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Recent progress in bio-inspired macrostructure array materials with special wettability—from surface engineering to functional applications

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International Journal of Extreme Manufacturing 2024年第1期6卷 208-256页

作者： Zhongxu Lian Jianhui Zhou Wanfei Ren Faze Chen Jinkai Xu yanling tian Huadong Yu School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130022People’s Republic of China Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022People’s Republic of China College of Mechanical and Electrical Engineering Changchun University of Science and TechnologyChangchun 130022People’s Republic of China School of Mechanical Engineering Tianjin UniversityTianjin 300350People’s Republic of China School of Engineering University of WarwickCoventry CV47ALUnited Kingdom

Bio-inspired macrostructure array(MAA,size:submillimeter to millimeter scale)materials with special wettability(MAAMs-SW)have attracted significant research attention due to their outstanding performance in many applications,including oil repellency,liquid/droplet manipulation,anti-icing,heat transfer,water collection,and oil–water separation.In this review,we focus on recent developments in the theory,design,fabrication,and application of bio-inspired MAAMs-SW.We first review the history of the basic theory of special wettability and discuss representative structures and corresponding functions of some biological surfaces,thus setting the stage for the design and fabrication of bio-inspired MAAMs-SW.We then summarize the fabrication methods of special wetting MAAs in terms of three categories:additive manufacturing,subtractive manufacturing,and formative manufacturing,as well as their diverse functional applications,providing insights into the development of these MAAMs-SW.Finally,the challenges and directions of future research on bio-inspired MAAMs-SW are briefy addressed.Worldwide efforts,progress,and breakthroughs from surface engineering to functional applications elaborated herein will promote the practical application of bio-inspired MAAMs-SW.

关键词： macrostructure arrays superhydrophobic 3D printing laser droplet manipulation

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Stability Mechanism of Laser-induced Fluorinated Super-hydrophobic Coating in Alkaline Solution

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Journal of Bionic Engineering 2022年第1期19卷 113-125页

作者： Haoyang Li yanling tian Zhen Yang School of Mechanical Engineering Tianjin UniversityTianjin300350China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyHong Kong999077China

Great attention has been focused on super-hydrophobic surfaces due to their fantastic applications.Fluoride chemicals are widely used to fabricate super-hydrophobic surfaces due to their convenience,simplicity,and high efficiency.Previous research has made extensively efforts on corrosion resistance of fluorinated super-hydrophobic surfaces in corrosive media.Nevertheless,rare papers focused on the underlying reasons of anticorrosion property and stability mechanism on the fluorinated super-hydrophobic coatings in alkaline solution.Therefore,this work aims to reveal these mechanisms of fluorinated super-hydrophobic copper samples in strong alkaline solution(pH 13).Through the characterization of surface wettability and surface morphology,the laser-induced super-hydrophobic surface retained excellent stability after soaking in alkaline solution for 4 h.Through measurement of chemical compositions,the anticorrosion mechanism and stability mechanism of the fluorinated super-hydrophobic surface were proposed.Importantly,the hydroxyl ion(OH−)can further promote the hydrolysis reaction to improve the density and bonding strength of the fluoride molecules.Finally,the electrochemical experiments(PDP and EIS tests)were conducted to validate the rationality of our proposed conclusions.

关键词： Fluoride Laser Super-hydrophobicity Alkaline corrosion Stability mechanism

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Semi-analytical Stiffness Model of Bolted Joints in Machine Tools Considering the Coupling Effect

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Nanomanufacturing and Metrology 2023年第2期6卷 66-78页

作者： Yiwei Ma Yutao Fu yanling tian Xianping Liu School of Engineering The University of WarwickCoventry CV47ALUK School of Mechanical Engineering Tianjin UniversityTianjin 300072China

This study proposes an improved semi-analytical approach for contact stiffness modeling of bolted joints in a machine tool system.First,nonlinear contact stress distribution within a single-bolted joint is obtained from the simulation results of finite element analysis software.Second,employing the Hertz contact theory and fractal theory,the contact stiffness model of a single asperity is formulated,affording analytical expressions for normal and tangential contact stiffnesses of a single-bolted joint by integrating multi-asperities in the contact area.Subsequently,considering two test specimens as illustrations,the mode shapes and natural frequencies of the proposed model and modal analysis tests are compared,and the influence of coupling effects between two adjacent bolts is illustrated.The maximum error in the natural frequencies of the proposed approach is<2.73%relative to the experimental results.Finally,the measurements of frequency response functions on a box-in-box precision horizontal machine tool are conducted to demonstrate the accuracy and efficiency of the proposed model.The proposed model is highly efficient in revealing the influence of microcontact factors on the contact stiffness of bolted joints and in guiding the optimal functional design of bolt arrangements under the framework of virtual machine tools.

关键词： Stiffness modeling Bolted joint Microcontact mechanics Fractal theory Rough surface

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Laser Ablation and Chemical Oxidation Synergistically Induced Micro/Nano Re-entrant Structures for Super-Oleophobic Surface with Cassie State

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Nanomanufacturing and Metrology 2023年第2期6卷 79-89页

作者： Jiaqi Chao Faze Chen Lei Xia Zexin Cai Fujun Wang yanling tian Dawei Zhang School of Mechanical Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300072China School of Engineering University of WarwickCoventry CV47DLUK

Generally,re-entrant structures are a key part of fabricating superoleophobic surfaces,and this structure appears in almost all kinds of published research articles regarding superoleophobicity.However,the application of related fabrication methods is usually too complex and costly in real practice.In this paper,we present a simple method to generate micro-cauliflower structures,which work as re-entrant structures in microcone arrays,to promote the formation of superoleophobic surfaces.The heating process after alkali-assisted surface oxidation is the main reason for the appearance of a micro-ball structure,and the oxidation time can influence the size of the micro-ball.To the best of our knowledge,the influence of the heating process after alkali-assisted surface oxidation on the birth of the micro-ball structure is seldom researched.A low-surface-energy treatment was also analyzed in influencing the size of the re-entrant structure and its relative wettability.Droplets of 5μl of n-decane show contact angles of 155±1°on the as-prepared superoleophobic surface,and air pockets can be clearly seen underneath,indicating a stable Cassie contacting state and a promising application value in the near future.

关键词： Superoleophobic Re-entrant structure Cassie state Laser direct writing

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Hybrid Laser Ablation and Chemical Modification for Fast Fabrication of Bio-inspired Super-hydrophobic Surface with Excellent Self-cleaning,Stability and Corrosion Resistance

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Journal of Bionic Engineering 2019年第1期16卷 13-26页

作者： Zhen Yang Xianping Liu yanling tian Key Laboratory of Mechanism Theory and Equipment Design Ministry of EducationTianjin UniversityTianjin 300350China School of Engineering University of WarwickCoventry CV4 7ALUK

Although laser ablation is considered as a facile technique to fabricate bio-inspired super-hydrophobic surfaces,the issue is that the initial laser treated metallic surfaces show super-hydrophilic property.It will take a long period to reach super-hydrophobic state under ambient air.It is reported that these super-hydrophobic surfaces could be easily damaged by thermal heating effect or interaction with other liquids,causing uncontrolled loss of super-hydrophobicity.In this study,a stable super-hydrophobic aluminum surface was rapidly fab-ricated via the hybrid laser ablation and surface chemical modification of(heptadecafluoro-1,1,2,2-tetradecyl)triethoxysilane(AC-FAS).Surface morphology and chemistry were systematically investigated to explore the generation mechanism of super-hydrophobicity.The water contact angle of the treated surfaces can reach up to 160.6°±1.5°with rolling angle of 3.0°±1.0°,exhibiting perfect self-cleaning capability,long-term stability,and excellent chemical stability in acidic as well as alkaline solutions.The potentiodynamic polarization tests implied that the super-hydrophobic surfaces showed better anti-corrosion performance.This hybrid laser ablation and surface chemical modification are very time-saving and low-cost,which offers a rapid way for quantity production of super-hydrophobic surface on aluminum material.

关键词： bioinspiration nanosecond laser super-hydrophobic chemical stability corrosion resistance self-cleaning long-term stability

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The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification

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Journal of Bionic Engineering 2021年第1期18卷 77-91页

作者： Chengjuan Yang weiran Cao Zhen Yang Meng Wang Xiubing Jing yanling tian School of Mechanical Engineering Tianjin UniversityTianjin 300054China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin 300072China School of Engineering University of WarwickCoventry CV47ALUK

This paper presents a new and safe method of fabricating super-hydrophobic surface on NiTi Shape Memory Alloy(SMA),which aims to further improve the corrosion resistance performance and biocompatibility of NiTi SMA.The super-hydrophobic surfaces with Water Contact Angle(WCA)of 155.4°±0.9°and Water Sliding Angle(WSA)of 4.4°±1.1°were obtained by the hybrid of laser irradiation and polydimethylsiloxane(PDMS)modification.The forming mechanism was systematically revealed via Scanming Electron Microscopy(SEM)and X-ray Photoelectron Spectroscopy(XPS).The ant-corrosion of samples was investigated in Simulated Body Fluid(SBF)via the potentiodynamie polarization(PDP)and Electrochemical Impedance Spectroscopy(EIS)tests.PDMS super-hydrophobic coatings showed superior anti-corrosion performance.The Ni ions release experiment was also conducted and the corresponding result demonstrated that the super-hydrophobic samplcs effectively inhibited the rclease of Ni ions both in clctrolyte and SBF Besides,biocompaibility was further analyzed,indicating that the prepared super-hydrophobic surfaces present a huge potential advantage in biocompatibility.

关键词： wettability lascr tcxturing corrosion resistance mechanism human body liquid Ni ions release

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Dodecyl Mercaptan Functionalized Copper Mesh for Water Repellence and Oil-water Separation

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Journal of Bionic Engineering 2021年第4期18卷 887-899页

作者： yanling tian Jiekai Feng Zexin Cai Jiaqi Chao Dawei Zhang Yuxiao Cui Faze Chen School of Mechanical Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300072China School of Engineering University of WarwickCoventry CV47DLUK School of Mechanical Engineering Tianjin University of Technology and EducationTianjin 300222China

Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival.Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation.However,further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment.Herein,we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh(SSCM).The prepared SSCM possesses excellent water repellence and oil affinity,enabling it to successfully separate various oil-water mixtures with high separation efficiency(e.g.,>99%for hexadecane-water mixture).The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures,indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh.Additionally,the efficiency can be well maintained during 50 cycles of separation,and the water repellence is even stable after storage in air for 120 days,demonstrating the reusability and long-term stability of the SSCM.Furthermore,the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper,and oil-water separation efficiency of>96%can be obtained after 10 cycles of abrasion.The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh,and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.

关键词： copper mesh superhydrophobic oil-water separation stability reusability

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一类带传染病的捕食与被捕食模型的动力学分析

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应用数学 2024年第3期37卷 805-824页

作者：饶佳威宋兴传田艳玲华南师范大学数学科学学院广东广州510631

本文研究一种带人为捕获率的食饵患病的捕食与被捕食模型.首先,通过将平衡点进行成对分析,得到各平衡点局部稳定性结论和一些阈值;其次,通过构造Liapunov函数得到捕食者无病平衡点、共存无病平衡点、食饵地方病平衡点和共存地方病平衡... 详细信息

本文研究一种带人为捕获率的食饵患病的捕食与被捕食模型.首先,通过将平衡点进行成对分析,得到各平衡点局部稳定性结论和一些阈值;其次,通过构造Liapunov函数得到捕食者无病平衡点、共存无病平衡点、食饵地方病平衡点和共存地方病平衡点的全局稳定性;最后,通过数值模拟验证了理论分析的结果,并讨论了疾病、捕食者以及对食饵的人为捕获率对系统的共同作用.

关键词：捕食-被捕食者模型食饵患病稳定性人为捕获率

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Erratum to: Stability Mechanism of Laser-induced Fluorinated Super-hydrophobic Coating in Alkaline Solution

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Journal of Bionic Engineering 2022年第1期19卷 278-278页

The article“Stability Mechanism of Laser-induced Fluorinated Super-hydrophobic Coating in Alkaline Solution”,written by Haoyang Li,yanling tian,Zhen Yang,was originally published electronically on the publisher’s internet portal on 26 November 2021 without open access.With the author(s)’decision to opt for Open Choice the copyright of the article changed on 29 of December 2021 to The Author(s)2021 and the article is forthwith distributed under a Creative Commons Attribution 4.0 International License,which permits use,sharing,adaptation,distribution and reproduction in any medium or format,as long as you give appropriate credit to the original author(s)and the source,provide a link to the Creative Commons licence,and indicate if changes were made.The images or other third party material in this article are included in the article’s Creative Commons licence,unless indicated otherwise in a credit line to the material.

关键词： otherwise Open distribution

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Dynamic modeling and analysis of the 3-PRS power head based on the screw theory and rigid multipoint constraints

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Science China(Technological Sciences) 2023年第7期66卷 1869-1882页

作者： MA YiWei tian yanling LIU XianPing LU ChengHao School of Engineering The University of WarwickCoventryCV47ALUK School of Mechanical Engineering Tianjin UniversityTianjin300072China

This study presents a dynamic modeling and analysis methodology for the 3-PRS parallel mechanism.First,an improved reduced dynamic model of component substructures is proposed using the dynamic condensation technique and the rigid multipoint constraints at the joint/interface level,leading to a minimum set of generalized coordinates for external nodes.Next,the mapping between interface constraint stiffness and global stiffness is illustrated,resulting in an analytical stiffness model of joint substructures.Subsequently,the derived component and joint substructures are synthesized into the entire mechanism based on the Lagrange equation.Finally,a case study illustrates that the lower-order dynamic performances predicted within the proposed approach have the same trend as those obtained from a complete-order finite element model.The root mean square discrepancy of the lower-order natural frequencies between the two models is less than 5.92%,indicating the accuracy and effectiveness of the proposed model.The developed approach can highly and efficiently predict the dynamic performance distributions across the entire workspace and guide the optimal functional design under the virtual machine framework.

关键词： dynamic modeling parallel kinematic machines screw theory substructure synthesis rigid multipoint constraints

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