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Wang W, Ma Y, Wang T, Ding K, Zhao W, Jiao L, Shu D, Li C, Hua F, Jiang H, Tong S, Yang S, Ni Y, Cheng B. Double-Layered Conductive Network Design of Flexible Strain Sensors for High Sensitivity and Wide Working Range. ACS APPLIED MATERIALS & INTERFACES 2022; 14:36611-36621. [PMID: 35926517 DOI: 10.1021/acsami.2c08285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
For flexible strain sensors, the optimization between sensitivity and working range is a significant challenge due to the fact that high sensitivity and high working range are usually difficult to obtain at the same time. Herein, a breathable flexible strain sensor with a double-layered conductive network structure was designed and developed, which consists of a thermoplastic polyurethane (TPU)/carbon nanotube (CNT) layer (as a substrate layer) and a Ag nanowire (AgNW) layer. The TPU/CNT layer is made of electrospinning TPU with CNTs deposited onto the surface of TPU fibers, and the flexible TPU/CNT mat guarantees the integrity of the conductive path under a large strain. The AgNW layer was prepared by depositing different amounts of AgNWs on the surface of the TPU/CNT layer, and the high-conductivity AgNWs offer a low initial resistance. Benefitting from the synergistic two-layer structure, the as-obtained flexible strain sensor exhibits a very high sensitivity (up to 1477.7) and a very wide working range (up to 150%). Besides, the fabricated sensor exhibits fast response (88 ms), excellent dynamical stability (7000 cycles), and excellent breathability. The working mechanism of the strain sensor was further investigated using various techniques (microscopy, equivalent circuit, and thermal effects of current). Furthermore, the as-fabricated flexible strain sensors accurately detect the omnidirectional human motions, including subtle and large human motions. This work provides an efficient approach to achieve the optimization between high sensitivity and large working range of strain sensors, which may have great potential applications in health monitoring, body motion detection, and human-machine interactions.
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Affiliation(s)
- Wei Wang
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Yuying Ma
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Tianyi Wang
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Kai Ding
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Wei Zhao
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Long Jiao
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Dengkun Shu
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Chenyang Li
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
| | - Feiguo Hua
- Zhejiang Jinjiahao Green Nanomaterial Co., Ltd., Longyou 324404, China
- Zhejiang Jinchang Specialty Paper Co., Ltd., Longyou 324404, China
| | - Hong Jiang
- Jiangxi Changshuo Outdoor Leisured Articles Co.,Ltd, Shangrao 334000, China
| | - Shuhua Tong
- Zhejiang Jinchang Specialty Paper Co., Ltd., Longyou 324404, China
| | - Shuo Yang
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
- Zhejiang Jinchang Specialty Paper Co., Ltd., Longyou 324404, China
| | - Yonghao Ni
- Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
| | - Bowen Cheng
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China
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Wang H, Zhou R, Li D, Zhang L, Ren G, Wang L, Liu J, Wang D, Tang Z, Lu G, Sun G, Yu HD, Huang W. High-Performance Foam-Shaped Strain Sensor Based on Carbon Nanotubes and Ti 3C 2T x MXene for the Monitoring of Human Activities. ACS NANO 2021; 15:9690-9700. [PMID: 34086439 DOI: 10.1021/acsnano.1c00259] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The flexible strain sensor is of significant importance in wearable electronics, since it can help monitor the physical signals from the human body. Among various strain sensors, the foam-shaped ones have received widespread attention owing to their light weight and gas permeability. However, the working range of these sensors is still not large enough, and the sensitivity needs to be further improved. In this work, we develop a high-performance foam-shaped strain sensor composed of Ti3C2Tx MXene, multiwalled carbon nanotubes (MWCNTs), and thermoplastic polyurethane (TPU). MXene sheets are adsorbed on the surface of a composite foam of MWCNTs and TPU (referred to as TPU/MWCNTs foam), which is prefabricated by using a salt-templating method. The obtained TPU/MWCNTs@MXene foam works effectively as a lightweight, easily processable, and sensitive strain sensor. The TPU/MWCNTs@MXene device can deliver a wide working strain range of ∼100% and an outstanding sensitivity as high as 363 simultaneously, superior to the state-of-the-art foam-shaped strain sensors. Moreover, the composite foam shows an excellent gas permeability and suitable elastic modulus close to those of skin, indicating its being highly comfortable as a wearable sensor. Owing to these advantages, the sensor works effectively in detecting both subtle and large human movements, such as joint motion, finger motion, and vocal cord vibration. In addition, the sensor can be used for gesture recognition, demonstrating its perspective in human-machine interaction. Because of the high sensitivity, wide working range, gas permeability, and suitable modulus, our foam-shaped composite strain sensor may have great potential in the field of flexible and wearable electronics in the near future.
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Affiliation(s)
- Hongchen Wang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Ruicong Zhou
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Donghai Li
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Linrong Zhang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Guozhang Ren
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Li Wang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Jinhua Liu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Deyang Wang
- College of Aerospace Engineering, Chongqing University, 174 Shazhengjie Road, Chongqing 400044, P. R. China
| | - Zhenhua Tang
- College of Aerospace Engineering, Chongqing University, 174 Shazhengjie Road, Chongqing 400044, P. R. China
| | - Gang Lu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Gengzhi Sun
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, P. R. China
| | - Hai-Dong Yu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, P. R. China
| | - Wei Huang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLoFE), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, P. R. China
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, P. R. China
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Koken ZO, Yalcin YC, van Netten D, de Bakker CC, van der Graaf M, Kervan U, Verkaik NJ, Caliskan K. Driveline exit-site care protocols in patients with left ventricular assist devices: a systematic review. Eur J Cardiothorac Surg 2021; 60:506-515. [PMID: 33963835 PMCID: PMC8434872 DOI: 10.1093/ejcts/ezab195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 02/14/2021] [Accepted: 02/17/2021] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Driveline infections continue to be a significant complication following left ventricular assist device (LVAD) implantation. Driveline exit-site care is crucial for the prevention of infections; however, there are no uniform guidelines. The goal of this study was to provide an overview of the currently published driveline exit-site care protocols in patients with LVAD. METHODS A systematic literature review was performed. Studies before 15 December 2020 were included if the number of driveline infections was a primary outcome and the driveline exit-site care protocol was explained. RESULTS Eleven articles were included in the systematic review, including 1602 patients with LVADs. The median of the frequency of driveline infections in the articles was 13.8% with a range of 0–52.6%. There was a marked variability in the methods of care of driveline exit sites, without a standardized driveline dressing technique in patients with LVADs. The frequency of driveline infections was 6–7.5% in studies using a dressing kit that included chlorhexidine, a silver-based dressing and an anchoring device. Furthermore, there was variability in the anchoring devices and the frequency of dressing changes, which varied from daily to weekly. No specific anchoring device or change frequency was found to be superior. CONCLUSIONS Based on this systematic review, driveline exit care protocols that included chlorhexidine, a silver-based dressing, the use of an anchoring device and dressing kits might be best in reducing driveline infection rates. However, prospective studies with larger cohorts are needed to establish the optimal protocol for driveline exit-site care.
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Affiliation(s)
- Zeliha Ozdemir Koken
- Department of Cardiology, Unit of Heart Failure, Heart Transplantation and Mechanical Circulatory Support, Erasmus University Medical Center, Rotterdam, Netherlands.,Surgical Nursing Department, Faculty of Nursing, Hacettepe University, Ankara, Turkey
| | - Yunus C Yalcin
- Department of Cardiology, Unit of Heart Failure, Heart Transplantation and Mechanical Circulatory Support, Erasmus University Medical Center, Rotterdam, Netherlands.,Department of Cardio-thoracic Surgery, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Diana van Netten
- Department of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Chantal C de Bakker
- Department of Cardiology, Unit of Heart Failure, Heart Transplantation and Mechanical Circulatory Support, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Maaike van der Graaf
- Department of Cardiology, Unit of Heart Failure, Heart Transplantation and Mechanical Circulatory Support, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Umit Kervan
- Department of Cardiovascular Surgery, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Nelianne J Verkaik
- Department of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Kadir Caliskan
- Department of Cardiology, Unit of Heart Failure, Heart Transplantation and Mechanical Circulatory Support, Erasmus University Medical Center, Rotterdam, Netherlands
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S. S, A. SK, Nair PD, Thomas LV. A nonadherent chitosan-polyvinyl alcohol absorbent wound dressing prepared via controlled freeze-dry technology. Int J Biol Macromol 2020; 150:129-140. [DOI: 10.1016/j.ijbiomac.2020.01.292] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 01/29/2020] [Accepted: 01/29/2020] [Indexed: 11/28/2022]
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Namviriyachote N, Lipipun V, Akkhawattanangkul Y, Charoonrut P, Ritthidej GC. Development of polyurethane foam dressing containing silver and asiaticoside for healing of dermal wound. Asian J Pharm Sci 2019; 14:63-77. [PMID: 32104439 PMCID: PMC7032128 DOI: 10.1016/j.ajps.2018.09.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 09/04/2018] [Accepted: 09/21/2018] [Indexed: 11/19/2022] Open
Abstract
Polyurethane foam dressings for dermal wounds were formulated with natural polyols in order to improve the foam characteristics and the release of 2 active agents, silver and asiaticoside (AS) as an antimicrobial agent and an herbal wound healing agent, respectively. The foam was instantly formed by interaction of polyols and diisocyanate. Hydroxypropyl methylcellulose, chitosan and sodium alginate were individually mixed with the main polyols, polypropylene glycol, in the formulation while the active components were impregnated into the obtained foam dressing sheets. Although the type and amount of the natural polyols slightly affected the pore size, water sorption-desorption profile and compression strength of the obtained foam sheets, a prominent effect was found in the release of both active components. Among natural polyols formulations, foam sheets with alginate showed the highest silver and AS release. Non-cytotoxicity of these foam sheets to human fibroblast cells was confirmed. Antimicrobial testing on four bacteria strains showed that 1 mg/cm2 silver in formulations with 6% of natural polyols and without natural polyols had sufficient content of the silver release with comparable inhibition zone and significantly larger zone than other formulations. In pig study, the foam dressing with 6% alginate, 1 mg/cm2 silver and 5% AS could improve wound healing in both the percentage of the wound closure and histological parameters of the dermal wound without any dermatologic reactions. In conclusion, this innovative foam dressing had potential to be a good candidate for wound treatment.
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Affiliation(s)
| | - Vimolmas Lipipun
- Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Phingphol Charoonrut
- Faculty of Veterinary Science, Mahidol University, Nakhon Pathom 73170, Thailand
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Lee SM, Park IK, Kim YS, Kim HJ, Moon H, Mueller S, Arumugam H, Jeong YI. Erratum to: Superior absorption and retention properties of foam-film silver dressing versus other commercially available silver dressing. Biomater Res 2016; 20:38. [PMID: 27980803 PMCID: PMC5139079 DOI: 10.1186/s40824-016-0085-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 11/18/2016] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | | | | | | | | | | | - Young-Il Jeong
- Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 602-739 Republic of Korea
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