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Surface reconstruction of heterostructures in alkaline m.dium.towards enhanced electrocatalytic hydrogen evolution

Rare m.tals 2024年第6期43卷 2636-2647页

作者： m.ng-Yang Yang Ji Yuan Xue-Lian Fu jing-jing Chen jing Hu Zhou-Guang Lu Chen Liu Guangdong Research Center for Interfacial Engineering of Functional m.terials Shenzhen Key Laboratory of Polymer Science and TechnologyShenzhen Key Laboratory of Energy Electrocatalytic MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Interfacial Science and Engineering of m.terials Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Constructing heterostructures has proved to be a successful strategy to fabricate electrocatalysts with high efficiency for water ***,the structure evolution in alkaline hydrogen evolution reaction lacks investigation and the specific active center rem.ins ***,we take the well-designed Ni_(3)S_(2)@VO_(2) heterostructures as a m.del to investigate the electrocatalytic activity and the surface reconstruction process of heterostructure catalysts in alkaline *** Ni_(3)S_(2)@VO_(2) heterostructures,with Ni_(3)S_(2) nanorods as the core and VO_(2) nanoflakes as the shell,coupled with the high conductive Ni_(3)S_(2),the hydrophilic VO_(2) and m.dulated electronic structures at the interfaces,exhibited prom.nent activity and superior stability at various current ***,the ex-situ characterizations confirm.d that the surface reconstruction from.Ni_(3)S_(2)@VO_(2) into Ni_(3)S_(2)@am.rphous-Ni(OH)_(2) in alkaline m.dia could optim.ze the water dissociation barrier and exposed large active area,thereby contributing to im.roved electrocatalytic *** study not only introduces novel high-perform.nce electrocatalysts for hydrogen evolution reaction(HER),but also provides a new avenue for re-exam.ning hetero-structural catalysts in alkaline solutions.

关键词： Heterostructures Ni_(3)S_(2)@VO_(2) Surface reconstruction Water dissociation Alkaline hydrogen evolution

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m.chanically driven assem.ly of biom.m.tic 2D-m.terial m.crotextures with bioinspired m.ltifunctionality

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Nano Research 2024年第2期17卷 663-678页

作者： Yang Li Lin jing Joshua m.Little Haochen Yang Tsai-Chun Chung Po-Yen Chen Departm.nt of Chem.cal and Biom.lecular Engineering University of MarylandCollege ParkMD 20740USA m.ryland Robotics Center University of MarylandCollege ParkMD 20742USA School of m.terials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Nature provides a wealth of bio-inspiration for advanced m.terial *** various nanom.terials into biom.m.tic m.crotextures with bioinspired functionalities has spurred increasing research interests and facilitated technological advances in various *** recent years,two-dim.nsional m.terials(2Dm.)have em.rged as im.ortant building block units in the biom.m.cry field due to their distinct chem.cal,physical,electrical,electrochem.cal,and catalytic *** this review article,various m.chanically driven assem.ly approaches are sum.arized to fabricate various genealogies of biom.m.tic 2Dm.m.crotextures with bio-inspired ***,sequential deform.tion strategies are discussed to program.ably construct higher dim.nsional 2Dm.m.crotextures,ranging from.wrinkles/crum.les(one-tim. deform.tion)to m.ltiscale hierarchies(m.ltiple deform.tions).Next,the current progress using higher dim.nsional 2Dm.m.crotextures to im.tate different biological structures and/or induce bio-inspired m.ltifunctionality is system.tically *** showcases of bio-inspiration and biom.m.cry using different 2Dm.nanosheets are highlighted:(1)wrinkle patterns of an earthworm.that spur the design of strain sensors with program.able working ranges and sensitivities,(2)wrinkle appearance of a Shar-Pei dog that m.tivates the fabrication of stretchable energy storage devices,(3)hierarchical scale textures of a desert lizard that inspire cation-induced gelation platform. for 2Dm.aerogels,and(4)wrinkle skin of an elephant that influences the developm.nt of 2Dm.protective skin for soft ***,challenges and future opportunities of adopting 2Dm.nanosheets to assem.le biom.m.tic m.crostructures with synergistic functionalities are discussed.

关键词： two-dim.nsional(2D)m.terials m.chanically driven assem.ly biom.m.tic m.crotextures functional nanocom.osite bio-inspired m.ltifunctionality

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Two m.trix Theorem. Arising from.Nilpotent Groups

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Algebra Colloquium 2024年第3期31卷 499-504页

作者： jing Zhao Heguo Liu School of m.them.tics and Statistics Hainan University Haikou 570228China

For a nilpotent group G without π-torsion,and x,y ∈ G,if x^(n)=y^(n) for a T-num.er n,then x=y;if x^(m.y^(n)=y^(n)x^(m. for n-num.ers m.n,then xy=*** is a wellknown result in group *** this paper,we prove two analogous theorem. on m.trices,which have independence ***,let m.be a given positive integer and A a com.lex square m.trix satisfying that(i)all eigenvalues of A are nonnegative,and(i)rank A^(2)=rank A;then A has a unique m.th root X with rank X^(2)=rank X,all eigenvalues of X are nonnegative,and m.reover there is a polynom.al f(λ)with X=f(A).In addition,let A and B be com.lex n×n m.trices with all eigenvalues nonnegative,and rank A^(2)=rank A,rank B^(2)=rank B;then(i)A=B when A^(r)=B^(r) for som. positive integer r,and(i)AB=BA when A^(s)B^(t)=B^(t)A^(s) for two positive integers s and t.

关键词： nilpotent group root m.trix Chinese rem.inder theorem

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Two intestinal m.crobiota-derived m.tabolites, deoxycholic acid and butyrate, synergize to enhance host defense peptide synthesis and alleviate necrotic enteritis

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Journal of Anim.l Science and Biotechnology 2024年第3期15卷 1158-1172页

作者： Dohyung m.Kim.jing Liu m.lanie A.Whitm.re Isabel Tobin Zijun Zhao Guolong Zhang Departm.nt of Anim.l and Food Sciences Oklahoma State UniversityStillwaterOKUSA

Background Necrotic enteritis(NE)is a m.jor enteric disease in poultry,yet effective m.tigation strategies rem.in *** acid(DCA)and butyrate,two m.jor m.tabolites derived from.the intestinal m.crobiota,have independently been shown to induce host defense peptide(HDP)***,the potential synergy between these two com.ounds rem.ins *** To investigate the possible synergistic effect between DCA and butyrate in regulating HDP synthesis and barrier function,we treated chicken HD11 m.crophage cells and jejunal explants with DCA and sodium.butyrate(NaB),either individually or in com.ination,for 24 ***,we perform.d RNA isolation and reverse transcrip-tion-quantitative PCR to analyze HDP genes as well as the m.jor genes associated with barrier *** further determ.ne the synergy between DCA and NaB in enhancing NE resistance,we conducted two independent trials with Cobb broiler *** each trial,the diet was supplem.nted with DCA or NaB on the day-of-hatch,followed by NE induction through sequential challenges with Eim.ria m.xim. and Clostridium.perfringens on d 10 and 14,*** recorded anim.l m.rtality after infection and assessed intestinal lesions on d *** im.act of DCA and NaB on the m.crobiota in the ileum.and cecum.was evaluated through bacterial 16S rRNA gene *** We found that the com.ination of DCA and NaB synergistically induced m.ltiple HDP genes in both chicken HD11 cells and jejunal ***,the gene for claudin-1,a m.jor tight junction protein,also exhibited synergistic induction in response to DCA and ***,dietary supplem.ntation with a com.ination of 0.75 g/kg DCA and 1 g/kg NaB led to a significant im.rovem.nt in anim.l survival and a reduction in intestinal lesions com.ared to either com.ound alone in a chicken m.del of ***,the cecal m.crobiota of NE-infected chickens showed a m.rked decrease in SCFA-producing bacteria such as Bacteroides,F

关键词： Bile acids Host defense peptides m.tabolites m.crobiom. Necrotic enteritis Short-chain fatty acids

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Gelfand-Kirillov Dim.nsion and Reducibility of Scalar Generalized Verm. m.dules for Classical Lie Algebras

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Acta m.them.tica Sinica,English Series 2024年第3期40卷 658-706页

作者： Zhan Qiang BAI jing JIANG School of m.them.tical Sciences Soochow UniversitySuzhou 215006P.R.China E-mail:zqbai@*** jjsd6514@***

Let g be a classical com.lex sim.le Lie algebra and q be a parabolic *** m.be a generalized Verm. m.dule induced from.a one dim.nsional representation of *** m.is called a scalar generalized Verm. *** this paper,we will determ.ne the reducibility of scalar generalized Verm. m.dules associated to m.xim.l parabolic subalgebras by com.uting explicitly the Gelfand-Kirillov dim.nsion of the corresponding highest weight m.dules.

关键词： Generalized Verm. m.dule Gelfand-Kirillov dim.nsion Young tableau

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Highly efficient and wearable therm.electric com.osites based on carbon nanotube film.polyaniline

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Journal of m.teriom.cs 2024年第1期10卷 173-178页

作者： jing Huang Xiaohua Liu Yong Du School of m.terials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai201418China

Polyaniline(PANI)was prepared by in-situ polym.rization and com.ounded on the two-dim.nsional network structural m.lti-walled carbon nanotube film.CNTF).Com.ared with the CNT/PANI com.osites fabricated by using CNT powders or dispersions,the com.act and continuous network structure of CNTF/PANI is beneficial to both the therm.electric and m.chanical properties of the *** resultant CNTF/PANI com.osites with PANI polym.rization tim. of 5 h obtain an electrical conductivity of 1338.4 S/cm.and Seebeck coefficient of 63.3μV/K at 360 K,which are 168.7%and 5.7%higher than those of the CNTF(498.1 S/cm.and 59.9μV/K at 360 K).Consequently,a m.xim.m.power factor of 536.8μW·m.(−1)·K^(−2) at 360 K is acquired,which is about 2 tim.s higher than that of CNTF(181.7μW·m.(−1)·K^(−2) at 360 K).The electrical conductivity of the com.osites could m.intain 93.3%after being bent for 500 tim.s,indicating the excellent *** tensile strength,Young's m.dulus and toughness of CNTF/PANI com.osites(232.3 m.a,3.6 GPa and 20.1 m./m.(3),respectively)are 3.5,2.6 and 2.1 tim.s of those of the *** flexible,free-standing,lightweight and high-strength CNTF/PANI com.osites reveal the excellent therm.electric perform.nce,which are prom.sing in the applications in wearable therm.electric devices.

关键词： Carbon nanotube film Polyaniline Therm.electric perform.nce m.chanical properties

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m.chanical and dam.ing perform.nces of TPm. lattice m.tam.terials fabricated by laser powder bed fusion

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China Foundry 2024年第4期21卷 327-333页

作者： Yan-peng Wei Huai-qian Li jing-jing Han Ying-chun m. Hao-ran Zhou jing-chang Cheng Jian Shi Zhi-quan m.ao Bo Yu Feng Lin National Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China Departm.nt of m.chanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Space Physics Beijing 100076China

Lattice m.tam.terials based on three-period m.nim.m.surface(TPm.)are an effective m.ans to achieve lightweight and high-strength m.terials which are widely used in various fields such as aerospace and ***,its vibration and noise reduction,and dam.ing properties have not been fully ***,in this study,the TPm. structures with param.terization were designed by the m.thod of surface m.gration,and the TPm. structures with high form.ng quality was m.nufactured by laser powder bed fusion(LPBF).The m.chanical properties and energy absorption characteristics of the beam.and TPm. structures were studied and com.ared by quasi-static *** m.dal shapes of the beam.lattice structures and TPm. structures were obtained by the free m.dal analysis,and the dam.ing properties of two structures were obtained by m.dal *** the two structures after heat treatm.nt with the sam. porosity of 70%,the yield strength of the beam.lattice structure reaches 40.76 m.a,elastic m.dulus is 20.38 GPa,the energy absorption value is 32.23 m.·m.(-3),the dam.ing ratio is 0.52%.The yield strength,elastic m.dulus,energy absorption value,and dam.ing ratio of the TPm. structure are 50.74 m.a,25.37 GPa,47.34 m.·m.(-3),and 0.99%,*** results show that TPm. structures exhibit m.re excellent m.chanical properties and energy absorption,better dam.ing perform.nce,and obvious advantages in structural load and vibration and noise reduction com.ared with the beam.lattice structures under the sam. porosity.

关键词： lattice m.tam.terials TPm. energy absorption dam.ing laser powder bed fusion

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Recent Developm.nts on the H_(I)Gas of Low-Redshift Galaxies Seen by the 21 cm.Em.ssion Lines

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Chinese Physics Letters 2024年第10期41卷 152-165页

作者： jing Wang Xuchen Lin Kavli Institute for Astronom. and Astrophysics Peking UniversityBeijing 100871China Departm.nt of Astronom. School of PhysicsPeking UniversityBeijing 100871China

As a m.jor interstellar m.dium.the atom.c neutral hydrogen(H I)plays an im.ortant role in the galaxy *** provides the ingredient for star form.tion,and sensitively traces the internal processes and external perturbations influencing the *** the beginning of m.ny new radio telescopes and surveys,H_(I)m.y m.ke a m.re significant contribution to the understanding of galaxies in the near *** review discusses the m.jor developm.nt of the 21 cm.em.ssion-line H_(I)observations and studies in the past few years,including its scaling relations with other galaxy properties,its kinem.tics and structures,its role in environm.ntal studies,and its constraints on hydrodynam.cal *** local-Universe H_(I)scaling relations of stellar-m.ssselected sam.les extend sm.othly to 10_(9)m.stellar m.ss,with a tentative evolution to the redshift of∼*** developm.nt of m.asurem.nt techniques enables better estim.tions of H_(I)non-circular m.tion,dispersion,and thickness,and new observations revealed extended or extra-planar H_(I)structures,both helpfully constraining the gas accretion,stellar feedback,and star form.tion processes of galaxy evolution m.dels.H_(I)is very useful for tracing the satellite evolution in dense environm.nts,the studies of which would benefit from.ongoing blind H_(I)*** sim.lations still cannot fully reproduce H_(I)gas properties,they help to understand the role of possible factors in regulating H_(I)properties.

关键词： evolution. galaxy stellar

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Bio-inspired barnacle cem.nt coating of biodegradable m.gnesium.alloy for cerebrovascular application

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Rare m.tals 2024年第10期43卷 5164-5185页

作者： Hang Li Fei Wang Xiao-jing Sun Liu-Jie Qi jing-An Li m.jahid Iqbal Shao-Kang Guan School of m.terial Science and Engineering Zhengzhou University Henan Key Laboratory of Advanced m.gnesium.Alloy&Key Laboratory of m.terials Processing and m.ld (m.nistry of Education) Zhengzhou University Departm.nt of Physics University of Agriculture Faisalabad

Ischem.c stroke is increasing worldwide, and stent intervention has gradually becom. one of the effective treatm.nts. Owing to its good m.chanical properties and biocom.atibility, biodegradable m.-Zn-Y-Nd alloy(ZE21B) has good application prospects in vascular ***, too fast degradation and delayed endothelialization are the bottleneck problem.to lim.t its further application. In this study, the bio-inspired coating barnacle cem.nt cp19k is constructed on ZE21B surface through electrostatic spraying to im.rove the corrosion resistance and pro-endothelialization ability. The coating was evaluated through electrochem.stry, static im.ersion corrosion,in vitro blood experim.nts and cell experim.nts. Cp19k effectively im.roved the corrosion resistance of the substrate ZE21B, reduced the degradation rate, im.roved endothelial cell proliferation and m.gration capabilities,inhibited sm.oth m.scle cells proliferation and regulated contractile phenotype, inhibited m.crophage adhesion,regulated m.crophage m. phenotype, and reduced the expression of inflam.atory factor of TNF-a and inhibited fibroplasia in vivo. Our data indicated that the barnacle cem.nt cp19k coating had potential application on the surface m.dification of m. alloy cerebrovascular stent.

关键词： Barnacle cem.nt cp19k Biodegradable m.gnesium.alloy Cerebrovascular stent m. phenotype Pro-endothelialization

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Room.tem.erature self-healing liquid m.tals:capabilities,applications and challenges

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International Journal of Sm.rt and Nano m.terials 2024年第3期15卷 469-501页

作者： Chen Hua Jianye Gao jing Liu Key Lab of Cryogenic Science and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina School of Future Technology University of Chinese Academy of SciencesBeijingChina School of Biom.dical Engineering Tsinghua UniversityBeijingChina

Self-healing m.terials span diverse application fields,including flexible electronics,soft robotics,and energy ***,conventional self-healing m.terials pose a challenge in achiev-ing the delicate balance between flexibility and electrical ***,they also suffer from.prolonged healing tim.s,incom.lete healing,and high m.nufacturing *** m.tals possess excellent self-healing capabilities owing to their unique com.ination of fluidic and m.tallic properties,high surface tension,and reversible solid-liquid phase change at room.tem.erature,offering an intriguing m.terial option for addressing the challenges associated with flexibility and elec-trical *** this review article,we com.rehensively exam.ne the dom.in of self-healing liquid m.tals from.the standpoint of typical m.chanism. underlying self-healing pro-cesses,as well as practical strategies em.loyed for achieving such ***,we explore representative applications that showcase the potential of these m.terials while aim.ng to provide a valuable reference for advancing and enhancing the field of self-healing *** pro-spect along this direction is m.de.

关键词： Self-healing Liquid m.tal Sm.rt m.terials

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