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Recent advances in gecko adhesion and friction mechanisms and development of gecko-inspired dry adhesive surfaces

Friction 2013年第2期1卷 114-129页

作者： Ming ZHOU noshir pesika Hongbo ZENG Yu TIAN Jacob ISRAELACHVILI State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Chemical and Biomolecular Engineering Department Tulane UniversityNew OrleansLA 70118USA Department of Chemical and Materials Engineering University of AlbertaEdmontonABT6G 2V4Canada Department of Chemical Engineering Materials Research LaboratoryUniversity of CaliforniaSanta BarbaraCalifornia 93106USA Institute of Mechanical Manufacturing Technology China Academy of Engineering PhysicsMianyang621900China

The remarkable ability of geckos to climb and run rapidly on walls and ceilings has recently received considerable interest from many *** progress has been made in understanding the attachment and detachment mechanisms and the fabrication of articulated gecko-inspired adhesives and structured *** article reviews the direct experiments that have investigated the properties of gecko hierarchical structures,i.e.,the feet,toes,setae,and spatulae,and the corresponding models to ascertain the mechanical principles *** in this review are reports on gecko-inspired surfaces and structures with strong adhesion forces,high ratios of adhesion and friction forces,anisotropic hierarchical structures that give rise to directional adhesion and friction,and“intelligent”attachment and detachment motions.

关键词： gecko feet surfaces setae spatulae anisotropic dry adhesion and friction articulated motion

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Propulsion Principles of Water Striders in Sculling Forward through Shadow Method

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Journal of Bionic Engineering 2018年第3期15卷 516-525页

作者： Hongyu Lu Yelong Zheng Wei Yin Dashuai Tao noshir pesika Yonggang Meng Yu Tian State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Precision Measuring Technology and Instrument Tianjin University Tianjin 300072 China Lubrication and Friction Testing Center Tianjin Research Institute for Advanced Equipment Tsinghua University Tianjin 300300 China Chemical & Biomolecular Engineering Department Tulane University New Orleans 70112 USA

Semi-aquatic arthropods skate on water surfaces with synergetic actions of their legs. The sculling forward locomotion of water striders was observed and analyzed in situ to understand and reproduce the abovementioned feature. The bright-edged elliptical shadows of the six legs of a water strider were recorded to derive the supporting force distributions on legs. The propulsion principles of water striders were quantitatively disclosed. A typical sculling forward process was accomplished within approximately 0.15 s. Water striders lifted their heads slightly and supported their weight mainly by the two driving legs to increase the propulsion force and reduce the water resistance during the process. The normalized thrust-area ratio （defined as the ratio of the propulsion force to the projected area） was usually lower than 0.4 after sculling for approximately 0.08 s. The entire normal supporting force remained nearly constant during a stroke to reduce the mass center fluctuation in the normal direction. In addition, water striders could easily control the locomotion direction and speed through the light swinging of the two hind legs as rudders. These sculling principles might inspire sophisticated biomimetic wa- ter-walking robots with high propulsion efficiency in the future.

关键词： shadow method water strider sculling forward locomotion propulsion principle

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Quantification/mechanism of interfacial interaction modulated by electric potential in aqueous salt solution

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Friction 2021年第3期9卷 513-523页

作者： Shaowei LI Pengpeng BAI Yuanzhe LI noshir Spesika Yonggang MENG Liran MA Yu TIAN State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Department of Chemical and Biomolecular Engineering Tulane UniversityNew OrleansLA 70118USA

With the development of surface and interface science and technology,methods for the online modulation of interfacial performance by external stimuli are in high *** between ultra-low and high friction states is a particular goal owing to its applicability to the development of precision machines and nano/micro-electromechanical *** this study,reversible switching between superlubricity and high friction is realized by controlling the electric potential of a gold surface in aqueous salt solution sliding against a SiO_(2) *** positive potential results creates an ice-like water layer with high hydrogen bonding and adhesion at the interface,leading to nonlinear high ***,applying negative potential results in free water on the gold surface and negligible adhesion at the interface,causing linear ultra-low friction(friction coefficient of about 0.004,superlubricity state).A quantitative description of how the external load and interfacial adhesion affected friction force was developed,which agrees well with the experimental ***,this work quantitatively reveals the mechanism of potential-controlled switching between superlubricity and high-friction *** the interfacial behavior via the electric potential could inspire novel design strategies for nano/micro-electromechanical and nano/micro-fluidic systems.

关键词： electrochemical potential reversible switching superlubricity nonlinear friction adhesion

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基于织构表面的摩擦静电发电机制备及其输出性能研究

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物理学报 2016年第6期65卷 1-8页

作者：程广贵张伟方俊蒋诗宇丁建宁 noshir S.pesika 张忠强郭立强王莹江苏大学微纳米科学技术研究中心镇江212013 常州大学江苏省光伏科学与工程协同创新中心常州213164 杜兰大学分子与生物工程系美国新奥尔良70118

摩擦电纳米发电机(TENG)是基于摩擦生电和静电感应复合原理将机械能转换为电能的一种新型能源获取方式.本文采用模板法制备了几种不同参数的聚二甲基硅氧烷(PDMS)微圆柱结构,并组装成TENG,实验研究了接触区表面积、外加载荷对TENGs输出... 详细信息

摩擦电纳米发电机(TENG)是基于摩擦生电和静电感应复合原理将机械能转换为电能的一种新型能源获取方式.本文采用模板法制备了几种不同参数的聚二甲基硅氧烷(PDMS)微圆柱结构,并组装成TENG,实验研究了接触区表面积、外加载荷对TENGs输出性能的影响.结果表明,圆形微柱阵列的存在有效提高了TENG的作用面积及电输出性能,相同载荷下,电输出随微柱间距离减小而增加,在间距为15μm、载荷为5 N时,输出的平均开路电压和短路电流分别为88 V和15μA,是同等条件下、微柱间距为50μm电输出的1.5倍以上;电输出随载荷增加呈准线性增加,ANSYS软件模拟载荷作用下PDMS微圆柱织构的变形行为,结果表明,压力作用下,微圆柱主要发生压缩变形,基底的变形导致微柱与上电极之间产生侧向摩擦,从而产生更多电荷,提升了电输出性能.

关键词：摩擦电纳米发电机摩擦生电微柱 ANSYS

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