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Utilization of the superior properties of highly mesoporous PVP modified NiCo_2O_4 with accessible 3D nanostructure and flower-like morphology towards electrochemical methanol oxidation reaction

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Journal of Energy Chemistry 2019年第2期28卷 136-146页

作者： Gracita m.Tomboc medhen W.Abebe Anteneh F.Baye Hern kim Department of Energy Science and Technology Smart Living Innovation Technology CenterMyongji University

Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DmFCs) because of the high overpotential required to oxidize the methanol and its relatively poor performance due to CO poisoning of the leading-high cost anode *** line with this,we have successfully modified the morphological structure and composition of low cost cobalt based-metal oxides,mCo_2O_4(m = Zn and Ni),with the simple and noble use of polyvinyl pyrrolidone(PVP) as growth modifier and surface stabilizer during the synthesis of nanoparticles in our previous reports,which shown high electrocatalytic activity and strong *** to the good performance of our PVP modified mCo_2O_4 towards pseudocapacitor and oxygen evolution reaction applications,we decided to extend our research study to methanol oxidation ***,PVP modified Ni Co_2O_4 electrode directly grown on nickel foam substrate via a simple hydrothermal process exhibited better performance compared with PVP modified ZnCo_2O_4 and NiCo_2O_4 without *** had obtained a remarkably low onset potential of 0.285 V and high current density of 280 m A cm^(-2),and shown great stability and high poison tolerance during a continuous CV cycling and Chronoamperometry test,which attained high efficiency of 86.86%and 98.52%,*** positive results of PVP modified Ni Co_2O_4 electrode towards mOR might be attributed to its hierarchical 3 D nanostructures with highly mesoporous surface and large surface area which may have provided numerous electroactive sites,and the exceptional corrosion stability of Ni Co_2O_4 electrode in alkaline solution.

关键词： NiCo2O4 3D nanostructure Electrochemical methanol oxidation Current density

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Engineered 3D liver-tissue model with minispheroids formed by a bioprinting process supported with in situ electrical stimulation

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Bioactive materials 2024年第5期35卷 382-400页

作者： WonJin kim GeunHyung kim Department of Precision medicine Sungkyunkwan University School of Medicine(SKKU-SOM)Suwon16419Republic of Korea Institute of Quantum Biophysics Department of BiophysicsSungkyunkwan UniversitySuwon16419Republic of Korea Biomedical Institute for Convergence at SKKU(BICS) Sungkyunkwan UniversitySuwon16419Republic of Korea

Three-dimensional(3D)bioprinting,an effective technique for building cell-laden structures providing native extracellular matrix environments,presents challenges,including inadequate cellular *** address these issues,cell spheroids offer a promising solution for improving their biological ***,minispheroids with 50-100μm diameters exhibit enhanced cellular *** propose a one-step minispheroid-forming bioprinting process incorporating electrical stimulation(E-mS-printing).By stimulating the cells,minispheroids with controlled diameters were generated by manipulating the bioink viscosity and stimulation *** validate its feasibility,E-mS-printing process was applied to fabricate an engineered liver model designed to mimic the hepatic lobule unit.E-mS-printing was employed to print the hepatocyte region,followed by bioprinting the central vein using a core-shell *** resulting constructs displayed native liver-mimetic structures containing minispheroids,which facilitated improved hepatic cell maturation,functional attributes,and vessel *** results demonstrate a new potential 3D liver model that can replicate native liver tissues.

关键词： Bioprinting In situ electric field minispheroids In vitro liver-tissue model Hepatic lobule

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Wave solutions and numerical validation for the coupled reaction-advection-diffusion dynamical model in a porous medium

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Communications in Theoretical Physics 2022年第12期74卷 9-20页

作者： Ali m mubaraki Hwajoon kim R I Nuruddeen Urooj Akram Yasir Akbar Department of mathematics and Statistics Collage of ScienceTaif UniversityP O Box 11099Taif 21944Saudi Arabia Kyungdong University YangjuRepublic of Korea Department of mathematics Faculty of ScienceFederal University DutseP O Box 7156 DutseJigawa StateNigeria Department of mathematics COMSATS University IslamabadLahorePakistan Department of mathematics COMSATS University Islamabad44000 IslamabadPakistan

The current study examines the special class of a generalized reaction-advection-diffusion dynamical model that is called the system of coupled Burger’s *** system plays a vital role in the essential areas of physics,including fluid dynamics and ***,two promising analytical integration schemes are employed for the study;in addition to the deployment of an efficient variant of the eminent Adomian decomposition *** sets of analytical wave solutions are revealed,including exponential,periodic,and dark-singular wave solutions;while an amazed rapidly convergent approximate solution is acquired on the other *** the end,certain graphical illustrations and tables are provided to support the reported analytical and numerical *** doubt,the present study is set to bridge the existing gap between the analytical and numerical approaches with regard to the solution validity of various models of mathematical physics.

关键词： reaction-advection-diffusion model Burger’s equations mETEm Km NLDm

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Three metabolites from an entomopathogenic bacterium, Xenorhabdus nematophila, inhibit larval development of Spodoptera exigua （Lepidoptera： Noctuidae） by inhibiting a digestive enzyme, phospholipase A2

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Insect Science 2011年第3期18卷 282-288页

作者： Jaehyun kim Yonggyun kim Department of Bioresource Sciences Andong National University Andong Korea

An entomopathogenic bacterium, Xenorhabdus nematophila, has been known to induce significant immunosuppression of target insects by inhibiting immune-associated phospholipase A2 （PLA2）, which subsequently shuts down biosynthesis of eicosanoids that are critical in immune mediation in insects. Some metabolites originated from the bacterial culture broth have been identified and include benzylideneacetone, proline-tyrosine and acetylated phenylalanine-glycine-valine, which are known to inhibit enzyme activity of PLA2 extracted from hemocyte and fat body. This study tested their effects on digestive PLA2 of the beet armyworm, Spodoptera exigua. Young larvae fed different concentrations of the three metabolites resulted in significant adverse effects on larval development even at doses below 100 #g/mL. In particular, they induced significant reduction in digestive efficiency of ingested food. All three metabolites significantly inhibited catalytic activity of digestive PLA2 extracted from midgut lumen of the fifth instar larvae at a low micromolar range. These results suggest that the inhibitory activities of the three bacterial metabolites on digestive PLA2 of S. exigua midgut may explain some of their oral toxic effects.

关键词： digestion midgut phospholipase A2 Spodoptera exigua Xenorhabdus nematophila

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Investigation of the nutritional and functional roles of a combinational use of xylanase and β-glucanase on intestinal health and growth of nursery pigs

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Journal of Animal Science and Biotechnology 2024年第5期15卷 1932-1950页

作者： Hyunjun Choi Yesid Garavito Duarte Guilherme A.m.Pasquali Sung Woo kim Department of Animal Science North Carolina State University116 Polk HallCampus Box 7621RaleighNC 27695USA BASF SE Ludwigshafen 67056Germany

Background Xylanase andβ-glucanase combination(XG)hydrolyzes soluble non-starch polysaccharides that are anti-nutritional *** study aimed to evaluate the effects of increasing levels of XG on intestinal health and growth performance of nursery *** Forty pigs(6.5±0.4 kg)were assigned to 5 dietary treatments and fed for 35 d in 3 phases(11,9,and 15 d,respectively).Basal diets mainly included corn,soybean meal,and corn distiller's dried grains with solubles,contained phytase(750 FTU/kg),and were supplemented with 5 levels of XG at(1)0,(2)280 TXU/kg xylanase and 125 TGU/kgβ-glucanase,(3)560 and 250,(4)840 and 375,or(5)1,120 and 500,*** performance was *** d 35,all pigs were euthanized and jejunal mucosa,jejunal digesta,jejunal tissues,and ileal digesta were collected to determine the effects of increasing XG levels and XG intake on intestinal *** Increasing XG intake tended to quadratically decrease(P=0.059)viscosity of jejunal digesta(min:1.74 m Pa·s at 751/335(TXU/TGU)/kg).Increasing levels of XG quadratically decreased(Pmin:0.6%at 630/281(TXU/TGU)/kg)in the jejunal *** XG intake quadratically increased(Pmax:40.3%at 608/271(TXU/TGU)/kg)in the jejunal *** XG intake quadratically decreased(Pmin:1.6%at 560/250(TXU/TGU)/kg)in the jejunal *** levels of XG tended to linearly decrease(P=0.073)jejunal Ig G and tended to quadratically increase(P=0.085)jejunal villus height to crypt depth ratio(max:2.62 at 560/250(TXU/TGU)/kg).Increasing XG intake tended to linearly increase the apparent ileal digestibility of dry matter(P=0.087)and ether extract(P=0.065).Increasing XG intake linearly increased(Pmbinational use of xylanase andβ-glucanase would hydrolyze the non-starch polysaccharides fractions,positively modulating the jejunal mucosa-associated *** intake of

关键词： Glucanase Growth performance Intestinal health Nursery pigs Xylanase

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Rapid synthesis of moS_(2)-Ag nanocomposites via photoreduction for optical tuning and surface-enhanced Raman scattering applications

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Journal of materiomics 2023年第2期9卷 229-234页

作者： Yoonkyung Lee Eunpa kim Hyeongkeun kim Kyunghoon kim School of mechanical Engineering Sungkyunkwan UniversitySuwon16419Republic of Korea Samsung Electronics Semiconductor R&DAdvanced Manufacturing Engineering TeamPyeongtaek17786Republic of Korea Korea Electronics Technology Institute Seongnam13509Republic of Korea

Semiconductoremetal nanocomposites have been widely investigated to modify the intrinsic properties of materials used for optoelectronic devices and sensing *** this study,a method for rapid synthesis of moS_(2)-Ag nanocomposites via laser-assisted photoreduction was *** the photoreduction process,we used AgNO_(3)solution as a metal *** laser irradiation,Ag ions were easily reduced on moS_(2)by photo-generated electrons from moS_(2).The optical properties of moS_(2)-Ag nanocomposites were easily controlled by simple adjustment of the photoreduction *** investigate the surface-enhanced Raman scattering(SERS)effect of the moS_(2)-Ag nanocomposites,the SERS spectra of methylene blue(mB)on moS_(2)-Ag nanocomposites were measured,and the nanocomposites were found to enhance the Raman scattering intensity of mB up to~***,the laser-assisted photoreduction method has great potential for rapid synthesis and optical tuning of semiconductoremetal nanocomposites.

关键词： molybdenum disulfide(moS2) Silver(Ag) Photoreduction Optical tuning Surface-enhanced Raman scattering(SERS)

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A review on technologies with electricity generation potentials using liquified natural gas regasification cold energy

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Frontiers in Energy 2023年第3期17卷 332-379页

作者： muhammad Tauseef NASIR mirae kim Jaehwa LEE Seungho kim Kyung Chun kim School of mechanical Engineering Eco-friendly Smart Ship Parts Technology Innovation CenterPusan National UniversityBusan 46241South Korea School of mechanical Engineering Pusan National UniversityBusan 46241South Korea Korea Gas Corporation Daegu 41062South Korea

In modern times,worldwide requirements to curb greenhouse gas emissions,and increment in energy demand due to the progress of humanity,have become a serious *** such scenarios,the effective and efficient utilization of the liquified natural gas(LNG)regasification cold energy(RCE),in the economically and environmentally viable methods,could present a great opportunity in tackling the core issues related to global warming across the *** this paper,the technologies that are widely used to harness the LNG RCE for electrical power have been *** systems incorporating,the Rankine cycles,Stirling engines,Kalina cycles,Brayton cycles,Allam cycles,and fuel cells have been ***,the economic and environmental studies apart from the thermal studies have also been ***,the discussion regarding the systems with respect to the regassification pressure of the LNG has also been *** aim of this paper is to provide guidelines for the prospective researchers and policy makers in their decision making.

关键词： liquified natural gas cold energy power generation

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Re-visiting supersymmetric Janus solutions: a perturbative construction

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Chinese Physics C 2020年第7期44卷 43-54页

作者： Nakwoo kim Se-Jin kim Department of Physics and Research Institute of Basic Science Kyung Hee UniversitySeoul 02447Republic of Korea

We construct holographic Janus solutions,which describe a conformal interface in the theory of m2-branes,in four-dimensional gauged supergravities using a perturbative *** particular,we study three Einsteinscalar systems and their BPS equations,which are derived by Bobev,Pilch,and Warner(2014).The actions of our interest are all consistent truncations of D=11 supergravity,chosen to be invariant under SO(4)×SO(4),SU(3)×U(1)×U(1),and G2 symmetry subgroups of SO(8).The utility of our semi-analytic result is illustrated by the calculation of minimal area surface and the associated holographic entanglement entropy.

关键词： holography Janus solutions supergravity entanglement entropy

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In-situ electrochemical functionalization of carbon materials for high-performance Li–O2 batteries

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Journal of Energy Chemistry 2020年第9期29卷 7-13,I0001页

作者： Jungwon Kang Jin min kim Do Youb kim Jungdon Suk Jaekook kim Dong Wook kim Yongku Kang Department of Advanced materials Science and Engineering Mokpo National University61 dorim-ri1666 Yeongsan-roCheonggye-myeonMuan-gunJeonnamSouth Korea Center for Advanced Battery materials Advanced Materials DivisionKorea Research Institute of Chemical Technology(KRICT)141 Gajeong-RoYuseong-GuDaejeon 305-600South Korea Department of materials Science and Engineering Chonnam National University300 Yongbong-dongBukguGwangju 500-757South Korea

The development of effective synthetic routes is important to manifest proper nature of specific ***-situ electrochemical functionalization possesses great advantages over conventional routes,especially facile way and leading to reaching elaborate sites of functional ***,we demonstrate the preparation of functionalized carbons by in-situ electrochemical reduction in an argon atmosphere for application in low-cost,environmentally benign,and high-performance oxygen-electrodes for non-aqueous Li-O2 batteries.A Li-O2 battery with functionalized carbon shows a high discharge capacity(100 times that of pristine carbon),high power and cycling *** outstanding performance is attributed to the high O2 affinity of the functionalized carbon surface that facilitates the formation of soluble and diffusible superoxide intermediates by the reduction of the remaining O2 competing with surface growth for Li2O2 formation.

关键词： Lithium-oxygen battery High areal capacity Functionalization of carbon Electrochemistry

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Investigation of operation and degradation mechanisms in ZnTeSe blue quantum-dot light-emitting diodes by identifying recombination zone

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Nano Research 2024年第7期17卷 6527-6533页

作者： Oul Cho Sujin Park Hogeun Chang Jiwhan kim Jaekwon kim Sungwoo kim Taehyung kim Jeonghun Kwak Department of Electrical and Computer Engineering Inter-university Semiconductor Research Centerand Soft Foundry InstituteSeoul National UniversitySeoul 08826Republic of Korea material Research Center Samsung Advanced Institute of TechnologySuwonGyeonggi-do 16419Republic of Korea

ZnTeSe quantum dots(QDs),recognized as promising eco-friendly blue electroluminescent emitters,remain under-explored in light-emitting diode(LED)***,to elucidate the operation and degradation mechanisms of ZnTeSe blue QD-LEDs,stacked ZnTeSe QD layers with discernable luminescence are designed by varying Te doping concentrations,and the recombination zones(RZs)of the blue QD-LEDs are *** RZs are identified near the hole-transport layer(HTL),confirmed by angular-dependent electroluminescence measurements and optical *** addition,in order to investigate carrier dynamics in the process of recombination,the transient electroluminescence(tr-EL)signals of the dichromatic QD-LEDs are *** a result,it is inferred that the RZ initially formed near the electron-transport layer(ETL)due to the high injection barriers of ***,due to the fast electron mobility,the RZ shifts toward the HTL as the operating current *** the device lifetime tests,the RZ remains stationary while the photoluminescence(PL)corresponding to the RZ undergoes a substantial decrease,indicating that the degradation is accelerated by the concentrated *** this study contributes to a deeper understanding of the operational mechanisms of ZnTeSe blue QD-LEDs.

关键词： quantum dots light-emitting diodes degradation recombination zones carrier dynamics

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