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Nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan Yang Xiaopeng Liu Zhenwei Wu Xiaoyang Gao Tao Ma Jeffrey T.Miller Daniela S.Mainardi Collin D.Wick zhenhua zeng Yang Xiao Yue Wu Department of Chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for Materials Characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and Science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2TiC2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical *** compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and *** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst *** metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers

Gut commensal metabolite rhamnose promotes macrophages phagocytosis by activating SLC12A4 and protects against sepsis in mice

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Acta Pharmaceutica Sinica B 2024年第7期14卷 3068-3085页

作者： Dongping Li Rongjuan Wei Xianglong Zhang Shenhai Gong Meijuan Wan Fangzhao Wang Jiaxin Li Meiling Chen Ruofan Liu Yantong Wan Yinghao Hong zhenhua zeng Peng Gu Zhang Wang Kutty Selva Nandakumar Yong Jiang Hongwei Zhou Peng Chen Department of Pathophysiology Guangdong Provincial Key Laboratory of ProteomicsSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510000China Department of Critical Care Medicine Nanfang HospitalSouthern Medical UniversityGuangzhou 510000China Department of Gastroenterology Shenzhen HospitalSouthern Medical UniversityShenzhen 518000China Institute of Ecological Sciences School of Life SciencesSouth China Normal UniversityGuangzhou 510000China Department of Environmental and Biosciences School of BusinessInnovation and SustainabilityKristian IV’s vag 3Halmstad UniversityHalmstad 30004Sweden Microbiome Medicine Center Zhujiang HospitalSouthern Medical UniversityGuangzhou 510000China

Sepsis progression is significantly associated with the disruption of gut ***,the modulatory mechanisms of gut microbiota operating during sepsis are still ***,we investigated how gut commensals impact sepsis development in a pre-clinical *** ligation and puncture(CLP)surgery was used to establish polymicrobial sepsis in *** depleted of gut microbiota by an antibiotic cocktail(ABX)exhibited a significantly higher level of mortality than *** determined by metabolomics analysis,ABX treatment has depleted many metabolites,and subsequent supplementation with L-rhamnose(rhamnose,Rha),a bacterial carbohydrate metabolite,exerted profound immunomodulatory properties with a significant enhancement in macrophage phagocytosis,which in turn improved organ damage and ***,rhamnose binds directly to and activates the solute carrier family 12(potassium-chloride symporter),member 4(SLC12A4)in macrophages and promotes phagocytosis by activating the small G-proteins,Ras-related C3 botulinum toxin substrate1(Rac1)and cell division control protein 42 homolog(Cdc42).Interestingly,rhamnose has enhanced the phagocytosis capacity of macrophages from sepsis *** conclusion,by identifying SLC12A4 as the host interacting protein,we disclosed that the gut commensal metabolite rhamnose is a functional molecular that could promote the phagocytosis capacity of macrophages and protect the host against sepsis.

关键词： Gut microbiota Sepsis Rhamnose SLC12A4 GTP-Rac1 GTP-Cdc42 Macrophage Phagocytosis

Synthesis and Application of Carbon Nanotubes

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Journal of Natural Gas Chemistry 2006年第3期15卷 235-246页

作者： Qun zeng zhenhua Li Yuhong Zhou Key Laboratory for Green Chemical Technology School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Owing to the unique structure, the superior physical and chemical properties, the super strong mechanical performances, and so on, carbon nanotubes have attracted the attention of researchers all over the world. In this article, the basic properties and the main production processes of carbon nanotubes are introduced in brief, and the progress of applied research for carbon nanotubes is reviewed.

关键词： carbon nanotube arc discharge chemical vapor deposition laser ablation application

First-principles calculation of core-level binding energy shift in surface chemical processes

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Science China Chemistry 2010年第2期53卷 402-410页

作者： zeng zhenhua MA XiuFang DING WuChen LI WeiXue State Key Laboratory of Catalysis and Center for Theoretical and Computational Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Combined with third generation synchrotron radiation light sources, X-ray photoelectron spectroscopy (XPS) with higher energy resolution, brilliance, enhanced surface sensitivity and photoemission cross section in real time found extensive applications in solid-gas interface chemistry. This paper reports the calculation of the core-level binding energy shifts (CLS) using the first-principles density functional theory. The interplay between the CLS calculations and XPS measurements to uncover the structures, adsorption sites and chemical reactions in complex surface chemical processes are highlight. Its application on clean low index (111) and vicinal transition metal surfaces, molecular adsorption in terms of sites and configuration, and reaction kinetics are domonstrated.

关键词： first principles core-level binding energy shift surface chemical processes

A novel chromogenic and fluorogenic scaffold for detection of oxidative radicals

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Chinese Chemical Letters 2017年第10期28卷 2001-2004页

作者： Zuhai Lei zhenhua zeng Xuhong Qian Youjun Yang State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Chemical Biology School of Pharmacy East China University of Science and Technology Shanghai 200237 China

Radical detection has attracted significant attention recently. Here we have developed a scaffold through covalent assembly principle（OR570）, which could facile applications in detection of oxidative *** primary advantage of the assembly type probe lies at the turn-on fluorescence signal from a zero background and hence high fluorescence turn-on ratio for sensitive detection of weak signal.

关键词： Radicals Fluorescent probe Covalent assembly Nitrogen dioxide Fluorogenic

基于现状索力评估和限载通车的斜拉桥换索设计

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公路与汽运 2024年第4期40卷 118-123页

作者：胡翌刚杜泓毅曾振华吴坤平黄斌湖南省交通建设质量安全监督管理局湖南长沙410116 湖南科技大学湖南湘潭411201 湖南省交通规划勘察设计院有限公司湖南长沙410200 湖南省工程结构安全与监测(控)工程技术研究中心湖南长沙410200

以某大跨度混凝土斜拉桥斜拉索更换为背景,采用适度指标模型对现状索力进行评估,计算单索索力评估值,分析各索的基本评估值分布规律,得出现状索力状况不佳、不适宜进行索力优化的结论,提出等索力替换的换索原则;结合拉索张拉端垫板过高... 详细信息

以某大跨度混凝土斜拉桥斜拉索更换为背景,采用适度指标模型对现状索力进行评估,计算单索索力评估值,分析各索的基本评估值分布规律,得出现状索力状况不佳、不适宜进行索力优化的结论,提出等索力替换的换索原则;结合拉索张拉端垫板过高的现状,对索长进行修正,解决斜拉索锚圈作用位置不合理的问题;通过对换索过程的有限元计算分析,以主梁应力和索力变化较小为控制目标,提出单边换索、单边通行、换索间距在3个索号以上的换索方法及换索过程中限载6 t小车正常通行、公交车以15 m的间距通行的交通管控措施。

关键词：桥梁斜拉桥索力评估等索力替换索长修正限载通车

Engineering the high-entropy phase of Pt-Au-Cu nanowire for electrocatalytic hydrogen evolution

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Nano Research 2023年第8期16卷 10742-10747页

作者： Yanan Yu Guangdong Liu Shuaihu Jiang Ruya Zhang Huiqiu Deng Eric AStach Shujuan Bao zhenhua zeng Yijin Kang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Materials Science and Engineering University of PennsylvaniaPhiladelphiaPA 19104USA Institute for Clean Energy&Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715China Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907USA

Hydrogen economy,as the most promising alternative energy system,relies on the hydrogen production through sustainable water splitting which in turn relies on the high efficiency *** A1-phase alloy has been predicted to be a promising electrocatalyst for the hydrogen *** such preferred phase of Pt-Au-Cu is not thermodynamically favored,herein,we stabilize PtAuCu alloy by engineering the high-entropy phase in the form of *** functional theory(DFT)calculations indicate that,in comparison with the ordered phase and segregated phases with discrete hydrogen binding energy,the high-entropy phase provides a diverse combination of site composition to continuously tune the hydrogen binding energy,and thus generate a series of highly active sites for the hydrogen *** the theoretical prediction,electrochemical tests show that the A1-phase PtAuCu nanowire significantly outperforms its nanoparticle counterpart with phase segregation,toward the electrocatalysis of hydrogen evolution,offering one of the best hydrogen evolution electrocatalysts.

关键词： hydrogen evolution reaction phase engineering high entropy alloys

Density functional theory study of active sites and reaction mechanism of ORR on Pt surfaces under anhydrous conditions

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Chinese Journal of Catalysis 2022年第12期43卷 3126-3133页

作者： Guangdong Liu Huiqiu Deng Jeffrey Greeley zhenhua zeng School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907USA

Identifying active sites and catalytic mechanism of the oxygen reduction reaction under anhydrous conditions are crucial for the development of next generation proton exchange membrane fuel cells(PEMFCs)operated at a temperature>100℃.Here,by employing density functional theory calculations,we studied ORR on flat and stepped Pt(111)surfaces with both(110)and(100)type of *** found that,in contrast to ORR under hydrous conditions,(111)terrace sites are not active for ORR under anhydrous conditions,because of weakened binding of ORR intermediates induced by O*accumulation on the *** the other hand,step edges,which are generally not active for ORR under hydrous conditions,are predicted to be the active sites for ORR under anhydrous *** them,(110)type step edge with a unique configuration of accumulated O stabilizes O_(2)adsorption and facilitates O_(2)dissociation,which lead an overpotential<0.4 *** improve ORR catalysts in high-temperature PEMFCs,it is desirable to maximize(110)step edge sites that present between two(111)facets of nanoparticles.

关键词： Oxygen reduction Active site Anhydrous condition High-temperature PEMFCs Density functional theory

Trunk‑Inspired SWCNT‑Based Wrinkled Films for Highly‑Stretchable Electromagnetic Interference Shielding and Wearable Thermotherapy

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Nano-Micro Letters 2024年第11期16卷 429-444页

作者： Xiaofeng Gong Tianjiao Hu You Zhang Yanan zeng Ye Zhang zhenhua Jiang Yinlong Tan Yanhong Zou Jing Wang Jiayu Dai zengyong Chu College of Science National University of Defense TechnologyChangsha 410073People’s Republic of China Beijing Interdisciplinary Research Center National University of Defense TechnologyChangsha 410073People’s Republic of China School of Physics and Electronics Hunan UniversityChangsha 410082People’s Republic of China

Nowadays,the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health,so stretchable electromagnetic interference(EMI)shielding materials are highly *** trunks are capable of grabbing fragile vegetation and tearing trees thanks not only to their muscles but also to their folded *** by the wrinkled skin of the elephant trunks,herein,we propose a winkled conductive film based on single-walled carbon nanotubes(SWCNTs)for multifunctional EMI *** conductive film has a sandwich structure,which was prepared by coating SWCNTs on both sides of the stretched elastic latex cylindrical *** shrinking-induced winkled conductive network could withstand up to 200%tensile ***,when the stretching direction is parallel to the polarization direction of the electric field,the total EMI shielding effectiveness could surprisingly increase from 38.4 to 52.7 dB at 200%tensile *** is mainly contributed by the increased connection of the *** addition,the film also has good Joule heating performance at several voltages,capable of releasing pains in injured *** unique property makes it possible for strain-adjustable multifunctional EMI shielding and wearable thermotherapy applications.

关键词： Electromagnetic interference shielding Single-walled carbon nanotubes Wrinkles Stretchable Thermotherapy

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网络议程设置:理论、方法与展望

江西师范大学学报（哲学社会科学版） 2019年第6期52卷 91-99页

作者：曾振华曾林浩江西师范大学新闻与传播学院江西南昌330022 中国传媒大学电视学院中国北京100024

近年来国外有研究开始探索议程设置的第三层效果——网络议程设置,这一效果已得到初步证实。新模式认为媒体不仅能告诉我们“思考什么”以及“该怎样思考”,还能影响公众“联系什么以及怎样联系”。其测量方法——社会网络分析法不仅提... 详细信息

近年来国外有研究开始探索议程设置的第三层效果——网络议程设置,这一效果已得到初步证实。新模式认为媒体不仅能告诉我们“思考什么”以及“该怎样思考”,还能影响公众“联系什么以及怎样联系”。其测量方法——社会网络分析法不仅提供一个新角度来理解大众媒体影响公众“脑海中图景”的性质,还对整个议程设置研究提供了多元启发。通过对国外网络议程设置研究进展的梳理与未来研究方向的探讨,可以看出该模式的研究总体上尚处在起步阶段,研究边界需要扩展,亟需一个“无形学院”提供更多的角度和方法引起研究的扩散。这些都可以启发中国研究者借鉴这一新视角的研究方法与逻辑,挖掘本土问题和经验证据,以期与西方主流学术对话与沟通。

关键词：头脑中图景传统议程设置网络议程设置社会网络分析