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Tang Z, Xu B, Man X, Liu H. Bioinspired Superhydrophobic Fibrous Materials. SMALL METHODS 2024; 8:e2300270. [PMID: 37312429 DOI: 10.1002/smtd.202300270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/27/2023] [Indexed: 06/15/2023]
Abstract
Natural fibers with robust water repellency play an important role in adapting organisms to various environments, which has inspired the development of artificial superhydrophobic fibrous materials with applications in self-cleaning, antifogging, water harvesting, heat exchanging, catalytic reactions, and microrobots. However, these highly textured surfaces (micro/nanotextured) suffer from frequent liquid penetration in high humidity and abrasion-induced destruction of the local environment. Herein, bioinspired superhydrophobic fibrous materials are reviewed from the perspective of the dimension scale of fibers. First, the fibrous dimension characteristics of several representative natural superhydrophobic fibrous systems are summarized, along with the mechanisms involved. Then, artificial superhydrophobic fibers are summarized, along with their various applications. Nanometer-scale fibers enable superhydrophobicity by minimizing the liquid-solid contact area. Micrometer-scale fibers are advantageous for enhancing the mechanical stability of superhydrophobicity. Micrometer-scale conical fibrous structures endow a Laplace force with a particular magnitude for self-removing condensed tiny dewdrops in highly humid air and stably trapping large air pockets underwater. Furthermore, several representative surface modification strategies for constructing superhydrophobic fibers are presented. In addition, several conventional applications of superhydrophobic systems are presented. It is anticipated that the review will inspire the design and fabrication of superhydrophobic fibrous systems.
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Affiliation(s)
- Zhongxue Tang
- School of Physics, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, P. R. China
| | - Bojie Xu
- Research Institute for Frontier Science, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, P. R. China
| | - Xingkun Man
- School of Physics, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, P. R. China
| | - Huan Liu
- Research Institute for Frontier Science, Beihang University, No. 37, Xueyuan Road, Haidian District, Beijing, 100191, P. R. China
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Li M, Guo Q, Wen J, Zhan F, Shi M, Zhou N, Huang C, Wang L, Mao H. Oriented bouncing of droplets with a small Weber number on inclined one-dimensional nanoforests. NANOSCALE 2024; 16:5343-5351. [PMID: 38375552 DOI: 10.1039/d3nr05449g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
Asymmetric superhydrophobic structures with anisotropic wettability can achieve directional bouncing of droplets and thus can have applications in directional self-cleaning, liquid transportation, and heat transfer. To achieve convenient large-scale preparation of asymmetric superhydrophobic surfaces, inclined nanoforests are prepared in this work using a technique of competitive ablation polymerization, which allows the control of the inclined angles, diameters, and heights of the nanostructures. In this study, such asymmetric structures with the smallest dimension (230 nm diameter) known are achieved by a simple etching method to guide droplet unidirectional bouncing. With such nanoforests, the mechanism of droplet bouncing on their surface is investigated, and controllable droplet bouncing over a long distance is achieved using droplets with a low Weber number. The proposed structure has a promising future in directional self-cleaning, liquid transportation and heat transfer.
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Affiliation(s)
- Mao Li
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Qiming Guo
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jing Wen
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fei Zhan
- Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083, China.
| | - Meng Shi
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Na Zhou
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Chengjun Huang
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Lei Wang
- Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing, 100083, China.
| | - Haiyang Mao
- Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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Liu G, Yang J, Zhang K, Wu H, Yan H, Yan Y, Zheng Y, Zhang Q, Chen D, Zhang L, Zhao Z, Zhang P, Yang G, Chen H. Recent progress on the development of bioinspired surfaces with high aspect ratio microarray structures: From fabrication to applications. J Control Release 2024; 367:441-469. [PMID: 38295991 DOI: 10.1016/j.jconrel.2024.01.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/12/2024] [Accepted: 01/25/2024] [Indexed: 02/05/2024]
Abstract
Surfaces with high aspect ratio microarray structures can implement sophisticated assignment in typical fields including microfluidics, sensor, biomedicine, et al. via regulating their deformation or the material properties. Inspired by natural materials and systems, for example sea cockroaches, water spiders, cacti, lotus leaves, rice leaves, and cedar leaves, many researchers have focused on microneedle functional surface studies. When the surface with high aspect ratio microarray structures is stimulated by the external fields, such as optical, electric, thermal, magnetic, the high aspect ratio microarray structures can undergo hydrophilic and hydrophobic switching or shape change, which may be gifted the surfaces with the ability to perform complex task, including directional liquid/air transport, targeted drug delivery, microfluidic chip sensing. In this review, the fabrication principles of various surfaces with high aspect ratio microarray structures are classified and summarized. Mechanisms of liquid manipulation on hydrophilic/hydrophobic surfaces with high aspect ratio microarray structures are clarified based on Wenzel model, Cassie model, Laplace pressure theories and so on. Then the intelligent control strategies have been demonstrated. The applications in microfluidic, drug delivery, patch sensors have been discussed. Finally, current challenges and new insights of future prospects for dynamic manipulation of liquid/air based on biomimetic surface with high aspect ratio microarray structures are also addressed.
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Affiliation(s)
- Guang Liu
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Jiajun Yang
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Kaiteng Zhang
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China
| | - Hongting Wu
- Zhongtong Bus Holding Co., Ltd, Liaocheng, Shandong, China
| | - Haipeng Yan
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Yu Yan
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Yingdong Zheng
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Qingxu Zhang
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China
| | - Dengke Chen
- College of Transportation, Ludong University, Yantai, Shandong, China
| | - Liwen Zhang
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China
| | - Zehui Zhao
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China
| | - Pengfei Zhang
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China
| | - Guang Yang
- School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, China.
| | - Huawei Chen
- School of Mechanical Engineering and Automation, Beihang University, Beijing, China.
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Yada S, Lacis U, van der Wijngaart W, Lundell F, Amberg G, Bagheri S. Droplet Impact on Asymmetric Hydrophobic Microstructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7956-7964. [PMID: 35737474 PMCID: PMC9261186 DOI: 10.1021/acs.langmuir.2c00561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/09/2022] [Indexed: 06/15/2023]
Abstract
Textured hydrophobic surfaces that repel liquid droplets unidirectionally are found in nature such as butterfly wings and ryegrass leaves and are also essential in technological processes such as self-cleaning and anti-icing. In many occasions, surface textures are oriented to direct rebounding droplets. Surface macrostructures (>100 μm) have often been explored to induce directional rebound. However, the influence of impact speed and detailed surface geometry on rebound is vaguely understood, particularly for small microstructures. Here, we study, using a high-speed camera, droplet impact on surfaces with inclined micropillars. We observed directional rebound at high impact speeds on surfaces with dense arrays of pillars. We attribute this asymmetry to the difference in wetting behavior of the structure sidewalls, causing slower retraction of the contact line in the direction against the inclination compared to with the inclination. The experimental observations are complemented with numerical simulations to elucidate the detailed movement of the drops over the pillars. These insights improve our understanding of droplet impact on hydrophobic microstructures and may be useful for designing structured surfaces for controlling droplet mobility.
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Affiliation(s)
- Susumu Yada
- FLOW
Centre, Department of Engineering Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
| | - Ugis Lacis
- FLOW
Centre, Department of Engineering Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
| | - Wouter van der Wijngaart
- Division
of Micro and Nanosystems, Royal Institute
of Technology (KTH), 100 44 Stockholm, Sweden
| | - Fredrik Lundell
- FLOW
Centre, Department of Engineering Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
| | - Gustav Amberg
- FLOW
Centre, Department of Engineering Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
- Södertörn
University, 141 89 Stockholm, Sweden
| | - Shervin Bagheri
- FLOW
Centre, Department of Engineering Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
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Ji T, Pan Y, Shao Y, He B, Wen B. Lateral Drop Rebound on a Hydrophobic and Chemically Heterogeneous Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6905-6914. [PMID: 34060835 DOI: 10.1021/acs.langmuir.1c00242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this paper, the process of a drop rebounding from a hydrophobic and chemically heterogeneous surface is investigated using the multiphase lattice Boltzmann method. The bounce behavior of drops is dependent on the degree of hydrophobicity and heterogeneity of the surface. When the surface is homogeneous, the drop rebounds vertically and the height increases with the enhancement of the surface hydrophobicity. For the heterogeneous surface with two different hydrophobic parts, the drop rebounds laterally toward the lower hydrophobic side. Because the high hydrophobic side exerts the stronger unbalanced Young's force on the contact line compared with the low hydrophobic side, the difference of the forces results in the asymmetrical rebound. A phase diagram displays the rebound numbers of a drop impacting on the various chemically homogeneous and heterogeneous surfaces. A simply quantitative estimation is made to predict the rebound heights and flying times through the contact angles of the surface. This work promotes the understanding of the rebound mechanism of a drop impacting on a chemically heterogeneous surface and provides a guiding strategy for the precise control of the lateral behavior of rebounding drops by hydrophobic and heterogeneous surfaces.
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Affiliation(s)
- Tingting Ji
- Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China
- College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, China
| | - Yongcai Pan
- Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China
- College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, China
| | - Yufu Shao
- Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China
- College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, China
| | - Bing He
- Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China
- College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, China
| | - Binghai Wen
- Guangxi Key Lab of Multi-Source Information Mining & Security, Guangxi Normal University, Guilin 541004, China
- College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, China
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Li C, Li M, Ni Z, Guan Q, Blackman BRK, Saiz E. Stimuli-responsive surfaces for switchable wettability and adhesion. J R Soc Interface 2021; 18:20210162. [PMID: 34129792 PMCID: PMC8205534 DOI: 10.1098/rsif.2021.0162] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 05/24/2021] [Indexed: 01/02/2023] Open
Abstract
Diverse unique surfaces exist in nature, e.g. lotus leaf, rose petal and rice leaf. They show similar contact angles but different adhesion properties. According to the different wettability and adhesion characteristics, this review reclassifies different contact states of droplets on surfaces. Inspired by the biological surfaces, smart artificial surfaces have been developed which respond to external stimuli and consequently switch between different states. Responsive surfaces driven by various stimuli, e.g. stretching, magnetic, photo, electric, temperature, humidity and pH, are discussed. Studies reporting on either atmospheric or underwater environments are discussed. The application of tailoring surface wettability and adhesion includes microfluidics/droplet manipulation, liquid transport and harvesting, water energy harvesting and flexible smart devices. Particular attention is placed on the horizontal comparison of smart surfaces with the same stimuli. Finally, the current challenges and future prospects in this field are also identified.
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Affiliation(s)
- Chang Li
- Department of Mechanical Engineering, City and Guilds Building, Imperial College London, London SW7 2AZ, UK
| | - Ming Li
- Centre of Advanced Structural Ceramics, Department of Materials, Imperial College London, London SW7 2AZ, UK
| | - Zhongshi Ni
- Department of Electrical and Computer Engineering, University of Massachusetts Amherst, Amherst, MA 01002, USA
| | - Qingwen Guan
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK
| | - Bamber R. K. Blackman
- Department of Mechanical Engineering, City and Guilds Building, Imperial College London, London SW7 2AZ, UK
| | - Eduardo Saiz
- Centre of Advanced Structural Ceramics, Department of Materials, Imperial College London, London SW7 2AZ, UK
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Zhu P, Chen C, Nandakumar K, Wang L. Nonspecular Reflection of Droplets. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2006695. [PMID: 33345437 DOI: 10.1002/smll.202006695] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Indexed: 06/12/2023]
Abstract
The bouncing of droplets on super-repellent surfaces normally resembles specular reflection that obeys the law of reflection. Here, the nonspecular reflection of droplet impingement onto solid surfaces with a dimple for energy-efficient, omnidirectional droplet transport is reported. With the dimple of the radius being comparable to that of the droplet, all the symmetries in the law of reflection can be broken down so that the droplet is endowed with a translational velocity finely tunable in both its direction and magnitude simply by varying the radii of the droplet and the dimple, the impinging position, and droplet Weber number. Tailoring the initial and translational velocity of impinging droplets would steer their reflected trajectories at will, thus enabling versatile droplet manipulation including trapping, shedding, antigravity transport, targeted positioning, and on-demand coalescence of droplets.
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Affiliation(s)
- Pingan Zhu
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
- HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI), Hangzhou, Zhejiang, 311300, China
| | - Chengmin Chen
- Energy Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250014, China
- School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, 250014, China
| | - Krishnaswamy Nandakumar
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Liqiu Wang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
- HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI), Hangzhou, Zhejiang, 311300, China
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Lu Y, Shen Y, Tao J, Wu Z, Chen H, Jia Z, Xu Y, Xie X. Droplet Directional Movement on the Homogeneously Structured Superhydrophobic Surface with the Gradient Non-Wettability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:880-888. [PMID: 31939676 DOI: 10.1021/acs.langmuir.9b03411] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The surface with the gradient non-wettability intensely appeals to researchers because of its academic significance and applications for directional droplet movement. Herein, we developed a homogeneous structure superhydrophobic surface with the gradient non-wettability by a combination strategy of chemical etching and vapor diffusion modification. As a consequence, the as-prepared surface exhibits a remarkable gradient characteristic of water repellency, and the water contact angle is mainly located within the range of 162 ± 0.5 to 149 ± 0.4°. Meanwhile, the sliding angle also exhibits a corresponding change from 3 to 11°. On this basis, the gradient characteristic of non-wettability induces the distinguishing droplet adhesion on the surface, that is, from 19 μN for the most hydrophobic end to 57 μN for the opposite one. Because of the difference of the water adhesion force, droplets on the as-prepared surface can well roll alongside a specific direction (i.e., gradient direction of non-wettability). In terms of dynamic impact droplets, they can rapidly rebound off the sample surface with the short contact time of 12.8 ms, and the finally fallen droplets mainly deviate toward weaker regions because of water repellency. To analyze this phenomenon, it is found that the asymmetric mechanic behavior is mainly caused by the unbalanced retraction force between the both ends of the impact droplet. This work provides a novel strategy to construct the homogeneous structure superhydrophobic surface with the gradient non-wettability for the applications in the droplet movement control or transport.
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Affiliation(s)
- Yang Lu
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
| | - Yizhou Shen
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
| | - Jie Tao
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
- Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites , 30# Puzhu South Rd. , Nanjing 210009 , P. R. China
| | - Zhengwei Wu
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
| | - Haifeng Chen
- Department of Materials Chemistry , Qiuzhen School, Huzhou University , 759# East 2nd Road , Huzhou 313000 , P. R. China
| | - Zhenfeng Jia
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
| | - Yangjiangshan Xu
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
| | - Xinyu Xie
- College of Materials Science and Technology , Nanjing University of Aeronautics and Astronautics , 29# Yudao Street , Nanjing 210016 , P. R. China
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Tuo Y, Zhang H, Rong W, Jiang S, Chen W, Liu X. Drag Reduction of Anisotropic Superhydrophobic Surfaces Prepared by Laser Etching. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11016-11022. [PMID: 31364849 DOI: 10.1021/acs.langmuir.9b01040] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this research, the anisotropic superhydrophobic surface is prepared on a stainless steel surface by laser etching, and the drag reduction property of the anisotropic surface is studied by a self-designed solid-liquid interface friction test device. Periodic arrangement structures of quadrate scales with oblique grooves are obtained on a stainless steel surface by a laser. After modification by fluoride, the surface shows superhydrophobicity and anisotropic adhesive property. Here, the inclined direction of grooves and the inverse direction are defined as RO and OR, respectively. By changing the inclination of the grooves, a surface is obtained with a contact angle of 160° and a rolling angle difference of 6° along the RO and inverse RO direction. It is verified by numerical simulation and experiment that the subjected force of water droplets on the surface is different along the RO and inverse RO direction. Furthermore, the as-prepared surface has different drag reduction effects along the two directions. With the increase of velocity, the drag reduction effect of the superhydrophobic surface decreases against the RO direction, while the drag reduction effect along the RO direction is almost unchanged. We believe the anisotropic surface will be helpful in novel microfluid devices and shipping transportation.
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Affiliation(s)
| | - Haifeng Zhang
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing , Ministry of Education , Harbin 150001 , China
| | | | | | - Weiping Chen
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing , Ministry of Education , Harbin 150001 , China
| | - Xiaowei Liu
- Key Laboratory of Micro-Systems and Micro-Structures Manufacturing , Ministry of Education , Harbin 150001 , China
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Lee SH, Seong M, Kwak MK, Ko H, Kang M, Park HW, Kang SM, Jeong HE. Tunable Multimodal Drop Bouncing Dynamics and Anti-Icing Performance of a Magnetically Responsive Hair Array. ACS NANO 2018; 12:10693-10702. [PMID: 30248255 DOI: 10.1021/acsnano.8b05109] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Anti-icing materials that can efficiently limit ice formation have a strong potential to replace existing anti-icing techniques, such as Joule heating, chemical release, or mechanical removal, which are usually inefficient, expensive, and environmentally harmful. In this study, an anti-icing material based on a magnetically responsive hierarchical hair array that can actively modulate drop bouncing dynamics is presented. The magnetically responsive hair array exhibits an immediate and reversible structural bending motion in response to an external magnetic field. The array also exhibits superhydrophobicity, regardless of its tilt angle, due to the tapered geometry of the hairs and the multiscale surface roughness of the array. Due to its dynamic structure and water-repellent characteristics, the array can induce distinct multiple modes of drop bouncing behavior by adjusting its structural bending state in a reversible fashion. Three different types of bouncing behavior, namely, quasi-pancake bouncing, directional bouncing, and macrotexture-induced droplet fragmentation, can be obtained with the vertical, tilted, and fully bent hair arrays, respectively. We demonstrate that the dynamically controllable drop bouncing behavior of the magnetically responsive hierarchical array enables the efficient and robust prevention of ice formation and accumulation.
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Affiliation(s)
- Sang-Hyeon Lee
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
| | - Minho Seong
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
| | - Moon Kyu Kwak
- Department of Mechanical Engineering , Kyungpook National University , Daegu , Republic of Korea 41566
| | - Hyunwook Ko
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
| | - Minsu Kang
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
| | - Hyung Wook Park
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
| | - Seong Min Kang
- Department of Mechanical Engineering , Chungnam National University , Daejeon , Republic of Korea 34134
| | - Hoon Eui Jeong
- Department of Mechanical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Republic of Korea 44919
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Li P, Zhang B, Zhao H, Zhang L, Wang Z, Xu X, Fu T, Wang X, Hou Y, Fan Y, Wang L. Unidirectional Droplet Transport on the Biofabricated Butterfly Wing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12482-12487. [PMID: 30230848 DOI: 10.1021/acs.langmuir.8b02550] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Water droplet unidirectional transport on the asymmetric superhydrophobic surface has attracted much interest in theory analysis and applications, such as self-cleaning, antifogging, anti-icing, heat transfer, and so on. Different from the symmetrical performance on the uniform topographies, the droplets acting on the asymmetric surface exhibit an anisotropic state and easily roll off the surface along the special direction. This phenomenon is indicated by natural butterfly wings. The flexible asymmetrically arranged microstep induces the droplet to release along the outside radial (RO) direction and to pin against the RO direction. Here, inspired by butterfly wings, a kind of surface for superhydrophobic and unidirectional droplet transport is achieved by integrating the methods of soft lithography and enhanced crystal growth. The water droplet shows the anisotropic state on the biofabricated surface, and it rolls off easily along the step direction. The droplet is unidirectionally driven off the surface by the asymmetric surface tension force generated by the microstep topography. This experiment is significant for designing self-cleaning surfaces.
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Affiliation(s)
- Peiliu Li
- Biomechanics and Biomaterials Laboratory, Department of Applied Mechanics, School of Aerospace Engineering , Beijing Institute of Technology , Beijing 100081 , PR China
| | - Bo Zhang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Hongbin Zhao
- State Key Laboratory of Advanced Materials for Smart Sensing , General Research Institute for Nonferrous Metals , Beijing 100088 , China
| | - Lunjia Zhang
- State Key Laboratory of Advanced Materials for Smart Sensing , General Research Institute for Nonferrous Metals , Beijing 100088 , China
| | - Zhe Wang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Xiangyu Xu
- Biomechanics and Biomaterials Laboratory, Department of Applied Mechanics, School of Aerospace Engineering , Beijing Institute of Technology , Beijing 100081 , PR China
| | - Tingting Fu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Xiaonan Wang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Yongping Hou
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Yuzun Fan
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , Beijing 100191 , China
| | - Lei Wang
- State Key Laboratory of Advanced Materials for Smart Sensing , General Research Institute for Nonferrous Metals , Beijing 100088 , China
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