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slippery surface of Nepenthes alata Pitcher： The Role of Lunate Cell and Wax Crystal in Restricting Attachment Ability of Ant Camponotus japonicus Mayr

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Journal of Bionic Engineering 2016年第3期13卷 373-387页

作者： Lixin Wang Shiyun Dong Qiang Zhou College of Mechanical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China National Key Laboratory for Remanufacturing Academy of Armord Forces Engineering Beijing 100072 China Department of Mechatronic Engineering China Agricultural Universing Beijing 100083 China

This study attempts to investigate how the slippery surface of Nepenthes alata pitchers restricts the attachment ability of ant Camponotus japonicus Mayr, via climbing behavior observation and friction force measurement. Ants exhibited ineffective climbing behaviors and rather small friction forces when attached to upward-oriented slippery surfaces, but opposite phenomena were shown when on inverted surfaces. Friction forces of intact, claw tip-removed and pad-destroyed ants were measured on intact and de-waxed slippery surfaces, exploring the roles of wax crystals and lunate cells in restricting ant＇s attachment. On downward-directed slippery surfaces, greater forces were exhibited by intact and pad-destroyed ants; on the two slippery sur- faces, pad-destroyed ants presented slightly smaller forces and clawless ants generated considerably smaller forces. Somewhat different force was provided by clawless ants on upward and downward oriented slippery surfaces, and slightly higher force was shown when ants climbed on wax-removed surface. Results indicate that the lunate cells contribute greatly to decrease the friction force, whereas the wax crystals perform a supplementary role. Mechanical analysis suggests that the directionally growing lunate cells possess a sloped structure that effectively prevents the claw＇s mechanical interlock, reducing the ant＇s attachment ability considerably. Our conclusion supports a further interpretation of slippery surface＇s anti-attachment mecha- nism, also provides theoretical reference to develop biomimetic slippery plate to trap agricultural insect.

关键词： biotribology Nepenthes alata pitcher slippery surface lunate cell wax crystal ant Camponotusjaponicus Mayr

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slippery surface with Petal-like Structure for Protecting Al Alloy: Anti-corrosion, Anti-fouling and Anti-icing

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Journal of Bionic Engineering 2022年第1期19卷 83-91页

作者： Junfei Huang Jiajie Kang Jiaxu Zhang Jinxia Huang Zhiguang Guo School of Engineering and Technology China University of GeosciencesBeijing100083China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou451283China

The harsh working environment affects the performance and usage life of Al and its alloys,thus limiting their *** recent years,slippery Liquid-infused Porous surface(SLIPS)has attracted much attention due to excellent anti-corrosion,anti-fouling and anti-icing *** may be an effective way to improve the properties of Al and its ***,the SLIPS with petal-like structure was constructed on the Al alloy via simple hydrothermal reaction,Stearic Acid(STA)modification and lubricant injection.A variety of droplets(including oil-in-water emulsions)can slide on the SLIPS at a low angle,even the Sliding Angle(SA)of the water droplet is only 3°.Furthermore,the SLIPS exhibits outstanding mechanical and chemical *** can maintain fine oil-locking ability under high shearing force and keep slippery stability after immersion in acid/alkaline *** addition,the SLIPS possesses excellent anti-corrosion,anti-fouling and anti-icing properties,which provides a new way to promote the application of Al and its ***,the SLIPS is expected to be an effective way to improve the properties of Al and its alloys,as well as play a role in anti-fouling and self-cleaning in construction,shipbuilding and automotive manufacturing industries,thereby expanding the practical application of Al and its alloys.

关键词： slippery surface Al alloy Anti-corrosion Anti-fouling Anti-icing

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Smart Manipulation of Gas Bubbles in Harsh Environments Via a Fluorinert-Infused Shape-Gradient slippery surface

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Transactions of Tianjin University 2020年第6期26卷 441-449页

作者： Guoliang Liu Chunhui Zhang Mengfei Liu Ziwei Guo Xinsheng Wang Cunming Yu Moyuan Cao Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Laboratory of Bio-inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300354China

Fundamental research and practical applications have examined the manipulation of gas bubbles on open surfaces in lowsurface-tension,high-pressure,and high-acidity,-alkalinity,or-salinity ***,to the best of our knowledge,effi cient and general approaches to achieve the smart manipulation of gas bubbles in these harsh environments are ***,a Fluorinert-infused shape-gradient slippery surface(FSSS)that could eff ectively regulate the behavior of gas bubbles in harsh environments was successfully *** unique capability of FSSS was mainly attributed to the properties of Fluorinert,which include chemical inertness and *** shape-gradient morphology of FSSS could induce asymmetric driving forces to move gas bubbles directionally on open *** infl uencing gas bubble transport on FSSS,such as the apex angle of the slippery surface and the surface tension of the aqueous environment,were carefully investigated,and large apex angles were found to result in large initial transport velocities and short transport *** the surface tension of the aqueous environment is unfavorable to bubble ***,FSSS could transport gas bubbles in aqueous environments with surface tensions as low as 28.5±0.1 mN/m,which is lower than that of many organic solvents(e.g.,formamide,ethylene glycol,and dimethylformamide).In addition,FSSS could also realize the facile manipulation of gas bubbles in various aqueous environments,e.g.,high pressure(~6.8 atm),high acidity(1 mol/L H 2 SO 4),high alkalinity(1 mol/L NaOH),and high salinity(1 mol/L NaCl).The current fi ndings provide a source of knowledge and inspiration for studies on bubble-related interfacial phenomena and contribute to scientifi c and technological developments for controllable bubble manipulation in harsh environments.

关键词： slippery surface Shape-gradient Asymmetric driving force Smart bubble transport Harsh environment

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Triboelectric‘electrostatic tweezers'for manipulating droplets on lubricated slippery surfaces prepared by femtosecond laser processing

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International Journal of Extreme Manufacturing 2024年第3期6卷 411-426页

作者： Jiale Yong Xinlei Li Youdi Hu Yubin Peng Zilong Cheng Tianyu Xu Chaowei Wang Dong Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefei 230027People’s Republic of China

The use of‘Electrostatic tweezers'is a promising tool for droplet manipulation,but it faces many limitations in manipulating droplets on superhydrophobic ***,we achieve noncontact and multifunctional droplet manipulation on Nepenthes-inspired lubricated slippery surfaces via triboelectric electrostatic tweezers(TETs).The TET manipulation of droplets on a slippery surface has many advantages over electrostatic droplet manipulation on a superhydrophobic *** electrostatic field induces the redistribution of the charges inside the neutral droplet,which causes the triboelectric charged rod to drive the droplet to move forward under the electrostatic *** or negatively charged droplets can also be driven by TET based on electrostatic attraction and *** enables us to manipulate droplets under diverse conditions,including anti-gravity climb,suspended droplets,corrosive liquids,low-surface-tension liquids(*** with a surface tension of 22.3 mN·m^(-1)),different droplet volumes(from 100 nl to 0.5 ml),passing through narrow slits,sliding over damaged areas,on various solid substrates,and even droplets in an enclosed *** droplet-related applications,such as motion guidance,motion switching,droplet-based microreactions,surface cleaning,surface defogging,liquid sorting,and cell labeling,can be easily achieved with TETs.

关键词： triboelectric electrostatic tweezer droplet manipulation slippery surface superhydrophobic surface femtosecond laser

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Carnivorous plants inspired shape-morphing slippery surfaces

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Opto-Electronic Advances 2023年第1期6卷 27-37页

作者： Dong-Dong Han Yong-Lai Zhang Zhao-Di Chen Ji-Chao Li Jia-Nan Ma Jiang-Wei Mao Hao Zhou Hong-Bo Sun State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Carnivorous plants,for instance,Dionaea muscipula and Nepenthes pitcher plant,inspired the innovation of advanced stimuli-responsive actuators and lubricant-infused slippery surfaces,***,hybrid bionic devices that combine the active and passive prey trapping capabilities of the two kinds of carnivorous plants remain a ***,we report a moisture responsive shape-morphing slippery surface that enables both moisture responsive shapemorphing and oil-lubricated water repellency for simultaneous active-and passive-droplet *** moisture deformable slippery surface is prepared by creating biomimetic microstructures on graphene oxide(GO)membrane via femtosecond laser direct writing and subsequent lubricating with a thin layer of oil on the laser structured reduced GO(LRGO)*** integration of a lubricant-infused slippery surface with an LRGO/GO bilayer actuator endows the actuator with droplet sliding ability and promotes the moisture deformation performance due to oil-enhanced water repellency of the inert layer(LRGO).Based on the shape-morphing slippery surface,we prepared a series of proof-of-concept actuators,including a moisture-response Dionaea muscipula actuator,a smart frog tongue,and a smart flower,demonstrating their versatility for active/passive trapping,droplet manipulation,and sensing.

关键词： femtosecond laser fabrication graphene oxide moisture responsive actuators slippery surface bionic devices

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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

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Investigation of the Anisotropic Morphology-Induced Effects of the slippery Zone in Pitchers of Nepenthes alata

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Journal of Bionic Engineering 2015年第1期12卷 79-87页

作者： Pengfei Zhang Huawei Chen Deyuan Zhang School of Mechanical Engineering and Automation Beihang University Beijing 100191 China

Plant of carnivorous genus Nepenthes alata has evolved specific pitchers to prey insects for survival in the barren habitat, especially its slippery zone. The excellent slippery function has received considerable interest because of its potential applica- tion in antifriction surface design. The surface morphologies of intact and de-waxed slippery zones were characterized using scanning electron microscope and scanning white-light interferometer. Hierarchical structures with anisotropic micro- lunate structure and nano- wax crystals were found on the slippery zone. Due to the hierarchical structures, the slippery zone is hy- drophobic. It shows a significant anisotropic wettability with static contact angles 153.3° and 140.1° in the directions perpen- dicular and parallel to the upward direction （toward the peristome）, respectively. The sliding angles are -3° and -10° in the downward and upward directions, respectively. Crawling experiments indicate that the microscopic surface roughness and the brittleness of the wax crystals may reduce insect attachment in different modes according to the insect mass differences. Moreover, artificial slippery surfaces inspired by the slippery zone of Nepenthes alata were fabricated. Traction experiments quantitatively verified that the friction force of replicated lunate structures with Ra-2.54 μm surface roughness was reduced by about 25% as compared to flat surface with Ra-0.56 μm surface roughness for cricket claws.

关键词： biomimetic surface anisotropic wettability antifriction slippery surface Nepenthes alata

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Investigation of Anticorrosive Performance of Oil-infused slippery and Superhydrophobic Brass surfaces by Laser Texturing

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Journal of Bionic Engineering 2021年第5期18卷 1157-1167页

作者： Li Zhang Chong Zhang Jingrong Tang Bo Hao Mingyang Wang Key Laboratory of Vibration and Control of Aeronautical Power Equipment of Ministry of Education Northeastern University at QinhuangdaoQinhuangdao 066004China

Brass is widely used in machinery,electronic appliances and emerging *** corrosion resistance of laser-induced superhydrophobic surface of brass needs to be *** recent years,bionic surface with slippery coating has attracted much attention because of its excellent corrosion inhibition ***,we first prepared the superhydrophobic surface of brass by nanosecond laser ablation combined with fluoroalkyl silane modification,and then injected silicone oil into the prepared superhydrophobic matrix to obtain a slippery coating *** and EIS tests in 3.5 wt.%NaCl solution showed that the corrosion resistance of the slippery surface was better than that of the superhydrophobic *** study can play a certain role in promoting the development of metal anticorrosive coating and is of great significance in the preparation of slippery surface by laser induction,and provides a convenient and eff ective means for metal anticorrosion in the industrial field.

关键词： Nanosecond laser Superhydrophobic slippery surface Corrosion resistance

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Spontaneous Self-healing Bio-inspired Lubricant-infused Coating on Pipeline Steel Substrate with Reinforcing Anti-corrosion,Anti-fouling,and Anti-scaling Properties

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Journal of Bionic Engineering 2022年第6期19卷 1601-1614页

作者： Hao Li Yujie Peng Kai Zhang Pengchang Li Lei Xin Xiaoli Yin Sirong Yu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao266590China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of Petroleum(East China)Qingdao266580China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao266580China

Superhydrophobic surfaces(SHS)and slippery lubricant-infused porous surfaces(SLIPS)attract great attention due to their multiple properties in both industries and our daily ***,we first fabricated the SHS with micro-scale flower-like structures composed of nano-sheets on pipeline steel ***,we obtained the SLIPS by spin-coating lubricant into gaps of micro-scale flower-like structures,with the air still trapped among gaps of *** SLIPS shows excellent liquid repellency as the *** SLIPS also shows stability after the scour of flowing *** results of polarization curves(Tafel)and electrochemical impedance spectroscopies deduced the SLIPS with better and more stable anti-corrosion property than the *** with the SHS,the lack of attachment and CaCO_(3) on the SLIPS indicates that the SLIPS demonstrates better anti-fouling and anti-scaling properties than the ***,the SLIPS shows promising wear resistance under the abrasion simulated by sandpaper compared with the ***,the air trapped among nano-sheets is conducive to the lubricant flowing to the surface quickly,exhibiting spontaneous self-healing in atmosphere,even if part flower-like structures of the SLIPS subject to damage with the lubricant consumed after scratched.

关键词： Pipeline steel Bioinspiration slippery surface Self-healing

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Oleophobic interaction mediated slippery organogels with ameliorated mechanical performance and satisfactory fouling-resistance

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Journal of Materials Science & Technology 2022年第26期121卷 227-235页

作者： Liangpeng Zeng Hongyuan Cui Huilan Peng Xiaohang Sun Yi Liu Jingliang Huang Xinxing Lin Hui Guo Wei-Hua Li School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Owing to their inherent semi-solid property and lubricant ability,organogels manifest various unique characteristics and serve as promising candidates for ***,the poor mechanical properties of organogels often limit their practical ***,we report a simple and effective method to prepare organogels with reinforced mechanical performance and surface lubricant ability with the synergistic roles played by oleophobic and oleophilic *** rigid oleophobic chains have a poor affinity to lubricating solvent,which gives rise to high oleophobic interactions between polymer networks;the soft oleophilic chains possess a high affinity to the low surface energy solvent,which lead to high solvent content to maintain the satisfactory lubricant *** organogel of oleophobic methyl methacrylate(MMA)and oleophilic lauryl methacrylate(LMA)is chosen as a representative example to illustrate this *** the optimal composition,the as-prepared organogels offer satisfactory tensile fracture stress,fracture strain,Young’s modulus,toughness,and tearing fracture energy of 480 k Pa,550%,202 k Pa,1.14 MJ m,and 5.14 k J m,respectively,which are far beyond the classical PLMA ***,the biofouling resistance tests demonstrate 4 to 9-fold reduction of protein and bacteria adhesion on the reinforced organogels surface in comparison to the glass substrate and solvent-free dry *** simple and effective approach to toughen organogels,we hope,can be applied in various fields with different practical functional requirements in the future.

关键词： Organogels Mechanical reinforcement Fouling-resistance slippery surface

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