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Novel Hollow Re-entrant Structures Improving Hydrophobicity of Metal Surfaces

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Nanomanufacturing and Metrology 2023年第2期6卷 27-36页

作者： Zhaoqiang Zou jinkai xu Wanfei Ren Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022China School of Mechanical and Electrical Engineering Changchun University of Science and TechnologyChangchun 130022China

Re-entrant structures have drawn increasing attention because of their ***,it is very difficult to manufacture re-entrant structures at the micron scale on metal *** this study,we designed and manufactured novel hollow re-entrant structures employing laser ablation and electrodeposition *** designed hollow re-entrant structure on metal surfaces has been fabricated successfully,which has high processing efficiency and good *** morphology and size of the hollow re-entrant structures were *** found that the hydrophobic performance of hollow re-entrant structures was improved after being in the atmosphere for 3 *** electrodeposition,the static contact angle was 133°.However,after being placed in the atmosphere for 3 days,the static contact angle was 140.4°,which is 5.2%higher than that after electrochemical *** explained the cause of this *** change of element content on the surface of hollow re-entrant structures was used to indicate the formation of metal *** being in the atmosphere for 3 days,oxygen content increased by 0.4%.The metal surfaces with hollow re-entrant structures have a broader application prospect.

关键词： Hollow re-entrant structures Electrodeposition Hydrophobic surface

Localized electrodeposition micro additive manufacturing of pure copper microstructures

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International Journal of Extreme Manufacturing 2022年第1期4卷 51-61页

作者： Wanfei Ren jinkai xu Zhongxu Lian Xiaoqing Sun Zhenming xu Huadong Yu Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022People’s Republic of China

The fabrication of pure copper microstructures with submicron resolution has found a host of applications,such as 5G communications and highly sensitive *** tiny and complex features of these structures can enhance device performance during high-frequency ***,manufacturing pure copper microstructures remain *** this paper,we present localized electrochemical deposition micro additive manufacturing(LECD-μAM).This method combines localized electrochemical deposition(LECD)and closed-loop control of atomic force servo technology,which can effectively print helical springs and hollow *** further demonstrate an overall model based on pulsed microfluidics from a hollow cantilever LECD process and closed-loop control of an atomic force *** printing state of the micro-helical springs can be assessed by simultaneously detecting the Z-axis displacement and the deflection of the atomic force probe *** results showed that it took 361 s to print a helical spring with a wire length of 320.11μm at a deposition rate of 0.887μm s^(-1),which can be changed on the fly by simply tuning the extrusion pressure and the applied ***,the in situ nanoindenter was used to measure the compressive mechanical properties of the helical *** shear modulus of the helical spring material was about 60.8 GPa,much higher than that of bulk copper(~44.2 GPa).Additionally,the microscopic morphology and chemical composition of the spring were *** results delineate a new way of fabricating terahertz transmitter components and micro-helical antennas with LECD-μAM technology.

关键词： rapid prototyping localized electrochemical deposition additive manufacturing mechanical properties micro-helical spring

Research Progress on Corrosion Resistance of Magnesium Alloys with Bio-inspired Water-repellent Properties:A Review

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Journal of Bionic Engineering 2021年第4期18卷 735-763页

作者： jinkai xu Qianqian Cai Zhongxu Lian Zhanjiang Yu Wanfei Ren Huadong Yu Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022China

Thanks to its excellent mechanical properties,magnesium alloys have many potential applications in the aerospace and other ***,failure to adequately solve corrosion problems of magnesium alloy becomes one of the factors restricting its wide use in many industrial *** by nature,researchers designed and fabricated bio-inspired water-repellent(superhydrophobic and slippery liquid-infused porous surface)surfaces with special wetting properties by exploring the surface microstructures of plants and animals such as lotus leaf and nepenthes pitcher,exhibiting excellent corrosion-resistant *** article summarizes the research progress on corrosion resistance of magnesium alloys with bio-inspired water-repellent properties in recent *** mainly introduces the corrosion reasons,types of corrosion of magnesium alloys,and the preparation of magnesium alloys with bio-inspired water-repellent properties to improve corrosion *** particular,it is widely used and effective to construct water-repellent and anti-corrosion coating on the surface of magnesium alloy by surface *** is hoped that the research in this review can broaden the application range of magnesium alloys and provide a powerful reference for the future research on corrosion resistance of magnesium alloys.

关键词： magnesium alloy bio-inspired water-repellent corrosion resistance superhydrophobic slippery liquid-infused porous surface research progress

Effect of Plastocene Embedment in the Microperforated Plate on Its AcousticPerformance

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Journal of Renewable Materials 2021年第5期9卷 923-941页

作者： Yipu Wang Yonghua Wang Zheming Liu Huadong Yu jinkai xu Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun130022China Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchun130025China

Noise pollution is one of the contemporary environmental pollution, which seriously damages people’s green andhealthy life. In order to further improve the low frequency sound absorption performance of microperforatedpanel (MPP), a new plastocene coupled microperforated plate (PCMPP) is proposed. The acoustic propertiesof PCMPP with different apertures and perforation ratio were measured by transfer function method and compared with that of conventional MPPs. It is found that when the aperture was 0.8 mm, the peak value of soundabsorption coefficient of PCMPP decreased by 150 Hz compared with MPP. In a certain range, PCMPP with larger apertures showed a greater influence on sound absorption property in low frequency. In addition, higher perforation ratio led to a greater PCMPP bandwidth of sound absorption. On the other hand, the effect of PCMPPwith aperture of 0.2 mm on the performance of MPP was reduced, which could be compensated by increasing theperforation ratio. Furthermore, we found that the effect of aperture, perforation ratio and cavity on the soundabsorption performance of PCMPP was consistent with that of ideal rigid MPP. The step cooling curve showedthat the plastocene began to soften at about 50℃, representing a great potential for a non-high temperaturework environment.

关键词： Noise pollution plastocene coupled microperforated panel transfer function method sound absorption coefficient

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 *** this review,we focus on recent developments in the theory,design,fabrication,and application of bio-inspired *** 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 *** 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 ***,the challenges and directions of future research on bio-inspired MAAMs-SW are briefy *** 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

Bioinspired materials for droplet manipulation:Principles,methods and applications

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Droplet 2022年第1期1卷 11-37页

作者： jinkai xu Siyu Xiu Zhongxu Lian Huadong Yu Jiaji Cao Department of Mechanical Design Manufacturing and AutomationMinistry of Education Key Laboratory for Cross‐Scale Micro and Nano ManufacturingChangchun University of Science and TechnologyChangchunChina Department of Mechanical Materials and Process EngineeringSchool of EngineeringUniversity of WarwickCoventryUK Department of Mechanical and Electronic Engineering School of Mechanical and Aerospace EngineeringJilin UniversityChangchunChina

Droplet manipulation techniques such as transport and merging have been widely used in many fields including biology,chemistry,material and energy ***,droplet manipulation strategies have been extensively investigated and reviewed in terms of droplet placement on solid ***,less attention has been paid to the practice of droplet manipulation technology in other environments,limiting our understanding and the broadening of technology *** this article,we provided an overview of the recent progress in controlling droplets in various situations,including droplet manipulation on a surface mediated by the passive strategy(Laplace pressure and wettability gradients)and active strategy(electric field,magnetic field,light and heat).We also presented the principle of droplet manipulation and detailed the application of bionic surfaces in droplet manipulation,and the applications and prospects of droplet manipulation technology were summarized.

关键词： summarized limiting manipulation

Analytical Solution for an Elastic Sphere Indenting a Layered Half-Space

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Journal of Harbin Institute of Technology(New Series) 2017年第4期24卷 83-89页

作者： Yiquan Li Xiaozhou Li jinkai xu Huadong Yu School of Mechatronical Engineering Changchun University of Science and Technology

The contact problem for the elastic sphere indenting a layered half-space is considered. Analytical methods for solving this problem have been developed on the basis of the 3-D fundamental solution of a half space with a single coating layer under a normal concentrated force on the surface. The normal pressure distribution within the contact zone is assumed as Hertzian type. The solutions are constructed using superposition principle in the form of infinite series. Through comparing with the numerical results of FEM,it can be verified that the exact solutions have a rapid convergence rate and the stresses and displacements are mainly determined by the first term,which is corresponding to the solution of homogeneous half-space under Hertzian loading. The contact radius can be predicted applying the method.

关键词： fundamental solution image method coated half space spherical indentation contact radius

Experimental study on inhibitory effect of bridgy duct of hepatic artery on apoptosis of liver and bile duct cells

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Journal of Nanjing Medical University 2006年第4期20卷 204-208页

作者： Hongwei Lu Yiming Li Hong Ji jinkai xu Depaxtment of General Surgery the Second Hospital Xi ＇an Jiaotong University Xi ＇an 710004 China

Objective： To investigate whether the method of bridgy duct established between the recipient＇s spleen artery and the donor＇s gastroduodenal artery could inhibit the apoptosis of liver and bile duct cells caused by hepatic artery ischemia. Methods： Twenty-four mongrel dogs from Xi＇an area were used to establish simplified models of dog orthotopic liver transplantation and divided into three groups randomly： HAI group （hepatic artery ischemia group）,BBB group（bypassing the blood by a bridgy duct） and control group. After cold perfusion, The samples were collected from liver and bile duct in each group at different time and fixed in glutaraldehyde and 4% polyformaldehyde respectively. At last, the apoptosis of liver and bile duct cells were observed and the apoptotic indexes were calculated. Results： Two hours after cold perfusion, apoptotic phenomenon was common in HAI group, rare in BBB group, while no apoptotic phenomenon was observed in control group. TUNEL staining showed that there was no significant difference in apoptotic index among the three groups immediately after cold perfusion. However, with time going, the apoptotic cells were increased in three groups, and the difference in apoptotic index was significant among three groups （P 〈 0.01 ）. Conclusions： Bridgy duct of hepatic artery can inhibit the apoptosis of liver and bile duct cells caused by HAI significantly.

关键词： bridgy duct hepatic artery ischemia bypass apoptosis

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结构化砂轮磨削蓝宝石微沟槽底面质量的研究

湖南大学学报（自然科学版） 2024年第4期51卷 20-26页

作者：周飞许金凯张文通于化东长春理工大学机电工程学院吉林长春130022 长春理工大学跨尺度微纳制造教育部重点实验室吉林长春130022 吉林大学机械与航空航天工程学院吉林长春130025

针对蓝宝石这类超硬材料表面微结构难加工的问题,提出一种基于结构化砂轮的磨削表面微结构方法.采用电火花线切割(Wire Electrical Discharge Machining,WEDM)技术对砂轮表面进行结构化修整,利用修整后的结构化砂轮磨削蓝宝石表面微结构... 详细信息

针对蓝宝石这类超硬材料表面微结构难加工的问题,提出一种基于结构化砂轮的磨削表面微结构方法.采用电火花线切割(Wire Electrical Discharge Machining,WEDM)技术对砂轮表面进行结构化修整,利用修整后的结构化砂轮磨削蓝宝石表面微结构,研究顺磨和逆磨方式下,结构化砂轮磨削速度、磨削深度和进给速度对蓝宝石微沟槽底部表面粗糙度的影响规律.研究结果表明,结构化砂轮磨削蓝宝石表面微沟槽形貌基本完整,且相对120µm的加工深度,尺寸误差仅为1.4µm,微沟槽的垂直度较好,垂直度偏差仅为4.9°;顺、逆磨方式下,随着磨削速度增大,磨削深度和进给速度减小,都可以减小蓝宝石微沟槽底部表面粗糙度;相较于逆磨方式,顺磨方式下微沟槽底面微坑较小,底面质量更优;在较优加工参数砂轮磨削速度35m/s、磨削深度1µm、工件进给速度200mm/min下,表面粗糙度从4.487µm降低至2.923µm.

关键词：蓝宝石磨削表面粗糙度结构化砂轮磨削方式微沟槽