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Fabrication of 3D Printed PCL/PEG Polyblend Scaffold Using Rapid Prototyping System for Bone Tissue Engineering Application

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Journal of Bionic Engineering 2018年第3期15卷 435-442页

作者： Su A Park Sang jin Lee ji min seok Jun Hee Lee Wan Doo Kim Il Keun Kwon Department of Nature-Inspired Nanoconvergence Systems Korea Institute of Machinery and Materials 156 Gajeongbuk-ro Yuseong-gu Daejeon 34103 Republic of Korea Department of Dental Materials School of Dentistry Kyung Hee University 26 Kyungheedae-ro Dongdaemun-gu Seou102447 Republic of Korea

Three-dimensional （3D） printing is a novel process used to manufacture bone tissue engineered scaffolds. This process allows for easy control of the architecture at the micro structure. However, the scaffold properties are typically limited in terms of cellular activity at the scaffold surface due to the printed materials properties. In this study, we developed a polycaprolactone （PCL） blended with polyethylene glycol （PEG） 3D printed scaffold using a rapid prototyping system. The manufactured scaffolds were then washed out to form small pores on the surface in order to improve the scaffolds hydrophilicity. We analyzed the resultant material by using Scanning Electron Microscopy （SEM）, water absorption, water contact angle, in vitro WST-1, and the Bradford assay. Additionally, cells incubated on the fabricated scaffolds were visualized by Confocal Laser Scanning Microscopy （CLSM）. The developed scaffolds exhibited small pores on the strand surface which served to increase hydrophilicity as well as improve cellular proliferation and increase total protein content. Our findings suggest that the presence of small pores on the scaffolds can be used as an effective tool for improving implant cellular interaction. This research indicates that these modified scaffolds can be considered useful for bone tissue engineering applications to improve human health.

关键词： polycaprolactone polyethylene glycol polyblend 3D printing porosity bone tissue engineering

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MicroRNA miR-252-5p regulates the Notch signaling pathway by targeting Rab6 in Drosophila wing development

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Insect Science 2023年第5期30卷 1431-1444页

作者： Do-Hwan Lim min-seok Choi ji Won Jeon Young Sik Lee School of Systems Biomedical Science Soongsil UniversitySeoulRepublic of Korea College of Life Sciences and Biotechnology Korea UniversitySeoulRepublic of Korea Institute of Animal Molecular Biotechnology Korea UniversitySeoulRepublic of Korea

The Notch signaling pathway plays a central role in the development of various ***,dysregulation of microRNAs(miRNAs),which are crucial regulators of gene expression,can disrupt signaling pathways at all stages of *** Notch signaling is involved in wing development in Drosophila,the mechanism underlying miRNA-based regulation of the Notch signaling pathway is ***,we report that loss of Drosophila miR-252 increases the size of adult wings,whereas the overexpression of miR-252 in specific compartments of larval wing discs leads to patterning defects in the adult *** miR-252 overexpression-induced wing phenotypes were caused by aberrant Notch signaling with intracellular accumulation of the full-length Notch receptor during development,which could be due to defects in intracellular Notch trafficking associated with its recycling to the plasma membrane and autophagy-mediated ***,we identified Rab6 as a direct target of miR-252-5p;Rab6 encodes a small Ras-like GTPase that regulates endosomal trafficking *** with this finding,RNAi-mediated downregulation of Rab6 led to similar defects in both wing patterning and Notch ***,co-overexpression of Rab6 completely rescued the wing phenotype associated with miR-252 overexpression,further supporting that Rab6 is a biologically relevant target of miR-252-5p in the context of wing ***,our data indicate that the miR-252-5p-Rab6 regulatory axis is involved in Drosophila wing development by controlling the Notch signaling pathway.

关键词： Drosophila miR-252-5p Notch signaling Rab6 wing development

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Risks of non-conservative design according to ASME B31.1 for high-temperature piping subjected to long-term operation in the creep range

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Nuclear Science and Techniques 2019年第5期30卷 59-69页

作者： Hyeong-Yeon Lee seok-Kwon Son min-Gu Won ji-Young Jeong Korea Atomic Energy Research Institute National Fusion Research Institute School of Mechanical Engineering Sungkyunkwan University

This study investigates the risks of non-conservative piping design according to ASME B31.1 for hightemperature piping subjected to long-term operation at high temperature in a creep regime based on a sensitivity analysis of the hold time. Design evaluations of hightemperature piping were conducted over a range of hold times in the creep regime according to ASME B31.1,which implicitly considers the creep effects, and the French high-temperature design code of the RCC-MRx, which explicitly considers the creep effects. Conservatisms were quantified among the codes in terms of the hold times. In the case of B31.1, the design evaluation results do not change depending on the hold time at high temperature,whereas in the case of RCC-MRx, they do. It was shown that the design limits of RCC-MRx were exceeded when the hold time exceeded certain values, whereas those of B31.1 were satisfied regardless of the hold times. Thus, the design evaluations according to B31.1 did not consistently yield conservative results and might lead to non-conservative results in the case of long-term operations in the creep range.

关键词： ASME B31.1 Creep Hold time Hightemperature piping RCC-MRx Sensitivity analysis

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Projective Dirichlet Boundary Condition with Applications to a Geometric Problem

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Acta Mathematica Sinica,English Series 2016年第1期32卷 11-24页

作者： min ji Academy of Mathematics and Systems Science Chinese Academy of Sciences

Given a domain Ω R^n, let λ 〉 0 be an eigenvalue of the elliptic operator L ：= ∑i,j^n= 1δ/δxi on Ω for Dirichlet condition. For a function f ∈ L2（Ω）, it is known that the linear resonance equation Lu ＋ λu = f in Ω with Dirichlet boundary condition is not always solvable. We give a new boundary condition Pλ（u｜δΩ） = g, called to be projective Dirichlet condition, such that the linear resonance equation always admits a unique solution u being orthogonal to all of the eigenfunctions corresponding to λ which satisfies ｜｜u｜｜2,2 ≤ C（｜｜f｜｜2 ＋｜｜g｜｜2,2） under suitable regularity assumptions on δΩ and L, where C is a constant depends only on n, Ω, and L. More a priori estimates, such as W^2~＇P-estimates and the C^2,α-estimates etc., are given also. This boundary condition can be viewed as a generalization of the Dirichlet condition to resonance equations and shows its advantage when applying to nonlinear resonance equations. In particular, this enables us to find the new indicatrices with vanishing mean （Cartan） torsion in minkowski geometry. It is known that the geometry of indicatries is the foundation of Finsler geometry.

关键词： Elliptic resonance equation nonlinear boundary condition convex indicatrix mean tor-sion

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Critical role of corrosion inhibitors modified by silyl ether functional groups on electrochemical performances of lithium manganese oxides

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Journal of Energy Chemistry 2020年第12期29卷 425-433页

作者： min ji Seong Taeeun Yim Department of Chemistry Incheon National UniversityYeonsu-gu 22012IncheonRepublic of Korea Research Institute of Basic Sciences College of Natural ScienceIncheon National UniversityYeonsu-gu 22012IncheonRepublic of Korea

Lithium manganese oxides(Li Mn2 O4, LMO) have attracted significant attention as important cathode materials for lithium-ion batteries(LIBs), which require fast charging based on their intrinsic electrochemical properties. However, these properties are limited by the rapid fading of cycling retention, particularly at high temperatures, because of the severe Mn corrosion triggered by the chemical reaction with fluoride(F-) species existing in the cell. To alleviate this issue, three types of silyl ether(Si–O)-functionalized task-specific additives are proposed, namely methoxytrimethylsilane, dimethoxydimethylsilane, and trimethoxymethylsilane. Ex-situ NMR analyses demonstrated that the Si-additives selectively scavenged the F-species as Si forms new chemical bonds with F via a nucleophilic substitution reaction due to the high binding affinity of Si with F-, thereby leading to a decrease in the F concentration in the cell. Furthermore, the addition of Si-additives in the electrolyte did not significantly affect the ionic conductivity or electrochemical stability of the electrolyte, indicating that these additives are compatible with conventional electrolytes. In addition, the cells cycled with Si-additives exhibited improved cycling retention at room temperature and 45 °C. Among these candidates, a combination of MTSi and the LMO cathode was found to be the most suitable choice in terms of cycling retention(71.0%), whereas the cell cycled with the standard electrolyte suffered from the fading of cycling retention triggered by Mn dissolution(64.4%). Additional ex-situ analyses of the cycled electrodes using SEM, TEM, EIS, XPS, and ICP-MS demonstrated that the use of Si-additives not only improved the surface stability of the LMO cathode but also that of the graphite anode, as the Si-additives prevent Mn corrosion. This inhibits the formation of cracks on the surface of the LMO cathode, facilitating the formation of a stable solid electrolyte interphase layer on the su

关键词： Lithium-ion batteries Lithium manganese oxide cathode Electrolyte additive Corrosion Silyl ether Fluoride scavenger

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Wire-Shaped 3D-Hybrid Supercapacitors as Substitutes for Batteries

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Nano-Micro Letters 2020年第2期12卷 211-223页

作者： Kyeong‑Nam Kang Ananthakumar Ramadoss jin‑Wook min Jong‑Chul Yoon Deokjung Lee seok Ju Kang ji‑Hyun Jang School of Energy and Chemical Engineering Low Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Laboratory for Advanced Research in Polymeric Materials Central Institute of Plastic Engineering and TechnologyBhubaneswar 751024India School of Mechanical Aerospace and Nuclear EngineeringUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea

We report a wire-shaped three-dimensional(3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites,easy access of electrolyte ions,and facile charge transport for flexible wearable *** interconnected and compact electrode delivers a high volumetric capacitance(gravimetric capacitance)of 73 F cm−3(2446 F g−1),excellent rate capability,and cycle *** 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire(NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire(Mn3O4/3D-Ni)hybrid supercapacitor exhibits energy density of 153.3 Wh kg−1 and power density of 8810 W kg−*** red lightemitting diode powered by the as-prepared hybrid supercapacitor can operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation *** results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge–discharge times,for smart wearable and implantable devices.

关键词： Three-dimensional(3D)metal current collector Flexible hybrid supercapacitor Wire-shaped supercapacitor High energy density device Fast charging energy storage system

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Effects of different Ca^(2+) behavior patterns in the electric field on membrane fouling formation and removal of trace organic compounds

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Journal of Environmental Sciences 2022年第1期34卷 292-300页

作者： Zhen Du min ji Ruying Li School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China

The effects of Ca^(2+) on membrane fouling and trace organic compounds(TrOCs)removal in an electric field-assisted microfiltration system were investigated in the presence of Na^(+) alone for *** the electric field,negatively charged bovine serum albumin(BSA)migrated towards the anode far away from the membrane surface,resulting in a 42.9%transmembrane pressure(TMP)reduction in the presence of Na^(+) at 1.5 *** contrast,because of the stronger charge shielding of Ca^(2+),the electrophoretic migration of BSA was limited and led to a neglectable effect of the electric field(1.5 V)on membrane ***,under 3 V applied voltage,the synergistic effects of electrochemical oxidation and bridging interaction between Ca^(2+) and BSA promoted the formation of denser settleable flocs and a thinner porous cake layer,which alleviated membrane fouling with a 64.5%decrease in TMP and nearly 100%BSA *** Tr OCs elimination increased with voltage and reached29.4%–80.4%at 3 *** electric field could prolong the contact between Tr OCs and strong oxidants generated on the anode,which enhanced the Tr OCs ***,a stronger charge shielding ability of Ca^(2+) weakened the electric field force and thus lowered the Tr OCs removal.

关键词： Electric field Membrane fouling Ca^(2+) Flocs formation Trace organic compounds

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Elucidating Ion Transport Phenomena in Sulfide/Polymer Composite Electrolytes for Practical Solid-State Batteries

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Nano-Micro Letters 2023年第10期15卷 416-432页

作者： Kyeong‑seok Oh ji Eun Lee Yong‑Hyeok Lee Yi‑Su Jeong Imanuel Kristanto Hong‑seok min Sang‑Mo Kim Young Jun Hong Sang Kyu Kwak Sang‑Young Lee Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei‑roSeodaemun‑guSeoul 03722Republic of Korea Department of Chemical and Biological Engineering Korea University145 Anam‑roSeongbuk‑guSeoul 02841Republic of Korea School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)50 UNIST‑gilEonyang‑eupUlju‑gunUlsan 44919Republic of Korea Hyundai Motor Company 150Hyundaiyeonguso‑roNamyang‑eupHwaseong‑siGyeonggi‑do 18280Republic of Korea

Despite the enormous interest in inorganic/polymer composite solid-state electrolytes(CSEs)for solid-state batteries(SSBs),the underlying ion transport phenomena in CSEs have not yet been ***,we address this issue by formulating a mechanistic understanding of bi-percolating ion channels formation and ion conduction across inorganic-polymer electrolyte interfaces in CSEs.A model CSE is composed of argyrodite-type Li_6PS_5Cl(LPSCl)and gel polymer electrolyte(GPE,including Li~+-glyme complex as an ion-conducting medium).The percolation threshold of the LPSCl phase in the CSE strongly depends on the elasticity of the GPE ***,manipulating the solvation/desolvation behavior of the Li~+-glyme complex in the GPE facilitates ion conduction across the LPSCl-GPE *** resulting scalable CSE(area=8×6(cm×cm),thickness~40μm)can be assembled with a high-mass-loading LiNi_(0.7)Co_(0.15)Mn_(0.15)O_(2)cathode(areal-mass-loading=39 mg cm~(-2))and a graphite anode(negative(N)/positive(P)capacity ratio=1.1)in order to fabricate an SSB full cell with bi-cell *** this constrained cell condition,the SSB full cell exhibits high volumetric energy density(480 Wh L_(cell)~(-1))and stable cyclability at 25℃,far exceeding the values reported by previous CSE-based SSBs.

关键词： Solid-state batteries Composite solid-state electrolytes Ion transport phenomena Bi-percolating ion channels Interfacial resistance

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Nickel-carbonate nanowire array： An efficient and durable electrocatalyst for water oxidation under nearly neutral conditions

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 467-472页

作者： Yuyao ji min Ma Xuqiang ji Xiaoli Xiong Xuping Sun College of Chemistry and Materials Science Sichuan Normal University Chengdu 610068 China College of Chemistry Sichuan University Chengdu 610064 China Key Lab of Process Analysis and Cont ol of Sichuan Universities Yibin University Yibin 644000 China

It is highly attractive but still remains a great challenge to develop an efficient electrocatalyst for oxygen evolution reaction under nearly neutral conditions. In this work, we report the transformation of Ni3S2 nanowire array on nickel foam into the amorphous nickel carbonate nanowire array on nickel foam （NiCO3/NF）. The resulting NiCO3/NF shows high electrocatalytic activity towards water oxidation and affords current density of 50 mA. cm-2 at overpotential of 395 mV in 1.0 mol·L^-1 KHCO3. Moreover, this NiCO3/NF is also durable with a long-term electrochemical durability of 60 h. This catalyst electrode achieves a high turnover frequency of 0.21 mol O2·s^-1 at the overpotential of 500 mV.

关键词： water oxidation NiCO3/NF nearly neutral conditions superior activity electocatalyst

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Synthesis and Crystal Structure of Co(DMSO)_2(H_2O)_2(SCN)_2 with One-dimensional Hydrogen-bonded Structure (DMSO = Dimethylsulfoxide)

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Chinese Journal of Structural Chemistry 2006年第6期25卷 643-646页

作者： WEI Rong-min CHE Yun-Xia ZHENG ji-min Departmentof Biology Chemistry Tianjin Normal University Tianjin 300071 China

The title complex Co（DMSO）2（H2O）2（SCN）2 has been prepared and structurally characterized. It crystallizes in monoclinic, space group P21/n with a= 5.1981（9）, b = 11.944（2）, c = 12.646（2） A,β = 98.686（2）°, V = 776.2（2） A^3, C6H16CoN2O4S4, Mr = 367.38, Z = 2, De = 1.572 g/cm^3, F（000） = 378 and μ（MoKa） = 1.646 mm^-1. The structure was refined to R= 0.0232 and wR = 0.0645 for 1241 observed reflections with I 〉 2σ（I）. In the title complex, each Co（II） atom is octahedrally coordinated by four O atoms from two DMSO ligands and two water molecules as well as two N atoms from SCN^- ions. The title molecules are connected to each other through intermolecular hydrogen bonds to form a 1-D structure extended by eight-membered Co2O4H2 rings.

关键词： dimethylsulfoxide thiocyanate group supramolecule,complex intermolecular hydrogen bond

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