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Surface Modification of Electrocatalyst for Optimal Adsorption of Reactants in Oxygen Evolution Reaction. Catalysts 2021. [DOI: 10.3390/catal11060717] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Technological development after the industrial revolution has improved the quality of human life, but global energy consumption continues to increase due to population growth and the development of fossil fuels. Therefore, numerous studies have been conducted to develop sustainable long-term and renewable alternative energy sources. The anodic electrode, which is one of the two-electrode system components, is an essential element for effective energy production. In general, precious metal-based electrocatalysts show high OER reactions from the anodic electrode, but it is difficult to scale up due to their low abundance and high cost. To overcome these problems, transition metal-based anodic electrodes, which exhibit advantages with respect to their low cost and high catalytic activities, are in the spotlight nowadays. Among them, stainless steel is a material with a high ratio of transition metal components, i.e., Fe, Ni, and Cr, and has excellent corrosion resistance and low cost. However, stainless steel shows low electrochemical performance due to its slow sluggish kinetics and lack of active sites. In this study, we fabricated surface modified electrodes by two methods: (i) anodization and (ii) hydrogen peroxide (H2O2) immersion treatments. As a result of comparing the two methods, the change of the electrode surface and the electrochemical properties were not confirmed in the H2O2 immersion method. On the other hand, the porous electrode (PE) fabricated through electrochemical anodization shows a low charge transfer resistance (Rct) and high OER activity due to its large surface area compared to the conventional electrode (CE). These results confirm that the synthesis process of H2O2 immersion is an unsuitable method for surface modification. In contrast, the PE fabricated by anodization can increase the OER activity by providing high adsorption of reactants through surface modification.
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Guidance for Acupuncture Robot with Potentially Utilizing Medical Robotic Technologies. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:8883598. [PMID: 33859714 PMCID: PMC8026281 DOI: 10.1155/2021/8883598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 03/20/2021] [Accepted: 03/23/2021] [Indexed: 11/18/2022]
Abstract
Acupuncture is gaining increasing attention and recognition all over the world. However, a lot of physical labor is paid by acupuncturists. It is natural to resort to a robot which can improve the accuracy as well as the efficacy of therapy. Several teams have separately developed real acupuncture robots or related technologies and even went to the stage of clinical trial and then achieved success commercially. A completed clinical practical acupuncture robot is not far from reach with the combination of existing mature medical robotic technologies. A hand-eye-brain coordination framework is proposed in this review to integrate the potential utilizing technologies including force feedback, binocular vision, and automatic prescription. We should take acupuncture prescription with artificial intelligence and future development trends into account and make a feasible choice in development of modern acupuncture.
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Kim HS, Choi H, Flores MC, Razzaq A, Gwak YS, Ahn D, Kim MS, Gurel O, Lee BH, In SI. Noble metal sensitized invasive porous bioelectrodes: advanced medical device for enhanced neuronal activity and chronic alcohol treatment. RSC Adv 2020; 10:43514-43522. [PMID: 35519706 PMCID: PMC9058419 DOI: 10.1039/d0ra07922g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 11/24/2020] [Indexed: 12/16/2022] Open
Abstract
Invasive bioelectrodes are widely used as an effective treatment for several acute and chronic diseases. In earlier work using high surface area invasive porous bioelectrodes evaluated in an animal model of alcoholism withdrawal, we demonstrated significantly improved electrophysiological and behavioral responses. In this study, we further modify the surface of these invasive porous bioelectrodes with noble metal (Ag, Au, Pt) nanoparticles. Compared to both conventional and porous bioelectrodes, noble metal sensitized invasive porous bioelectrodes show markedly increased low threshold (LT) and wide dynamic range (WDR) neuronal activity. In particular, Pt-sensitized invasive porous bioelectrodes show the highest WDR neuronal activity only upon insertion. In addition, Ag-sensitized invasive porous bioelectrodes, whose surface area is about 37 times greater than that of conventional bioelectrodes, show improved electrochemical properties with higher LT and WDR neuronal activity when stimulated. In an animal model of chronic alcoholism, using normal and alcohol-treated Sprague-Dawley (SD) rats evaluated with the elevated plus maze (EPM) test, the Ag-sensitized invasive porous bioelectrodes show about 20% higher open arms time. These results suggest that these noble metal-sensitized invasive bioelectrodes may offer improved therapeutic outcomes for the treatment of chronic alcoholism, and given these enhanced electrophysiological properties, for other conditions as well.
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Affiliation(s)
- Hong Soo Kim
- Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST) 333 Techno Jungang-daero, Hyeonpung-eup Dalseong-gun Daegu 42988 Republic of Korea
| | - Hansaem Choi
- Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST) 333 Techno Jungang-daero, Hyeonpung-eup Dalseong-gun Daegu 42988 Republic of Korea
| | - Monica Claire Flores
- Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST) 333 Techno Jungang-daero, Hyeonpung-eup Dalseong-gun Daegu 42988 Republic of Korea
| | - Abdul Razzaq
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus 1.5 km Defence Road, Off Raiwind Road Lahore 54000 Pakistan
| | - Young Seob Gwak
- Department of Physiology, College of Korean Medicine, Daegu Haany University 136 Sincheondong-ro, Suseong-gu Daegu 42158 Republic of Korea
| | - Danbi Ahn
- Department of Physiology, College of Korean Medicine, Daegu Haany University 136 Sincheondong-ro, Suseong-gu Daegu 42158 Republic of Korea
| | - Mi Seon Kim
- Clinical Trials Management Division, Pharmaceutical Safety Bureau, Ministry of Food and Drug Safety Cheongju-si Chungcheongbuk-do Republic of Korea
| | - Ogan Gurel
- College of Transdisciplinary Studies, Daegu Gyeongbuk Institute of Science & Technology (DGIST) 333 Techno Jungang-daero, Hyeonpung-eup Dalseong-gun Daegu 42988 Republic of Korea
| | - Bong Hyo Lee
- Department of Acupuncture, Moxibustion, and Acupoint, College of Korean Medicine, Daegu Haany University 136 Sincheondong-ro, Suseong-gu Daegu 42158 Republic of Korea
| | - Su-Il In
- Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST) 333 Techno Jungang-daero, Hyeonpung-eup Dalseong-gun Daegu 42988 Republic of Korea
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Vieira D, McEachern F, Filippelli R, Dimentberg E, Harvey EJ, Merle G. Microelectrochemical Smart Needle for Real Time Minimally Invasive Oximetry. BIOSENSORS 2020; 10:E157. [PMID: 33138031 PMCID: PMC7693384 DOI: 10.3390/bios10110157] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/21/2020] [Accepted: 10/27/2020] [Indexed: 12/16/2022]
Abstract
A variety of brain disorders such as neural injury, brain dysfunction, vascular malformation, and neurodegenerative diseases are associated with abnormal levels of oxygen. Current methods to directly monitor tissue oxygenation in the brain are expensive and invasive, suffering from a lack of accuracy. Electrochemical detection has been used as an invasiveness and cost-effectiveness method, minimizing pain, discomfort, and injury to the patient. In this work, we developed a minimally invasive needle-sensor with a high surface area to monitor O2 levels in the brain using acupuncture needles. The approach was to directly etch the iron from stainless steel acupuncture needles via a controlled pitting corrosion process, obtaining a high microporous surface area. In order to increase the conductivity and selectivity, we designed and applied for the first time a low-cost coating process using non-toxic chemicals to deposit high surface area carbon nanoparticle, catalytically active laccase, and biocompatible polypyrrole. The physicochemical properties of the materials were characterized as well as their efficacy and viability as probes for the electrochemical detection of PO2. Our modified needles exhibited efficient electrocatalysis and high selectivity toward O2, with excellent repeatability. We well engineered a small diagnostic tool to monitor PO2, minimally invasive, able to monitor real-time O2 in vivo complex environments.
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Affiliation(s)
- Daniela Vieira
- Experimental Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada; (D.V.); (F.M.); (R.F.); (E.D.)
| | - Francis McEachern
- Experimental Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada; (D.V.); (F.M.); (R.F.); (E.D.)
| | - Romina Filippelli
- Experimental Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada; (D.V.); (F.M.); (R.F.); (E.D.)
| | - Evan Dimentberg
- Experimental Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada; (D.V.); (F.M.); (R.F.); (E.D.)
| | - Edward J Harvey
- Department of Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada;
| | - Geraldine Merle
- Department of Surgery, Faculty of Medicine, McGill University, Montreal, QC H3A 0C5, Canada;
- Chemical Engineering Department, Ecole Polytechnique de Montréal, P.O. Box 6079 Station, Montreal, QC H3C 3A7, Canada
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Bae SJ, Lim J, Lee S, Choi H, Jang JH, Kim YK, Oh JY, Park JH, Jung HS, Chae Y, In SI, Park HJ. Augmented Mechanical Forces of the Surface-Modified Nanoporous Acupuncture Needles Elicit Enhanced Analgesic Effects. Front Neurosci 2019; 13:652. [PMID: 31281240 PMCID: PMC6596406 DOI: 10.3389/fnins.2019.00652] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 06/06/2019] [Indexed: 12/12/2022] Open
Abstract
Over the past several decades, clinical studies have shown significant analgesic effects of acupuncture. The efficacy of acupuncture treatment has improved with the recent development of nanoporous needles (PN), which are produced by modifying the needle surface using nanotechnology. Herein, we showed that PN at acupoint ST36 produces prolonged analgesic effects in an inflammatory pain model; the analgesic effects of PN acupuncture were sustained over 2 h, while those using a conventional needle (CN) lasted only 30 min. In addition, the PN showed greater therapeutic effects than CN after 10 acupuncture treatments once per day for 10 days. We explored how the porous surface of the PN contributes to changes in local tissue, which may in turn result in enhanced analgesic effects. We showed that the PN has greater rotational torque and pulling force than the CN, particularly at acupoints ST36 and LI11, situated on thick muscle layers. Additionally, in ex vivo experiments, the PN showed greater winding of subcutaneous connective tissues and muscle layers. Our results suggest that local mechanical forces are augmented by the PN and its nanoporous surface, contributing to the enhanced and prolonged analgesic effects of PN acupuncture.
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Affiliation(s)
- Sun-Jeong Bae
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Junsik Lim
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Semyung University, Jecheon, South Korea
| | - Sangmin Lee
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Dongguk University, Goyang, South Korea
| | - Hansaem Choi
- Department of Energy Science and Engineering, DGIST, Daegu, South Korea
| | - Jae-Hwan Jang
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Yu-Kang Kim
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Kyung Hee University, Seoul, South Korea.,Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Ju-Young Oh
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Kyung Hee University, Seoul, South Korea.,Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Jeong Hun Park
- Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Hyuk-Sang Jung
- College of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Younbyung Chae
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Kyung Hee University, Seoul, South Korea.,Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
| | - Su-Il In
- Department of Energy Science and Engineering, DGIST, Daegu, South Korea
| | - Hi-Joon Park
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, South Korea.,College of Korean Medicine, Kyung Hee University, Seoul, South Korea.,Graduate School of Korean Medicine, Kyung Hee University, Seoul, South Korea
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