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| 1 | Experimental advances in superlubricity显示文摘Superlubricity,or structural lubricity,is a state that has two contacting surfaces exhibiting no resistance to sliding.This effect has been theoretically described to be possible between two completely clean single crystalline solid surfaces.However,experimental observations of superlubricity were limited to nanoscale and under high vacuum or inert gas environments even after twenty years since the concept of superlubricity has been suggested in 1990.In the last two years,remarkable advances have been achieved in experimental observations of superlubricity ranging from micro-scale to centimeters and in ambient environment.This study aims to report a comprehensive understanding of the superlubricity phenomenon. | Quanshui ZHENG Ze LIU | 2014 | Friction2014，2，2： | 7 |
| 2 | INTERACTION MODELS FOR EFFECTIVE THERMAL AND ELECTRIC CONDUCTIVITIES OF CARBON NANOTUBE COMPOSITES显示文摘The present article provides supplementary information of previous works of analytic models for predicting conductivity enhancements of carbon nanotube composites. The models,though fairly simple,are able to take account of the effects of conductivity anisotropy,nonstraightness,and aspect ratio of the CNT additives on the conductivity enhancement of the composite and to give predictions agreeing well with existing experimental data. The omitted detailed derivation of this model is demonstrated in the present article with a more systematical analysis,which may help with further development in this direction. Furthermore,the effects of various orientation distributions of CNTs are reported here for the first time. The information may be useful in design or fabrication technology of CNT composites for better or specified conductivities. | Fei Deng Quanshui Zheng | 2009 | Acta Mechanica Solida Sinica2009，22，1： | 6 |
| 3 | Temperature and velocity dependent friction of a microscale graphite-DLC heterostructure显示文摘One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite mesas.Here we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon,a commercially available material with a ultra-flat surface.The interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than I nm.Using 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 heating.These observations indicate that the edges have a significant contribution to the friction.Our results highlight potential factors affecting this type of emerging friction junctions and provide a novel approach for tuning their friction properties through ion irradiation. | Yujie GONGYANG Wengen OUYANG Cangyu QU Michael URBAKH Baogang QUAN Ming MA Quanshui ZHENG | 2020 | Friction2020，8，2： | 5 |
| 4 | Micro- and nano-mechanics in China: A brief review of recent progress and perspectives显示文摘The past three decades have witnessed the explosion of nanoscience and technology, where notable research efforts have been made in synthesizing nanomaterials and controlling nanostructures of bulk materials. The uncovered mechanical behaviors of structures and materials with reduced sizes and dimensions pose open questions to the community of mechanicians, which expand the framework of continuum mechanics by advancing the theory, as well as modeling and experimental tools. Researchers in China have been actively involved into this exciting area, making remarkable contributions to the understanding of nanoscale mechanical processes, the development of multi-scale, multi-field modeling and experimental techniques to resolve the processing-microstructures-properties relationship of materials, and the interdisciplinary studies that broaden the subjects of mechanics. This article reviews selected progress made by this community, with the aim to clarify the key concepts, methods and applications of micro-and nano-mechanics, and to outline the perspectives in this fast-evolving field. | ZhiPing Xu QuanShui Zheng | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，7： | 5 |
| 5 | Suspended penetration wetting state of droplets on microstructured surfaces显示文摘When a water droplet on a micropillar-structured hydrophobic surface is submitted to gradually increased pressure, the CassieBaxter wetting state transforms into the Wenzel wetting state once the pressure exceeds a critical value. It has been assumed that the reverse transition(Wenzel-to-Cassie-Baxter wetting state) cannot happen spontaneously after the pressure has been removed.In this paper, we report a new wetting-state transition. When external pressure is exerted on a droplet in the Cassie-Baxter wetting state on textured surfaces with high micropillars to trigger the breakdown of this wetting state, the droplet penetrates the micropillars but does not touch the base of the surface to trigger the occurrence of the Wenzel wetting state. We have named this state the suspended penetration wetting state. Spontaneous recovery from the suspended penetration wetting state to the initial Cassie-Baxter wetting state is achieved when the pressure is removed. Based on the experimental results, we built models to establish the penetration depth that the suspended penetration wetting state could achieve and to understand the energy barrier that influences the equilibrium position of the liquid surface. These results deepen our understanding of wetting states on rough surfaces subjected to external disturbances and shed new light on the design of superhydrophobic materials with a robust wetting stability. | Jing Lou SongLin Shi Chen Ma CunJing Lv QuanShui Zheng | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，4： | 2 |
| 6 | Sliding of Water Droplets on Microstructured Hydrophobic Sur-faces显示文摘 | Cunjing Lv Quanshui Zheng | | 0，，26： | 1 |
| 7 | Determination of volumetric elastic moduli of plant leaf cells based on pressure-volume curves显示文摘Volumetric elastic modulus(VEM) is an important parameter in biophysics and biomechanics of plants for in particular understanding cell growth.This paper proposes a new relation that can be used for precisely determining VEM.With the aid of this relation,it shows that the exponential approximation of the pressure-volume relationship adopted in most of the literatures in this field may lead to serious errors on VEM. | Yanxiang Zhang Quanshui Zheng | 2012 | Theoretical & Applied Mechanics Letters2012，2，1： | 1 |
| 8 | Elementary building blocks of graphene-nanoribbon-based electronic devices显示文摘 | Xu Zhiping Zheng Quanshui Chen Guanhua | 2007 | Appl Phys Lett2007，90，22： | 1 |
| 9 | Sweat-Driven Silk-yarn Switches Enabled by Highly Aligned Gaps for Air-conditioning Textiles显示文摘Smart textiles are attracting great interest.Particularly,air-conditioning textiles are highly desired for their merits in energy conservation and personal temperature/humidity management.Currently,air-conditioning textiles can be fabricated by two strategies.One uses infrared-radiation-adaptive materials,and the other uses moisture-responsive actuators that can regulate temperature and humidity simultaneously.Here,the fabrication of a silk-yarn switch comprising electrospun highly aligned nanofibers is reported and its application in air-conditioning textiles is demonstrated.Silk yarn rotates in contact with liquid,and can be recovered by drying.The different responses and wetting behaviors of the switch to H_(2)O and C_(2)H_(6)O is investigated.It is argued that alignment and surface hydrophilicity of nanofibers play important roles in this term.To elaborate,actuating trait is mainly controlled by reduction of the surface free energy of aligned silk nanofibers,during the wetting process.As proof of concept,the application of the sweat-driven silk-yarn switch in regulating the temperature/humidity of the human body is demonstrated in this work.Considering the large production,versatile processibility,and good biocompatibility,silk actuator may have practical applications in designing smart switches(or valves)for intelligent textiles,artificial muscles,and other application scenarios. | Zhe Yin Songlin Shi Xiaoping Liang Mingchao Zhang Quanshui Zheng Yingying Zhang | 2019 | Advanced Fiber Materials2019，1，3： | 1 |
| 10 | General algorithms for the polar decomposition and strains显示文摘 | Xiong Zuhua Zheng Quanshui | 1988 | Acta Mechanica Sinica1988，，2： | 1 |
| 11 | SOME BASIC PROBLEMS IN NUMERICALLY SIMULATING EFFECTIVE PROPERTIFS AND LOCAL FIELDS OF COMPOSITE MATERIALS显示文摘It is pointed out that to numerically estimate the effective properties and local fields ofmatrix-inclusion composites,a commonly adopted method is accompanied with some serious draw-backs.We call this method the nominal loading scheme(NLS),which considers the actual inclusiondistribution inside a finite domain,Ω say,treats the external domain of Ω to be of the pure matrix ma-terial,and imposes the actural traction,σ~∞ say on the remote boundary.It thus gives rise to the fol-lowing basic problems:(i)Can NLS be improved remarkably just by adjusting σ~∞?(it)What isthe relationship between the size of Ω and the,scale of inclusions?(iii)Which choice isbetter in calculating the effective properties,the whole domain Ω or an appropriatelyselected sub-domain of Ω? Targeting these problems,the equivalent loading,scheme(ELS)and equivalent matrix scheme(EMS)are proposed.It is theoretically analyzedthat both ELS and EMS can be used to precisely simulating the effective properties andlocal fields of matrix-inclusion composites,and both ELS and EMS are self-approved.As an application,ELS combined with a m-called pseudo-dislocations method is used toevaluate the effective properties and local fields of two-dimensional two-phase compos-ites with close-packed circular inclusions,or randomly distributed circular inclusions,or randomly distributed mierocracks.The results show that substituting the remote trac-tion σ~∞ with the effective stress field σ~E suggested by IDD scheme is a simple and effec-tive method,and the estimation of the effective properties and local fields is very closeto the accurate,solution. | Wen Ming Zheng Quanshui Du Danxu (Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China) | 1999 | Acta Mechanica Solida Sinica1999，12，4： | 0 |
| 12 | Controlled Movements in Superlubric MEMS显示文摘Structural superlubricity(SSL)refers to a state where the friction and wear between two directly contacted solid surfaces are virtually zero.The realization of microscale SSL in 2012 rapidly explored SSL technologies which hold great potential in the development of reliable and energy⁃efficient micro devices.A key to a successful superlubric device is to control the movements of the superlubric slider.To solve this challenge,here two general principles are shown to guide and control the motion of the slider,i.e.,by minimization of interfacial energy and minimization of electrostatic energy.When the shapes of the slider and substrate are designed appropriately,the excess interfacial energy of the contact⁃pair provides restoring and constraining forces to the slider.Similarly,tunable driving and constraining forces are enabled by the electric fields induced by the electrodes buried in the substrate.These concepts are demonstrated on the design of a superlubric resonator whose natural frequency of the lateral translational mode is well⁃defined and unfavorable rotation is constrained.The above design principles should be applicable to superlubric devices in general and help the development of future applications of structural superlubricity. | Cangyu Qu Xiaojian Xiang Ming Ma Quanshui Zheng | 2020 | Journal of Harbin Institute of Technology(New Series)2020，27，3： | 0 |
| 13 | Oscillating friction of nanoscale capillary bridge显示文摘The presence of a capillary bridge between solid surfaces is ubiquitous under ambient conditions.Usually,it leads to a continuous decrease of friction as a function of bridge height.Here,using molecular dynamics we show that for a capillary bridge with a small radius confined between two hydrophilic elastic solid surfaces,the friction oscillates greatly when decreasing the bridge height.The underlying mechanism is revealed to be a periodic ordered-disordered transition at the liquid–solid interfaces.This transition is caused by the balance between the surface tension of the liquid–vapor interface and the elasticity of the surface.This balance introduces a critical size below which the friction oscillates.Based on the mechanism revealed,a parameter-free analytical model for the oscillating friction was derived and found to be in excellent agreement with the simulation results.Our results describe an interesting frictional phenomenon at the nanoscale,which is most prominent for layered materials. | Shuai WU Yuqing HE Quanshui ZHENG Ming MA | 2022 | Friction2022，10，2： | 0 |
| 14 | CURRENT TRENDS OF MICRO-AND NANOMECHANICS显示文摘Introduction Scaling down to the micro- and nanoscale is a strong current trend in the development of science and technology. | Wanlin Guo(Institute of Nanoscience,Nanjing University of Aeronautics and Astronautics,Nanjing210016, China)Huiming Xie(AML,Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China)Quanshui Zheng(Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China) | 2009 | Acta Mechanica Solida Sinica2009，22，6： | 0 |
| 15 | Mechanics of soft particle capture using nanofiber networks显示文摘Nano-particle capture is a key process in fltration,separation,and biomedical applications.Here we explored the mechanisms of soft particle capture using nanofber networks.We identifed possible states of the capture process,which are defned by their structural and material parameters.By performing numerical analysis,we provided a phase diagram in the parametric space of the network structure and interfacial adhesion.The work provides a conceptual model for rational design of synthetic materials in related applications that focus on the protection against or removal of virus,as well as other soft particles. | Yu Wan Quanshui Zheng Zhiping Xu | 2013 | Theoretical & Applied Mechanics Letters2013，3，5： | 0 |
| 16 | LARGE DEFLECTION THEORY OF NANOBEAMS显示文摘One-dimensional nanostructured materials are often used as beams in many applications such as ultrahigh-frequency resonators and ultrasensitive sensors.Compared with usual macroscopic beams,nanobeams have much higher surface/volume ratios so that their surface energies may play a significant role.Besides,they often bear large deflections due to their typically large slenderness ratios and larger elastic ranges.There is,however,lack of a theory that takes into account of both the above two features owned by nanobeams.In this paper,we present such a theory and give applied examples to show that surface energy and large deflection may individually or jointly have notable effects. | Dujuan Zeng Quanshui Zheng 1(Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China) | 2010 | Acta Mechanica Solida Sinica2010，23，5： | 0 |
| 17 | Investigation on the Formation Mechanism of Double-Layer Vertically Aligned Carbon Nanotube Arrays via Single-Step Chemical Vapour Deposition显示文摘The mechanism for the formation of double-layer vertically aligned carbon nanotube arrays(VACNTs) through single-step CVD growth is investigated. The evolution of the structures and defect concentration of the VACNTs are tracked by scanning electron microscopy(SEM) and Raman spectroscopy. During the growth, the catalyst particles are stayed constantly on the substrate. The precipitation of the second CNT layer happens at around 30 min as proved by SEM.During the growth of the first layer, catalyst nanoparticles are deactivated with the accumulation of amorphous carbon coatings on their surfaces, which leads to the termination of the growth of the first layer CNTs. Then, the catalyst particles are reactivated by the hydrogen in the gas flow, leading to the precipitation of the second CNT layer. The growth of the second CNT layer lifts the amorphous carbon coatings on catalyst particles and substrates. The release of mechanical energy by CNTs provides big enough energy to lift up amorphous carbon flakes on catalyst particles and substrates which finally stay at the interfaces of the two layers simulated by finite element analysis. This study sheds light on the termination mechanism of CNTs during CVD process. | Shoumo Zhang Deli Peng Huanhuan Xie Quanshui Zheng Yingying Zhang | 2017 | Nano-Micro Letters2017，9，1： | 0 |
| 18 | 100 km wear-free sliding achieved by microscale superlubric graphite/DLC heterojunctions under ambient conditions显示文摘Wear-free sliding between two contacted solid surfaces is the ultimate goal in the effort to extend the lifetime of mechanical devices,especially when it comes to inventing new types of micro-ele ctromechanical systems where wear is often a major obstacle.Here we report experimental observations of wear-free sliding for a micrometer-sized graphite flake on a diamond-like-carbon(DLC) surface under ambient conditions with speeds up to 2.5 m/s,and over a distance of 100 km.The coefficient of friction(COF) between the microscale graphite flake,a van der Waals(vdW) layered material and DLC,a non-vdW-layered material,is measured to be of the order of 10^(-3),which belongs to the superlubric regime.Such ultra-low COFs are also demonstrated for a microscale graphite flake sliding on six other kinds of non-vdW-layered materials with sub-nanometer roughness.With a synergistic analysis approach,we reve al the underlying mechanism to be the combination of interfacial vdW interaction,atomic-smooth interfaces and the low normal stiffness of the graphite flake.These features guarantee a persistent full contact of the interface with weak interaction,which contributes to the ultra-low COFs.Together with the extremely high in-plane strength of graphene,wear-free sliding is achieve d.Our results broaden the scope of superlubricity and promote its wider application in the future. | Deli Peng Jin Wang Haiyang Jiang Shuji Zhao Zhanghui Wu Kaiwen Tian Ming Ma Quanshui Zheng | 2022 | National Science Review2022，9，1： | 0 |
| 19 | Writing with a nano-grooved pin显示文摘As a basic technology, dispensing liquid into small droplets is widely used in many nowadays technologies, such as 3D printing [I-4], biological/chemical patterning [5-7], and drug discovery [8,9]. Traditional transfer methods by pipette or pin, which may date to 4000 years ago [10], are simple and cheap to generate droplets bigger than μ100 pm [11] for most materials. | DONG HuaLai YANG Xing LV CunJing WANG Jin ZHENG QuanShui | 2019 | Science China(Technological Sciences)2019，62，9： | 0 |
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