarily applied to track flow intensities based on hot-wire or hot-film sensing mechanisms due to their relatively facile device configurations and fabrication strategies. Herein, a calorimetric thermal flow sensor is proposed based on laser direct writing to form laser-induced graphene as heaters and temperature sensors, resulting in monitoring both flow intensities and orientations. Via homogeneously surrounding spiral heaters with multiple temperature sensors, the device exhibits high sensitivity (∼162 K·s/m) at small flows with an extended flow detection range (∼25 m/s). Integrating the device with a data-acquisition board and a dual-mode graphical user interface enables wirelessly and dynamically monitoring respiration and the motion of robotic arms. This versatile flow sensor with facile manufacturing affords potentials in health inspection, remote monitoring, and studying hydrodynamics.
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Affiliation(s)
- Kaichen Xu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qi'ao Li
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yuyao Lu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Huayu Luo
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yihui Jian
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Dingwei Li
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, Zhejiang, China
| | - Depeng Kong
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ruohan Wang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jibing Tan
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Zimo Cai
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Geng Yang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Bowen Zhu
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, Zhejiang, China
| | - Qingqing Ye
- State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanics, Zhejiang University, Hangzhou 310027, China
| | - Huayong Yang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Tiefeng Li
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
- Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University, 310027 Hangzhou, China
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4
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Lu Y, Kong D, Yang G, Wang R, Pang G, Luo H, Yang H, Xu K. Machine Learning-Enabled Tactile Sensor Design for Dynamic Touch Decoding. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303949. [PMID: 37740421 PMCID: PMC10646241 DOI: 10.1002/advs.202303949] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/15/2023] [Indexed: 09/24/2023]
Abstract
Skin-like flexible sensors play vital roles in healthcare and human-machine interactions. However, general goals focus on pursuing intrinsic static and dynamic performance of skin-like sensors themselves accompanied with diverse trial-and-error attempts. Such a forward strategy almost isolates the design of sensors from resulting applications. Here, a machine learning (ML)-guided design of flexible tactile sensor system is reported, enabling a high classification accuracy (≈99.58%) of tactile perception in six dynamic touch modalities. Different from the intuition-driven sensor design, such ML-guided performance optimization is realized by introducing a support vector machine-based ML algorithm along with specific statistical criteria for fabrication parameters selection to excavate features deeply concealed in raw sensing data. This inverse design merges the statistical learning criteria into the design phase of sensing hardware, bridging the gap between the device structures and algorithms. Using the optimized tactile sensor, the high-quality recognizable signals in handwriting applications are obtained. Besides, with the additional data processing, a robot hand assembled with the sensor is able to complete real-time touch-decoding of an 11-digit braille phone number with high accuracy.
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Affiliation(s)
- Yuyao Lu
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
| | - Depeng Kong
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
| | - Geng Yang
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
- Zhejiang Key Laboratory of Intelligent Operation and Maintenance RobotHangzhou310000China
| | - Ruohan Wang
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
| | - Gaoyang Pang
- School of Electrical and Information EngineeringThe University of SydneySydneyNSW2006Australia
| | - Huayu Luo
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
| | - Huayong Yang
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
| | - Kaichen Xu
- State Key Laboratory of Fluid Power and Mechatronic SystemsSchool of Mechanical EngineeringZhejiang UniversityHangzhou310027China
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5
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Yao P, Bao Q, Yao Y, Xiao M, Xu Z, Yang J, Liu W. Environmentally Stable, Robust, Adhesive, and Conductive Supramolecular Deep Eutectic Gels as Ultrasensitive Flexible Temperature Sensor. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2300114. [PMID: 36847514 DOI: 10.1002/adma.202300114] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/21/2023] [Indexed: 05/26/2023]
Abstract
It is essential and of great significance to impart high mechanical performance, environmental stability, and high sensitivity to emerging flexible temperature sensors. In this work, polymerizable deep eutectic solvents are designed and prepared by simply mixing N-cyanomethyl acrylamide (NCMA) containing an amide group and a cyano group in the same side chain with lithium bis(trifluoromethane) sulfonimide (LiTFSI), and obtain supramolecular deep eutectic polyNCMA/LiTFSI gels after polymerization. These supramolecular gels exhibit excellent mechanical performance (tensile strength of 12.9 MPa and fracture energy of 45.3 kJ m-2 ), strong adhesion force, high-temperature responsiveness, self-healing ability, and shape memory behavior due to the reversible reconstruction ability of amide hydrogen bonds and cyano-cyano dipole-dipole interactions in the gel network. In addition, the gels also demonstrate good environmental stability and 3D printability. To verify its application potential as a flexible temperature sensor, the polyNCMA/LiTFSI gel-based wireless temperature monitor is developed and displays outstanding thermal sensitivity (8.4%/K) over a wide detection range. The preliminary result also suggests the promising potential of PNCMA gel as a pressure sensor.
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Affiliation(s)
- Puqing Yao
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
| | - Qiwen Bao
- School of Precision Instrument and Optoelectronic Engineering, The State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China
| | - Yuan Yao
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
| | - Meng Xiao
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
| | - Ziyang Xu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
| | - Jianhai Yang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
| | - Wenguang Liu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China
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6
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Silva-Neto HA, Arantes IV, Ferreira AL, do Nascimento GH, Meloni GN, de Araujo WR, Paixão TR, Coltro WK. Recent advances on paper-based microfluidic devices for bioanalysis. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Lee SY, Lim H, Bae JH, Chae D, Paik T, Lee H, Oh SJ. Designing a self-classifying smart device with sensor, display, and radiative cooling functions via spectrum-selective response. NANOSCALE HORIZONS 2022; 7:1087-1094. [PMID: 35903990 DOI: 10.1039/d2nh00206j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This paper presents a self-classifying smart device that intelligently differentiates and operates three functions: electroluminescence display, ultraviolet light sensor, and thermal management via radiative cooling. The optical and electrical properties of the materials and structures are designed to achieve a spectrum-selective response, which enables the integration of the aforementioned functions into one device without any noise or interference. Spectrum-selective materials that absorb, emit, and radiate light with ultraviolet to mid-infrared wavelengths and device structures designed to prevent interference are achieved by using thin metal films, dielectric layers, and nanocrystals. The designed self-classifying smart device exhibits bright blue light emission upon current supply (display), green light emission upon exposure to UV light (sensor), and radiative cooling (thermal management). Furthermore, a smart device and house system with a display, UV light sensor, and radiative cooling performance was demonstrated. The findings of this study open new avenues for device integration in next-generation wearable device fabrication.
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Affiliation(s)
- Sang Yeop Lee
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Hangyu Lim
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Jung Ho Bae
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Dongwoo Chae
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Taejong Paik
- School of Integrative Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Heon Lee
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Soong Ju Oh
- Department of Materials Science and Engineering, Korea University 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea.
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8
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Murakami K, Shiraishi D, Mizumi S, Oya Y, Omura N, Shibata T, Ichikawa Y, Motosuke M. Development of a Flexible MEMS Sensor for Subsonic Flow. MICROMACHINES 2022; 13:1299. [PMID: 36014221 PMCID: PMC9415156 DOI: 10.3390/mi13081299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/03/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Detection and control of flow separation is a key to improving the efficiency of fluid machinery. In this study, we developed a flexible MEMS (microelectromechanical systems) sensor for measuring the wall shear stress and flow angle in subsonic airflow. The developed sensor is made of a flexible polyimide film and a microheater surrounded by three temperature sensor pairs. The sensor measures the wall shear stress from the heater output and the flow angle from the temperature gradient around the heater. The geometry and design of the heater and temperature sensors were determined based on numerical simulations. To evaluate the validity of the sensor, we conducted an experiment to measure the wall shear stress and the flow angle in a wind tunnel in different velocities ranging from 30 m/s to 170 m/s, equivalent to Mach numbers from 0.1 to 0.5. The heater output was proportional to one-third power of the wall shear stress. Additionally, the bridge output correlating the temperature difference between two opposing temperature sensors showed sinusoidal variation depending on the flow angle. Consequently, we have clarified that the developed sensor can measure both the wall shear stress and flow direction in subsonic flow.
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Affiliation(s)
- Koichi Murakami
- Department of Mechanical Engineering, Graduate School of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
| | - Daiki Shiraishi
- Department of Mechanical Engineering, Graduate School of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
| | - Shunsuke Mizumi
- Research and Innovation Center, Mitsubishi Heavy Industries, Takasago City 676-8686, Japan
| | - Yoshiko Oya
- Research and Innovation Center, Mitsubishi Heavy Industries, Takasago City 676-8686, Japan
| | - Naoto Omura
- Research and Innovation Center, Mitsubishi Heavy Industries, Takasago City 676-8686, Japan
| | - Takanori Shibata
- Department of Systems Innovation Engineering, Faculty of Science and Engineering, Iwate University, Morioka 020-8551, Japan
| | - Yoshiyasu Ichikawa
- Department of Mechanical Engineering, Faculty of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
- Water Frontier Research Center, Research Institute for Science and Technology, Tokyo University of Science, Tokyo 162-8601, Japan
| | - Masahiro Motosuke
- Department of Mechanical Engineering, Faculty of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan
- Water Frontier Research Center, Research Institute for Science and Technology, Tokyo University of Science, Tokyo 162-8601, Japan
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9
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Lu Y, Yang G, Shen Y, Yang H, Xu K. Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics. NANO-MICRO LETTERS 2022; 14:150. [PMID: 35869398 PMCID: PMC9307709 DOI: 10.1007/s40820-022-00895-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 06/02/2022] [Indexed: 05/14/2023]
Abstract
In the past decade, the global industry and research attentions on intelligent skin-like electronics have boosted their applications in diverse fields including human healthcare, Internet of Things, human-machine interfaces, artificial intelligence and soft robotics. Among them, flexible humidity sensors play a vital role in noncontact measurements relying on the unique property of rapid response to humidity change. This work presents an overview of recent advances in flexible humidity sensors using various active functional materials for contactless monitoring. Four categories of humidity sensors are highlighted based on resistive, capacitive, impedance-type and voltage-type working mechanisms. Furthermore, typical strategies including chemical doping, structural design and Joule heating are introduced to enhance the performance of humidity sensors. Drawing on the noncontact perception capability, human/plant healthcare management, human-machine interactions as well as integrated humidity sensor-based feedback systems are presented. The burgeoning innovations in this research field will benefit human society, especially during the COVID-19 epidemic, where cross-infection should be averted and contactless sensation is highly desired.
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Affiliation(s)
- Yuyao Lu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Geng Yang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
| | - Yajing Shen
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, People's Republic of China
| | - Huayong Yang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Kaichen Xu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
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10
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Veerapandian S, Kim W, Kim J, Jo Y, Jung S, Jeong U. Printable inks and deformable electronic array devices. NANOSCALE HORIZONS 2022; 7:663-681. [PMID: 35660837 DOI: 10.1039/d2nh00089j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Deformable printed electronic array devices are expected to revolutionize next-generation electronics. However, although remarkable technological advances in printable inks and deformable electronic array devices have recently been achieved, technical challenges remain to commercialize these technologies. In this review article a brief introduction to printing methods highlighting significant research studies on ink formation for conductors, semiconductors, and insulators is provided, and the structural design and successful printing strategies of deformable electronic array devices are described. Successful device demonstrations are presented in the applications of passive- and active-matrix array devices. Finally, perspectives and technological challenges to be achieved are pointed out to print practically available deformable devices.
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Affiliation(s)
- Selvaraj Veerapandian
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea.
| | - Woojo Kim
- Department of Convergence IT Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea
| | - Jaehyun Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea.
| | - Youngmin Jo
- Department of Convergence IT Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea
| | - Sungjune Jung
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea.
- Department of Convergence IT Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea
| | - Unyong Jeong
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of Korea.
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11
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Heng W, Solomon S, Gao W. Flexible Electronics and Devices as Human-Machine Interfaces for Medical Robotics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107902. [PMID: 34897836 PMCID: PMC9035141 DOI: 10.1002/adma.202107902] [Citation(s) in RCA: 107] [Impact Index Per Article: 53.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 12/08/2021] [Indexed: 05/02/2023]
Abstract
Medical robots are invaluable players in non-pharmaceutical treatment of disabilities. Particularly, using prosthetic and rehabilitation devices with human-machine interfaces can greatly improve the quality of life for impaired patients. In recent years, flexible electronic interfaces and soft robotics have attracted tremendous attention in this field due to their high biocompatibility, functionality, conformability, and low-cost. Flexible human-machine interfaces on soft robotics will make a promising alternative to conventional rigid devices, which can potentially revolutionize the paradigm and future direction of medical robotics in terms of rehabilitation feedback and user experience. In this review, the fundamental components of the materials, structures, and mechanisms in flexible human-machine interfaces are summarized by recent and renowned applications in five primary areas: physical and chemical sensing, physiological recording, information processing and communication, soft robotic actuation, and feedback stimulation. This review further concludes by discussing the outlook and current challenges of these technologies as a human-machine interface in medical robotics.
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Affiliation(s)
- Wenzheng Heng
- Andrew and Peggy Cherng Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Samuel Solomon
- Andrew and Peggy Cherng Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Wei Gao
- Andrew and Peggy Cherng Department of Medical Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
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12
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Flexible Ceramic Film Sensors for Free-Form Devices. SENSORS 2022; 22:s22051996. [PMID: 35271141 PMCID: PMC8914772 DOI: 10.3390/s22051996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 02/06/2023]
Abstract
Recent technological innovations, such as material printing techniques and surface functionalization, have significantly accelerated the development of new free-form sensors for next-generation flexible, wearable, and three-dimensional electronic devices. Ceramic film sensors, in particular, are in high demand for the production of reliable flexible devices. Various ceramic films can now be formed on plastic substrates through the development of low temperature fabrication processes for ceramic films, such as photocrystallization and transferring methods. Among flexible sensors, strain sensors for precise motion detection and photodetectors for biomonitoring have seen the most research development, but other fundamental sensors for temperature and humidity have also begun to grow. Recently, flexible gas and electrochemical sensors have attracted a lot of attention from a new real-time monitoring application that uses human breath and perspiration to accurately diagnose presymptomatic states. The development of a low-temperature fabrication process of ceramic film sensors and related components will complete the chemically stable and reliable free-form sensing devices by satisfying the demands that can only be addressed by flexible metal and organic components.
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13
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Wang D, Liu D, Xu J, Fu J, Wu K. Highly thermoconductive yet ultraflexible polymer composites with superior mechanical properties and autonomous self-healing functionality via a binary filler strategy. MATERIALS HORIZONS 2022; 9:640-652. [PMID: 34881768 DOI: 10.1039/d1mh01746b] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
It is still a formidable challenge to develop ideal thermal dissipation materials with simultaneous high thermal conductivity, excellent mechanical softness and toughness, and spontaneous self-healing. Herein, we report the introduction of sandwich-like boron nitride nanosheets-liquid metal binary fillers into an artificial poly(urea-urethane) elastomer to address the above issue, which confers the composite elastomer with a unique thermal-mechanical-healing combination, including a low modulus, high in-plane thermal conductivity and high mass loading of rigid fillers but self-recoverability and room-temperature self-healing.
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Affiliation(s)
- Dong Wang
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
| | - Dingyao Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu 610065, China
| | - JianHua Xu
- Joint Laboratory of Advanced Biomedical Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, P. R. China
| | - JiaJun Fu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
| | - Kai Wu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu 610065, China
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14
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15
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Lu Y, Fujita Y, Honda S, Yang S, Xuan Y, Xu K, Arie T, Akita S, Takei K. Wireless and Flexible Skin Moisture and Temperature Sensor Sheets toward the Study of Thermoregulator Center. Adv Healthc Mater 2021; 10:e2100103. [PMID: 33955182 DOI: 10.1002/adhm.202100103] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 04/14/2021] [Indexed: 12/25/2022]
Abstract
A disorder in the thermoregulator center in a human body leads to some potential diseases such as fever and hyperthyroidism. To predict these diseases early, monitoring the health condition of the human body due to the influence of thermoregulation disorders is important. Although extensive works are performed on sweat-rate detection by constructing microfluidic channels, skin-moisture evaporation before sweating remains unknown. This work proposes a wireless and flexible sensor sheet to investigate the thermoregulatory responses of different people under cold stimulation and exercise by measuring the temperature and moisture variations on the finger skin. An integrated flexible sensor system consists of a ZnIn2 S4 nanosheet-based humidity sensor and carbon nanotube/SnO2 temperature sensor. The results exhibit distinct thermoregulation abilities of five volunteers. Interestingly, the sudden increase in finger moisture that results from the excitation by the sympathetic nerve is observed during the cold-stimulus test. Although further studies are required to predict the potential diseases resulted from thermoregulation disorders in human body, this study provides a possibility of continuous and real-time monitoring of thermoregulatory activities via skin moisture and temperature detection using a flexible sensor sheet.
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Affiliation(s)
- Yuyao Lu
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Yusuke Fujita
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Satoko Honda
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Shin‐Hsin Yang
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Yan Xuan
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Kaichen Xu
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Takayuki Arie
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Seiji Akita
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
| | - Kuniharu Takei
- Department of Physics and Electronics Osaka Prefecture University Sakai Osaka 599‐8531 Japan
- JST PRESTO Kawaguchi Saitama 332‐0012 Japan
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16
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Shi X, Wu P. A Smart Patch with On-Demand Detachable Adhesion for Bioelectronics. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2101220. [PMID: 34105250 DOI: 10.1002/smll.202101220] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/13/2021] [Indexed: 06/12/2023]
Abstract
A smart ionic skin patch with on-demand detachable adhesion has been developed as human-machine interface for physiological signal monitoring. In spite of the multifunctions demonstrated by existing ionic skin, it is still difficult to distinguish different signals simultaneously. Moreover, the secondary damages to the tissues are often overlooked when the adhesive materials are removing from the wound. Herein, a multifunctional biomimetic hydrogel with temperature, mechanical, electrical, and pH response is developed. This hydrogel is designed by in situ polymerizing of hydrophilic anion monomers in a natural cationic polysaccharide to construct multifunctional biomimetic ionic channel. Due to the reversible physical cross-linked network and thermosensitivity, the mechanical properties, adhesion, and visual effect of the hydrogel can be tuned by changing hydrogen bonding density via phase transition, thus making it an excellent biosafe material for wearable device. The hydrogel is utilized as skin patch intended for monitoring physiological signals stimulated by physical and chemical changes involving pressure, temperature, pH value, and electrocardiograph. Especially, this ionic skin patch can recognize temperature change signals precisely either in broad or extremely narrow temperature range. This smart skin patch can even recognize the pressure and temperature signals in real time and differentiate the signals simultaneously.
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Affiliation(s)
- Xiaofang Shi
- State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P. R. China
| | - Peiyi Wu
- State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P. R. China
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai, 201620, China
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17
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Feng R, Mu Y, Zeng X, Jia W, Liu Y, Jiang X, Gong Q, Hu Y. A Flexible Integrated Bending Strain and Pressure Sensor System for Motion Monitoring. SENSORS (BASEL, SWITZERLAND) 2021; 21:3969. [PMID: 34207521 PMCID: PMC8226861 DOI: 10.3390/s21123969] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/01/2021] [Accepted: 06/07/2021] [Indexed: 11/27/2022]
Abstract
Flexible sensors have attracted increasing research interest due to their broad application potential in the fields of human-computer interaction, medical care, sports monitoring, etc. Constructing an integrated sensor system with high performance and being capable of discriminating different stimuli remains a challenge. Here, we proposed a flexible integrated sensor system for motion monitoring that can measure bending strain and pressure independently with a low-cost and simple fabrication process. The resistive bending strain sensor in the system is fabricated by sintering polyimide (PI), demonstrating a gauge factor of 9.54 and good mechanical stability, while the resistive pressure sensor is constructed based on a composite structure of silver nanowires (AgNWs) and polydimethylsiloxane (PDMS)-expandable microspheres with a tunable sensitivity and working range. Action recognition is demonstrated by attaching the flexible integrated sensor system on the wrist with independent strain and pressure information recorded from corresponding sensors. It shows a great application potential in motion monitoring and intelligent human-machine interfaces.
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Affiliation(s)
- Rou Feng
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
| | - Yifeng Mu
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
| | - Xiangwen Zeng
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-Based Electronics, Department of Electronics, Peking University, Beijing 100871, China; (X.Z.); (W.J.)
| | - Weijie Jia
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-Based Electronics, Department of Electronics, Peking University, Beijing 100871, China; (X.Z.); (W.J.)
| | - Yuxuan Liu
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
| | - Xijun Jiang
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
| | - Qibei Gong
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
| | - Youfan Hu
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Xiangtan 411105, China; (R.F.); (Y.M.); (Y.L.); (X.J.); (Q.G.)
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-Based Electronics, Department of Electronics, Peking University, Beijing 100871, China; (X.Z.); (W.J.)
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18
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A Flexible Two-Sensor System for Temperature and Bending Angle Monitoring. MATERIALS 2021; 14:ma14112962. [PMID: 34070949 PMCID: PMC8198666 DOI: 10.3390/ma14112962] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/21/2021] [Accepted: 05/28/2021] [Indexed: 01/06/2023]
Abstract
A wearable electronic system constructed with multiple sensors with different functions to obtain multidimensional information is essential for making accurate assessments of a person’s condition, which is especially beneficial for applications in the areas of health monitoring, clinical diagnosis, and therapy. In this work, using polyimide films as substrates and Pt as the constituent material of serpentine structures, flexible temperature and angle sensors were designed that can be attached to the surface of an object or the human body for monitoring purposes. In these sensors, changes in temperature and bending angle are converted into variations in resistance through thermal resistance and strain effects with a sensitivity of 0.00204/°C for temperatures in the range of 25 to 100 °C and a sensitivity of 0.00015/° for bending angles in the range of 0° to 150°. With an appropriate layout design, two sensors were integrated to measure temperature and bending angles simultaneously in order to obtain decoupled, compensated, and more accurate information of temperature and angle. Finally, the system was tested by being attached to the surface of a knee joint, demonstrating its application potential in disease diagnosis, such as in arthritis assessment.
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19
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Hozumi S, Honda S, Arie T, Akita S, Takei K. Multimodal Wearable Sensor Sheet for Health-Related Chemical and Physical Monitoring. ACS Sens 2021; 6:1918-1924. [PMID: 33876933 DOI: 10.1021/acssensors.1c00281] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Continuous multiple data health monitoring has high potential to detect abnormal conditions or early stages of diseases in the future. To monitor a continuous small vital signal, one of the promising architectures is an attachable flexible multimodal sensor system, which can detect multiple health conditions from the skin surface. Recent breakthroughs have realized continuous sweat chemicals or physical conditions using flexible sensors. However, multimodal sensor integration to monitor chemical and physical information simultaneously and precisely is still a challenge. In this study, we present a multimodal wearable sensor sheet, which allows us to monitor sweat glucose, electrocardiograms, and skin temperature. Furthermore, to prevent the accumulation of glucose on the sensor surface for precise monitoring, a fluidic channel is also integrated to refresh the sweat from the sensor surface, resulting in the precise measurement of chemical substances in real time. This multimodal and flexible sensor platform takes a significant step toward realizing wearable healthcare applications to diagnose the early stages of diseases in advance.
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Affiliation(s)
- Shota Hozumi
- Deparment of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Satoko Honda
- Deparment of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Takayuki Arie
- Deparment of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Seiji Akita
- Deparment of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Kuniharu Takei
- Deparment of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
- JST PRESTO, Kawaguchi, Saitama 332-0012, Japan
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20
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Chai Y, Chen C, Luo X, Zhan S, Kim J, Luo J, Wang X, Hu Z, Ying Y, Liu X. Cohabiting Plant-Wearable Sensor In Situ Monitors Water Transport in Plant. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2003642. [PMID: 34026443 PMCID: PMC8132156 DOI: 10.1002/advs.202003642] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 01/03/2021] [Indexed: 06/01/2023]
Abstract
The boom of plant phenotype highlights the need to measure the physiological characteristics of an individual plant. However, continuous real-time monitoring of a plant's internal physiological status remains challenging using traditional silicon-based sensor technology, due to the fundamental mismatch between rigid sensors and soft and curved plant surfaces. Here, the first flexible electronic sensing device is reported that can harmlessly cohabitate with the plant and continuously monitor its stem sap flow, a critical plant physiological characteristic for analyzing plant health, water consumption, and nutrient distribution. Due to a special design and the materials chosen, the realized plant-wearable sensor is thin, soft, lightweight, air/water/light-permeable, and shows excellent biocompatibility, therefore enabling the sap flow detection in a continuous and non-destructive manner. The sensor can serve as a noninvasive, high-throughput, low-cost toolbox, and holds excellent potentials in phenotyping. Furthermore, the real-time investigation on stem flow insides watermelon reveals a previously unknown day/night shift pattern of water allocation between fruit and its adjacent branch, which has not been reported before.
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Affiliation(s)
- Yangfan Chai
- College of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou310058China
| | - Chuyi Chen
- College of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou310058China
| | - Xuan Luo
- College of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou310058China
| | - Shijie Zhan
- Department of EngineeringUniversity of CambridgeCambridgeCB3 0FFUK
| | - Jongmin Kim
- Department of EngineeringUniversity of CambridgeCambridgeCB3 0FFUK
| | - Jikui Luo
- College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou310058China
| | - Xiaozhi Wang
- College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou310058China
| | - Zhongyuan Hu
- College of Agriculture and BiotechnologyZhejiang UniversityHangzhou310058China
| | - Yibin Ying
- College of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou310058China
| | - Xiangjiang Liu
- College of Biosystems Engineering and Food ScienceZhejiang UniversityHangzhou310058China
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21
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Xu K, Fujita Y, Lu Y, Honda S, Shiomi M, Arie T, Akita S, Takei K. A Wearable Body Condition Sensor System with Wireless Feedback Alarm Functions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2008701. [PMID: 33772894 DOI: 10.1002/adma.202008701] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/30/2021] [Indexed: 05/21/2023]
Abstract
Emerging feedback systems based on tracking body conditions can save human lives. In particular, vulnerable populations such as disabled people, elderly, and infants often require special care. For example, the high global mortality of infants primarily owing to sudden infant death syndrome while sleeping makes request for extraordinary attentions in neonatal intensive care units or daily lives. Here, a versatile laser-induced graphene (LIG)-based integrated flexible sensor system, which can wirelessly monitor the sleeping postures, respiration rate, and diaper moisture with feedback alarm notifications, is reported. A tilt sensor based on confining a liquid metal droplet inside a cavity can track at least 18 slanting orientations. A rapid and scalable laser direct writing method realizes LIG patterning in both the in-plane and out-of-plane configurations as well as the formation of nonstick conductive structures to the liquid metal. By rationally merging the LIG-based tilt, strain, and humidity sensors on a thin flexible film, the multimodal sensor device is applied to a diaper as a real-time feedback tracking system of the sleeping posture, respiration, and wetness toward secure and comfortable lives. User-friendly interfaces, which incorporate alarming functions, provide timely feedback for caregivers tending to vulnerable populations with limited self-care capabilities.
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Affiliation(s)
- Kaichen Xu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Yusuke Fujita
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Yuyao Lu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Satoko Honda
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Mao Shiomi
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Takayuki Arie
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Seiji Akita
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Kuniharu Takei
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
- JST PRESTO, Kawaguchi, Saitama, 332-0012, Japan
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22
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Lu Y, Xu K, Yang MQ, Tang SY, Yang TY, Fujita Y, Honda S, Arie T, Akita S, Chueh YL, Takei K. Highly stable Pd/HNb 3O 8-based flexible humidity sensor for perdurable wireless wearable applications. NANOSCALE HORIZONS 2021; 6:260-270. [PMID: 33470262 DOI: 10.1039/d0nh00594k] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Real-time, daily health monitoring can provide large amounts of patient data, which may greatly improve the likelihood of diagnosing health conditions at an early stage. One potential sensor is a flexible humidity sensor to monitor moisture and humidity information such as dehydration. However, achieving a durable functional nanomaterial-based flexible humidity sensor remains a challenge due to partial desorption of water molecules during the recovery process, especially at high humidities. In this work, we demonstrate a highly stable resistive-type Pd/HNb3O8 humidity sensor, which exhibits a perdurable performance for over 100 h of cycle tests under a 90% relative humidity (RH) without significant performance degradation. One notable advantage of the Pd/HNb3O8 humidity sensor is its ability to regulate hydroniums due to the strong reducibility of H atoms dissociated on the Pd surface. This feature realizes a high stability even at a high humidity (99.9% RH). Using this superior performance, the Pd/HNb3O8 humidity sensor realizes wireless monitoring of the changes in the fingertip humidity of an adult under different physiological states, demonstrating a facile and reliable path for dehydration diagnosis.
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Affiliation(s)
- Yuyao Lu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
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23
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Wang B, Li G, Xu L, Liao J, Zhang X. Nanoporous Boron Nitride Aerogel Film and Its Smart Composite with Phase Change Materials. ACS NANO 2020; 14:16590-16599. [PMID: 33044057 DOI: 10.1021/acsnano.0c05931] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
With the advent of the 5G era, electronic systems have become more and more powerful, miniaturized, integrated ,and intelligent. The thermal management of electronic systems requires more efficiency and multiple functions for their practical applications, especially for the portable 5G electronic devices of the future, as the undesired heat can cause thermal discomfort or even thermal injury to people who use these electronic devices. Herein, two thermal management strategies based on boron nitride (BN) aerogel films have been proposed and demonstrated for portable devices. First, a flexible BN aerogel film with high porosity (>96%), large specific surface area (up to 982 m2 g-1), and controllable thickness (in the range from 50 to 200 μm) was fabricated via molecular precursor assembly, sublimation drying, and pyrolysis reaction in sequence. The resulting BN aerogel film individuals, serving as a thermal insulation protecting layer in portable electronics, can significantly reduce heat transfer from electronics to skin. Second, BN phase change composite films, made by dipping BN aerogel films into the melts of the organic phase change materials (e.g., paraffin), can effectively cool the portable electronics as the organic phase change materials filled in the aerogel matrix can serve as a smart thermal-regulator to absorb the undesired heat via solid-liquid phase transition. These two typical strategies of the flexible BN aerogel film-directed thermal management could assist in efforts to miniaturize, integrate, and intelligentialize portable 5G electronic devices in the future.
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Affiliation(s)
- Bolong Wang
- School of Materials Science and Engineering, Hainan University, 58 Renmin Avenue, Haikou 570228, P.R. China
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P.R. China
| | - Guangyong Li
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P.R. China
| | - Liang Xu
- Nanjing Engineering Institute of Aircraft Systems, AVIC/Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing 211102, P.R. China
| | - Jianhe Liao
- School of Materials Science and Engineering, Hainan University, 58 Renmin Avenue, Haikou 570228, P.R. China
| | - Xuetong Zhang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P.R. China
- Division of Surgery & Interventional Science, University College London, London NW3 2PF, U.K
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24
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Liu Y, Chen S, Fu Y, Wang N, Mencarelli D, Pierantoni L, Lu H, Liu J. A lightweight and high thermal performance graphene heat pipe. NANO SELECT 2020. [DOI: 10.1002/nano.202000195] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Ya Liu
- Electronics Materials and Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Kemivägen 9 Gothenburg 41296 Sweden
- State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Collaborative Innovation Center of Polymers and Polymer Composites Fudan University Songhu Road 2005 Shanghai 200433 China
| | - Shujing Chen
- SMIT Center, Department of Mechanical Engineering and Automation Shanghai University Chengzhong Road 20 Shanghai 201800 China
| | - Yifeng Fu
- Electronics Materials and Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Kemivägen 9 Gothenburg 41296 Sweden
| | - Nan Wang
- SHT Smart High Tech‐AB Kemivägen 6 Gothenburg 41258 Sweden
| | | | - Luca Pierantoni
- Marche Polytechnic University Via Brecce Bianche Ancona 60131 Italy
| | - Hongbin Lu
- State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Collaborative Innovation Center of Polymers and Polymer Composites Fudan University Songhu Road 2005 Shanghai 200433 China
| | - Johan Liu
- Electronics Materials and Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Kemivägen 9 Gothenburg 41296 Sweden
- SMIT Center, Department of Mechanical Engineering and Automation Shanghai University Chengzhong Road 20 Shanghai 201800 China
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25
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Lu Y, Xu K, Zhang L, Deguchi M, Shishido H, Arie T, Pan R, Hayashi A, Shen L, Akita S, Takei K. Multimodal Plant Healthcare Flexible Sensor System. ACS NANO 2020; 14:10966-10975. [PMID: 32806070 DOI: 10.1021/acsnano.0c03757] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The rising global human population and increased environmental stresses require a higher plant productivity while balancing the ecosystem using advanced nanoelectronic technologies. Although multifunctional wearable devices have played distinct roles in human healthcare monitoring and disease diagnosis, probing potential physiological health issues in plants poses a formidable challenge due to their biological complexity. Herein an integrated multimodal flexible sensor system is proposed for plant growth management using stacked ZnIn2S4(ZIS) nanosheets as the kernel sensing media. The proposed ZIS-based flexible sensor can not only perceive light illumination at a fast response (∼4 ms) but also monitor the humidity with a perdurable steady performance that has yet to be reported elsewhere. First-principles calculations reveal that the tunneling effect dominates the current model associated with humidity response. This finding guides the investigation on the plant stomatal functions by measuring plant transpiration. Significantly, dehydration conditions are visually recorded during a monitoring period (>15 days). This work may contribute to plant-machine biointerfaces to precisely manage plant health status and judiciously utilize limited resources.
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Affiliation(s)
- Yuyao Lu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Kaichen Xu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Lishu Zhang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, People's Republic of China
| | - Minako Deguchi
- Department of Applied Chemistry, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Hiroaki Shishido
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Takayuki Arie
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Ruihua Pan
- School of Ecology and Environment, Inner Mongolia University, Inner Mongolia 010021, China
| | - Akitoshi Hayashi
- Department of Applied Chemistry, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Lei Shen
- Department of Mechanical Engineering, National University of Singapore, Singapore 117542, Singapore
| | - Seiji Akita
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Kuniharu Takei
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
- JST PRESTO, Kawaguchi, Saitama 332-0012, Japan
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26
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Al-Qatatsheh A, Morsi Y, Zavabeti A, Zolfagharian A, Salim N, Z. Kouzani A, Mosadegh B, Gharaie S. Blood Pressure Sensors: Materials, Fabrication Methods, Performance Evaluations and Future Perspectives. SENSORS (BASEL, SWITZERLAND) 2020; 20:E4484. [PMID: 32796604 PMCID: PMC7474433 DOI: 10.3390/s20164484] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 12/14/2022]
Abstract
Advancements in materials science and fabrication techniques have contributed to the significant growing attention to a wide variety of sensors for digital healthcare. While the progress in this area is tremendously impressive, few wearable sensors with the capability of real-time blood pressure monitoring are approved for clinical use. One of the key obstacles in the further development of wearable sensors for medical applications is the lack of comprehensive technical evaluation of sensor materials against the expected clinical performance. Here, we present an extensive review and critical analysis of various materials applied in the design and fabrication of wearable sensors. In our unique transdisciplinary approach, we studied the fundamentals of blood pressure and examined its measuring modalities while focusing on their clinical use and sensing principles to identify material functionalities. Then, we carefully reviewed various categories of functional materials utilized in sensor building blocks allowing for comparative analysis of the performance of a wide range of materials throughout the sensor operational-life cycle. Not only this provides essential data to enhance the materials' properties and optimize their performance, but also, it highlights new perspectives and provides suggestions to develop the next generation pressure sensors for clinical use.
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Affiliation(s)
- Ahmed Al-Qatatsheh
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Yosry Morsi
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Ali Zavabeti
- Department of Chemical Engineering, The University of Melbourne, Parkville VIC 3010, Australia;
| | - Ali Zolfagharian
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
| | - Nisa Salim
- Faculty of Science, Engineering, and Technology (FSET), Swinburne University of Technology, Melbourne VIC 3122, Australia; (Y.M.); (N.S.)
| | - Abbas Z. Kouzani
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
| | - Bobak Mosadegh
- Dalio Institute of Cardiovascular Imaging, Weill Cornell Medicine, New York, NY 10065, USA;
| | - Saleh Gharaie
- Faculty of Science, Engineering and Built Environment, School of Engineering, Deakin University, Waurn Ponds VIC 3216, Australia; (A.Z.); (A.Z.K.)
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27
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Li X, Ling SH, Su S. A Hybrid Feature Selection and Extraction Methods for Sleep Apnea Detection Using Bio-Signals. SENSORS 2020; 20:s20154323. [PMID: 32756353 PMCID: PMC7436101 DOI: 10.3390/s20154323] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/06/2020] [Accepted: 07/31/2020] [Indexed: 11/16/2022]
Abstract
People with sleep apnea (SA) are at increased risk of having stroke and cardiovascular diseases. Polysomnography (PSG) is used to detect SA. This paper conducts feature selection from PSG signals and uses a support vector machine (SVM) to detect SA. To analyze SA, the Physionet Apnea Database was used to obtain various features. Electrocardiography (ECG), oxygen saturation (SaO2), airflow, abdominal, and thoracic signals were used to provide various frequency-, time-domain and non-linear features (n = 87). To analyse the significance of these features, firstly, two evaluation measures, the rank-sum method and the analysis of variance (ANOVA) were used to evaluate the significance of the features. These features were then classified according to their significance. Finally, different class feature sets were presented as inputs for an SVM classifier to detect the onset of SA. The hill-climbing feature selection algorithm and the k-fold cross-validation method were applied to evaluate each classification performance. Through the experiments, we discovered that the best feature set (including the top-five significant features) obtained the best classification performance. Furthermore, we plotted receiver operating characteristic (ROC) curves to examine the performance of the SVM, and the results showed the SVM with Linear kernel (regularization parameter = 1) outperformed other classifiers (area under curve = 95.23%, sensitivity = 94.29%, specificity = 96.17%). The results confirm that feature subsets based on multiple bio-signals have the potential to identify patients with SA. The use of a smaller subset avoids dimensionality problems and reduces the computational load.
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Wakabayashi S, Arie T, Akita S, Takei K. Very Thin, Macroscale, Flexible, Tactile Pressure Sensor Sheet. ACS OMEGA 2020; 5:17721-17725. [PMID: 32715259 PMCID: PMC7377324 DOI: 10.1021/acsomega.0c02337] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 06/25/2020] [Indexed: 06/01/2023]
Abstract
In artificial intelligence and deep learning applications, data collection from a variety of objects is of great interest. One way to support such data collection is to use very thin, mechanically flexible sensor sheets, which can cover an object without altering the original shape. This study proposes a thin, macroscale, flexible, tactile pressure sensor array fabricated by a simple process for economical device applications. Using laser-induced graphene, a transfer process, and a printing method, a relatively stable, reliable, macroscale, thin (∼300 μm), flexible, tactile pressure sensor is realized. The detectable pressure range is about tens to hundreds of kPa. Then, as a proof-of-concept, the uniformity, sensitivity, repeatability, object mapping, finger pressure distribution, and pressure mapping are demonstrated under bending conditions. Although many flexible, tactile pressure sensors have been reported, the proposed structure has the potential for macroscale, thin, flexible, tactile pressure sensor sheets because of the simple and easy fabrication process.
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Affiliation(s)
- Seiji Wakabayashi
- Department
of Physics and Electronics, Osaka Prefecture
University, Sakai, Osaka 599-8531, Japan
| | - Takayuki Arie
- Department
of Physics and Electronics, Osaka Prefecture
University, Sakai, Osaka 599-8531, Japan
| | - Seiji Akita
- Department
of Physics and Electronics, Osaka Prefecture
University, Sakai, Osaka 599-8531, Japan
| | - Kuniharu Takei
- Department
of Physics and Electronics, Osaka Prefecture
University, Sakai, Osaka 599-8531, Japan
- JST
PRESTO, Kawaguchi, Saitama 332-0012, Japan
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29
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Xiang L, Zeng X, Xia F, Jin W, Liu Y, Hu Y. Recent Advances in Flexible and Stretchable Sensing Systems: From the Perspective of System Integration. ACS NANO 2020; 14:6449-6469. [PMID: 32479071 DOI: 10.1021/acsnano.0c01164] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Biological signals generated during various biological processes are critically important for providing insight into the human physiological status. Recently, there have been many great efforts in developing flexible and stretchable sensing systems to provide biological signal monitoring platforms with intimate integration with biological surfaces. Here, this review summarizes the recent advances in flexible and stretchable sensing systems from the perspective of electronic system integration. A comprehensive general sensing system architecture is described, which consists of sensors, sensor interface circuits, memories, and digital processing units. The subsequent content focuses on the integration requirements and highlights some advanced progress for each component. Next, representative examples of flexible and stretchable sensing systems for electrophysiological, physical, and chemical information monitoring are introduced. This review concludes with an outlook on the remaining challenges and opportunities for future fully flexible or stretchable sensing systems.
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Affiliation(s)
- Li Xiang
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
| | - Xiangwen Zeng
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
| | - Fan Xia
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Wanlin Jin
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
| | - Youdi Liu
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
| | - Youfan Hu
- Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Carbon-Based Electronics, Frontiers Science Center for Nano-optoelectronics, and Department of Electronics, Peking University, Beijing 100871, China
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
- Hunan Institute of Advanced Sensing and Information Technology, Xiangtan University, Hunan 411105, China
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30
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Development of a Strain Sensor Matrix on Mobilized Flexible Substrate for the Imaging of Wind Pressure Distribution. MICROMACHINES 2020; 11:mi11020232. [PMID: 32102376 PMCID: PMC7074717 DOI: 10.3390/mi11020232] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/21/2020] [Accepted: 02/22/2020] [Indexed: 11/16/2022]
Abstract
This paper presents a novel flexible sensor for monitoring wind pressure distribution. Based on the concept of "flexible mechatronics", a suspended structure was incorporated into the matrix of a resistive-strain sensor in a plastic film to make the sensor mechanically movable against the wind. Screen printing and laser cutting were confirmed to be satisfactory methods for fabricating the proposed device structure. As a result, the visualization of wind pressure was successfully demonstrated by the fabricated sensor sheet and an imaging-display-creation software. The results of this study show that a mechanically functionalized substrate opens up new avenues for flexible electronics.
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31
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Yang K, Zong S, Zhang Y, Qian Z, Liu Y, Zhu K, Li L, Li N, Wang Z, Cui Y. Array-Assisted SERS Microfluidic Chips for Highly Sensitive and Multiplex Gas Sensing. ACS APPLIED MATERIALS & INTERFACES 2020; 12:1395-1403. [PMID: 31820638 DOI: 10.1021/acsami.9b19358] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A novel kind of array-assisted surface-enhanced Raman spectroscopy (SERS) microfluidic chip (ArraySERS chip) is demonstrated for gas sensing, which has the advantages of both ultrahigh sensitivity and multiplex sensing ability. On the one hand, the introduction of a microstructured triangular array can greatly increase the multiple collision probability between gas molecules and sensing interfaces in the channel. Compared with traditional gas sensors using sealed boxes, where gaseous molecules move only by diffusion, the ArraySERS chip exhibits significantly improved sensitivity. On the other hand, a composite nanoparticle is fabricated as a SERS probe for reading out the fingerprint spectral data, which consists of metal-organic framework (MOF) materials [Zeolitic Imidazolate framework-8 (ZIF-8)] and Au@Ag nanocubes, as well as cysteamine (CA) that serves as the gas-capturing agent. The experimental results show that such a structure of the SERS probe can further increase the sensing ability because of better adsorption of ZIF-8 for gas and the lower SERS background of CA itself. In addition, the simultaneous detection of multiplex gases was easily performed according to their own intrinsic SERS signals. Taking aldehyde gas as a model of a typical air pollutant, trace and multicomponent detection was realized using the ArraySERS chip. The limit of detection value was as low as 1 ppb, which is 2 magnitudes lower than that obtained by traditional methods. This strategy can be well extended for the detection of universal gases and help unleash the potential of existing gas sensors, especially for samples at low concentrations in air.
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Affiliation(s)
- Kuo Yang
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Shenfei Zong
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Yizhi Zhang
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Ziting Qian
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Yun Liu
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Kai Zhu
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Lang Li
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Na Li
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Zhuyuan Wang
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
| | - Yiping Cui
- Advanced Photonics Center , Southeast University , Nanjing 210096 , China
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32
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Yamaguchi T, Yamamoto D, Arie T, Akita S, Takei K. Wrist flexible heart pulse sensor integrated with a soft pump and a pneumatic balloon membrane. RSC Adv 2020; 10:17353-17358. [PMID: 35521472 PMCID: PMC9057701 DOI: 10.1039/d0ra02316g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 04/24/2020] [Indexed: 11/21/2022] Open
Abstract
To monitor health and diagnose disease in the early stage, future healthcare standards will likely include the continuous monitoring of various vital data. One approach to collect such information is a wearable and flexible device, which detects information from the skin surface. An important dataset is heart pulse information. Herein a method to monitor the detailed pulse signal from a wrist stably and reliably is proposed. Specifically, a soft pneumatic balloon operated by a soft pump applies the appropriate pressure over a tactile sensor onto the radial artery of the wrist to detect detailed heart pulse waves. The soft pump, pneumatic balloon, and flexible tactile pressure sensor are characterized as a fundamental study. Additionally, a proof-of-concept of this integrated device platform is demonstrated by monitoring the heart pulse from a wrist with and without the soft pump functions. Wearable and flexible heart pulse sensor is proposed to monitor the detailed pulse signal from a wrist stably and reliably by integrating a tactile pressure sensor and a soft pneumatic balloon operated by a soft pump.![]()
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Affiliation(s)
- Takafumi Yamaguchi
- Department of Physics and Electronics
- Osaka Prefecture University
- Sakai
- Japan
| | - Daisuke Yamamoto
- Department of Physics and Electronics
- Osaka Prefecture University
- Sakai
- Japan
| | - Takayuki Arie
- Department of Physics and Electronics
- Osaka Prefecture University
- Sakai
- Japan
| | - Seiji Akita
- Department of Physics and Electronics
- Osaka Prefecture University
- Sakai
- Japan
| | - Kuniharu Takei
- Department of Physics and Electronics
- Osaka Prefecture University
- Sakai
- Japan
- Japan Science and Technology
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