51
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Li H, Fang W, Zhao Z, Li A, Li Z, Li M, Li Q, Feng X, Song Y. Droplet Precise Self‐Splitting on Patterned Adhesive Surfaces for Simultaneous Multidetection. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Huizeng Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Wei Fang
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Zhipeng Zhao
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - An Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zheng Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Mingzhu Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Qunyang Li
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Xiqiao Feng
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Yanlin Song
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
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52
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Chu F, Luo J, Hao C, Zhang J, Wu X, Wen D. Directional Transportation of Impacting Droplets on Wettability-Controlled Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5855-5862. [PMID: 32390439 DOI: 10.1021/acs.langmuir.0c00601] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Although a superhydrophobic surface could realize rapid rebounding (i.e., short contact time) of an orthogonal impacting droplet, the rebounding along the original impacting route may limit its engineering application; in contrast, the directional transportation seems to be more promising. Here, we achieve directional transportation of a droplet impacting a wettability-controlled surface. When the droplet eccentrically impacts on the boundary between the superhydrophobic part and the hydrophilic part, it undergoes spreading, retracting, departure, throwing, and breaking up stages, and finally bounces off directionally. The directional transportation distance could even reach more than ten times the droplet size, considered the adhesion length (i.e., covering length on the hydrophilic part by the droplet at the maximum spreading) is optimized. However, there is a critical adhesion length, above which the directional transportation does not occur. To be more generalized, the adhesion length is de-dimensionalized by the maximum spreading radius, and the results show that as the dimensionless adhesion length increases, the transportation distance first increases and then decreases to zero. Under the present impacting conditions, the optimal dimensionless adhesion length corresponding to the maximum transportation distance is near 0.4, and the critical dimensionless adhesion length is about 0.7. These results provide a fundamental understanding of droplet directional transportation and could be useful for related engineering applications.
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Affiliation(s)
- Fuqiang Chu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
- School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
| | - Jia Luo
- School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
- Shenyuan Honors College, Beihang University, Beijing 100191, China
| | - Chonglei Hao
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
| | - Jun Zhang
- School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
| | - Xiaomin Wu
- Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Dongsheng Wen
- School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
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53
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Li H, Fang W, Zhao Z, Li A, Li Z, Li M, Li Q, Feng X, Song Y. Droplet Precise Self‐Splitting on Patterned Adhesive Surfaces for Simultaneous Multidetection. Angew Chem Int Ed Engl 2020; 59:10535-10539. [DOI: 10.1002/anie.202003839] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Indexed: 12/15/2022]
Affiliation(s)
- Huizeng Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Wei Fang
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Zhipeng Zhao
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - An Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zheng Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Mingzhu Li
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
| | - Qunyang Li
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Xiqiao Feng
- AML, CNMM, and Department of Engineering Mechanics, and State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China
| | - Yanlin Song
- Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
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54
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Yan C, Jiang P, Jia X, Wang X. 3D printing of bioinspired textured surfaces with superamphiphobicity. NANOSCALE 2020; 12:2924-2938. [PMID: 31993618 DOI: 10.1039/c9nr09620e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Natural superwettable surfaces have received extensive attention due to their unique wetting performance and functionalities. Inspired by nature, artificial surfaces with superwettability, particularly superamphiphobicity, i.e., superhydrophobicity and superoleophobicity, have been widely developed using various methods and techniques, where 3D printing, which is also called additive manufacturing, is an emerging technique. 3D printing is efficient for rapid and precise prototyping with the advantage of fabricating various architectures and structures with extreme complexity. Therefore, it is promising for building bioinspired superamphiphobic surfaces with structural complexity in a facile manner. Herein, the state-of-the-art 3D printing techniques and methods for fabricating superwettable surfaces with micro/nanostructures are reviewed, followed by an overview of their extensive applications, which are believed to be promising in engineered wettability, bionic science, liquid transport, microfluidics, drag reduction, anti-fouling, oil/water separation, etc.
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Affiliation(s)
- Changyou Yan
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100039, China
| | - Pan Jiang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100039, China
| | - Xin Jia
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
| | - Xiaolong Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. and School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China and Yiwu R&D Centre for Functional Materials, LICP, CAS, Yiwu 322000, China
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55
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Yu F, Lin S, Yang J, Fan Y, Wang D, Chen L, Deng X. Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1902687. [PMID: 32099762 PMCID: PMC7029656 DOI: 10.1002/advs.201902687] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/14/2019] [Indexed: 06/04/2023]
Abstract
It is widely acknowledged that splash impact can be suppressed by increasing the viscosity of the impinging drop. In this work, however, by imposing a highly viscous drop to a low-viscosity drop, it is demonstrated that the splash of the low-viscosity part of this Janus drop on superamphiphobic surfaces can be significantly promoted. The underlying mechanism is that the viscous stress exerted by the low-viscosity component drives the viscous component moving in the opposite direction, enhancing the spreading of the low-viscosity side and thereby its rim instability. The threshold velocity, above which splashing occurs, can be tuned by varying the viscosity ratio of the Janus drop. Moreover, the impact of the Janus drop can be employed to verify the mechanism of splash.
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Affiliation(s)
- Fanfei Yu
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Shiji Lin
- School of PhysicsUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Jinlong Yang
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Yue Fan
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Dehui Wang
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Longquan Chen
- School of PhysicsUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
| | - Xu Deng
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054P. R. China
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56
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Olshin PK, Voss JM, Drabbels M, Lorenz UJ. Real-time observation of jumping and spinning nanodroplets. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2020; 7:011101. [PMID: 31966988 PMCID: PMC6960032 DOI: 10.1063/1.5135699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 01/01/2020] [Indexed: 05/06/2023]
Abstract
The manipulation of liquids at nanoscale dimensions is a central goal of the emergent nanofluidics field. Such endeavors extend to nanodroplets, which are ubiquitous objects involved in many technological applications. Here, we employ time-resolved electron microscopy to elucidate the formation of so-called jumping nanodroplets on a graphene surface. We flash-melt a thin gold nanostructure with a laser pulse and directly observe how the resulting nanodroplet contracts into a sphere and jumps off its substrate, a process that occurs in just a few nanoseconds. Our study provides the first experimental characterization of these morphological dynamics through real-time observation and reveals new aspects of the phenomenon. We observe that friction alters the trajectories of individual droplets. Surprisingly, this leads some droplets to adopt dumbbell-shaped geometries after they jump, suggesting that they spin with considerable angular momentum. Our experiments open up new avenues for studying and controlling the fast morphological dynamics of nanodroplets through their interaction with structured surfaces.
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Affiliation(s)
- Pavel K. Olshin
- Laboratory of Molecular Nanodynamics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Jonathan M. Voss
- Laboratory of Molecular Nanodynamics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Marcel Drabbels
- Laboratory of Molecular Nanodynamics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Ulrich J. Lorenz
- Laboratory of Molecular Nanodynamics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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57
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Wu H, Jiang K, Xu Z, Yu S, Peng X, Zhang Z, Bai H, Liu A, Chai G. Theoretical and Experimental Studies on the Controllable Pancake Bouncing Behavior of Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:17000-17008. [PMID: 31786923 DOI: 10.1021/acs.langmuir.9b03153] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A droplet that impacts on a superhydrophobic surface will undergo a process of unfolding, contracting, and finally rebounding from the surface. With regards to the pancake bouncing behavior of a droplet, since the retraction process of the droplet is omitted, the contact time is greatly shortened compared to the normal type of bouncing. However, the quantitative prediction to the range of droplet pancake bouncing and the adjustment of pancake bouncing state have yet to be probed into. In this paper, we reported the controllable pancake bouncing of droplets by adjusting the size of the superhydrophobic surface with microstructures. In addition, we also discovered a dimensional effect with regards to pancake bouncing, namely, the pancake bouncing would be more likely to happen on the surfaces with large post spacing for the droplet with the larger radius. The contact time could be reduced to 2 ms by adjusting the size of the microstructures and the radius of the droplets. Based on the relationship between the droplet bouncing state and the surface microstructure size, we are able to propose reasonable dimensions for the surfaces in order to control pancake bouncing.
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Affiliation(s)
- Huaping Wu
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Kunpeng Jiang
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Zhenxiong Xu
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Sihang Yu
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Xiang Peng
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Zheng Zhang
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
| | - Hao Bai
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering , Zhejiang University , Hangzhou 310027 , China
| | - Aiping Liu
- Center for Optoelectronics Materials and Devices , Zhejiang Sci-Tech University , Hangzhou 310018 , China
| | - Guozhong Chai
- Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China
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58
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Pan S, Guo R, Richardson JJ, Berry JD, Besford QA, Björnmalm M, Yun G, Wu R, Lin Z, Zhong Q, Zhou J, Sun Q, Li J, Lu Y, Dong Z, Banks MK, Xu W, Jiang J, Jiang L, Caruso F. Ricocheting Droplets Moving on Super-Repellent Surfaces. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1901846. [PMID: 31728297 PMCID: PMC6839626 DOI: 10.1002/advs.201901846] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/15/2019] [Indexed: 05/08/2023]
Abstract
Droplet bouncing on repellent solid surfaces (e.g., the lotus leaf effect) is a common phenomenon that has aroused interest in various fields. However, the scenario of a droplet bouncing off another droplet (either identical or distinct chemical composition) while moving on a solid material (i.e., ricocheting droplets, droplet billiards) is scarcely investigated, despite it having fundamental implications in applications including self-cleaning, fluid transport, and heat and mass transfer. Here, the dynamics of bouncing collisions between liquid droplets are investigated using a friction-free platform that ensures ultrahigh locomotion for a wide range of probing liquids. A general prediction on bouncing droplet-droplet contact time is elucidated and bouncing droplet-droplet collision is demonstrated to be an extreme case of droplet bouncing on surfaces. Moreover, the maximum deformation and contact time are highly dependent on the position where the collision occurs (i.e., head-on or off-center collisions), which can now be predicted using parameters (i.e., effective velocity, effective diameter) through the concept of an effective interaction region. The results have potential applications in fields ranging from microfluidics to repellent coatings.
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Affiliation(s)
- Shuaijun Pan
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Rui Guo
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Joseph J. Richardson
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Joseph D. Berry
- Department of Chemical Engineering and the Particulate Fluids Processing CentreThe University of MelbourneParkvilleVictoria3010Australia
| | - Quinn A. Besford
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Mattias Björnmalm
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
- Department of MaterialsDepartment of Bioengineering, and the Institute of Biomedical EngineeringImperial College LondonLondonSW7 2AZUK
| | - Gyeongwon Yun
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Ruoxi Wu
- Zachry Department of Civil EngineeringTexas A&M University3136 TAMUCollege StationTX77843‐3136USA
- Department of Water Science and EngineeringCollege of Civil EngineeringHunan UniversityChangsha410082China
| | - Zhixing Lin
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Qi‐Zhi Zhong
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Jiajing Zhou
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Qiang Sun
- Department of Chemical Engineering and the Particulate Fluids Processing CentreThe University of MelbourneParkvilleVictoria3010Australia
| | - Jianhua Li
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
| | - Yanbing Lu
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China
| | - Zhichao Dong
- CAS Key Laboratory of Bio‐inspired Materials and Interfacial SciencesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China
| | - Margaret Katherine Banks
- Zachry Department of Civil EngineeringTexas A&M University3136 TAMUCollege StationTX77843‐3136USA
| | - Weijian Xu
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China
| | - Jianhui Jiang
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China
| | - Lei Jiang
- CAS Key Laboratory of Bio‐inspired Materials and Interfacial SciencesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China
| | - Frank Caruso
- ARC Centre of Excellence in Convergent Bio‐Nano Science and Technology, and the Department of Chemical EngineeringThe University of MelbourneParkvilleVictoria3010Australia
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59
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Zhang X, Sun L, Wang Y, Bian F, Wang Y, Zhao Y. Multibioinspired slippery surfaces with wettable bump arrays for droplets pumping. Proc Natl Acad Sci U S A 2019; 116:20863-20868. [PMID: 31570600 PMCID: PMC6800372 DOI: 10.1073/pnas.1912467116] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Droplet manipulation is playing an important role in various fields, including scientific research, industrial production, and daily life. Here, inspired by the microstructures and functions of Namib desert beetles, Nepenthes pitcher plants, and emergent aquatic plants, we present a multibioinspired slippery surface for droplet manipulation by employing combined strategies of bottom-up colloidal self-assembly, top-down photolithography, and microstructured mold replication. The resultant multilayered hierarchical wettability surface consists of hollow hydrogel bump arrays and a lubricant-infused inverse opal film as the substrate. Based on capillary force, together with slippery properties of the substrate and wettability of the bump arrays, water droplets from all directions can be attracted to the bumps and be collected through hollow channels to a reservoir. Independent of extra energy input, droplet condensation, or coalescence, these surfaces have shown ideal droplet pumping and water collection efficiency. In particular, these slippery surfaces also exhibit remarkable features including versatility, generalization, and recyclability in practical use such as small droplet collection, which make them promising candidates for a wide range of applications.
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Affiliation(s)
- Xiaoxuan Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
| | - Lingyu Sun
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
| | - Yu Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
| | - Feika Bian
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
| | - Yuetong Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
| | - Yuanjin Zhao
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 210096 Nanjing, China
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60
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Zheng Y, Zhang C, Wang J, Liu Y, Shen C, Yang J. Robust adhesion of droplets via heterogeneous dynamic petal effects. J Colloid Interface Sci 2019; 557:737-745. [PMID: 31563606 DOI: 10.1016/j.jcis.2019.09.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/18/2019] [Accepted: 09/19/2019] [Indexed: 12/11/2022]
Abstract
HYPOTHESIS Bionics and dynamic interface wetting intensely appeal to many research communities due to their unique practical implications. The rose petals had a highly robust dynamic water-retaining capacity under heavy precipitation. We predicted that the roses became more "hydrophilic" at higher Weber numbers. EXPERIMENTS Fresh rose petals were directly impacted by droplets, and facile artificial petal-like substrates and superhydrophobic substrates were used in the comparative analysis. The wetting dynamics of the droplet (e.g., topography, bounce dynamics, contact time, three-phase contact lines, and oscillations) were investigated when interacting with four selected target substrates. FINDINGS The present work first time investigated the dynamic wetting rule of the sticky superhydrophobic substrates (SSHS). Simulated and experimental investigations confirmed that the unique coupling synergy between the pinning effect and the inhomogeneous micropapillaes resulted in lopsided contact line velocities, which remarkably suppressed the lateral oscillation and rebounding. This may be a new strategy when designing dynamic water-repellent surfaces and open a promising avenue for emerging areas such as super-efficiency energy conversion and harvesting.
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Affiliation(s)
- Yihua Zheng
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China.
| | - Chengchun Zhang
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China; State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, 130022, China.
| | - Jing Wang
- College of Physics, Jilin University, Changchun 130012, China.
| | - Yan Liu
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China.
| | - Chun Shen
- State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, 130022, China.
| | - Junfeng Yang
- School of Mechanical Engineering, University of Leeds, LS2 9JT, United Kingdom.
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61
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Carbonaro A, Cipelletti L, Truzzolillo D. Spinning Drop Dynamics in Miscible and Immiscible Environments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11330-11339. [PMID: 31403308 DOI: 10.1021/acs.langmuir.9b02091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report on the extensional dynamics of spinning drops in miscible and immiscible background fluids following a rotational speed jump. Two radically different behaviors are observed. Drops in immiscible environments relax exponentially to their equilibrium shape, with a relaxation time that does not depend on the centrifugal force. We find an excellent quantitative agreement with the relaxation time predicted for quasi-spherical drops by Stone and Bush (Q. Appl. Math. 1996, 54, 551), while other models proposed in the literature fail to capture our data. By contrast, drops immersed in a miscible background fluid do not relax to a steady shape: they elongate indefinitely, their length following a power-law l(t)∼t2/5 in very good agreement with the dynamics predicted by Lister and Stone (J. Fluid Mech. 1996, 317, 275) for inviscid drops. Our results strongly suggest that low compositional gradients in miscible fluids do not give rise to an effective interfacial tension measurable by spinning drop tensiometry.
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Affiliation(s)
- Alessandro Carbonaro
- Laboratoire Charles Coulomb (L2C)UMR 5221, CNRS-Université de Montpellier , Montpellier , France
| | - Luca Cipelletti
- Laboratoire Charles Coulomb (L2C)UMR 5221, CNRS-Université de Montpellier , Montpellier , France
| | - Domenico Truzzolillo
- Laboratoire Charles Coulomb (L2C)UMR 5221, CNRS-Université de Montpellier , Montpellier , France
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62
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Liu Z, Zheng H, Zhang H, Han Y, Chen Y, Huang L, Wang X, Liu X, Yang X. Fabrication of Wettability Mesh with Quasi-Rectangular-Restraining Capacity to Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9177-9183. [PMID: 31265303 DOI: 10.1021/acs.langmuir.9b01418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A water droplet placed on a surface is usually round owing to surface tension. Restraining a droplet to a rectangle shape has been rarely reported. Herein, we fabricated three meshes with diverse wettability including ordinary mesh, superhydropilic mesh, and quasi-rectangular-restraining mesh. The profiles of water droplets on these three meshes were entirely different from the top view, especially for the quasi-rectangular-restraining mesh, which enables the water droplet on it to achieve the rectangular shape. The surface morphologies and chemical compositions of the meshes were characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Moreover, the influences of processing parameters of the quasi-rectangular-restraining mesh on the quasi-rectangular quality of the water droplet on it were investigated to obtain the relatively optimum processing parameters. The dynamic properties of water droplets on the three meshes were compared, and forces acting on the water droplets during the spreading and shrinking processes on the three meshes were qualitatively analyzed. Additionally, we studied the influences of falling height and water volume on the quasi-rectangular quality of the water droplet on the quasi-rectangular-restraining mesh. Water droplets on the quasi-rectangular-restraining mesh demonstrated good stability under vibration and the droplet could maintain the quasi-rectangular quality on the quasi-rectangular-restraining mesh for about 7 days, revealing a good durability. Further, the large-scaled fabrication of the quasi-rectangular-restraining mesh was realized.
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Affiliation(s)
- Ziai Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Huanxi Zheng
- Department of Mechanical Engineering , City University of Hong Kong , Hong Kong 999077 , China
| | - Heng Zhang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Yuqi Han
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Yang Chen
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Liu Huang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Xuyue Wang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Xin Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , China
| | - Xiaolong Yang
- National Key Laboratory of Science and Technology on Helicopter Transmission , Nanjing University of Aeronautics and Astronautics , Nanjing 210016 , China
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