- 作 者: ( "langquan shui" OR "lang-quan shui" )
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Terrain Adaptability and Optimum Contact Stiffness of Vibro-bot with Arrayed Soft LegsSoft Robotics (IF 7.784) Pub Date : 2022-10-13 ,DOI:10.1089/soro.2021.0029Yingbo Yan, Langquan Shui, Siyu Liu, Zeming Liu, Yilun LiuThe terrain adaptability of the state-of-the-art robot is far behind natural animals, partly because of limited sensing, intelligence, controlling, and actuating ability. One possible solution is to explore the flexible locomotion structure and locomotion mode with good adaptability and fault tolerance. Based on this idea, we presented a type of vibro-bot with arrayed soft legs (VBASL) with excellent ...
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Aligned Magnetic Nanocomposites for Modularized and Recyclable Soft MicrorobotsACS Applied Materials & Interfaces (IF 10.383) Pub Date : 2022-09-13 ,DOI:10.1021/acsami.2c13108Langquan Shui, Ke Ni, Zhengzhi WangCreating reconfigurable and recyclable soft microrobots that can execute multimodal locomotion has been a challenge due to the difficulties in material processing and structure engineering at a small scale. Here, we propose a facile technique to manufacture diverse soft microrobots (∼100 μm in all dimensions) by mechanically assembling modular magnetic microactuators into different three-dimensional ...
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Deflection of film under biaxial tension and central concentrated loadArchive of Applied Mechanics (IF 2.467) Pub Date : 2022-07-11 ,DOI:10.1007/s00419-022-02204-3Yidu Zhang, Langquan Shui, Yongshou LiuPoking with a sharp probe has been one of the most popular method to characterize mechanical properties of materials in film form including atomically thin two-dimensional materials. Herein, we propose an approximate analytical framework for describing the deflection of films under anisotropic tension and central concentrated load, which is expected to provide a more flexible selection and more robust ...
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Spontaneous Movement of a Droplet on a Conical Substrate: Theoretical Analysis of the Driving ForceACS Omega (IF 4.132) Pub Date : 2022-06-07 ,DOI:10.1021/acsomega.2c01713Jianxin Liu, Zhicheng Feng, Wengen Ouyang, Langquan Shui, Ze LiuExperiments and simulations have shown that a droplet can move spontaneously and directionally on a conical substrate. The driving force originating from the gradient of curvatures is revealed as the self-propulsion mechanism. Theoretical analysis of the driving force is highly desirable; currently, most of them are based on a perturbative theory with assuming a weakly curved substrate. However, this ...
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Thermodynamic model of twisted bilayer graphene: Entropy mattersJournal of the Mechanics and Physics of Solids (IF 5.582) Pub Date : 2022-06-03 ,DOI:10.1016/j.jmps.2022.104972Weidong Yan, Langquan Shui, Wengen Ouyang, Ze LiuTwisted bilayer materials have attracted tremendous attention due to their unique and novel properties. In this work, we derive a thermodynamic model for twisted bilayer graphene (tBLG) within the framework of the classical statistical mechanics. The effect of interlayer twist is introduced by the Moiré-dependent out-of-plane deformation, based on which the twist associated Helmholtz free energy is ...
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Peeling mechanics of film-substrate system with mutually embedded nanostructures in the interfaceInternational Journal of Solids and Structures (IF 3.667) Pub Date : 2022-05-24 ,DOI:10.1016/j.ijsolstr.2022.111737Langquan Shui, Weidong Yan, Yujie Zhang, Lihan Xu, Enlai Gao, Ze Liu, Quanshui ZhengThrough mechanical deformation of crystalline metals with hard molds, superplastic nanomolding provides a simple and high-throughput method to directly form nanostructures in the metal surface. The releasing of the molded nanostructures generally involves in chemical etching away the mold, in which metal nanostructures could also be chemically attacked. Therefore, mechanical demoulding is very promising ...
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Fabrication of 3D metallic glass architectures by a mold-strain-set methodMaterials & Design (IF 9.417) Pub Date : 2022-04-20 ,DOI:10.1016/j.matdes.2022.110668Yupeng Wu, Yongping Kang, Yiling Xie, Xiaojian Xiang, Langquan Shui, Jan Schroers, Ze Liu
Metallic glasses (MGs) are considered as promising materials for microelectromechanical systems (MEMS) due to their excellent mechanical properties combined with unique net shape formability. However, the prevalent fabrication of MG MEMS is based on semiconductor micro-manufacturing technology which is limited to 2D. This work introduces a mechanically guided manufacturing method which enables facile
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Experimental decoding of grain boundary-based plastic deformationActa Materialia (IF 9.209) Pub Date : 2021-12-05 ,DOI:10.1016/j.actamat.2021.117534Yupeng Wu, Yujie Zhang, Langquan Shui, Jinsong Wu, Ze LiuHere, we apply the electron backscatter diffraction (EBSD) technique to identify grain boundaries (GBs) in a metal sheet surface, and the metal sheet is subsequently deformed via contact with a hard nanomold. Quantified by the length of molded nanorods, combining with molecular dynamics (MD) simulations and transmission electron microscopy (TEM) characterization, the microstructure evolution and the ...
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Extended deformable tension-shear model for graphene layered materials with non-uniform staggeringJournal of the Mechanics and Physics of Solids (IF 5.582) Pub Date : 2021-11-23 ,DOI:10.1016/j.jmps.2021.104728Yan Chen, Huasong Qin, Huichao Liu, Langquan Shui, Yilun Liu, Xi ChenCurrent theoretical works on the mechanical behaviors of graphene layered materials are usually limited to the regular staggering. But, more practical staggering modes haven't been paid enough attention. In this work, we extend the deformable tension-shear (DTS) model to non-uniform staggering through two different methods, i.e. eigenvalue method and isolated break method. Then, different staggering ...
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Generation of buckling and wrinkling in elastic films: The effect of initial imperfectionPhysical Review E (IF 2.707) Pub Date : 2021-11-09 ,DOI:10.1103/physreve.104.055002Yidu Zhang (张益都), Langquan Shui (税朗泉), Yongshou Liu (刘永寿), Ze Liu (刘泽)The symmetry breaking that is induced by initial imperfection (e.g., geometry or material inhomogeneity and out-of-plane disturbance) is a necessary condition for film buckling. However, the effect of initial imperfection on the buckling behavior is still not clear cut. Herein, given an elastic substrate-free circular film subjected to in-plane compressive stress and arbitrary initial imperfection ...
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Ordered Hierarchical Ag Nanostructures as Surface-Enhanced Raman Scattering Platforms for (Bio)chemical Sensing and Pollutant MonitoringACS Applied Nano Materials (IF 6.14) Pub Date : 2021-10-25 ,DOI:10.1021/acsanm.1c02200Junxiang Xiang, Yunxia Wang, Yupeng Wu, Hui Fang, Langquan Shui, Ze Liu, Tao DingSurface-enhanced Raman scattering (SERS), due to its extreme sensitivity down to the single molecule level, has been a superior analytical technique for (bio)chemical sensing and monitoring. However, the reliability of SERS has been a major issue since its discovery and has not yet been fully addressed, which is largely due to the lack of properly designed SERS substrates and facile, cost-effective ...
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Superplastic Nanomolding of Highly Ordered Metallic Sub-Micrometer Pillars Arrays for Surface Enhanced Raman ScatteringAdvanced Materials Technologies (IF 8.856) Pub Date : 2021-10-08 ,DOI:10.1002/admt.202100891Junxiang Xiang, Yunxia Wang, Yupeng Wu, Qi Peng, Langquan Shui, Wengen Ouyang, Tao Ding, Ze LiuOrdered metallic nanostructures, due to their superior electronic and photonic properties, have played a vital role in wide range of applications, such as metamaterials, plasmonic sensing, electrocatalysis, and energy devices. However, traditional fabrication strategies based on bottom-up self-assembly and top-down lithography are either poor in uniformity or time-consuming with low scalability. Here ...
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On the snake-like lateral un-dulatory locomotion in terrestrial, aquatic and sand environmentsJournal of the Mechanics and Physics of Solids (IF 5.582) Pub Date : 2021-09-05 ,DOI:10.1016/j.jmps.2021.104629Liangliang Zhu, Pengfei Yang, Feng Li, Kai Wang, Langquan Shui, Xi ChenTerrestrial snakes, aquatic snakes, and sandfish lizards are observed to adopt different configurations for locomotion, although they all employ the snake-like un-dulatory wriggling motion. Here we show that these differences may be dominated by the movement and energy efficiencies imposed by mechanical deformation and interaction with environments. Based on a slender soft beam model, a systematical ...
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Mechanical design of an asymmetric-deformation-driven rotating machineryMechanics Research Communications (IF 2.749) Pub Date : 2021-09-03 ,DOI:10.1016/j.mechrescom.2021.103772Zhengzhi Wang, Kun Wang, Qi Peng, Xuhai Tang, Langquan Shui, Ze LiuRotating, as a recurring motion adopted for industrial rotating machinery, has been rarely studied in the development of advanced robotics until recently. The underlying mechanisms that induce the rolling locomotion and the structural and mechanical designs for rotatory machinery remain largely elusive. Herein, we conduct theoretical analyses and numerical simulations for a self-propelled rotating ...
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One-dimensional Sb2Se3 enabling ultra-flexible solar cells and mini-modules for IoT applicationsNano Energy (IF 19.069) Pub Date : 2021-05-07 ,DOI:10.1016/j.nanoen.2021.106101Kanghua Li, Fu Li, Chao Chen, Pengfei Jiang, Shuaicheng Lu, Siyu Wang, Yue Lu, Guoli Tu, Jiaojiao Guo, Langquan Shui, Ze Liu, Boxiang Song, Jiang TangPower supply equipment, employed in the Internet of Things (IoT) for instance, calls for efficient harvesting of solar energy from the environment sustainably. Sb2Se3 enjoys the advantages of unique one-dimensional crystal structure and low-temperature film growth, enabling the fabrication of flexible and lightweight solar cells. Therefore, Sb2Se3 solar cells are expected to have intrinsic advantages ...
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Observation of speeding growth of metal nanowires by ultra-low frequency micro-vibration assisted superplastic nanomoldingMaterials Letters (IF 3.574) Pub Date : 2021-01-01 ,DOI:10.1016/j.matlet.2020.128890Yujie Zhang, Bozhao Wu, Enlai Gao, Langquan Shui, Ze LiuAbstract Superplastic nanomolding (SPNM), a method to directly form nanostructures in metal surface through contact deformation by using a hard mold, provides a toolbox to mold essentially any metals on the nanoscale. Here, by superimposing an ultra-low frequency micro-vibration to the molding pressure, it is interesting to find that the molding efficiency can be drastically increased. Specifically ...
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Direct observation of synchronized 90° domain switching in BaTiO3 crystal during electric field loadingMaterials Letters (IF 3.574) Pub Date : 2021-01-01 ,DOI:10.1016/j.matlet.2020.128706Dapeng Zhu, Xiangyang Cheng, Chunwen Yang, Langquan Shui, Yingwei LiAbstract We in-situ investigated the domain switching processes in BaTiO3 (BT) crystals by a fast camera combined with a polarized light microscope. The domain nucleation and domain wall motion processes were recorded. Our results reveal that under dynamic electric field loading, the polarization reorientation was mainly dominated by 90° domain nucleation and forward domain wall motion, instead of ...
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Extraordinary Electromechanical Actuation of Ti2C MXeneThe Journal of Physical Chemistry C (IF 4.177) Pub Date : 2020-12-23 ,DOI:10.1021/acs.jpcc.0c09482Bozhao Wu, Xiaoxi Cai, Langquan Shui, Enlai Gao, Ze LiuTwo-dimensional transition-metal carbides and nitrides, often known as MXenes, have fantastic properties benefiting from their unique structures, enabling them to be used in many applications. In this work, we show that Ti2C MXene possesses extraordinary electromechanical actuation performance using first-principles calculations. Upon charge injection, the maximum uniaxial and biaxial isometric actuation ...
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Spatio-temporal modulated composite metamaterials by using switchable mesostructural topologyComposite Structures (IF 6.603) Pub Date : 2020-11-01 ,DOI:10.1016/j.compstruct.2020.112601Langquan Shui, Jiaojiao Guo, Enlai Gao, Ze LiuAbstract Spatio-temporally modulated composite metamaterials (STMCMs) possess tunable and nearly “full-banded” asymmetrical elastic wave properties, making them highly promising for uses in a wide range of applications, such as cloaking, acoustic information processing, ideal vibration isolation, ultrasonic technology. Despite much progress made in the structural design and fabrication of intelligent ...
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Surface wave mechanism for directional motion of droplet on obliquely vibrated substrate: The effects of the excitation frequency and amplitudeExtreme Mechanics Letters (IF 4.728) Pub Date : 2020-10-07 ,DOI:10.1016/j.eml.2020.101025Jiao-Jiao Guo, Langquan Shui, Xiao-Peng ChenSurface waves have been introduced to explore the directional motion (DM) mechanism of a droplet on an obliquely vibrated substrate (Guo et al., Phys. Fluids, 2020), where the surface wave was decomposed for analysis by using a proper orthogonal decomposition (POD) method. In this work, the elaborate responses of the POD modes are explored given varying excitation frequency (f) and amplitude. It is ...
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Rapid and continuous regulating adhesion strength by mechanical micro-vibration.Nature Communications (IF 17.694) Pub Date : 2020-03-27 ,DOI:10.1038/s41467-020-15447-xLangquan Shui,Laibing Jia,Hangbo Li,Jiaojiao Guo,Ziyu Guo,Yilun Liu,Ze Liu,Xi Chen
Controlled tuning of interface adhesion is crucial to a broad range of applications, such as space technology, micro-fabrication, flexible electronics, robotics, and bio-integrated devices. Here, we show a robust and predictable method to continuously regulate interface adhesion by exciting the mechanical micro-vibration in the adhesive system perpendicular to the contact plane. An analytic model reveals
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High-performance phosphorene electromechanical actuatorsnpj Computational Materials (IF 12.256) Pub Date : 2020-03-20 ,DOI:10.1038/s41524-020-0297-6Bozhao Wu, Hui-Xiong Deng, Xiangzheng Jia, Langquan Shui, Enlai Gao, Ze Liu
Phosphorene, a two-dimensional material that can be exfoliated from black phosphorus, exhibits remarkable mechanical, thermal, electronic, and optical properties. In this work, we demonstrate that the unique structure of pristine phosphorene endows this material with exceptional quantum-mechanical performance by using first-principles calculations. Upon charge injection, the maximum actuation stress
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Surface wave mechanism for directional motion of droplet on an obliquely vibrated substratePhysics of Fluids (IF 4.98) Pub Date : 2020-03-02 ,DOI:10.1063/1.5143874Jiao-Jiao Guo, Xiao-Peng Chen, Langquan Shui
The directional motion of a two-dimensional droplet on an obliquely vibrated substrate is studied numerically. The time dependent droplet profile is decomposed by using a proper orthogonal decomposition (POD) method. Two dominant POD modes of the capillary wave are identified. The first mode is quasi-harmonic, which leads to an apparent wetted area difference between uphill and downhill stages of the
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Controlled Fabrication of Gold Nanotip Arrays by Nanomolding-Necking TechnologyNanotechnology (IF 3.953) Pub Date : 2020-01-17 ,DOI:10.1088/1361-6528/ab62cbGuoxing Han, Yupeng Wu, Weidong Yan, Langquan Shui, Xiangzheng Jia, Enlai Gao, Minqiang Jiang, Ze LiuThe fabrication of nanotips has been driven by the increasing industrial demands in developing high-performance multifunctional nanodevices. In this work, we proposed a controlled, rapid as well as low cost nanomolding-necking technology to fabricate gold nanotips arrays. The geometries of gold nanotips with cone angle range of ~28-84° and curvature radii of < 5 nm can be prepared by tailoring the ...
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Acoustic actuators based on the resonance of an acoustic-film system applied to the actuation of soft robotsJournal of Sound and Vibration (IF 4.761) Pub Date : 2018-10-01 ,DOI:10.1016/j.jsv.2018.06.020Langquan Shui, Liangliang Zhu, Yilun Liu, Xi ChenAbstract In this work, the coupling between an acoustic field and a soft film is studied and applied to the actuation of soft robots. First, the natural frequencies and modes for the acoustic-film coupling system are theoretically and numerically calculated. The steady-state solution of the acoustic-film coupling field is then obtained based on the Green's function method. By actuating standing waves ...
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Mechanisms of electromechanical wrinkling for highly stretched substrate-free dielectric elastic membraneJournal of the Mechanics and Physics of Solids (IF 5.582) Pub Date : 2018-09-27 ,DOI:10.1016/j.jmps.2018.09.034Langquan Shui, Yilun Liu, Bo Li, Chenbang Zou, Chao Tang, Liangliang Zhu, Xi ChenIn this work, the electromechanical wrinkling of a highly stretched substrate-free dielectric elastic membrane is theoretically and experimentally studied. Considering the hyperelasticity, anisotropy of the bending stiffness, and electromechanical coupled deformation of the dielectric elastic membrane, a general theoretical model for the wrinkling of a pre-stretched substrate-free membrane is developed ...
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Snell's law of elastic waves propagation on moving property interface of time-varying materialsInternational Journal of Solids and Structures (IF 3.667) Pub Date : 2018-06-01 ,DOI:10.1016/j.ijsolstr.2018.02.013Langquan Shui, Yilun Liu, Xi Chen
Abstract In this work, Snell's law of elastic waves on the moving property interface (MPI) of time-varying materials has been studied. First, additional constraints of the elastic wave propagation on MPI are proposed to ensure self-consistence of Snell's law. Second, based on Huygens principle, a geometric approach is developed which can be used to geometrically reveal the wave propagation directions
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Energy efficiency of mobile soft robotsSoft Matter (IF 4.046) Pub Date : 2017-10-13 ,DOI:10.1039/c7sm01617dLangquan Shui,Liangliang Zhu,Zhe Yang,Yilun Liu,Xi ChenThe performance of mobile soft robots is usually characterized by their locomotion/velocity efficiency, whereas the energy efficiency is a more intrinsic and fundamental criterion for the performance evaluation of independent or integrated soft robots. In this work, a general framework is established to evaluate the energy efficiency of mobile soft robots by considering the efficiency of the energy ...
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