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Journal of Bionic Engineering 2020年第3期17卷 436-447页

作者： Nan Zhang Chun Huang Jiaqian Li Ling Kang huanxi zheng Yaqin He Zuankai Wang Xiaofeng Zhou Jian Zhang Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic EngineeringEast China Normal UniversityShanghai 200241China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Shanghai Institute of Intelligent Electronics Systems Fudan UniversityShanghai 200433China

Wettability plays a vital role in fundamental researches and practical *** control and patterning have been widely studied in various *** researches have grown rapidly,the methods are still restricted by limitations including complicated processes,high equipment requirements and shortage of methods to treat complex *** we report a simple,low cost,array-based wettability control and patterning method via in-situ modification by flexible plasma *** control and patterning on surfaces of superhydrophobic aluminum,superhydrophobic PDMS and silicon,even plant leaf and fruit are *** relationships between the wettability and the treatment time are *** elucidate that the wetting states can also be *** surface modification mechanism of in-situ plasma treatment is further *** the step by step treatment,gradient and arbitrary wettability patterning on surfaces have been ***,the patterned wettability on the inner surface of a tube has been realized,which has never been ***,in-situ wettability patterning is applied to achieve microfluidics channels on the inner surface of superhydrophobic *** work will bring new insights into the study of wetting field and stimulate more applications on wettability control and patterning.

关键词： wettability control patterning in-situ modification flexible plasma stamp atmospheric

SLIPS-TENG: robust triboelectric nanogenerator with optical and charge transparency using a slippery interface

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National Science Review 2019年第3期6卷 540-550页

作者： Wanghuai Xu Xiaofeng Zhou Chonglei Hao huanxi zheng Yuan Liu Xiantong Yan zhengbao Yang Michael Leung Xiao Cheng Zeng Ronald X.Xu Zuankai Wang Department of Mechanical Engineering City University of Hong Kong Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electronic Engineering East China Normal University Department of Chemistry University of Nebraska-Lincoln School of Energy and Environment City University of Hong Kong Department of Materials Science and Engineering City University of Hong Kong

Energy harvesting devices that prosper in harsh environments are highly demanded in a wide range of applications ranging from wearable and biomedical devices to self-powered and intelligent ***, over the past several years, the innovation of triboelectric nanogenerators(TENGs) that efficiently convert ambient kinetic energy of water droplets or wave power to electricity has received growing attention. One of the main bottlenecks for the practical implications of such devices originates from the fast degradation of the physiochemical properties of interfacial materials under harsh environments. To overcome these challenges, here we report the design of a novel slippery lubricant-impregnated porous surface(SLIPS) based TENG, referred to as SLIPS-TENG, which exhibits many distinctive advantages over conventional design including optical transparency, configurability, self-cleaning, flexibility, and power generation stability, in a wide range of working environments. Unexpectedly, the slippery and configurable lubricant layer not only serves as a unique substrate for liquid/droplet transport and optical transmission,but also for efficient charge transfer. Moreover, we show that there exists a critical thickness in the liquid layer, below which the triboelectric effect is almost identical to that without the presence of such a liquid film. Such an intriguing charge transparency behavior is reminiscent of the wetting transparency and van der Waals potential transparency of graphene previously reported, though the fundamental mechanism remains to be elucidated. We envision that the marriage of these two seemingly totally different arenas(SLIPS and TENG) provides a paradigm shift in the design of robust and versatile energy devices that can be used as a clean and longer-lifetime alternative in various working environments.

关键词： slippery surface triboelectricity power generation water droplet interfaces

A droplet‐based electricity generator with ultrahigh instantaneous output and short charging time

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Droplet 2022年第1期1卷 56-64页

作者： Nan Zhang Huimin Zhang Wanghuai Xu Haojie Gu Shimeng Ye huanxi zheng Yuxin Song Zuankai Wang Xiaofeng Zhou Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic EngineeringEast China Normal UniversityShanghaiChina Department of Mechanical Engineering City University of Hong KongHong KongChina

The past several years have witnessed the rapid development in effectively transforming randomly distributed water kinetic energy into electrical energy,especially triggered by the emergence of droplet‐based electricity generators(DEG).Despite this,it still suffers from relatively low average power density,which is also achieved at the cost of long charging time,the time to reach stable and saturated surface charge density either through continuous droplet impingement or *** the harvested energy per droplet in DEG remains as the dominant metric,ultrahigh instantaneous output and short charging time are equally important in some specialized applications such as instantaneous ***,we conduct systematical modeling and optimization to build the link between the hydrodynamic and electrical systems,which enables us to determine ultrahigh instantaneous output and short charging time by tailoring parameters such as dielectric layer thickness,droplet ion concentration,and external *** envision that this strategy in achieving ultrahigh instantaneous output as well as shortening charging time would provide insights and design routes for water energy harvesting.

关键词： specialized charging generator

Achieving ultra-stable and superior electricity generation by integrating transistor-like design with lubricant armor

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The Innovation 2022年第5期3卷 122-128页

作者： Yuxin Song Wanghuai Xu Yuan Liu huanxi zheng Miaomiao Cui Yongsen Zhou Baoping Zhang Xiantong Yan Lili Wang Pengyu Li Xiaote Xu zhengbao Yang Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Research Center for Nature-Inspired Engineering City University of Hong KongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Extensive work have been done to harvest untapped water energy in formats of raindrops,flows,waves,and ***,attaining stable and efficient electricity generation from these low-frequency water kinetic energies at both individual device and large-scale system level remains challenging,partially owing to the difficulty in designing a unit that possesses stable liquid and charge transfer properties,and also can be seamlessly integrated to achieve preferential collective performances without the introduction of tortuous wiring and redundant node connection with external ***,we report the design of water electricity generators featuring the combination of lubricant layer and transistor-like electrode architecture that endows enhanced electrical performances in different working *** a design is scalable in manufacturing and suitable for facile integration,characterized by significant reduction in the numbers of wiring and nodes and elimination of complex interfacing problems,and represents a significant step toward large-scale,real-life applications.

关键词： integrating collective electricity

A droplet‐based electricity generator incorporating Kelvin water dropper with ultrahigh instantaneous power density

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Droplet 2024年第1期3卷 95-102页

作者： Yang Li Xuezhi Qin Yawei Feng Yuxin Song Zhiran Yi huanxi zheng Peiyang Zhou Chenyang Wu Siyan Yang Lili Wang Pingan Zhu Wanghuai Xu Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Harvesting renewable water energy in various formats such as raindrops,waves,and evaporation is one of the key strategies for achieving global carbon *** recent decade has witnessed rapid advancement of the droplet‐based electricity generator(DEG)with a continuous leap in the instantaneous output power density from 50W/m2 to several kW/*** this,further pushing the upper limit of the output performance of DEG is still constrained by low surface charge density and long precharging ***,we report a DEG incorporating the Kelvin water dropper(K‐DEG)that can generate an ultrahigh instantaneous power density of 105W/m2 upon one droplet *** this design,the Kelvin water dropper continuously replenishes the high density of surface charges on DEG,while DEG fully releases these surface charges into electric output.K‐DEG with such a high output can directly light five 6‐W commercial lamps and even charge a cellphone by using falling droplets.

关键词： generator ultrahigh power

Electronic Skin from High-Throughput Fabrication of Intrinsically Stretchable Lead Zirconate Titanate Elastomer

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Research 2020年第1期2020卷 1-11页

作者： Yiming Liu huanxi zheng Ling Zhao Shiyuan Liu Kuanming Yao Dengfeng Li Chunki Yiu Shenghan Gao Raudel Avila Pakpong Chirarattananon Lingqian Chang Zuankai Wang Xian Huang Zhaoqian Xie zhengbao Yang Xinge Yu Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Biomedical Engineering Tianjin UniversityTianjin 300000China Department of Mechanical Engineering McCormick School of EngineeringNorthwestern UniversityEvanstonIL 60208USA School of Biology Science and Medical Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China

Electronic skin made of thin,soft,stretchable devices that can mimic the human skin and reconstruct the tactile sensation and perception offers great opportunities for prosthesis sensing,robotics controlling,and human-machine *** materials and mechanics engineering of thin film devices has proven to be an efficient route to enable and enhance flexibility and stretchability of various electronic skins;however,the density of devices is still low owing to the limitation in existing fabrication ***,we report a high-throughput one-step process to fabricate large tactile sensing arrays with a sensor density of 25 sensors/cm^(2) for electronic skin,where the sensors are based on intrinsically stretchable piezoelectric lead zirconate titanate(PZT)*** PZT elastomer sensor arrays with great uniformity and passive-driven manner enable highresolution tactile sensing,simplify the data acquisition process,and lower the manufacturing *** high-throughput fabrication process provides a general platform for integrating intrinsically stretchable materials into large area,high device density soft electronics for the next-generation electronic skin.

关键词： enable Skin integrating

Corrosion Behavior of Mg_(65)Cu_(25-x) Zn_xGd_(10)(x=0, 5) Metallic Glass

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Journal of Wuhan University of Technology(Materials Science) 2008年第5期23卷 678-682页

作者：李国强 School of Materials Science and Engineering Beijing University of Aeronautics & Astronautics

The effect of substitutional element Zn on corrosion behavior of Mg65Cu25Gd10 glass was investigated. The amorphous structure of Mg65Cu25-xZnxGd10 （x=0,5） alloys were examined by X-ray diffractometry and differential scanning calorimetry （DSC）. The dissolution rates of Mg65Cu25-xZnxGd10 （x=0, 5） metallic glasses in a 5 wt% NaCl solution with pH value of 7 were determined by a hydrogen evolution testing method. The corrosion behavior of these alloys was characterized using dipping tests with 5 wt% NaCl, in combination with electrochemical measurements and scanning electron microscopy （SEM）. Results show that the anti-corrosion ability of Mg65Cu25Gd10 alloy is significantly improved due to the addition of Zn. Possible mechanism responsible for the improvement is discussed.

关键词： Mg-based metallic glass corrosion behavior corrosion resistance dissolution rate

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Structure Relaxation of Mg_(65)Cu_(25)Gd_(10) Metallic Glass and Its Effect on Strength

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Journal of Wuhan University of Technology(Materials Science) 2009年第2期24卷 210-213页

作者：李国强 School of Materials Science & Engineering Beijing University of Aeronautics and Astronautics China Perfect Machinery Industry Corp. Ltd

To identify the re-arrangement of constituent atoms of an amorphous Mg65Cu25Gd10 alloy happened with annealing, structure relaxation of the alloy was investigated as a function of an- nealing time at 373 K through extended X-ray absorption fine structure （EXAFS） analysis procedures. To understand the effect of structure relaxation on strength, compression tests were conducted for both the as-cast and the annealed Mg65Cu25Gd10 samples. It is found that short range order around Cu and Gd atoms exhibits different variation trends with increasing annealing time at 373 K, though the structure of the alloy still remains to be amorphous. Based on the fact that the strength of the alloy first exhibits a reduction and then a recovery with annealing time, it is suggested that the enhancement of short range order around Cu should be responsible for the strength reduction, while the enhancement of short range order around Gd should be responsible for the strength recovery.

关键词： Mg-based metallic glass structure relaxation strength annealing

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Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng zheng Wang Zhou Ying Mo Biao zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy Co. LTD.

Hard carbon （HC） has been considered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy （FTIR/EIS） and X-ray photoelectron spectroscopy （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectroscopy

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei zheng Tingwei Cao Qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

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