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supersonically sprayed self-aligne d rGO nanosheets and ZnO/ZnMn_(2)O_(4)nanowires for high-energy and high-power-density supercapacitors

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Journal of Materials science & Technology 2023年第6期137卷 193-204页

作者： Chanwoo Park Edmund samuel Byeong-Yeop Kim seongpil An Hae-seok Lee sam s.yoon school of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversityRepublic of Korea sKKU Advanced Institute of Nanotechnology(sAINT)and Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Core-shell-type bimetallic oxide and carbon composites comprising zinc oxide(ZnO)nanospheres and zinc manganese oxide(ZnMn_(2)O_(4))nanowires were produced by a hydrothermal method,and supersoni-cally sprayed together with reduced graphene oxide(rGO)nanosheets onto Ni foil to fabricate flexible *** supersonic impact facilitated the exfoliation of the rGO nanosheets,thereby increasing the surface area and adhesion of the composite particles to the *** rGO nanosheets were vertically aligned during the supersonic impact and formed localized zones,enabling optimal accommodation of the ZnO/ZnMn_(2)O_(4)*** localization,with the addition of rGO,reduced the agglomeration of ZnO/ZnMn_(2)O_(4)*** molar concentration of MnsO_(4)used in the synthesis of ZnO/ZnMn_(2)O_(4)was varied from 0.05 to 0.15 mol/L to determine the optimal MnsO_(4)concentration that would result in the highest energy storage *** unique nanostructure of ZnO/ZnMn_(2)O_(4)and the self-alignment of rGO sheets facilitated a favorable environment for high energy storage capability with a specific capaci-tance of 276.3 mF·cm^(−2)at a current density of 0.5 mA·cm^(−2)and an energy density of 98.2μWh·cm^(−2)at a power density of 1600μW·cm^(−2).The width of the potential window was increased to 1.2 V,imply-ing a significant increase in the energy storage capability of the *** retention of 88%was achieved after 10,000 charge/discharge cycles for the supercapacitor fabricated using an optimal MnsO_(4)concentration(0.10 mol/L)during the composite synthesis.

关键词： ZnO/ZnMn_(2)O_(4)nanowires rGO nanosheets Hydrothermal method supersonic spraying supercapacitor

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Wearable sensors and supercapacitors using electroplated-Ni/ZnO antibacterial fabric

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Journal of Materials science & Technology 2022年第5期100卷 254-264页

作者： Taegun Kim Chanwoo Park Edmund P.samuel Yong-Il Kim seongpil An sam s.yoon school of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea KU-KIsT Green school Korea UniversitySeoul 136-713Republic of Korea sKKU Advanced Institute of Nanotechnology(sAINT)and Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Herein,nickel nanocones and zinc oxide nanosheets were electroplated onto a fabric to produce multifunctional(wearable,stretchable,washable,hydrophobic,and antibacterial)materials with sensing,heating,and supercapacitive *** these functionalities are integrated into a one-layered fabric that can be used as a portable intelligent electronic textile for potential application in healthcare monitoring,smart sportswear,and energy *** nickel enhances the electrical conductivity and thus increases the electron charge transfer for supercapacitor *** integration of ZnO with the Ni-plated fabric provides pseudocapacitance via redox reactions with the *** resistance of the Ni/ZnO fabric changes in response to external stimuli such as temperature and *** voltage is applied,the fabric generates heat through Joule heating,demonstrating its potential application as winter *** superior mechanical durability of the fabric was confirmed through bending and stretching *** hydrophobic surface prevents viruses contained in liquid droplets from infiltrating the *** addition,bacterial growth is inhibited because of the antibacterial properties of the Ni/ZnO fabric and because of Joule *** one-layered fabric integrated with such multiple functionalities is expected to be applicable in the development of next-generation portable and wearable electronic textiles in various industries.

关键词： Multifunctional conductive fabric Fabric supercapacitor Fabric heater Thermal and strain sensors Electroplating

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Wearable heater composites comprising traditional Hanji cellulose fibers coated with graphene,silver nanowires,and PEDOT:Pss via scalable supersonic spraying

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Journal of Materials science & Technology 2023年第33期164卷 27-36页

作者： Woojin Lim Ashwin Khadka Byeong-Yeop Kim Chanwoo Park Ali Aldalbahi Govindasami Periyasami Bhavana Joshi sam s.yoon school of Mechanical Engineering Korea UniversitySeoul 136-713Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Traditional Korean Hanji paper and cotton fabric were introduced as flexible substrates in the fabrication of graphene-coated *** nanowires and PEDOT:Pss were added to increase the electrical conductivity of the heaters,thereby enhancing their heating *** optimal concentrations of silver nanowires and PEDOT:Pss with respect to that of graphene were *** active materials were deposited on flexible Hanji/cotton and non-flexible alumina substrates using supersonic *** proposed Hanji-and cotton-based heaters were light,wearable,stretchable,skin-friendly,and *** unyielding alumina-based heater exhibited the highest heating temperature of 275°C at 13 *** heater bendability and stretchability were tested considering multiple bending and stretching ***,water boiling and fabric drying were successfully performed using the alumina-based *** supersonic spraying deposition technique was used to produce writable and patternable heaters.

关键词： Graphene silver nanowires PEDOT:Pss supersonic spraying Hanji Wearable heater

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Reduced graphene oxide supersonically sprayed on wearable fabric and decorated with iron oxide for supercapacitor applications

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Journal of Materials science & Technology 2021年第23期82卷 47-56页

作者： Ali Aldalbahi Edmund samuel Bander s.Alotaibi Hany El-Hamshary sam s.yoon Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia school of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea

We demonstrate the fabrication of wearable supercapacitor *** electrodes were applied to wearable fabric by supersonically spraying the fabric with reduced graphene oxide(r GO)followed by decoration with iron oxide(Fe_(2)O_(3))nanoparticles via a hydrothermal *** integration of iron oxide with r GO flakes on wearable fabric demonstrates immense potential for applications in high-energystorage *** synergetic impact of the intermingled r GO flakes and Fe_(2)O_(3) nanoparticles enhances the charge transport within the composite electrode,ultimately improving the overall electrochemical *** advantage of the porous nature of the fabric,electrolyte diffusion into the active r GO and Fe_(2)O_(3) materials was significantly enhanced and subsequently increased the electrochemical interfacial *** effect of the Fe_(2)O_(3) concentration on the overall electrochemical performance was *** optimal composition yields a specific capacitance of 360 F g^(-1) at a current density of 1 Ag^(-1) with a capacitance retention rate of 89%after 8500 galvanostatic cycles,confirming the long-term stability of the Fe_(2)O_(3)/r GO fabric electrode.

关键词： supersonic spraying Conductive textile Wearable energy devices Reduced graphene oxide Iron oxide supercapacitor

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Bimetallic zeolitic imidazolate framework-derived substrate-free anode with superior cyclability for high-capacity lithium-ion batteries

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Journal of Materials science & Technology 2021年第8期67卷 116-126页

作者： Bhavana Joshi Edmund samuel Yong-il Kim Govindasami Periyasami Mostafizur Rahaman sam s.yoon school of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea Department of Physics NES Science CollegeSwami Ramanand Teerth Marathwada UniversityLatur RoadNandedMaharashtra431606India Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Freestanding carbon nanofibers loaded with bimetallic hollow nanocage structures were *** nanocages inherited the rhombic dodecahedral morphology of the zeolitic imidazolate framework(ZIF)precursors,ZIF-8 and *** anode materials for lithium-ion batteries(LIBs),the bimetallic nanocage-loaded freestanding carbon nanofibers effectively buffered volume expansions and alleviated pulverization through their different reduction and oxidation *** higher capacities of the composite anodes arose via the formation of the Li_(x)Zn alloy and Li_(2)O by Zn and Co ions,respectively,and the enhanced conductivity conferred by the carbon nanofibers.A synergistic effect of the composite components toward the strong electrochemical performance(688 m A h·g^(-1)at 1200 m A·g^(-1))of the bimetallic nanocage-loaded fibers was demonstrated through the superior long-term stability of the anode(1048 m A h·g^(-1)after 300 cycles at 100 m A·g^(-1)),suggesting that the fabricated anode can be a promising material for use in portable LIBs.

关键词： Carbon nanofiber Nanostructure Composite anode Zeolitic imidazolate framework

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Reusable and durable electrostatic air filter based on hybrid metallized microfibers decorated with metal–organic–framework nanocrystals

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Journal of Materials science & Technology 2021年第26期85卷 44-55页

作者： Min-Woo Kim Yong-Il Kinv Chanwoo Park Ali Aldalbahi Hamdah sAlanazi seongpil An Alexander L.Yarin sam s.yoon school of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea sKKU Advanced Institute of Nanotechnology(sAINT) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Nano Engineering Sungkyunkhwan University(SKKU)Suwon 16419Republic of Korea Department of Mechanical and Industrial Engineering University of Illinois at Chicago842 W.Taylor St.ChicagoIL 60607-7022USA

As global air pollution becomes increasingly severe,various types of fibrous filters have been developed to improve air filter ***,fibrous filters have limitations such as high packing density that generally causes high-pressure drop and ultimately deterioration in the filtration ***-pressure particulate matter precipitators are limited in terms of scope for commercialization because they require high voltage supplies and ozone *** this study,we develop fibrous filters with enhanced durability and improved performance using metallized microfibers decorated with metal-organic-framework(MOF)*** only does the efficiency of the developed filters remain at or above 97%for 0.50-1.5μm PMs but the durability also significantly *** addition,using the water purification ability of the MOF,we explore the dye degradation effect of the hybrid microfibers by immersing them into Rhodamine B aqueous *** such an experiment the Rhodamine B aqueous solution is completely purified by the presence of the hybrid microfibers under the UV irradiation.

关键词： Electrospinning Metallized microfibers Metal organic framework(MOF)nanocrystals Corona discharge Reusable fibrous filter for air purification

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Graphene-wrapped Ag3PO4/LaCO3OH heterostructures for water purification under visible light

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Journal of Energy Chemistry 2016年第5期25卷 845-853页

作者： santosh s.Patil Mukund G.Mali Animesh Roy Mohaseen s.Tamboli Virendrakumar G.Deonikar Deepak R.Patil Milind V.Kulkarni salem s.Al-Deyab sam s.yoon sanjay s.Kolekar Bharat B.Kale Centre for Materials for Electronics Technology(C-MET) Departnent of Electronics and Information Technology(DeitY)Govt.of IndiaPuneIndia Analytical Chemistry and Material science Laboratory Department of ChemitryShivaji UniversityKolhapurMS India solar Cell■Aerosol science Laboratory School of Mech.EngKorea UniversitySeoulSouth Korea and School of Chemical SciencesSolapur UniversitySolapurMSIndia Petrochemical Research Chair Department of ChemistryKing Saud UniversityRiyadhSaudi Arabia

We demonstrated a unique synthesis approach of graphene（GR）-wrapped AgPO/LaCOOH（APO/LCO）heterostructures by an in-situ wet chemical method. FEsEM analysis reveals the formation of rhombic dodecahedrons of APO decorated with LCO and later wrapped with GR flakes. Optical studies shows two absorption edges corresponding to the band gap energies of APO（2.41 eV） and LCO（4.1 eV）. Considering the absorption edge of the heterostructures in the visible region, the photocatalytic activities of photocatalysts containing different APO/LCO mass ratios were evaluated by the degradation of MB. GR-decorated composite with 20% LCO（APO/LCO20/GR） exhibited the highest photocatalytic activity for MB degradation, with a rate constant, k of 0.541 min. The photocatalytic activity of APO/LCO20/GR more greatly enhanced than those of the individual constituents（APO, LCO, APO/LCO20）. The enhanced photocatalytic activity of the heterostructure can be attributed to the co-catalytic effect of LCO as well as intriguing physicochemical properties of GR. To understand the enhanced photocatalytic activity of the heterostructures the photocatalytic reaction mechanism is proposed in detail. The recyclability of the APO/LCO/GR composite photocatalyst is further evaluated by reusing the catalyst in replicate photocatalytic experiments which shows consistent photocatalytic activity thereby confirms the stability and reusability of heterostructure photocatalyst.

关键词： Ag3PO4 LaCO3OH Graphene Heterostructures Photocatalytic MB degradation Co-catalyst

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Biochemical consequences of glucocerebrosidase 1 mutations in Parkinson’s disease

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Neural Regeneration Research 2024年第4期19卷 725-727页

作者： Jeong Hyun yoon Chiao-Yin Lee Anthony HV schapira Department of Clinical and Movement Neurosciences University College London Institute of Neurology Faculty of Medicine Imperial College London Aligning science Across Parkinson's(AsAP)Collaborative Research Network

Parkinson’s disease(PD,OMIM#168600)is a common neurodegenerative disorder with a global prevalence of approximately 8.5 *** is characterized by four cardinal motor symptoms:bradykinesia,rigidity,resting tremor,and subsequently by postural *** usually involves non-motor symptoms such as rapid eye movement sleep disorder,dementia,anosmia,and autonomic *** gene glucocerebrosidase 1(GBA1),which encodes the lysosomal enzyme glucocerebrosidase(GCase)(IUBMB:EC 3.***.1.45),shows strong linkage with PD;variants of GBA1 are the commonest genetic association with PD(sidransky et al.,2009).several mechanisms may underlie the relationship between GBA1 mutations/variants and the molecular pathology of PD(Figure 1A and B).

关键词： cerebro consequences

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Understanding pediatric surgical needs in North Korea: a modeling analysis

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World Journal of Pediatric surgery 2024年第1期7卷 47-53页

作者： Phillip J Hsu sangchul yoon Kee B Park University of Michigan Ann ArborMichiganUSA Department of Global Health and social Medicine Harvard Medical SchoolBostonMassachusettsUSA Department of Medical Humanitiesand social sciences Yonsei University SeoulSouth Korea

Background sixty-five percent of children worldwide lack access to surgical care,the majority of whom live in low-income and middle-income countries(LMiCs).Developing surgical infrastructure requires information on surgical need;however,this information is often limited in *** Korea(Democratic People's Republic of Korea,DPRK)has a low amount of publicly available ***,we analyzed available modeled data to understand the causes of pediatric deaths due to conditions treatable with surgery in *** We used World Bank data and models from the Institute for Health Metrics and Evaluation to identify causes of pediatric deaths affecting pediatric patients(ages).We compared mortality of disease between DPRK and countries with similar economic *** Between 1990 and 2019,the number of overall pediatric deaths has *** 2019,32.2%of allpediatric deaths in DPRK were caused by surgical *** leading categories of surgical conditions were injuries(53.9%),congenital conditions(34.2%),tumors(8.8%),and abdominal conditions(3.2%).DPRK has a lower relative rate of pediatric deaths compared with other LMICs with similar gross domestic product per ***,it has a higher relative rate of pediatric deaths due to conditions requiring treatment with *** injuries contribute significantly to the high rate of pediatric deaths in *** Although DPRK may be allocating overall resources toward pediatric healthcare more efficiently than economic peers,DPRK may benefit from improvement in pediatric surgical *** availability of data and close international collaboration could be potential solutions to bridge this gap.

关键词： pediatric surgical injuries

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Computing Resource Allocation for Blockchain-Based Mobile Edge Computing

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Computer Modeling in Engineering & sciences 2024年第7期140卷 863-885页

作者： Wanbo Zhang Yuqi Fan Jun Zhang Xu Ding Jung yoon Kim school of Computer science and Information Engineering Intelligent Interconnected Systems Laboratory of Anhui ProvinceHefei University of TechnologyHefei230601China Anhui Province Key Lab of Aerospace structural Parts Forming Technology and Equipment Hefei University of TechnologyHefei230009China College of Future Industry Gachon UniversitySeongnam13120South Korea

Users and edge servers are not fullymutually trusted inmobile edge computing(MEC),and hence blockchain can be introduced to provide *** blockchain-basedMEC,each edge server functions as a node in bothMEC and blockchain,processing users’tasks and then uploading the task related information to the *** is,each edge server runs both users’offloaded tasks and blockchain tasks *** that there is a trade-off between the resource allocation for MEC and blockchain ***,the allocation of the resources of edge servers to the blockchain and theMEC is crucial for the processing delay of blockchain-based *** of the existing research tackles the problem of resource allocation in either blockchain or MEC,which leads to unfavorable performance of the blockchain-based MEC *** this paper,we study how to allocate the computing resources of edge servers to the MEC and blockchain tasks with the aimtominimize the total systemprocessing *** the problem,we propose a computing resource Allocation algorithmfor Blockchain-based MEC(ABM)which utilizes the slater’s condition,Karush-Kuhn-Tucker(KKT)conditions,partial derivatives of the Lagrangian function and subgradient projection method to obtain the *** results show that ABM converges and effectively reduces the processing delay of blockchain-based MEC.

关键词： Mobile edge computing blockchain resource allocation

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