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Electric-field-controlled highly regioselective thiocyanation of n-containing heterocycles

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Science china chemistry 2024年第4期67卷 1263-1269页

作者： Ming Gong Qian Wu Jung Keun kim Mengmeng Huang Yabo Li Yangjie Wu Jong Seung kim Henan Key Laboratory of chemical biology and Organic chemistry Key Laboratory of Applied Chemistry of Henan UniversitiesCollege of ChemistryZhengzhou UniversityZhengzhou 450052China Department of chemistry Korea UniversitySeoul 02841Korea

Achieving highly regioselective synthesis in organic chemistry is challenging due to the uncontrollable orientation between reacting *** electric fields(EEFs)can influence the reactivity and selectivity of the substrate by causing directional ***,scalable and efficient techniques for using EEFs as“smart catalysts”have been lacking,hindering their *** this study,we present a novel method for modifying the regioselectivity of quinoxaline-2(1H)-ones by functionalizing their c7-position using the electric double layer(EDL)*** approach led to moderate to good yields of the corresponding c7-thiocyanation *** calculations and control experiments demonstrated that EEFs could reverse the regioselectivity of quinoxaline-2(1H)-ones,allowing the c7-thiocyanation to proceed via a radical reaction ***,the resulting 7-thiocyano-1-methylquinoxaline-2(1H)-ones exhibited promising AIE *** work showcases a promising strategy for achieving highly regioselective functionalization by aligning the electric field with the desired reaction/bond axis.

关键词： electric fields reaction-axis rule electric double layer c7-thiocyanation c-S bond formation

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neural Wiskott-Aldrich syndrome protein(n-WASP)promotes distant metastasis in pancreatic ductal adenocarcinoma via activation of LOXL2

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Oncology Research 2024年第4期32卷 615-624页

作者： HYUnG SUn kim YUn SUn LEE SEUnG MYUnG DOnG HYO JUnG kim DA EUn LEE HYEOn WOOnG KAnG MYEOnG JIn kim JOOn SEOnG PARK Department of Surgery Gangnam Severance HospitalYonsei University College of MedicineSeoulKorea Department of Surgery Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of MedicineSeoulKorea Gibiome co. Ltd.Gyeonggi-doKorea

Pancreatic ductal adenocarcinoma(PDAc)is one of the most aggressive solid malignancies.A specific mechanism of its metastasis has not been *** this study,we investigated whether neural Wiskott-Aldrich syndrome protein(n-WASP)plays a role in distant metastasis of *** found that n-WASP is markedly expressed in clinical patients with *** analysis showed a notably more distant metastatic pattern in the n-WASP-high group compared to the n-WASP-low group.n-WASP was noted to be a novel mediator of epithelialmesenchymal transition(EMT)via gene expression profile *** of n-WASP in pancreatic cancer cells significantly inhibited cell invasion,migration,and *** also observed positive association of lysyl oxidase-like 2(LOXL2)and focal adhesion kinase(FAK)with the n-WASP-mediated response,wherein EMT and invadopodia function were *** n-WASP and LOXL2 depletion significantly reduced the incidence of liver and lung metastatic lesions in orthotopic mouse models of pancreatic *** results elucidate a novel role for n-WASP signaling associated with LOXL2 in EMT and invadopodia function,with respect to regulation of intercellular communication in tumor cells for promoting pancreatic cancer *** findings may aid in the development of therapeutic strategies against pancreatic cancer.

关键词： Pancreatic cancer neural Wiskott-Aldrich syndrome protein(n-WASP)signaling Metastasis Epithelial-mesenchymal transition(EMT) Lysyl oxidase-like 2(LOXL2)

Functionally graded structure of a nitride-strengthened Mg_(2)Si-based hybrid composite

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Journal of Magnesium and Alloys 2024年第3期12卷 1239-1256页

作者： Jeongho Yang Woongbeom Heogh Hogi Ju Sukhyun Kang Tae-Sik Jang Hyun-Do Jung Mohammad Jahazi Seung chul Han Seong Je Park Hyoung Seop kim Susmita bose Amit bandyopadhyay Martin byung-Guk Jun Young Won kim Dae-kyeom kim Rigoberto cAdvincula clodualdo Aranas Jr Sang Hoon kim School of Mechanical Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Mechanical Design Engineering Hanyang UniversitySeoul 04763Republic of Korea Process Research 3 Team LG Display Co.Ltd.PajuGyeonggi-do 10845Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju 61452Republic of Korea Institute of Well-Aging Medicare&chosun University LAMP center Chosun UniversityGwangju 61452Republic of Korea Division of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea Department of Mechanical Engineering École de Technologie SupérieureMontrealQuebec H3C 1K3Canada Material&component convergence R&D center Korea Construction Equipment Technology InstituteGunsanJeollabuk-do 54002Republic of Korea School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Graduate Institute of Ferrous&Eco Materials Technology Pohang University of Science and TechnologyPohangGyeongsangbuk-do 37673Republic of Korea Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Institute for convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea School of Mechanical and Materials Engineering Washington State UniversityPullmanWashington 99164USA School of Mechanical Engineering Purdue UniversityWest LafayetteIndiana 47907USA Research Institute of Advanced Manufacturing Technology Korea Institute of Industrial TechnologyIncheon 21999Republic of Korea Department of Macromolecular Science and Engineering Case Western Reserve UniversityClevelandOhio 44106USA Department of chemical and biomolecular Engineering and Joint Institute for Advanced Materials University of TennesseeKnoxvilleTennessee 37996USA center for nanophase Materials and Sciences Oak Ridge National LaboratoryOak RidgeTennessee 37830USA Department of Mechanical Engineering University of New BrunswickFrederictonNew Brunswick E3B 5A3Cana

The ex-situ incorporation of the secondary Sic reinforcement,along with the in-situ incorporation of the tertiary and quaternary Mg_(3)n_(2) and Si_(3)n_(4) phases,in the primary matrix of Mg_(2)Si is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of n_(2) gas during laser powder bed *** is substantialized based on both the thermal diffusion-and chemical reactionbased metallurgy of the Mg_(2)Si–Sic/nitride hybrid *** study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive *** strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the Mg_(2)Si–Sic/nitride hybrid ***,the coefficient of friction of the hybrid composite exhibits a 309.3%decrease to–1.67 compared to–0.54 for the conventional nonreinforced Mg_(2)Si structure,while the tensile strength exhibits a 171.3%increase to 831.5 MPa compared to 485.3 MPa for the conventional *** outstanding mechanical behavior is due to the(1)the complementary and synergistic reinforcement effects of the Sic and nitride compounds,each of which possesses an intrinsically high hardness,and(2)the strong adhesion of these compounds to the Mg_(2)Si matrix despite their small sizes and low concentrations.

关键词： Laser powder bed fusion Mg_(2)Si-Sic/nitride hybrid composite both the thermal diffusion-and chemical reaction-based metallurgy Functionally graded structure compositional gradient Wear resistance.

On von neumann Regularity of commutators

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Algebra colloquium 2024年第2期31卷 181-198页

作者： nam Kyun kim Tai Keun Kwak Yang Lee Sung Ju Ryu nanqing Ding School of basic Sciences Hanbat National UniversityDaejeon 34158Korea Department of Data Science Daejin UniversityPocheon 11159Korea Department of Mathematics Yanbian UniversityYanjiJilin 133002China Institute for Applied Mathematics and Optics Hanbat National University Daejeon 34158Korea Department of Mathematics Pusan National UniversityBusan 46241Korea 不详

We study the structure of rings which satisfy the von neumann regularity of commutators,and call a ring R c-regularif ab-ba ∈(ab-ba)R(ab-ba)for all a,b in *** a c-regular ring R,we prove J(R[X])=n^(*)(R[X])=n^(*)(R)[X]=W(R)[X]■Z(R[X]),where J(A),n^(*)(A),W(A),Z(A)are the Jacobson radical,upper nilradical,Wedderburn radical,and center of a given ring A,respectively,and A[X]denotes the polynomial ring with a set X of commuting indeterminates over A;we also prove that R is semiprime if and only if the right(left)singular ideal of R is *** provide methods to construct c-regular rings which are neither commutative nor von neumann regular,from any given ***,for a c-regular ring R,the following are proved to be equivalent:(i)R is Abelian;(ii)every prime factor ring of R is a duo domain;(ii)R is quasi-duo;and(iv)R/W(R)is reduced.

关键词： c-regular ring commutator regular ring commutative ring radical singular ideal

Highly enhanced UV absorption and light emission of monolayer WS_(2)through hybridization with Ti_(2)n MXene quantum dots and g-c_(3)n_(4)quantum dots

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Opto-Electronic Advances 2024年第6期7卷 31-39页

作者： Anir S.Sharbirin Rebekah E.Kong Wendy b.Mato Trang Thu Tran Eunji Lee Jolene W.P.Khor Afrizal L.Fadli Jeongyong kim Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea

Two-dimensional(2D)transition metal dichalcogenides(TMD)are atomically thin semiconductors with promising optoelectronic applications across the visible ***,their intrinsically weak light absorption and the low photoluminescence quantum yield(PLQY)restrict their performance and potential use,especially in ultraviolet(UV)wavelength light *** dots(QD)derived from 2D materials(2D/QD)provide efficient light absorption and emission of which energy can be tuned for desirable light *** this study,we greatly enhanced the photon absorption and PLQY of monolayer(1L)tungsten disulfide(WS_(2))in the UV range via hybridization with 2D/QD,particularly titanium nitride MXene QD(Ti_(2)n MQD)and graphitic carbon nitride QD(GcnQD).With the hybridization of MQD or GcnQD,1LWS_(2)showed a maximum PL enhancement by 15 times with 300 nm wavelength excitation,while no noticeable enhancement was observed when the excitation photon energy was less than the bandgap of the QD,indicating that UV absorption by the QD played a crucial role in enhancing the light emission of 1L-WS_(2)in our 0D/2D hybrid *** findings present a convenient method for enhancing the photo-response of 1L-WS_(2)to UV light and offer exciting possibilities for harvesting UV energy using 1L-TMD.

关键词： monolayer TMD WS_(2) 2D-derived quantum dots UV absorption energy transfer

High na-ion conductivity andmechanical integrity of anion-exchanged polymeric hydrogel electrolytes for flexible sodium ion hybrid energy storage

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SusMat 2024年第1期4卷 140-153页

作者： JungWoo Hong Harpalsinh H.Rana Jeong Hee Park Jun Su kim Sang Joon Lee Gun Jang Tae Hoon Kang Kang Ho Shin Sang Ha baek Wooseok Yang Kwang Ho kim Ju-Hyuk Lee Ho Seok Park School of chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea clean Energy Research center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea KIST-SKKU carbon-neutral Research center Sungkyunkwan University(SKKU)SuwonRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea cOSMOS LAb/92 Jomaru-ro 385beon-gilBucheon-siRepublic of Korea SKKU Advanced Institute of nano Technology(SAInT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

The polymeric gel electrolytes are attractive owing to their higher ionic conductivities than those of dry polymer electrolytes and lowered water activity for enlarged potential ***,the ionic conductivity and mechanical strength of the na-ion conducting polymeric gel electrolytes are limited by below 20 mS cm−1 and 2.2 ***,we demonstrate na-ion conducting and flexible polymeric hydrogel electrolytes of the chemically coupled poly(diallyldimethylammonium chloride)-dextrin-n,n′-methylene-bisacrylamide film immersed in naclO_(4) solution(ex-DDA-Dex+naclO_(4))for flexible sodium-ion hybrid capacitors(f-nIHc).In particular,the anion exchange reaction and synergistic interaction of ex-DDA-Dex with the optimum clO_(4)−enable to greatly improve the ionic conductivity up to 27.63 mS cm−1 at 25◦c and electrochemical stability window up to 2.6 V,whereas the double networking structure leads to achieve both the mechanical strength(7.48 MPa)and softness of hydrogel ***,the f-nIHcs with the ex-DDA-Dex+naclO_(4) achieved high specific and high-rate capacities of 192.04 F g^(−1)at 500 mA g^(−1)and 116.06 F g^(−1)at 10000 mA g^(−1),respectively,delivering a large energy density of 120.03Wh kg^(−1)at 906Wkg^(−1)and long cyclability of 70%over 500 cycles as well as demonstrating functional operation under mechanical stresses.

关键词： anion exchange chemistry flexible energy storage hybrid energy storage hydrogel electrolytes renewable electrolytes sodium storage

Two distinct subpopulations of marginal zone b cells exhibit differential antibody-producing capacities and radioresistance

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cellular & Molecular Immunology 2024年第4期21卷 393-408页

作者： Sujin Lee Yeunjung Ko Hyun Woo Lee Won Joon Oh Hun Gi Hong Dinuka Ariyaratne Se Jin Im Tae Jin kim Department of Immunology Graduate School of Basic Medical ScienceSungkyunkwan University School of MedicineSuwon16419Republic of Korea Department of Immunology and Molecular Medicine Faculty of Medical SciencesUniversity of Sri JayewardenepuraNugegodaSri Lanka Present address:Immunology and Microbiology Graduate Program Baylor College of MedicineHoustonTX77030USA

Marginal zone(MZ)b cells,which are splenic innate-like b cells that rapidly secrete antibodies(Abs)against blood-borne pathogens,are composed of heterogeneous ***,we showed that MZ b cells can be divided into two distinct subpopulations according to their cD80 expression ***80^(high)MZ b cells exhibited greater Ab-producing,proliferative,and IL-10-secreting capacities than did cD80^(low)MZ b ***,cD80^(high)MZ b cells survived 2-Gy whole-body irradiation,whereas cD80^(low)MZ b cells were depleted by irradiation and then repleted with one month after *** of cD80^(low)MZ b cells led to accelerated development of type II collagen(cII)-induced arthritis upon immunization with bovine ***80^(high)MZ b cells exhibited higher expression of genes involved in proliferation,plasma cell differentiation,and the antioxidant ***80^(high)MZ b cells expressed more autoreactive b cell receptors(bcRs)that recognized double-stranded DnA or cII,expressed more immunoglobulin heavy chain sequences with shorter complementarity-determining region 3 sequences,and included more clonotypes with no n-nucleotides or with b-1a bcR sequences than cD80^(low)MZ b *** transfer experiments showed that cD21^(+)cD23^(+)transitional 2 MZ precursors preferentially generated cD80^(low)MZ b cells and that a proportion of cD80^(low)MZ b cells were converted into cD80^(high)MZ b cells;in contrast,cD80^(high)MZ b cells stably remained cD80^(high)MZ b *** summary,MZ b cells can be divided into two subpopulations according to their cD80 expression levels,Ab-producing capacity,radioresistance,and autoreactivity,and these findings may suggest a hierarchical composition of MZ b cells with differential stability and bcR specificity.

关键词： Marginal Zone b cell cD80 Autoreactivity Radioresistance

Trifunctional robust electrocatalysts based on 3D Fe/n-doped carbon nanocubes encapsulating co4n nanoparticles for efficient battery-powered water electrolyzers

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carbon Energy 2024年第6期6卷 124-139页

作者： Hyung Wook choi Hongdae Lee Jun Lu Seok bin Kwon Dong In Jeong beum Jin Park Jiwon kim bong Kyun Kang Gun Jang Dae Ho Yoon Ho Seok Park SKKU Advanced Institute of nano Technology(SAInT) Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea School of chemical Engineering Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea Department of Electronic Materials Devicesand Equipment EngineeringSoonchunhyang UniversityAsan CityChungnamRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon-siGyeonggi-doRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

Herein,we have designed a highly active and robust trifunctional electrocatalyst derived from Prussian blue analogs,where co_(4)n nanoparticles are encapsulated by Fe embedded in n-doped carbon nanocubes to synthesize hierarchically structured co_(4)n@Fe/n-c for rechargeable zinc-air batteries and overall water-splitting *** confirmed by theoretical and experimental results,the high intrinsic oxygen reduction reaction,oxygen evolution reaction,and hydrogen evolution reaction activities of co_(4)n@Fe/n-c were attributed to the formation of the heterointerface and the modulated local electronic ***,co_(4)n@Fe/n-c induced improvement in these trifunctional electrocatalytic activities owing to the hierarchical hollow nanocube structure,uniform distribution of co_(4)n,and conductive encapsulation by Fe/***,the rechargeable zinc-air battery with co_(4)n@Fe/n-c delivers a high specific capacity of 789.9 mAh g-1 and stable voltage profiles over 500 ***,the overall water electrolyzer with co_(4)n@Fe/n-c achieved better durability and rate performance than that with the Pt/c and IrO2 catalysts,delivering a high Faradaic efficiency of 96.4%.Along with the great potential of the integrated water electrolyzer powered by a zinc-air battery for practical applications,therefore,the mechanistic understanding and active site identification provide valuable insights into the rational design of advanced multifunctional electrocatalysts for energy storage and conversion.

关键词： battery-powered electrolyzers hierarchical structure Prussian blue analog trifunctional electrocatalyst zinc-air battery

氮掺杂对环境空气中TiO_(2)纳米催化剂抗甲醛光催化矿化的影响

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chinese Journal of catalysis 2024年第4期59卷 303-323页

作者： Dae-Hwan Lim Aadil bathla Hassan Anwer Sherif AYounis Danil Wboukhvalov Ki-Hyun kim 汉阳大学土木与环境工程系韩国首尔国立科技大学环境工程系巴基斯坦伊斯兰堡埃及石油研究所分析与评估部埃及开罗南京林业大学材料物理与化学研究所理学院江苏南京乌拉尔联邦大学物理与技术研究所俄罗斯叶卡捷琳堡

通过氮掺杂TiO_(2)(n-TiO_(2))浸渍蜂窝过滤器构建了一系列原型光催化空气净化器(AP(n_(x)-c_(y)))系统,并用于在UV-LED光(1 W)照射条件下光催化分解0.5-5 ppm甲醛(cH_(2)O)蒸汽.在上述催化过滤器系统中,nx和cy分别代表n/Ti摩尔比(0-20)... 详细信息

通过氮掺杂TiO_(2)(n-TiO_(2))浸渍蜂窝过滤器构建了一系列原型光催化空气净化器(AP(n_(x)-c_(y)))系统,并用于在UV-LED光(1 W)照射条件下光催化分解0.5-5 ppm甲醛(cH_(2)O)蒸汽.在上述催化过滤器系统中,nx和cy分别代表n/Ti摩尔比(0-20)和n-TiO_(2)浓度(2-20 mg mL^(-1)).光催化分解实验结果表明,AP(n_(10)-c_(10))的性能最好,其催化cH2O转化为cO_(2)的转化率最高,循环反应10次后cO_(2)产率仍达到89.2%,在干燥空气中的清洁空气输送速率为9.45 L min^(-1).n10-c10的电荷载流子寿命(τa:1.70 ns)优于其他样品(如纯TiO_(2)的电荷载流子寿命为1.37 ns),这表明n缺陷(no)有助于降低带隙(3.10 eV)和产生氧空位OVs-Ti^(3+),这与密度泛函理论(DFT)模拟结果一致.采用原位漫反射红外傅里叶变换、电子顺磁共振和DFT分析等多种方法研究了cH_(2)O的光催化氧化途径.结果表明,氧化过程涉及多个能量有利的中间步骤(例如cH2O以cH_(2)O_(2)的形式在TiO_(2)-OV{110}表面的桥连O/OH基团上发生放热共价吸附,随后通过催化脱氢/氧化反应直接生成cO_(2):cH_(2)O_(2)/HcOO^(-)+•OH→H_(2)O+cO_(2)).这些步骤与具有n杂质的{101}表面上化学活性Ti原子的态密度计算结果一致.预计no缺陷和OVs的存在将通过降低活化能垒来影响反应能量和中间产物,从而在加湿条件下实现有效的矿化.综上,本文为设计和构建先进的光催化系统,并用于环境空气中醛类挥发性有机物(VOcs)的有效矿化提供了新思路.

关键词：光催化蜂窝过滤器甲醛氮掺杂TiO_(2) 密度泛函理论计算催化反应途径空气净化