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Journal of Materials Science & Tech.ology 2020年第5期40卷 168-175页

作者： Mi Gyeong kim Wan-Kuen Jo Department of Environmental Engineering Kyungpook National University 80 University RoadBukguDaegu702-701Republic of Korea

To investigate whether the arrangement of componentsin multi-composite photocatalysts may affect their photocatalytic properties,due to different ch.rge-transfer routes,two ternary-nanocomposite photocatalysts with different component arrangements,comprising n-doped carbon quantum dots(nCQDs),g-C3n4(Cn),and Bi2WO6(BWO)(hereafter referred to as nCQDs/Cn/BWO),were developed,and the photocatalytic degradation of model hazardous vapors under visible-light illumination was *** I nCQDs/Cn/BWO,which.was developed by the combination of nCQDs/BWO and Cn,exhibited photocatalytic ability superior to that of type II nCQDs/Cn/BWO,which.was developed by the combination of Cn/BWO and nCQDs;the superior photocatalytic ability corresponded to the dual properties of nCQDs:ch.rge mediation and upconversion ***,the photocatalytic ability of nCQDs/Cn/BWO was greater than those of the reference catalysts;in addition,this photocatalyst exhibited outstanding photoch.mical ***,the effects of Cn/(BWO+Cn)weight ratio of the Cn/BWO dual nanocomposites and the nCQDs/(BWO+Cn+nCQDs)weight percentage of nCQDs/Cn/BWO ternary nanocomposites on the pollutant removal efficiency were *** plausible mech.nisms over the two nCQDs/Cn/BWO photocatalysts for the degradation of hazardous vapors were *** component arrangement approach.proposed herein afforded a tech.ique toward the perceptive development of novel multi-component heterostructures for the photocatalytic degradation of hazardous vapors.

关键词： Component arrangement ch.rge-transfer route nCQDs dual role ch.rge mediator Upconversion photoluminescence

Stretch.ble and colorless freestanding microwire arrays for transparent solar cells with flexibility

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Light(Science & Applications) 2019年第1期8卷 47-59页

作者： Sung Bum Kang Ji-Hwan kim Myeong Hoon Jeong Amit Sanger ch.n Ul kim ch.l-Min kim Kyoung Jin ch.i Department of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea

Transparent solar cells(TSCs)are emerging devices that combine the advantages of visible transparency and light-toelectricity ***,existing TSCs are based predominantly on organics,dyes,and perovskites;however,the rigidity and color-tinted transparent nature of those devices strongly limit the utility of the resulting TSCs for realworld ***,we demonstrate a flexible,color-neutral,and high-efficiency TSC based on a freestanding form of n-silicon microwires(SiMWs).Flat-tip SiMWs with controllable spacing are fabricated via deep-reactive ion etch.ng and embedded in a freestanding transparent polymer *** light transmittance can be tuned from ~10 to 55% by adjusting the spacing between the *** TSCs,a heterojunction is formed with a p-type polymer in the top portion of the n-type flat-tip *** contact with an indium-doped ZnO film occurs at the bottom,and the side surface has an Al2O3 passivation ***,slanted-tip SiMWs are developed by a novel solventassisted wet etch.ng method to manipulate light ***-difference time-domain simulation revealed that the reflected light from slanted-tip SiMWs helps light-matter interactions in adjacent *** TSC based on the slanted-tip SiMWs demonstrates 8%efficiency at a visible transparency of 10% with *** efficiency is the highest among Si-based TSCs and comparable with that of state-of-the-art neutral-color TSCs based on organic–inorganic hybrid perovskite and ***,unlike others,the stretch.ble and transparent platform in this study is promising for future TSCs.

关键词： transparent transparency spacing

Effect of activated sludge treatment on the formation of n–nitrosamines under different ch.oramination conditions

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Journal of Environmental Sciences 2022年第7期34卷 242-252页

作者： Xiaolu Zhang Daekyun kim Tanju Karanfil Department of Environmental Engineering and Earth Sciences Clemson UniversityAndersonSC 29625USA

Municipal wastewater disch.rge is considered as one of the main sources of n-nitrosamine precursors which.can impact the qualities of downstream source waters and reclaimed wastewaters for potable reuse. n –nitrosamine precursors can be removed to various degrees during biological wastewater treatment(e.g., the activated sludge(AS) process). So far, little is known about the impact of the AS process on n-nitrosamine formation under practical disinfection condition(e.g., uniform formation condition(UFC)). In this study, n-nitrosamine UFC from selected model compounds, sewage components(i.e., blackwaters and greywaters) and sewage samples were comprehensively investigated during batch.AS treatment tests. n –nitrosodimethylamine(nDMA) formation from the tested precursor compounds(i.e., trimethylamine(TMA) and sumatriptan(SMTR)) under UFC ch.oramination decreased mostly after 6 or 24 hr treatment with different types of AS(i.e., domestic rural AS, domestic urban AS, and textile AS), and the reductions in nDMA UFC were comparable to their nDMA formation potential(FP) reductions. In urine and feces blackwaters, nDMA UFC increased after 6 or 24 hr treatment with the domestic(i.e., rural and urban) AS, while nDMA FP decreased substantially. The increases in nDMA UFC after AS treatment was presumably attributed to the removal of bulk organic matters(e.g., dissolved organic carbon(DOC)) which.favored nDMA formation under UFC. On the other hand, in laundry greywaters having relatively abundant DOC, n-nitrosamine UFC was less affected by DOC removal before or after AS treatment, but decreased to similar degrees with n-nitrosamine FP. In sewage samples collected from wastewater treatment plants, n-nitrosamines UFC tended to increase or remain constant during AS treatment, despite the decreases in their FPs. These results suggest that biological wastewater treatment(e.g., the AS process) may not effectively reduce n-nitrosamine formation(e.g., measured under UFC) partially becaus

关键词： Disinfection by-products n–nitrosamine formation potential Uniform formation condition(UFC) Sewage components Biological wastewater treatment

Effect of carrier gas species on the microstructure and compressive deformation behaviors of ultra-strong pure copper manufactured by cold spray additive manufacturing

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Journal of Materials Science & Tech.ology 2022年第2期97卷 264-271页

作者： Young-Kyun kim Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon 22212Republic of Korea

Cold spray(CS)which.has recently become a promising additive manufacturing(AM)tech.ology,was used to fabricate ultra-strong pure *** addition,the effects of carrier gas species on the microstructural ch.racteristics,mech.nical properties and deformation mech.nisms were systemically *** CSAM copper manufactured with n_(2) carrier gas reveals a heterogeneous bimodal microstructure consisting of ultra-fine grains at the particle interface and relatively coarse grains in inner *** He carrier gas,a homogeneous grain structure consisting of ultra-fine grains in most areas was *** tests showed that n_(2) and He carrier gasses enabled ultra-high yield strengths of 340 and415 MPa,*** values are comparable to severely plastic deformed copper,which.has extremely low ductility and shape *** the other hand,both samples showed a strain-softening phenomenon that does not commonly occur at room *** deformation microstructures revealed that dynamic recovery(DRV)and dynamic recrystallization(DRX)phenomena were generated despite being deformed at room *** on the above findings,the overall deformation mech.nisms according to the carrier gas species in the CSAM copper manufacturing process were ***,the work hardening and softening behaviors of CSAM Cu are predicted by using a constitutive equation.

关键词： Cold spray additive manufacturing Carrier gas Pure Cu Mech.nical properties Deformation behavior

Fragmentation stability and retention time-shift obtained by LC-MS/MS to distinguish sialylated n-glycan linkage isomers in therapeutic glycoproteins

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Journal of Pharmaceutical Analysis 2023年第3期13卷 305-314页

作者： ch. Soo Park Minju Kang Ahyeon kim ch.lmin Moon Mirae kim Jieun kim Subin Yang Leeseul Jang Ji Yeon Jang Ha Hyung kim Department of Global Innovative Drugs Graduate School of Chung-Ang UniversitySeoul06974Republic of Korea

Sialylated n-glycan isomers withα2-3 orα2-6 linkage(s)have distinctive roles in glycoproteins,but are difficult to ***-type(WT)and glycoengineered(mutant)therapeutic glycoproteins,cytotoxic T lymphocyte-associated antigen-4-immunoglobulin(CTLA4-Ig),were produced in ch.nese hamster ovary cell lines;however,their linkage isomers have not been *** this study,n-glycans of CTLA4-Igs were released,labeled with procainamide,and analyzed by liquid ch.omatography-tandem mass spectrometry(MS/MS)to identify and quantify sialylated n-glycan linkage *** linkage isomers were distinguished by comparison of 1)intensity of the n-acetylglucosamine ion to the sialic acid ion(Ln/nn)using different fragmentation stability in MS/MS spectra and 2)retention time-shift for a selective m/z value in the extracted ion *** isomer was distinctively identified,and each.quantity(>0.1%)was obtained relative to the total n-glycans(100%)for all observed ionization *** sialylated n-glycan isomers with onlyα2-3 linkage(s)in WT were identified,and each.isomer's sum of quantities was 50.4%.Furthermore,39 sialylated n-glycan isomers(58.8%)in mono-(3 n-glycans;0.9%),bi-(18;48.3%),tri-(14;8.9%),and tetra-(4;0.7%)antennary structures of mutant were obtained,which.comprised mono-(15 n-glycans;25.4%),di-(15;28.4%),tri-(8;4.8%),and tetra-(1;0.2%)sialylation,respectively,with onlyα2-3(10 n-glycans;4.8%),bothα2-3 andα2-6(14;18.4%),and onlyα2-6(15;35.6%)linkage(s).These results are consistent with those forα2-3 neuraminidase-treated *** study generated a novel plot of Ln/nn versus retention time to distinguish sialylated n-glycan linkage isomers in glycoprotein.

关键词： Therapeutic glycoprotein Sialylation Linkage isomer LC-MS/MS

nontarget screening using passive air and water sampling with a level Ⅱ fugacity model to identify unregulated environmental contaminants

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Journal of Environmental Sciences 2017年第12期29卷 84-91页

作者： In-Young ch.ng Yu-Mi Park Hyun-Jeoung Lee Hyuk kim Dong-Hoon kim Il-Gyu kim Sang-Min kim Young-Sun Do Kwang-Seol Seok Jung-Hwan Kwon ch.mical Research.Division Environmental Health Research Department National Institute of Environmental ResearchIncheon Division of Environmental Science and Ecological Engineering Korea University

It is thought that there are many unregulated anthropogenic ch.micals in the *** risk assessment of ch.micals, it is essential to estimate the predicted environmental concentrations. As an effort of identifying residual organic contaminants in air and water in Korea, nontarget screening using two-dimensional gas ch.omatography time-of-flight mass spectrometry（GC × GC-TOFMS） was conducted at 10 sites using polyurethane foam passive air sampler and at 6 sites using polydimethyl siloxane（PDMS） passive water sampler in three different seasons in 2014. More than 600 ch.mical peaks were identified satisfying the identification criteria in air and water samples, respectively, providing a list for further investigation. ch.mical substances with reported national emission rates in2014（n = 149） were also screened for potential existence in the environment using a level Ⅱ fugacity model. Most of ch.mical substances classified as not detectable were not identified with detection frequency greater than 20% by nontarget screening, indicating that a simple equilibrium model has a strong potential to be used to exclude ch.micals that are not likely to remain in the environment after emissions from targeted monitoring.

关键词： nontarget screening GC × GC-TOFMS Passive sampling Pollutant release and transfer register(PRTR) Fugacity model

Graphene-Gan Sch.ttky diodes

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nano Research 2015年第4期8卷 1327-1338页

作者： Seongjun kim Tae Hoon Seo Myung Jong kim Keun Man song Eun-Kyung Suh Hyunsoo kim Sch.ol of Semiconductor and ch.mical Engineering Semiconductor Physics Research Center Chonbuk National University Jeonju 561-756 Republic of Korea Soft Innovative Materials Research.Center Korea Institute of Science and Technology Jeonbuk 561-905 Republic of Korea Korea Advanced nano Fab Center Suwon 443-700 Republic of Korea

The electrical ch.racteristics of graphene Sch.ttky contacts formed on undoped Gan semiconductors were investigated. Excellent rectifying behavior with a rectification ratio of -10^7 at ±2 V and a low reverse leakage current of 1.0 × 10^-8 A/cm^2 at -5 V were observed. The Sch.ttky barrier heights, as determined by the thermionic emission model Rich.rdson plots, and barrier inhomogeneity model, were 0.90, 0.72, and 1.24 ± 0.13 eV, respectively. Despite the predicted low barrier height of -0.4 eV at the graphene-Gan interface, the formation of excellent rectifying ch.racteristics with much.larger barrier heights is attributed to the presence of a large number of surface states （1.2 x 1013 states/cm2/eV） and the internal spontaneous polarization field of Gan, resulted in a significant upward surface band bending or a bare surface barrier height as high as of 2.9 eV. Using the S parameter of 0.48 （measured from the work function dependence of Sch.ttky barrier height） and the mean barrier height of 1.24 eV, the work function of graphene in the Au/graphene/Gan stack could be approximately estimated to be as low as 3.5 eV. The obtained results indicate that graphene is a promising candidate for use as a Sch.ttky rectifier in Gan semiconductors with n-type conductivity.

关键词： graphene Gan Sch.ttky diode Sch.ttky barrier height Fermi level pinning

Wind Driven Optimization-Based Medical Image Encryption for Blockch.in-Enabled Internet of Things Environment

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Computers, Materials & Continua 2022年第11期73卷 3219-3233页

作者： C.S.S.Anupama Raed Alsini n.Supriya E.Laxmi Lydia Seifedine Kadry Sang-Soo Yeo Yongsung kim Department of Electronics&Instrumentation Engineering V.R.Siddhartha Engineering CollegeVijayawada520007India Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Computer Science and Engineering Malla Reddy Engineering College(A)Hyderabad500100India Department of Computer Science and Engineering Vignan’s Institute of Information TechnologyVisakhapatnam530049India Department of Applied Data Science Noroff University College4612KristiansandNorway Department of Computer Engineering Mokwon UniversityDaejeon35349Korea Department of Tech.ology Education Chungnam National University 99Daehak-roYuseong-guDaejeon34134Korea

Internet of Things(IoT)and blockch.in receive significant interest owing to their applicability in different application areas such.as healthcare,finance,transportation,*** image security and privacy become a critical part of the healthcare sector where digital images and related patient details are communicated over the public *** paper presents a new wind driven optimization algorithm based medical image encryption(WDOA-MIE)tech.ique for blockch.in enabled IoT *** WDOA-MIE model involves three major processes namely data collection,image encryption,optimal key generation,and data ***,the medical images were captured from the patient using IoT ***,the captured images are encrypted using signcryption *** addition,for improving the performance of the signcryption tech.ique,the optimal key generation procedure was applied by WDOA *** goal of the WDOA-MIE algorithm is to derive a fitness function dependent upon peak signal to noise ratio(PSnR).Upon successful encryption of images,the IoT devices transmit to the closest server for storing it in the blockch.in *** performance of the presented method was analyzed utilizing the bench.ark medical image *** security and the performance analysis determine that the presented tech.ique offers better security with maximum PSnR of 60.7036 dB.

关键词： Internet of things image security medical images encryption optimal key generation blockch.in

Upcycling end of lithium cobalt oxide batteries to electrocatalyst for oxygen reduction reaction in direct methanol fuel cell via sustainable approach

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Journal of Energy ch.mistry 2023年第7期82卷 148-157,I0004页

作者： Keyru Serbara Bejigo Kousik Bhunia Jungho kim ch.ehyeon Lee Seoin Back Sang-Jae kim nanomaterials&System Lab Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea nanomaterials&System Lab Major of Mechanical System EngineeringCollege of EngineeringJeju National UniversityJeju 63243Republic of Korea Research.Institute of new Energy Industry(RInEI) Jeju National UniversityJeju 63243Republic of Korea Department of ch.mical and Biomolecular Engineering Institute of Emergent MaterialsSogang UniversitySeoul 04107Republic of Korea

Recycling spent lithium-ion batteries(SLIBs)has become essential to preserve the environment and reclaim vital resources for sustainable *** typical SLIBs recycling concentrated on separating valuable components had limitations,including high energy consumption and complicated separation *** work suggests a safe hydrometallurgical process to recover usable metallic cobalt from depleted LiCoO_(2)batteries by utilizing citric acid as leach.nt and hydrogen peroxide as an oxidizing agent,with ethanol as a selective precipitating *** anode graphite was also recovered and converted to graphene oxide(GO).The above components were directly resynthesized to cobaltintegrated nitrogen-doped graphene(Co@nG).The Co@nG showed a decent activity towards oxygen reduction reaction(ORR)with a half-wave potential of 0.880 V ***,almost similar to Pt/C(0.888 V ***)and with an onset potential of 0.92 V *** metal-nitrogen-carbon(Co-n-C)having the highest nitrogen content has decreased the barrier for ORR since the reaction was enhanced for Co@nG-800,as confirmed by density functional theory(DFT)*** Co@nG cathode catalyst coupled with commercial Pt-Ru/C as anode catalyst exhibits excellent performance for direct methanol fuel cell(DMFC)with a peak power density of 34.7 mW cm^(-2)at a disch.rge current density of120 m A cm^(-2)and decent stability,indicating the promising utilization of spent battery materials in DMFC ***,lithium was recovered from supernatant as lithium carbonate by coprecipitation *** work avoids sophisticated elemental separation by utilizing SLIBs for other renewable energy applications,lowering the environmental concerns associated with recycling.

关键词： Density functional theory(DFT) Direct methanol fuel cell Leach.ng nitrogen doping Oxygen reduction reaction Recycling Spent lithium-ion batteries

Passivation engineering via silica‐encapsulated quantum dots for highly sensitive photodetection

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Carbon Energy 2023年第9期5卷 49-62页

作者： Ji Yun ch.n Byung Gi kim Jin Young kim Woongsik Jang Dong Hwan Wang Sch.ol of Integrative Engineering Chung‐Ang UniversitySeoulRepublic of Korea

Organometal halide perovskites are promising semiconducting materials for photodetectors because of their favorable optoelectrical *** nanoscale perovskite materials such.as quantum dots(QDs)show novel behavior,they have intrinsic stability *** this study,an effectively silane barrier-capped quantum dot(QD@APDEMS)is thinly applied onto a bulk perovskite photosensitive layer for use in ***@APDEMS is synthesized with a silane ligand with hydrophobic ch.(3)-terminal groups,resulting in excellent dispersibility and durability to enable effective *** introduction of the QD@APDEMS layer results in the formation of a lowdefect perovskite film with enlarged *** is attributed to the grain boundary interconnection effect via interaction between the functional groups of QD@APDEMS and uncoordinated Pb^(2+)in grain *** passivating the grain boundaries,where various trap sites are distributed,hole ch.rgecarrier injection and shunt leakage can be ***,from the energy point of view,the deep highest occupied molecular orbital(HOMO)level of QD@APDEMS can work as a hole ch.rge injection *** ch.rge dynamics(generation,transfer,and recombination properties)and reduced trap density of QD@APDEMS are *** this perovskite film is used in a photodetector,the device performance(especially the detectivity)stands out among existing perovskites evaluated for energy sensing device applications.

关键词： grain boundary passivation perovskite quantum dots photodetectors photosensitive layers trap