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Pseudo-break imaging of carbon nanotubes for determining elastic bending energies

Nano Research 2023年第5期16卷 7443-7451页

作者： Changfei Jing Yongji Qin wengen ouyang Jun Luo Institute for New Energy Materials and Low-Carbon Technologies and Tianjin Key Lab of Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

One-dimensional(1D)nanomaterials easily bend due to perturbations from their surroundings or their own *** phenomenon not only impacts the performances of various devices but has also been employed to develop a variety of new functional devices,in which the bending energies of the nanomaterials determine the device ***,measuring the energies of such nanomaterials is extremely ***,pseudo-break imaging of 1D nanomaterials has been proposed and realized on individual carbon nanotubes(CNTs),in which a CNT appears to break and has a fracture but is actually *** imaging approach provides the values of the bending energies of the CNTs with an accuracy of 1–50 ***,this imaging approach can manipulate the bending shapes and energies of *** work presents a protocol for bending analysis and manipulation,which are vital to fundamental and applied studies of 1D nanomaterials.

关键词： pseudo-break imaging carbon nanotube electron microscopy elastic bending energy

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A stable oxygen evolution splitting electrocatalysts high entropy alloy FeCoNiMnMo in simulated seawater

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Journal of Materials Science & Technology 2023年第7期138卷 29-35页

作者： Peng Li Yuanpeng Yao wengen ouyang Ze Liu Huayi Yin Dihua Wang International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province Wuhan UniversityWuhan 430072China School of Resource and Environmental Science Wuhan UniversityWuhan 430072China Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072China

Stabilizing anode for oxygen evolution(OER)in chlorine-containing electrolytes is a significant *** corrosion inhibitors in electrolytes can alleviate this problem,but the type and dosage of cor-rosion inhibitors need a lot of exploration,and side reactions may occur to reduce current ***,we prepared a FeCoNiMnMo High entropy alloy(HEA)electrode for OER in simulated seawa-ter without corrosion *** exhibits great electrocatalytic activity(overpotential(η)=237 mV at 10 mA cm^(-2))and excellent stability(200 h at 100 mA cm^(-2)).Experiments and Density Functional The-ory(DFT)calculation show that the protective layer containing K_(2)MoO_(4)is the crucial factor for chlorine resistance of FeCoNiMnMo *** tightly adsorbed state of Cl-and K_(2)MoO_(4)ensures that other oxides are not *** the externally added K_(2)MoO_(4)cannot protect the *** addition,the high-entropy effect of HEA reduces the dissolution of the *** work provides an efficient way to prepare a noble-free HEA catalyst that can stabilize oxygen evolution in corrosive electrolytes.

关键词： High entropy alloy Oxygen evolution reaction Corrosion inhibitor Chlorine resistance K_(2)MoO_(4)

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Deducing the internal interfaces of twisted multilayer graphene via moiré-regulated surface conductivity

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National Science Review 2023年第8期10卷 194-202页

作者： Huan Wang Sen Wang Shuai Zhang Mengzhen Zhu wengen ouyang Qunyang Li Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University 2. Department of Engineering Mechanics School of Civil EngineeringWuhan University 3. State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan University State Key Laboratory of Tribology in Advanced Equipment Tsinghua University

The stacking state of atomic layers critically determines the physical properties of twisted van der Waals materials. Unfortunately, precise characterization of the stacked interfaces remains a great challenge as they are buried internally. With conductive atomic force microscopy, we show that the moiré superlattice structure formed at the embedded interfaces of small-angle twisted multilayer graphene(tMLG) can noticeably regulate surface conductivity even when the twisted interfaces are 10 atomic layers beneath the surface. Assisted by molecular dynamics(MD) simulations, a theoretical model is proposed to correlate surface conductivity with the sequential stacking state of the graphene layers of tMLG. The theoretical model is then employed to extract the complex structure of a tMLG sample with crystalline defects. Probing and visualizing the internal stacking structures of twisted layered materials is essential for understanding their unique physical properties, and our work offers a powerful tool for this via simple surface conductivity mapping.

关键词： twisted graphene electrical conductivity embedded interface atomic reconstruction moiré pattern

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A Simple Method to Measure the Contact Angle of Metal Droplets on Graphite

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Nanomanufacturing and Metrology 2023年第4期6卷 35-45页

作者： Bozhao Wu Yongping Kang Cai Lu Langquan Shui wengen ouyang Qi Peng Qiankun He Ze Liu Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072HubeiChina School of Civil Engineering Architecture and Environment Hubei University of TechnologyWuhan 430068HubeiChina System Design Institute of Hubei Areospace Technology Academy Wuhan 430040China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

The determination of solid–liquid interfacial tension plays an important role in science and ***,we propose a simple method to directly measure the contact angle between metal droplets and a graphite substrate for the determination of metal–graphite interfacial *** proposed method involves the synthesis of micro-and nanosized metal droplets on graphite by arc *** to its small volume,the rapid cooling of the prepared metal droplets on the graphite substrate leads to the freezing of equilibrium contact confguration after *** observe that the measured contact angle between micro-and nanosized Au(or Ag)particles and the graphite substrate is almost size independent,even though the size of the particles synthesized herein is 1–3 orders of magnitude smaller than that studied in previous *** addition,the interfacial tensions of Au and Ag on the step edges(edge plane)of graphite are found to be larger than that on the(0001)plane(basal plane).The proposed method provides a simple approach to determine the solid–liquid interfacial tension and may be efective in the study of interface related science and technology.

关键词： Metal droplets Graphite/graphenes Contact angle Interfacial tension

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Energy corrugation in atomic-scale friction on graphite revisited by molecular dynamics simulations

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Acta Mechanica Sinica 2016年第4期32卷 604-610页

作者： Xiao-Yu Sun Yi-Zhou Qi wengen ouyang Xi-Qiao Feng Qunyang Li AML and CNMM Department of Engineering MechanicsTsinghua University Department of Engineering Mechanics School of Civil Engineering Wuhan University State Key Laboratory of Tribology Tsinghua University

Although atomic stick–slip friction has been extensively studied since its first demonstration on graphite,the physical understanding of this dissipation-dominated phenomenon is still very limited. In this work, we perform molecular dynamics（MD） simulations to study the frictional behavior of a diamond tip sliding over a graphite surface. In contrast to the common wisdom, our MD results suggest that the energy barrier associated lateral sliding（known as energy corrugation） comes not only from interaction between the tip and the top layer of graphite but also from interactions among the deformed atomic layers of graphite. Due to the competition of these two subentries, friction on graphite can be tuned by controlling the relative adhesion of different *** relatively low tip-graphite adhesion, friction behaves normally and increases with increasing normal load. However,for relatively high tip-graphite adhesion, friction increases unusually with decreasing normal load leading to an effectively negative coefficient of friction, which is consistent with the recent experimental observations on chemically modified graphite. Our results provide a new insight into the physical origins of energy corrugation in atomic scale friction.

关键词： graphite friction diamond sliding tuned stick dissipation decreasing chemically oscillatory

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Temperature and velocity dependent friction of a microscale graphite-DLC heterostructure

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Friction 2020年第2期8卷 462-470页

作者： Yujie GONGYANG wengen ouyang Cangyu QU Michael URBAKH Baogang QUAN Ming MA Quanshui ZHENG Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Center for Nano and Micro Mechanics Tsinghua UniversityBeijing 100084China School of Chemistry and The Sackler Center for Computational Molecular and Materials Science Tel Aviv UniversityTel Aviv 69978Israel The Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv UniversityTel Aviv 69978Israel Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite *** we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon,a commercially available material with a ultra-flat *** interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than I *** an integrated approach,which includes Argon plasma irradiation of diamond-like carbon surfaces,X-ray photoelectron spectroscopy analysis and Langmuir adsorption modeling,we found that while the velocity dependence of friction follows a thermally activated sliding mechanism,its temperature dependence is due to the desorption of chemical groups upon *** observations indicate that the edges have a significant contribution to the *** results highlight potential factors affecting this type of emerging friction junctions and provide a novel approach for tuning their friction properties through ion irradiation.

关键词： friction graphite diamond like carbon irradiation desorption

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