1
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Tang S, Li Q, Li W, Chen S. Enhancement and Predictable Guidance of Coalescence-Induced Droplet Jumping on V-Shaped Superhydrophobic Surfaces with a Ridge. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39133052 DOI: 10.1021/acs.langmuir.4c01809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/13/2024]
Abstract
Coalescence-induced droplet jumping has attracted significant attention in recent years. However, achieving a high jumping velocity while predictably regulating the jumping direction of the merged droplets by simple superhydrophobic structures remains a challenge. In this work, a novel V-shaped superhydrophobic surface with a ridge is conceived for enhanced and predictably guided coalescence-induced droplet jumping. By conducting experiments and lattice Boltzmann simulations, it is found that the presence of a ridge in the V-shaped superhydrophobic surface can modify the fluid dynamics during the droplet coalescence process, resulting in a much higher droplet jumping velocity than that achieved by the V-shaped superhydrophobic surface without a ridge. The enhancement of the droplet jumping velocity is mainly attributed to the combined effect of the earlier and more sufficient impingement between the liquid bridge and the ridge, as well as the accelerated droplet contraction by redirecting the internal liquid flow toward the jumping direction. A high normalized jumping velocity of V j * ≈ 0.71 is achieved by the newly designed surface, with a 930% increase in the energy conversion efficiency in comparison with that on a flat surface. Moreover, adjusting the opening direction of the V-groove at different groove angles is found to be an effective method to regulate the droplet jumping direction and expand the range of the jumping angle. Particularly, the droplet jumping angle can be well predicted based on the rotational angle (ω) and the groove angle (α), i.e., θj,p ≈ 90° - 0.5α - ω.
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Affiliation(s)
- Shi Tang
- School of Energy Science and Engineering, Central South University, Changsha 410083, China
| | - Qing Li
- School of Energy Science and Engineering, Central South University, Changsha 410083, China
| | - Wanxin Li
- School of Energy Science and Engineering, Central South University, Changsha 410083, China
| | - Shoutian Chen
- School of Energy Science and Engineering, Central South University, Changsha 410083, China
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2
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Zhang J, Williams G, Jitniyom T, Singh NS, Saal A, Riordan L, Berrow M, Churm J, Banzhaf M, de Cogan F, Gao N. Wettability and Bactericidal Properties of Bioinspired ZnO Nanopillar Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7353-7363. [PMID: 38536768 PMCID: PMC11008234 DOI: 10.1021/acs.langmuir.3c03537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/14/2024] [Accepted: 03/18/2024] [Indexed: 04/10/2024]
Abstract
Nanomaterials of zinc oxide (ZnO) exhibit antibacterial activities under ambient illumination that result in cell membrane permeability and disorganization, representing an important opportunity for health-related applications. However, the development of antibiofouling surfaces incorporating ZnO nanomaterials has remained limited. In this work, we fabricate superhydrophobic surfaces based on ZnO nanopillars. Water droplets on these superhydrophobic surfaces exhibit small contact angle hysteresis (within 2-3°) and a minimal tilting angle of 1°. Further, falling droplets bounce off when impacting the superhydrophobic ZnO surfaces with a range of Weber numbers (8-46), demonstrating that the surface facilitates a robust Cassie-Baxter wetting state. In addition, the antibiofouling efficacy of the surfaces has been established against model pathogenic Gram-positive bacteria Staphylococcus aureus (S. aureus) and Gram-negative bacteria Escherichia coli (E. coli). No viable colonies of E. coli were recoverable on the superhydrophobic surfaces of ZnO nanopillars incubated with cultured bacterial solutions for 18 h. Further, our tests demonstrate a substantial reduction in the quantity of S. aureus that attached to the superhydrophobic ZnO nanopillars. Thus, the superhydrophobic ZnO surfaces offer a viable design of antibiofouling materials that do not require additional UV illumination or antimicrobial agents.
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Affiliation(s)
- Jitao Zhang
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Georgia Williams
- School
of Biosciences, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Thanaphun Jitniyom
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Navdeep Sangeet Singh
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Alexander Saal
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Lily Riordan
- School
of Pharmacy, University of Nottingham, University
Park, Nottingham NG7 2RD, United Kingdom
| | - Madeline Berrow
- School
of Pharmacy, University of Nottingham, University
Park, Nottingham NG7 2RD, United Kingdom
| | - James Churm
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Manuel Banzhaf
- School
of Biosciences, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
| | - Felicity de Cogan
- School
of Pharmacy, University of Nottingham, University
Park, Nottingham NG7 2RD, United Kingdom
| | - Nan Gao
- School
of Engineering, University of Birmingham, Edgbaston ,Birmingham B15 2TT, United Kingdom
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3
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Song X, Man J, Qiu Y, Wang J, Liu J, Li R, Zhang Y, Li J, Li J, Chen Y. Design, preparation, and characterization of lubricating polymer brushes for biomedical applications. Acta Biomater 2024; 175:76-105. [PMID: 38128641 DOI: 10.1016/j.actbio.2023.12.024] [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: 09/11/2023] [Revised: 11/21/2023] [Accepted: 12/14/2023] [Indexed: 12/23/2023]
Abstract
The lubrication modification of biomedical devices significantly enhances the functionality of implanted interventional medical devices, thereby providing additional benefits for patients. Polymer brush coating provides a convenient and efficient method for surface modification while ensuring the preservation of the substrate's original properties. The current research has focused on a "trial and error" method to finding polymer brushes with superior lubricity qualities, which is time-consuming and expensive, as obtaining effective and long-lasting lubricity properties for polymer brushes is difficult. This review summarizes recent research advances in the biomedical field in the design, material selection, preparation, and characterization of lubricating and antifouling polymer brushes, which follow the polymer brush development process. This review begins by examining various approaches to polymer brush design, including molecular dynamics simulation and machine learning, from the fundamentals of polymer brush lubrication. Recent advancements in polymer brush design are then synthesized and potential avenues for future research are explored. Emphasis is placed on the burgeoning field of zwitterionic polymer brushes, and highlighting the broad prospects of supramolecular polymer brushes based on host-guest interactions in the field of self-repairing polymer brush applications. The review culminates by providing a summary of methodologies for characterizing the structural and functional attributes of polymer brushes. It is believed that a development approach for polymer brushes based on "design-material selection-preparation-characterization" can be created, easing the challenge of creating polymer brushes with high-performance lubricating qualities and enabling the on-demand creation of coatings. STATEMENT OF SIGNIFICANCE: Biomedical devices have severe lubrication modification needs, and surface lubrication modification by polymer brush coating is currently the most promising means. However, the design and preparation of polymer brushes often involves "iterative testing" to find polymer brushes with excellent lubrication properties, which is both time-consuming and expensive. This review proposes a polymer brush development process based on the "design-material selection-preparation-characterization" strategy and summarizes recent research advances and trends in the design, material selection, preparation, and characterization of polymer brushes. This review will help polymer brush researchers by alleviating the challenges of creating polymer brushes with high-performance lubricity and promises to enable the on-demand construction of polymer brush lubrication coatings.
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Affiliation(s)
- Xinzhong Song
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China
| | - Jia Man
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China.
| | - Yinghua Qiu
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China
| | - Jiali Wang
- Qilu Hospital of Shandong University, Jinan 250012, PR China
| | - Jianing Liu
- Qilu Hospital of Shandong University, Jinan 250012, PR China
| | - Ruijian Li
- Qilu Hospital of Shandong University, Jinan 250012, PR China
| | - Yongqi Zhang
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China
| | - Jianyong Li
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China
| | - Jianfeng Li
- Key Laboratory of High Efficiency and Clean Mechanicalanufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China; Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China
| | - Yuguo Chen
- Qilu Hospital of Shandong University, Jinan 250012, PR China
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4
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Liu C, Zhao M, Guo J, Zhang S, Song L, Zheng Y. Exploration of Sweeping Effect: Droplet Coalescence Jumping of a Rolling and Static Droplet. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2278-2287. [PMID: 38237057 DOI: 10.1021/acs.langmuir.3c03364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
The sweeping effect of merged droplets plays a key role in enhancing application performance due to the continuing coalescence caused by the horizontal jumping velocity. Most studies focused on static droplet coalescence jumping, while moving droplet coalescence is poorly understood. In this work, we experimentally and numerically study the coalescence of a rolling droplet and a static one. When the droplet radius ratio is larger than 0.8, as the dimensionless initial velocity increases and the vertical jumping velocity first decreases and then increases. The critical dimensionless initial velocity Vc* corresponding to the minimum vertical jumping velocity could be estimated as 0.9 ( r s 2 r m 2 ) . When the droplet radius ratio is smaller than 0.8, the dimensionless initial velocity has a positive effect on the vertical jumping velocity. The mechanism of the vertical jumping velocity can be attributed to two parts: liquid bridge impact and retraction of the merged droplet. The squeezing effect generated by the initial velocity between the two droplets promotes the growth of the liquid bridge and enhances the impact effect of the liquid bridge but weakens the upward velocity accumulation caused by the retraction of the merged droplets. However, different from the vertical jumping velocity, the horizontal jumping velocity is approximately proportional to the dimensionless initial velocity. The outcome of our work elucidates a fundamental understanding of a rolling droplet coalescing with a static one.
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Affiliation(s)
- Chuntian Liu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Meirong Zhao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Jinwei Guo
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Shiyu Zhang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Le Song
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yelong Zheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
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5
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Qiu L, Qian S, Ni Y, Tong Q. Optimum substrate stiffness in coalescence-induced droplet jumping. Phys Chem Chem Phys 2023; 25:14368-14373. [PMID: 37183923 DOI: 10.1039/d3cp00835e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
When droplets are brought into contact and coalesced on a superhydrophobic surface, the kinetic energy converted from the surface energy enables the merged droplet to jump. Current studies mainly focus on the microstructure of surfaces and the properties of droplets that influence the jumping dynamics. Here, by means of molecular dynamics, we investigate the coalescence-induced jumping of nanodroplets on soft substrates. The optimum stiffness of the substrate is suggested and the mechanism involved is demonstrated through the analysis of the interactions between the droplets and the substrates. The momentum of the droplet is evaluated by integrating the forces from the substrate. The optimum stiffness for jumping velocity is provided by the competition between the impact and the adhesion from the substrate during the process, which are both closely related to the stiffness. The results may inspire fundamental research and applications in a broad scope.
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Affiliation(s)
- Lianfu Qiu
- Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
| | - Sheng Qian
- Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
| | - Yifeng Ni
- Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
- Shanghai Minghua Electric Power Science & Technology Co., Ltd., Shanghai 200090, China
| | - Qi Tong
- Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
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6
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Burks GR, Yao L, Kalutantirige FC, Gray KJ, Bello E, Rajagopalan S, Bialik SB, Barrick JE, Alleyne M, Chen Q, Schroeder CM. Electron Tomography and Machine Learning for Understanding the Highly Ordered Structure of Leafhopper Brochosomes. Biomacromolecules 2023; 24:190-200. [PMID: 36516996 DOI: 10.1021/acs.biomac.2c01035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Insects known as leafhoppers (Hemiptera: Cicadellidae) produce hierarchically structured nanoparticles known as brochosomes that are exuded and applied to the insect cuticle, thereby providing camouflage and anti-wetting properties to aid insect survival. Although the physical properties of brochosomes are thought to depend on the leafhopper species, the structure-function relationships governing brochosome behavior are not fully understood. Brochosomes have complex hierarchical structures and morphological heterogeneity across species, due to which a multimodal characterization approach is required to effectively elucidate their nanoscale structure and properties. In this work, we study the structural and mechanical properties of brochosomes using a combination of atomic force microscopy (AFM), electron microscopy (EM), electron tomography, and machine learning (ML)-based quantification of large and complex scanning electron microscopy (SEM) image data sets. This suite of techniques allows for the characterization of internal and external brochosome structures, and ML-based image analysis methods of large data sets reveal correlations in the structure across several leafhopper species. Our results show that brochosomes are relatively rigid hollow spheres with characteristic dimensions and morphologies that depend on leafhopper species. Nanomechanical mapping AFM is used to determine a characteristic compression modulus for brochosomes on the order of 1-3 GPa, which is consistent with crystalline proteins. Overall, this work provides an improved understanding of the structural and mechanical properties of leafhopper brochosomes using a new set of ML-based image classification tools that can be broadly applied to nanostructured biological materials.
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Affiliation(s)
- Gabriel R Burks
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Lehan Yao
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Falon C Kalutantirige
- Department of Chemistry, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Kyle J Gray
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Elizabeth Bello
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Entomology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Shreyas Rajagopalan
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Entomology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Sarah B Bialik
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Jeffrey E Barrick
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Marianne Alleyne
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Entomology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Qian Chen
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Chemistry, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Charles M Schroeder
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States.,Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
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7
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Bello E, Chen Y, Alleyne M. Staying Dry and Clean: An Insect's Guide to Hydrophobicity. INSECTS 2022; 14:42. [PMID: 36661970 PMCID: PMC9861782 DOI: 10.3390/insects14010042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/11/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
Insects demonstrate a wide diversity of microscopic cuticular and extra-cuticular features. These features often produce multifunctional surfaces which are greatly desired in engineering and material science fields. Among these functionalities, hydrophobicity is of particular interest and has gained recent attention as it often results in other properties such as self-cleaning, anti-biofouling, and anti-corrosion. We reviewed the historical and contemporary scientific literature to create an extensive review of known hydrophobic and superhydrophobic structures in insects. We found that numerous insects across at least fourteen taxonomic orders possess a wide variety of cuticular surface chemicals and physical structures that promote hydrophobicity. We discuss a few bioinspired design examples of how insects have already inspired new technologies. Moving forward, the use of a bioinspiration framework will help us gain insight into how and why these systems work in nature. Undoubtedly, our fundamental understanding of the physical and chemical principles that result in functional insect surfaces will continue to facilitate the design and production of novel materials.
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Affiliation(s)
- Elizabeth Bello
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yutao Chen
- Program in Ecology, Evolution and Conservation Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Marianne Alleyne
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Program in Ecology, Evolution and Conservation Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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8
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Wang Z, Yao D, He Z, Liu Y, Wang H, Zheng Y. Fabrication of Durable, Chemically Stable, Self-Healing Superhydrophobic Fabrics Utilizing Gellable Fluorinated Block Copolymer for Multifunctional Applications. ACS APPLIED MATERIALS & INTERFACES 2022; 14:48106-48122. [PMID: 36240508 DOI: 10.1021/acsami.2c12895] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Limited durability and complex materials restrict the application of superhydrophobic fabrics in daily life. In this work, gellable fluorinated block copolymer poly(dodecafluoroheptyl methacrylate)-block-poly(3-(triethoxysilyl)propyl methacrylate) (PDFMA-b-PTEPM) was used to fabricate adhesive-free superhydrophobic poly(ethylene terephthalate) (PET) fabrics via a simple dip-coating technology and sol-gel reaction. The growth of silica nanoparticles builds up a rough hierarchical structure and provides sol-gel reaction sites of PTEPM segments. The grafting of block copolymer significantly reduced the surface free energy of the fabrics, resulting in an excellent superhydrophobicity with a water contact angle of 160.2°. Benefiting from extensive chemical bond grafting and cross-linking of the PTEPM segment, the fabric exhibits excellent durability in mechanical abrasion, chemical treatment, and washing. The coating has withstood 50 sandpaper abrasion cycles and 400 soft friction cycles and can maintain superhydrophobic properties in various solvents, freezing and a wide pH range. These superhydrophobic fabrics with a long life span possess self-cleaning, anti-icing, oil-water separation, and self-healing capabilities. The multifunctional fabrics developed in this study are durable and easy to produce, possessing the potential for applications in industry and daily life.
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Affiliation(s)
- Zehao Wang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
| | - Dongdong Yao
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
| | - Zhongjie He
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
| | - Yisong Liu
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
| | - Hongni Wang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
| | - Yaping Zheng
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi710129, People's Republic of China
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9
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Yan X, Ji B, Feng L, Wang X, Yang D, Rabbi KF, Peng Q, Hoque MJ, Jin P, Bello E, Sett S, Alleyne M, Cropek DM, Miljkovic N. Particulate-Droplet Coalescence and Self-Transport on Superhydrophobic Surfaces. ACS NANO 2022; 16:12910-12921. [PMID: 35960260 DOI: 10.1021/acsnano.2c05267] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Particulate transport from surfaces governs a variety of phenomena including fungal spore dispersal, bioaerosol transmission, and self-cleaning. Here, we report a previously unidentified mechanism governing passive particulate removal from superhydrophobic surfaces, where a particle coalescing with a water droplet (∼10 to ∼100 μm) spontaneously launches. Compared to previously discovered coalescence-induced binary droplet jumping, the reported mechanism represents a more general capillary-inertial dominated transport mode coupled with particle/droplet properties and is typically mediated by rotation in addition to translation. Through wetting and momentum analyses, we show that transport physics depends on particle/droplet density, size, and wettability. The observed mechanism presents a simple and passive pathway to achieve self-cleaning on both artificial as well as biological materials as confirmed here with experiments conducted on butterfly wings, cicada wings, and clover leaves. Our findings provide insights into particle-droplet interaction and spontaneous particulate transport, which may facilitate the development of functional surfaces for medical, optical, thermal, and energy applications.
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Affiliation(s)
- Xiao Yan
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Bingqiang Ji
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Lezhou Feng
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Xiong Wang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Daolong Yang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kazi Fazle Rabbi
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Qi Peng
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Muhammad Jahidul Hoque
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Puhang Jin
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Elizabeth Bello
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Soumyadip Sett
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Marianne Alleyne
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Donald M Cropek
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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10
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Gao Y, Ke Z, Yang W, Wang Z, Zhang Y, Wu W. Coalescence-Induced Droplet Jumping on Honeycomb Bionic Superhydrophobic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9981-9991. [PMID: 35917142 DOI: 10.1021/acs.langmuir.2c01335] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Condensation-induced jumping of droplets on superhydrophobic surfaces has received extensive attention because of its great potential for applications in areas such as condensation enhancement and self-cleaning. However, the jumping efficiency of droplets on flat superhydrophobic surfaces is very low, and there is no reliable means of achieving efficient droplet jumping on large scales, which greatly limits its application. To this end, we developed a class of honeycomb bionic superhydrophobic surfaces (HBSS) that enable reliable and efficient droplet jumping on a large scale for the first time and performed experimental and simulation studies on droplet condensation and jumping on this kind of surface. Condensation experiments show that condensate droplets on HBSS can be effectively positioned under the influence of gravity and the uniformity of the droplet diameter is ensured, laying the foundation for achieving efficient jumping. The shape and geometric parameters of HBSS have a significant impact on the droplet jumping efficiency, and the maximum dimensionless jumping velocity of droplet jumping was experimentally measured to be 0.747, corresponding to an efficiency of about 45.25%. Combining with the results of simulation calculations, we found that the surface structure of HBSS can promote more of the excess surface energy to net upward kinetic energy along an extremely efficient and simple pathway (direct conversion), thus achieving an energy conversion efficiency of over 45%.
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Affiliation(s)
- Yan Gao
- Advanced Manufacturing School, Nanchang University, Nanchang 330031, Jiangxi, China
| | - Zhaoqing Ke
- Advanced Manufacturing School, Nanchang University, Nanchang 330031, Jiangxi, China
| | - Wei Yang
- Advanced Manufacturing School, Nanchang University, Nanchang 330031, Jiangxi, China
| | - Zhiqiang Wang
- Advanced Manufacturing School, Nanchang University, Nanchang 330031, Jiangxi, China
| | - Ying Zhang
- Advanced Manufacturing School, Nanchang University, Nanchang 330031, Jiangxi, China
| | - Wei Wu
- ALD Research Institute, ALD Group Limited, Shenzhen 518108, Guangdong, China
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11
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Zhang W, Zhu X, Chen Z, Belotelov VI, Song Y. Silver Nanopillar Arrayed Thin Films with Highly Surface-Enhanced Raman Scattering for Ultrasensitive Detection. ACS OMEGA 2022; 7:25726-25731. [PMID: 35910149 PMCID: PMC9330273 DOI: 10.1021/acsomega.2c03022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Surface-enhanced Raman scattering (SERS) technique based on surface plasmon resonance has been considerably investigated in recent years due to its superior sensitivity in the detection of organic or biological molecules at trace levels. However, most research usually focuses on artificial architectures as SERS substrates that always have a complex and expensive micro-nanofabrication process. The high cost of masks for SERS substrates becomes a key obstacle for the widespread commercialization of SERS technology. In this paper, a biomimetic SERS substrate composed of silver-coated nanopillar arrays on the top of a cicada wing was advanced to overcome these challenges as both substrates and masks. Benefiting from the high near-field plasmon resonance coupling at the limited space among neighboring nanopillars, a dramatically increased SERS signal can be achieved using rhodamine 6G (R6G) as a model molecule. Encouragingly, the analytical enhancement factor of the order of more than 108 has been conveniently realized with a reliable detection concentration of R6G of about 100 pM or less. This work provides a promising route for designing cost-effective and highly sensitive SERS substrates and the related mask fabrication using our previously proposed template transfer nanoimprint.
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Affiliation(s)
- Weiwei Zhang
- Center for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
- School of Mathematics and Physics, Hebei GEO University, 136 East Huai'an Road, Yuhua District, Shijiazhuang 050031, China
- Shunde Graduate School, University of Science and Technology Beijing. Daliang Zhihui Road 2, Shunde Distinct, Foshan 528399, China
| | - Xiaomin Zhu
- Center for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
| | - Zhanghua Chen
- Center for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
| | - Vladimir I Belotelov
- Vernadsky Crimean Federal University, Vernadskogo av. 4, Simferopol 295007, Russia
- NTI Center for Quantum Communications, National University of Science and Technology MISiS, Leninsky prospekt 4, Moscow 119049, Russia
- Photonic and Quantum Technologies School, Lomonosov Moscow State University, Leninskie Gori, 119991 Moscow, Russia
| | - Yujun Song
- Center for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
- Zhengzhou Tianzhao Biomedical Technology Company Ltd., 7 Dongqing Street, Zhengzhou High Tech Development Zone, Zhengzhou 451450, China
- Key Laboratory of Pulsed Power Translational Medicine of Zhejiang Province, Hangzhou Ruidi Biotechnology Company Ltd., Room 803, Bldg. 4, 4959 Yuhangtang Road, Cangqian Street, Hangzhou, Zhejiang 310023, China
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12
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Luo Q, Peng J, Chen X, Zhang H, Deng X, Jin S, Zhu H. Recent Advances in Multifunctional Mechanical–Chemical Superhydrophobic Materials. Front Bioeng Biotechnol 2022; 10:947327. [PMID: 35910015 PMCID: PMC9326238 DOI: 10.3389/fbioe.2022.947327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 06/06/2022] [Indexed: 02/05/2023] Open
Abstract
In recent years, biology-inspired superhydrophobic technology has attracted extensive attention and has been widely used in self-cleaning, anti-icing, oil–water separation, and other fields. However, the poor durability restricts its application in practice; thus, it is urgent to systematically summarize it so that scientists can guide the future development of this field. Here, in this review, we first elucidated five kinds of typical superhydrophobic models, namely, Young’s equation, Wenzel, Cassie–Baxter, Wenzel–Cassie, “Lotus,” and “Gecko” models. Then, we summarized the improvement in mechanical stability and chemical stability of superhydrophobic surface. Later, the durability test methods such as mechanical test methods and chemical test methods are discussed. Afterwards, we displayed the applications of multifunctional mechanical–chemical superhydrophobic materials, namely, anti-fogging, self-cleaning, oil–water separation, antibacterial, membrane distillation, battery, and anti-icing. Finally, the outlook and challenge of mechanical–chemical superhydrophobic materials are highlighted.
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Affiliation(s)
- Qinghua Luo
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
| | - Jiao Peng
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
| | - Xiaoyu Chen
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
| | - Hui Zhang
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
| | - Xia Deng
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
| | - Shiwei Jin
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, China
- *Correspondence: Shiwei Jin,
| | - Hai Zhu
- China State Key Laboratory of Biogeology and Environmental Geology, Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China
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13
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Liu C, Zhao M, Lu D, Sun Y, Song L, Zheng Y. Laplace Pressure Difference Enhances Droplet Coalescence Jumping on Superhydrophobic Structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6923-6933. [PMID: 35451848 DOI: 10.1021/acs.langmuir.2c00412] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Coalescence-induced droplet jumping has great prospects in many applications. Nevertheless, the applications are vastly limited by a low jumping velocity. Conventional methods to enhance the droplet coalescence jumping velocity are enabled by protruding structures with superhydrophobic surfaces. However, the jumping velocity improvement is limited by the height of protruding structures. Here, we present rationally designed limitation structures with superhydrophobic surfaces to achieve a dimensionless jumping velocity, Vj* ≈ 0.64. The mechanism of enhancing the jumping velocity is demonstrated through the study of numerical simulations and geometric parameters of limitation structures, providing guidelines for optimized structures. Experimental and numerical results indicate that the mechanism consists of the combined action of the velocity vectors' redirection and the Laplace pressure difference within deformed droplets trapped in limitation structures. On the basis of previous research on the mechanisms of protruding structures and our study, we successfully exploited those mechanisms to further improve the jumping velocity by combining the limitation structure with the protruding structure. Experimentally, we attained a dimensionless jumping velocity of Vj* ≈ 0.74 with an energy conversion efficiency of η ≈ 48%, breaking the jumping velocity limit. This work not only demonstrates a new mechanism for achieving a high jumping velocity and energy conversion efficiency but also sheds lights on the effect of limitation structures on coalescence hydrodynamics and elucidates a method to further enhance the jumping velocity based on protruding structures.
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Affiliation(s)
- Chuntian Liu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Meirong Zhao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Dunqiang Lu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yukai Sun
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Le Song
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yelong Zheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
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14
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Dent F, Harbottle D, Warren NJ, Khodaparast S. Temporally Arrested Breath Figure. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27435-27443. [PMID: 35658418 PMCID: PMC9204694 DOI: 10.1021/acsami.2c05635] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
Since its original conception as a tool for manufacturing porous materials, the breath figure method (BF) and its variations have been frequently used for the fabrication of numerous micro- and nanopatterned functional surfaces. In classical BF, reliable design of the final pattern has been hindered by the dual role of solvent evaporation to initiate/control the dropwise condensation and induce polymerization, alongside the complex effects of local humidity and temperature influence. Herein, we provide a deterministic method for reliable control of BF pore diameters over a wide range of length scales and environmental conditions. To this end, we employ an adapted methodology that decouples cooling from polymerization by using a combination of initiative cooling and quasi-instantaneous UV curing to deliberately arrest the desired BF patterns in time. Through in situ real-time optical microscopy analysis of the condensation kinetics, we demonstrate that an analytically predictable self-similar regime is the predominant arrangement from early to late times O(10-100 s), when high-density condensation nucleation is initially achieved on the polymer films. In this regime, the temporal growth of condensation droplets follows a unified power law of D ∝ t. Identification and quantitative characterization of the scale-invariant self-similar BF regime allow fabrication of programmed pore size, ranging from hundreds of nanometers to tens of micrometers, at high surface coverage of around 40%. Finally, we show that temporal arresting of BF patterns can be further extended for selective surface patterning and/or pore size modulation by spatially masking the UV curing illumination source. Our findings bridge the gap between fundamental knowledge of dropwise condensation and applied breath figure patterning techniques, thus enabling mechanistic design and fabrication of porous materials and interfaces.
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Affiliation(s)
- Francis
J. Dent
- School
of Mechanical Engineering, University of
Leeds, LS2 9JT Leeds, U.K.
| | - David Harbottle
- School
of Chemical and Process Engineering, University
of Leeds, LS2 9JT Leeds, U.K.
| | - Nicholas J. Warren
- School
of Chemical and Process Engineering, University
of Leeds, LS2 9JT Leeds, U.K.
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15
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Liu Y, Li X, Lu C, Yuan Z, Liu C, Zhang J, Zhao L. High-Efficiency Directional Ejection of Coalesced Drops on a Circular Groove. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:4028-4035. [PMID: 35319209 DOI: 10.1021/acs.langmuir.2c00023] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Coalescence-induced drop jumping has received significant attention in the past decade. However, its application remains challenging as a result of the low energy conversion efficiency and uncontrollable drop jumping direction. In this work, we report the high-efficiency coalescence-induced drop jumping with tunable jumping direction via rationally designed millimeter-sized circular grooves. By increasing the surface-droplet impact site area and restricting the oscillatory deformation, the energy conversion efficiency of the jumping droplet reaches 43.5%, 600% as high as the conventional superhydrophobic surfaces. The droplet jumping direction can be tuned from 90° to 60° by varying the principal curvature of the circular groove, while the energy conversion efficiency remains unchanged. We show through theoretical analysis and numerical simulations that the directional jumping mainly originates from reallocation of droplet momentum enabled by the asymmetric liquid bridge impact. Our study demonstrates a simple yet effective method for fast, efficient, and directional droplet removal, which warrants promising applications in jumping droplet condensation, water harvesting, anti-icing, and self-cleaning.
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Affiliation(s)
- Yahua Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
- Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130022, People's Republic of China
| | - Xiaojie Li
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Chenguang Lu
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Zichao Yuan
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Cong Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Junqiu Zhang
- Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, Jilin 130022, People's Republic of China
| | - Lei Zhao
- Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
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16
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Roth-Nebelsick A. How much biology is in the product? Role and relevance of biological evolution and function for bio-inspired design. Theory Biosci 2022; 141:233-247. [PMID: 35344153 PMCID: PMC9474337 DOI: 10.1007/s12064-022-00367-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 03/11/2022] [Indexed: 11/25/2022]
Abstract
Bio-inspired design (BID) means the concept of transferring functional principles from biology to technology. The core idea driving BID-related work is that evolution has shaped functional attributes, which are termed “adaptations” in biology, to a high functional performance by relentless selective pressure. For current methods and tools, such as data bases, it is implicitly supposed that the considered biological models are adaptations and their functions already clarified. Often, however, the identification of adaptations and their functional features is a difficult task which is not yet accomplished for numerous biological structures, as happens to be the case also for various organismic features from which successful BID developments were derived. This appears to question the relevance of the much stressed importance of evolution for BID. While it is obviously possible to derive an attractive technical principle from an observed biological effect without knowing its original functionality, this kind of BID (“analog BID”) has no further ties to biology. In contrast, a BID based on an adaptation and its function (“homolog BID”) is deeply embedded in biology. It is suggested that a serious and honest clarification of the functional background of a biological structure is an essential first step in devising a BID project, to recognize possible problems and pitfalls as well as to evaluate the need for further biological analysis.
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Affiliation(s)
- Anita Roth-Nebelsick
- Department of Palaeontology, State Museum of Natural History Stuttgart, Stuttgart, Germany.
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17
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Liu Y, Guo Y, Zhang X, Gao G, Shi C, Huang G, Li P, Kang Q, Huang X, Wu G. Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field. NANO RESEARCH 2022; 15:4732-4738. [PMID: 35574261 PMCID: PMC9079215 DOI: 10.1007/s12274-022-4093-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 12/17/2021] [Accepted: 12/21/2021] [Indexed: 06/15/2023]
Abstract
UNLABELLED Self-cleaning is the key factor that makes superhydrophobic nanostructured materials have wide applications. The self-cleaning effect, however, strongly depends on formations and movement of water droplets on superhydrophobic nanostructured surfaces, which is greatly restricted at low humidity (< 7.6 g·kg-1). Therefore, we propose a self-cleaning method at low humidity in which the pollution is electro-aggregated and driven in the electric field to achieve the aggregation and cleaning large areas. The cleaning efficiency of this method is much higher than that of water droplet roll-off, and will not produce "pollution bands". A simplified numerical model describing pollution movements is presented. Simulation results are consistent with experimental results. The proposed method realizes the self-cleaning of superhydrophobic nanostructured surfaces above dew point curve for the first time, which extends applications of superhydrophobic nanostructured materials in low humidity, and is expected to solve self-cleaning problems of outdoor objects in low humidity areas (< 5.0 g·kg-1). ELECTRONIC SUPPLEMENTARY MATERIAL Supplementary material (experimental procedures, computational details, modeling process, supplementary figures, tables, and videos) is available in the online version of this article at 10.1007/s12274-022-4093-0.
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Affiliation(s)
- Yijie Liu
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Yujun Guo
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Xueqin Zhang
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Guoqiang Gao
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Chaoqun Shi
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Guizao Huang
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
| | - Pengli Li
- Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai, 200240 China
| | - Qi Kang
- Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai, 200240 China
| | - Xingyi Huang
- Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai, 200240 China
| | - Guangning Wu
- College of Electrical Engineering, Southwest Jiaotong University, Chengdu, 611756 China
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18
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Smith JL, Tran N, Song T, Liang D, Qian M. Robust bulk micro-nano hierarchical copper structures possessing exceptional bactericidal efficacy. Biomaterials 2021; 280:121271. [PMID: 34864450 DOI: 10.1016/j.biomaterials.2021.121271] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 11/01/2021] [Accepted: 11/22/2021] [Indexed: 12/29/2022]
Abstract
Conventional copper (Cu) metal surfaces are well recognized for their bactericidal properties. However, their slow bacteria-killing potency has historically excluded them as a rapid bactericidal material. We report the development of a robust bulk superhydrophilic micro-nano hierarchical Cu structure that possesses exceptional bactericidal efficacy. It resulted in a 4.41 log10 reduction (>99.99%) of the deadly Staphylococcus aureus (S. aureus) bacteria within 2 min vs. a 1.49 log10 reduction (96.75%) after 240 min on common Cu surfaces. The adhered cells exhibited extensive blebbing, loss of structural integrity and leakage of vital intracellular material, demonstrating the rapid efficacy of the micro-nano Cu structure in destructing bacteria membrane integrity. The mechanism was attributed to the synergistic degradation of the cell envelope through enhanced release and therefore uptake of the cytotoxic Cu ions and the adhesion-driven mechanical strain due to its rapid ultimate superhydrophilicity (contact angle drops to 0° in 0.18 s). The scalable fabrication of this micro-nano Cu structure was enabled by integrating bespoke precursor alloy design with microstructure preconditioning for dealloying and demonstrated on 2000 mm2 Cu surfaces. This development paves the way to the practical exploitation of Cu as a low-cost antibiotic-free fast bactericidal material.
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Affiliation(s)
- J L Smith
- RMIT University, School of Engineering, Melbourne, Victoria, 3000, Australia; CSIRO, Manufacturing, Clayton, Victoria, 3168, Australia
| | - N Tran
- RMIT University, School of Science, Melbourne, Victoria, 3000, Australia
| | - T Song
- RMIT University, School of Engineering, Melbourne, Victoria, 3000, Australia
| | - D Liang
- CSIRO, Manufacturing, Clayton, Victoria, 3168, Australia
| | - M Qian
- RMIT University, School of Engineering, Melbourne, Victoria, 3000, Australia.
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19
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Zhang B, Xu W, Xia DH, Fan X, Duan J, Lu Y. Comparison Study of Self-Cleaning, Anti-Icing, and Durable Corrosion Resistance of Superhydrophobic and Lubricant-Infused Ultraslippery Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11061-11071. [PMID: 34492186 DOI: 10.1021/acs.langmuir.1c01684] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Endowing metallic surfaces with special wettability and unique interfacial contacts broadens their wide application fields. Herein, superhydrophobic and lubricant-infused ultraslippery surfaces were achieved through chemical etching, low surface energy molecule grafting, and lubricant infusion. Systematic comparison studies of the surface wettability, self-cleaning, anti-icing, anticorrosion behaviors, and mechanical durability were carried out to reveal the functional differences and mechanisms. Both superhydrophobic and ultraslippery surfaces exhibit a distinct decrease in ice adhesion strength and a remarkable increase in charge-transfer resistance, demonstrating significantly improved ice overdelay and corrosion-resisting performance. Most notably, given the existence of a stable, defect-free, and inert lubricant-infused layer, the lubricant-infused ultraslippery surfaces possess superior mechanical robustness and long-term corrosion resistance, which provides better application potential under challenging service environments.
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Affiliation(s)
- Binbin Zhang
- CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
| | - Weichen Xu
- CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Da-Hai Xia
- Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Xiaoqiang Fan
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education China, Southwest Jiaotong University, Chengdu 610031, China
| | - Jizhou Duan
- CAS Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Yao Lu
- Department of Chemistry, School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, U.K
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20
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Dhyani A, Wang J, Halvey AK, Macdonald B, Mehta G, Tuteja A. Design and applications of surfaces that control the accretion of matter. Science 2021; 373:373/6552/eaba5010. [PMID: 34437123 DOI: 10.1126/science.aba5010] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Surfaces that provide control over liquid, solid, or vapor accretion provide an evolutionary advantage to numerous plants, insects, and animals. Synthetic surfaces inspired by these natural surfaces can have a substantial impact on diverse commercial applications. Engineered liquid and solid repellent surfaces are often designed to impart control over a single state of matter, phase, or fouling length scale. However, surfaces used in diverse real-world applications need to effectively control the accrual of matter across multiple phases and fouling length scales. We discuss the surface design strategies aimed at controlling the accretion of different states of matter, particularly those that work across multiple length scales and different foulants. We also highlight notable applications, as well as challenges associated with these designer surfaces' scale-up and commercialization.
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Affiliation(s)
- Abhishek Dhyani
- Macromolecular Science and Engineering, University of Michigan-Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan-Ann Arbor, MI, USA
| | - Jing Wang
- Department of Mechanical Engineering, University of Michigan-Ann Arbor, MI, USA
| | - Alex Kate Halvey
- Biointerfaces Institute, University of Michigan-Ann Arbor, MI, USA.,Department of Materials Science and Engineering, University of Michigan-Ann Arbor, MI, USA
| | - Brian Macdonald
- Biointerfaces Institute, University of Michigan-Ann Arbor, MI, USA.,Department of Materials Science and Engineering, University of Michigan-Ann Arbor, MI, USA
| | - Geeta Mehta
- Macromolecular Science and Engineering, University of Michigan-Ann Arbor, MI, USA.,Department of Materials Science and Engineering, University of Michigan-Ann Arbor, MI, USA.,Department of Biomedical Engineering, University of Michigan-Ann Arbor, MI, USA
| | - Anish Tuteja
- Macromolecular Science and Engineering, University of Michigan-Ann Arbor, MI, USA. .,Biointerfaces Institute, University of Michigan-Ann Arbor, MI, USA.,Department of Materials Science and Engineering, University of Michigan-Ann Arbor, MI, USA.,Department of Chemical Engineering, University of Michigan-Ann Arbor, MI, USA
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21
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Baba S, Sawada K, Tanaka K, Okamoto A. Condensation Behavior of Hierarchical Nano/Microstructured Surfaces Inspired by Euphorbia myrsinites. ACS APPLIED MATERIALS & INTERFACES 2021; 13:32332-32342. [PMID: 34190527 DOI: 10.1021/acsami.1c01400] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In nature, many extant species exhibit functionalized surface structures during evolution. In particular, wettability affects the functionalization of the surface, and nano/microstructures have been found to enable functions, such as droplet jumping, thereby making self-cleaning, antifog, antibacterial, and antireflection surfaces. Important efforts are underway to understand the surface structure of plant leaves and establish rational design tools for the development of new engineering materials. In this study, we focused on the hierarchical nano/microstructure of the leaves of Euphorbia myrsinites (hereinafter, E. myrsinites), which has a hierarchical shape with microsized papillae, covered with nanosized protruding wax, and observed the condensation behavior on the leaf surface. Si is vertically etched via reactive ion etching (RIE) to artificially mimic the hierarchical nano/microstructures on the leaves of E. myrsinites. We made four types of artificial hierarchical structures, with micropillars having pillar diameters of 5.6 and 16 μm (pillar spacing of 20 and 40 μm, respectively) and heights of 6.5 and 19.5 μm, and nanopillars formed on the surface. The optical observation with a microscope revealed a very high density of condensed droplets on the artificial surface and a stable jumping behavior of droplets of 10 μm or more. Furthermore, in the samples with a micropillar diameter of 5.6 μm and a micropillar height of 19.5 μm, the droplets that had jumped and fallen thereupon bounced off, thereby preventing reattachment. As a result, no droplets of 35 μm or more could exist even after 10 min. In addition, it was clear that a small underlying droplet of less than 10 μm was generated at the bottom of the relatively large secondary droplet existing on the large micropillar of 16 μm, and a frequent coalescence of the droplets occurred. This study revealed the phenomenon of condensation on the surface of plants as well as made it possible to improve the heat exchange process by significantly promoting the heat transfer of condensation using artificial surfaces.
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Affiliation(s)
- Soumei Baba
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan
| | - Kenichiro Sawada
- Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-0233, Japan
| | - Kohsuke Tanaka
- Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba-shi, Ibaraki 305-8505, Japan
| | - Atsushi Okamoto
- Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba-shi, Ibaraki 305-8505, Japan
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22
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Liu C, Zhao M, Zheng Y, Lu D, Song L. Enhancement and Guidance of Coalescence-Induced Jumping of Droplets on Superhydrophobic Surfaces with a U-Groove. ACS APPLIED MATERIALS & INTERFACES 2021; 13:32542-32554. [PMID: 34180653 DOI: 10.1021/acsami.1c08142] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Coalescence-induced droplet jumping has received considerable attention owing to its potential to enhance performance in various applications. However, the energy conversion efficiency of droplet coalescence jumping is very low and the jumping direction is uncontrollable, which vastly limits the application of droplet coalescence jumping. In this work, we used superhydrophobic surfaces with a U-groove to experimentally achieve a high dimensionless jumping velocity Vj* ≈ 0.70, with an energy conversion efficiency η ≈ 43%, about a 900% increase in energy conversion efficiency compared to droplet coalescence jumping on flat superhydrophobic surfaces. Numerical simulation and experimental data indicated that a higher jumping velocity arises from the redirection of in-plane velocity vectors to out-of-plane velocity vectors, which is a joint effect resulting from the redirection of velocity vectors in the coalescence direction and the redirection of velocity vectors of the liquid bridge by limiting maximum deformation of the liquid bridge. Furthermore, the jumping direction of merged droplets could be easily controlled ranging from 17 to 90° by adjusting the opening direction of the U-groove, with a jumping velocity Vj* ≥ 0.70. When the opening direction is 60°, the jumping direction shows a deviation as low as 17° from the horizontal surface with a jumping velocity Vj* ≈ 0.73 and corresponding energy conversion efficiency η ≈ 46%. This work not only improves jumping velocity and energy conversion efficiency but also demonstrates the effect of the U-groove on coalescence dynamics and demonstrates a method to further control the droplet jumping direction for enhanced performance in applications.
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Affiliation(s)
- Chuntian Liu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Meirong Zhao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yelong Zheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Dunqiang Lu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Le Song
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
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23
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Xie H, Xu WH, Jia SH, Wu T. Tunable fabrication of biomimetic polypropylene nanopillars with robust superhydrophobicity and antireflectivity. NANOTECHNOLOGY 2021; 32:395301. [PMID: 34126610 DOI: 10.1088/1361-6528/ac0b18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 06/14/2021] [Indexed: 06/12/2023]
Abstract
The fine nanopillars on the natural cicada wing, which exhibits outstanding superhydrophobicity and anti-reflectivity, are carefully observed and analyzed. Here, a promising strategy by combining anodic aluminum oxide template and hot embossing is proposed for rapidly and efficiently mimicking the orderly and densely arranged nanopillars on the cicada wing surface to polypropylene (PP) surfaces. By adjusting the compression pressure, the nanostructures on the PP replica surface gradually evolve from nanoprotrusion-like features to nanopillar-like features so that a gradient wetting behavior from hydrophilicity to hydrophobicity and further to superhydrophobicity appears on the PP replica surfaces. Specifically, the biomimetic PP replica surface exhibits a contact angle of 159 ± 3° and a rolling angle of 8 ± 3° at a compression pressure of 15 MPa. Moreover, the biomimetic PP replica surface can stabilize its superhydrophobic state under a 1.96 kPa external pressure during the dynamic droplet impact. Besides robust dynamic superhydrophobicity, the biomimetic PP replica surface also demonstrated excellent anti-reflectivity because of the gradually changed effective refractive index. Therefore, the biomimetic PP replica inherits both the superhydrophobicity and anti-reflectivity of the natural cicada wing, which makes the products can effectively reduce the external damage when applied to agricultural films, dustproof films, and packaging materials.
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Affiliation(s)
- Heng Xie
- School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan, Hubei, 430074, People's Republic of China
| | - Wen-Hua Xu
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou, Guangdong, 510640, People's Republic of China
| | - Shun-Heng Jia
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou, Guangdong, 510640, People's Republic of China
| | - Ting Wu
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou, Guangdong, 510640, People's Republic of China
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24
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Liu C, Zhao M, Zheng Y, Cheng L, Zhang J, Tee CATH. Coalescence-Induced Droplet Jumping. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:983-1000. [PMID: 33443436 DOI: 10.1021/acs.langmuir.0c02758] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
When two or more droplets coalesce on a superhydrophobic surface, the merged droplet can jump spontaneously from the surface without requiring any external energy. This phenomenon is defined as coalescence-induced droplet jumping and has received significant attention due to its potential applications in a variety of self-cleaning, anti-icing, antifrosting, and condensation heat-transfer enhancement uses. This article reviews the research and applications of coalescence-induced droplet jumping behavior in recent years, including the influence of droplet parameters on coalescence-induced droplet jumping, such as the droplet size, number, and initial velocity, to name a few. The main structure types and influence mechanism of the superhydrophobic substrates for coalescence-induced droplet jumping are described, and the potential application areas of coalescence-induced droplet jumping are summarized and forecasted.
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Affiliation(s)
- Chuntian Liu
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Meirong Zhao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yelong Zheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Luya Cheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Jiale Zhang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Clarence Augustine T H Tee
- Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
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25
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Šigutová H, Šigut M, Kovalev A, Gorb SN. Wing wettability gradient in a damselfly Lestes sponsa (Odonata: Lestidae) reflects the submergence behaviour during underwater oviposition. ROYAL SOCIETY OPEN SCIENCE 2020; 7:201258. [PMID: 33489275 PMCID: PMC7813233 DOI: 10.1098/rsos.201258] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/29/2020] [Indexed: 06/12/2023]
Abstract
The phenomenon of hydrophobicity of insect cuticles has received great attention from technical fields due to its wide applicability to industry or medicine. However, in an ecological/evolutionary context such studies remain scarce. We measured spatial differences in wing wettability in Lestes sponsa (Odonata: Lestidae), a damselfly species that can submerge during oviposition, and discussed the possible functional significance. Using dynamic contact angle (CA) measurements together with scanning electron microscopy (SEM), we investigated differences in wettability among distal, middle and proximal wing regions, and in surface nanostructures potentially responsible for observed differences. As we moved from distal towards more proximal parts, mean values of advancing and receding CAs gradually increased from 104° to 149°, and from 67° to 123°, respectively, indicating that wing tips were significantly less hydrophobic than more proximal parts. Moreover, values of CA hysteresis for the respective wing parts decreased from 38° to 26°, suggesting greater instability of the structure of the wing tips. Accordingly, compared with more proximal parts, SEM revealed higher damage of the wax nanostructures at the distal region. The observed wettability gradient is well explained by the submergence behaviour of L. sponsa during underwater oviposition. Our study thus proposed the existence of species-dependent hydrophobicity gradient on odonate wings caused by different ovipositional strategies.
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Affiliation(s)
- Hana Šigutová
- Department of Biology and Ecology/ENC, Faculty of Science, University of Ostrava, Chittussiho 10, 71000 Ostrava, Czech Republic
| | - Martin Šigut
- Department of Biology and Ecology/ENC, Faculty of Science, University of Ostrava, Chittussiho 10, 71000 Ostrava, Czech Republic
| | - Alexander Kovalev
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1–9, 24118 Kiel, Germany
| | - Stanislav N. Gorb
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1–9, 24118 Kiel, Germany
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26
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Román-Kustas J, Hoffman JB, Alonso D, Reed JH, Gonsalves AE, Oh J, Hong S, Jo KD, Dana CE, Alleyne M, Miljkovic N, Cropek DM. Analysis of cicada wing surface constituents by comprehensive multidimensional gas chromatography for species differentiation. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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27
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Yan X, Qin Y, Chen F, Zhao G, Sett S, Hoque MJ, Rabbi KF, Zhang X, Wang Z, Li L, Chen F, Feng J, Miljkovic N. Laplace Pressure Driven Single-Droplet Jumping on Structured Surfaces. ACS NANO 2020; 14:12796-12809. [PMID: 33052666 DOI: 10.1021/acsnano.0c03487] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Droplet transport on, and shedding from, surfaces is ubiquitous in nature and is a key phenomenon governing applications including biofluidics, self-cleaning, anti-icing, water harvesting, and electronics thermal management. Conventional methods to achieve spontaneous droplet shedding enabled by surface-droplet interactions suffer from low droplet transport velocities and energy conversion efficiencies. Here, by spatially confining the growing droplet and enabling relaxation via rationally designed grooves, we achieve single-droplet jumping of micrometer and millimeter droplets with dimensionless jumping velocities v* approaching 0.95, significantly higher than conventional passive approaches such as coalescence-induced droplet jumping (v* ≈ 0.2-0.3). The mechanisms governing single-droplet jumping are elucidated through the study of groove geometry and local pinning, providing guidelines for optimized surface design. We show that rational design of grooves enables flexible control of droplet-jumping velocity, direction, and size via tailoring of local pinning and Laplace pressure differences. We successfully exploit this previously unobserved mechanism as a means for rapid removal of droplets during steam condensation. Our study demonstrates a passive method for fast, efficient, directional, and surface-pinning-tolerant transport and shedding of droplets having micrometer to millimeter length scales.
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Affiliation(s)
- Xiao Yan
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Yimeng Qin
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Feipeng Chen
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Guanlei Zhao
- Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Soumyadip Sett
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Muhammad Jahidul Hoque
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kazi Fazle Rabbi
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Xueqian Zhang
- Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Zi Wang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Longnan Li
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Feng Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Jie Feng
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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28
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Oh J, Hoffman JB, Hong S, Jo KD, Román-Kustas J, Reed JH, Dana CE, Cropek DM, Alleyne M, Miljkovic N. Dissolvable Template Nanoimprint Lithography: A Facile and Versatile Nanoscale Replication Technique. NANO LETTERS 2020; 20:6989-6997. [PMID: 32790414 DOI: 10.1021/acs.nanolett.0c01547] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nanoimprinting lithography (NIL) is a next-generation nanofabrication method, capable of replicating nanostructures from original master surfaces. Here, we develop highly scalable, simple, and nondestructive NIL using a dissolvable template. Termed dissolvable template nanoimprinting lithography (DT-NIL), our method utilizes an economic thermoplastic resin to fabricate nanoimprinting templates, which can be easily dissolved in simple organic solvents. We used the DT-NIL method to replicate cicada wings which have surface nanofeatures of ∼100 nm in height. The master, template, and replica surfaces showed a >∼94% similarity based on the measured diameter and height of the nanofeatures. The versatility of DT-NIL was also demonstrated with the replication of re-entrant, multiscale, and hierarchical features on fly wings, as well as hard silicon wafer-based artificial nanostructures. The DT-NIL method can be performed under ambient conditions with inexpensive materials and equipment. Our work opens the door to opportunities for economical and high-throughput nanofabrication processes.
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Affiliation(s)
- Junho Oh
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Mechanical Engineering, University College London, London, WC1E 7JE, United Kingdom
| | - Jacob B Hoffman
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Sungmin Hong
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Kyoo D Jo
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Jessica Román-Kustas
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
- Materials Reliability, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Julian H Reed
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Catherine E Dana
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Donald M Cropek
- Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, Champaign, Illinois 61822, United States
| | - Marianne Alleyne
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Beckman Institute of Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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29
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Lv L, Zhao W, Zhong X, Fu H. Fabrication of Magnetically Inorganic/Organic Superhydrophobic Fabrics and Their Applications. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45296-45305. [PMID: 32931244 DOI: 10.1021/acsami.0c13229] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In order to solve the problem caused by oil spills and organic solvent contamination, novel magnetically inorganic/organic superhydrophobic fabrics are fabricated via a facile method. Cotton fabrics are immersed in a mixture of functionalized Co0.2Mg0.8Fe2O4 (FCMFO) nanoparticles, vinyl-terminated polydimethylsiloxane (VPDMS), trimethylolpropane triacrylate, and 2-hydroxy-2-methylpropiophenone before UV irradiation for 100 s to obtain the multifunctional superhydrophobic fabrics with magnetic property. The coated fabrics show excellent superhydrophobicity, and the water contact angle is 157.1° when the mass ratio of FCMFO nanoparticles to VPDMS is 0.3. These superhydrophobic fabrics have high oil/water separation efficiency (98.7% for dichloromethane/water) and high oil flux (71,506 L·m-2·h-1 for dichloromethane/water). Even after 20 separation cycles, oil/water separation efficiency and oil flux maintain 96.4% and 64,012 L·m-2·h-1, respectively. Furthermore, the magnetic property of these superhydrophobic fabrics could be used in the separation of oil from water. Moreover, the superhydrophobic fabrics possess exceptional self-cleaning performance, mechanical durability, chemical stability, and flame retardancy. These multifunctional superhydrophobic fabrics are potential for wide applications.
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Affiliation(s)
- Lizhang Lv
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Wenjie Zhao
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Ximing Zhong
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P. R. China
| | - Heqing Fu
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
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30
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Wang L, Wang R, Wang J, Wong TS. Compact nanoscale textures reduce contact time of bouncing droplets. SCIENCE ADVANCES 2020; 6:eabb2307. [PMID: 32832639 PMCID: PMC7439615 DOI: 10.1126/sciadv.abb2307] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 06/04/2020] [Indexed: 05/25/2023]
Abstract
Many natural surfaces are capable of rapidly shedding water droplets-a phenomenon that has been attributed to the presence of low solid fraction textures (Φs ~ 0.01). However, recent observations revealed the presence of unusually high solid fraction nanoscale textures (Φs ~ 0.25 to 0.64) on water-repellent insect surfaces, which cannot be explained by existing wetting theories. Here, we show that the contact time of bouncing droplets on high solid fraction surfaces can be reduced by reducing the texture size to ~100 nm. We demonstrated that the texture size-dependent contact time reduction could be attributed to the dominance of line tension on nanotextures and that compact arrangement of nanotextures is essential to withstand the impact pressure of raindrops. Our findings illustrate a potential survival strategy of insects to rapidly shed impacting raindrops, and suggest a previously unidentified design principle to engineering robust water-repellent materials for applications including miniaturized drones.
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Affiliation(s)
- Lin Wang
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
- Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
| | - Ruoxi Wang
- Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
- Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Jing Wang
- Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
- Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Tak-Sing Wong
- Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
- Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802, USA
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA
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31
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Xie H, Xu W, Wu T. Bioinspired preparation of regular dual‐level micropillars on polypropylene surfaces with robust hydrophobicity inspired by green bristlegrass leaves. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4786] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Heng Xie
- Key Laboratory of Polymer Processing EngineeringMinistry of Education, South China University of Technology Guangzhou China
- College of EngineeringSouth China Agricultural University Guangzhou China
| | - Wen‐hua Xu
- Key Laboratory of Polymer Processing EngineeringMinistry of Education, South China University of Technology Guangzhou China
| | - Ting Wu
- Key Laboratory of Polymer Processing EngineeringMinistry of Education, South China University of Technology Guangzhou China
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32
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Reed JH, Gonsalves AE, Román JK, Oh J, Cha H, Dana CE, Toc M, Hong S, Hoffman JB, Andrade JE, Jo KD, Alleyne M, Miljkovic N, Cropek DM. Ultrascalable Multifunctional Nanoengineered Copper and Aluminum for Antiadhesion and Bactericidal Applications. ACS APPLIED BIO MATERIALS 2019; 2:2726-2737. [DOI: 10.1021/acsabm.8b00765] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Julian H. Reed
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Andrew E. Gonsalves
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Jessica K. Román
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Junho Oh
- Department of Mechanical Science and Engineering, University of Illinois at Urbana−Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
| | - Hyeongyun Cha
- Department of Mechanical Science and Engineering, University of Illinois at Urbana−Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
| | - Catherine E. Dana
- Department of Entomology, University of Illinois at Urbana−Champaign, 505 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Marco Toc
- Department of Food Science and Human Nutrition, University of Illinois at Urbana−Champaign, 905 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Sungmin Hong
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Jacob B. Hoffman
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Juan E. Andrade
- Department of Food Science and Human Nutrition, University of Illinois at Urbana−Champaign, 905 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Kyoo D. Jo
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
| | - Marianne Alleyne
- Department of Entomology, University of Illinois at Urbana−Champaign, 505 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois at Urbana−Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois at Urbana−Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois at Urbana−Champaign, 104 South Goodwin Avenue, MC-230, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
| | - Donald M. Cropek
- U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), 2902 Newmark Drive, Champaign, Illinois 61822, United States
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33
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Hasan J, Roy A, Chatterjee K, Yarlagadda PKDV. Mimicking Insect Wings: The Roadmap to Bioinspiration. ACS Biomater Sci Eng 2019; 5:3139-3160. [DOI: 10.1021/acsbiomaterials.9b00217] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jafar Hasan
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia
| | - Anindo Roy
- Department of Materials Engineering, Indian Institute of Science, C. V. Raman Avenue, Bangalore 560 012, India
| | - Kaushik Chatterjee
- Department of Materials Engineering, Indian Institute of Science, C. V. Raman Avenue, Bangalore 560 012, India
| | - Prasad K. D. V. Yarlagadda
- Science and Engineering Faculty, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia
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34
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Wan Q, Li H, Zhang S, Wang C, Su S, Long S, Pan B. Combination of active behaviors and passive structures contributes to the cleanliness of housefly wing surfaces: A new insight for the design of cleaning materials. Colloids Surf B Biointerfaces 2019; 180:473-480. [PMID: 31102851 DOI: 10.1016/j.colsurfb.2019.05.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 04/07/2019] [Accepted: 05/07/2019] [Indexed: 10/26/2022]
Abstract
Evolutionary pressure has pushed many extant plants and animals to develop micro/nanostructures on their surfaces to keep them clean. These structures have become ideal models for bio-inspired design. Although microstructures on biological surfaces have been widely studied, little attention has been paid to the combined role of microstructures and animal's active cleaning behaviors in keeping their surfaces clean. In this study, we explored the relationship between these micro/nanostructures and wettability as well as the role of the housefly cleaning behaviors in keeping their wings clean. Hierarchical structures consisting of microscale macrotrichias with nanoscale grooves on the wings were observed under scanning electron microscope. The wings were hydrophobic (CA = 133.3°) but with high adhesion to water (CAH = 87.5°), indicating that they were non-self-cleaning surfaces. Macroscale droplets standing on the wings could be best described as being in a transitional wetting state between Wenzel and Cassie-Baxter states due to the presence of the nanoscale grooves, which increased the resistance to water penetration. The hydrophobicity decreased (CA = 109.9°) when the nanostructures were removed by coating the wings with a thick layer of polydimethylsiloxane (PDMS). The houseflies could highly efficiently remove the microscale droplets atop the macrotrichias, and reduce bacterial contamination on their wings through grooming and flutter activities. These active cleaning behaviors could offset the absence of self-cleaning properties and play a key role in keeping the wings clean. The results indicate that housefly wings could be used as a template for the design of special functional surfaces. The present findings not only improve our understanding of the wettability and cleaning properties of natural surfaces, but also provide important insights into the design of bio-inspired materials.
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Affiliation(s)
- Qiang Wan
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Hao Li
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Shudong Zhang
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Chuanwen Wang
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Shanchun Su
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Shaojun Long
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China
| | - Baoliang Pan
- College of Veterinary Medicine, China Agricultural University, Hai Dian District, Beijing, 100193, China.
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35
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Yan X, Zhang L, Sett S, Feng L, Zhao C, Huang Z, Vahabi H, Kota AK, Chen F, Miljkovic N. Droplet Jumping: Effects of Droplet Size, Surface Structure, Pinning, and Liquid Properties. ACS NANO 2019; 13:1309-1323. [PMID: 30624899 DOI: 10.1021/acsnano.8b06677] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Coalescence-induced droplet jumping has the potential to enhance the efficiency of a plethora of applications. Although binary droplet jumping is quantitatively understood from energy and hydrodynamic perspectives, multiple aspects that affect jumping behavior, including droplet size mismatch, droplet-surface interaction, and condensate thermophysical properties, remain poorly understood. Here, we develop a visualization technique utilizing microdroplet dispensing to study droplet jumping dynamics on nanostructured superhydrophobic, hierarchical superhydrophobic, and hierarchical biphilic surfaces. We show that on the nanostructured superhydrophobic surface the jumping velocity follows inertial-capillary scaling with a dimensionless velocity of 0.26 and a jumping direction perpendicular to the substrate. A droplet mismatch phase diagram was developed showing that jumping is possible for droplet size mismatch up to 70%. On the hierarchical superhydrophobic surface, jumping behavior was dependent on the ratio between the droplet radius Ri and surface structure length scale L. For small droplets ( Ri ≤ 5 L), the jumping velocity was highly scattered, with a deviation of the jumping direction from the substrate normal as high as 80°. Surface structure length scale effects were shown to vanish for large droplets ( Ri > 5 L). On the hierarchical biphilic surface, similar but more significant scattering of the jumping velocity and direction was observed. Droplet-size-dependent surface adhesion and pinning-mediated droplet rotation were responsible for the reduced jumping velocity and scattered jumping direction. Furthermore, droplet jumping studies of liquids with surface tensions as low as 38 mN/m were performed, further confirming the validity of inertial-capillary scaling for varying condensate fluids. Our work not only demonstrates a powerful platform to study droplet-droplet and droplet-surface interactions but provides insights into the role of fluid-substrate coupling as well as condensate properties during droplet jumping.
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Affiliation(s)
- Xiao Yan
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
- Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing , 100084 , China
| | - Leicheng Zhang
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Soumyadip Sett
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Lezhou Feng
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Chongyan Zhao
- Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing , 100084 , China
| | - Zhiyong Huang
- Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing , 100084 , China
| | - Hamed Vahabi
- Department of Mechanical Engineering , Colorado State University , Fort Collins , Colorado 80523 , United States
| | - Arun K Kota
- Department of Mechanical Engineering , Colorado State University , Fort Collins , Colorado 80523 , United States
- School of Biomedical Engineering , Colorado State University , Fort Collins , Colorado 80523 , United States
- Department of Chemical Engineering , Colorado State University , Fort Collins , Colorado 80523 , United States
| | - Feng Chen
- Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing , 100084 , China
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
- Department of Electrical and Computer Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
- Frederick Seitz Materials Research Laboratory , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER) , Kyushu University , 744 Moto-oka , Nishi-ku, Fukuoka , 819-0395 , Japan
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36
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Rong L, Tang C, Wang D, Li B, Tan F, Wang Y, Shi X. Probe position correction based on overlapped object wavefront cross-correlation for continuous-wave terahertz ptychography. OPTICS EXPRESS 2019; 27:938-950. [PMID: 30696172 DOI: 10.1364/oe.27.000938] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 01/08/2019] [Indexed: 06/09/2023]
Abstract
Continuous-wave terahertz ptychography is a promising large field-of-view lensless terahertz phase imaging method. Inaccurate probe positions would severely degrade the reconstruction quality, as compared to other spectral bands. In this paper, we propose a probe position correction method based on cross-correlation registration on overlapped regions of the object wavefront for terahertz ptychography. The translation errors could be minimized in the order of 0.01 pixels. The simulation results suggest good computational efficiency, correction, and reconstruction accuracy. We perform continuous-wave terahertz ptychography on a cicada's forewing. The subcosta and the first radius vein are distinguished after position correction. The probe position distribution reveals that the tilt angle between the object plane and the recording plane is 0.26°.
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37
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Zhao N, Li H, Tian C, Xie Y, Feng Z, Wang Z, Yan X, Wang W, Yu H. Bioscaffold arrays decorated with Ag nanoparticles as a SERS substrate for direct detection of melamine in infant formula. RSC Adv 2019; 9:21771-21776. [PMID: 35518849 PMCID: PMC9066452 DOI: 10.1039/c9ra01862j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 07/09/2019] [Indexed: 01/05/2023] Open
Abstract
Three-dimensional (3D) plasmonic structures have been intensively investigated as high performance surface enhanced Raman scattering (SERS) substrates. Here, we demonstrate a 3D biomimetic SERS substrate prepared by deposition of silver nanoparticles (Ag NPs) on the bioscaffold arrays of cicada wings using laser molecular beam epitaxy. This deposition method can offer a large number of nanoparticles with average diameter of ∼10 nm and nanogaps of sub-10 nm on the surface of chitin nanopillars to generate a high density of hotspots. The prepared 3D Ag/cicada SERS substrate shows a limit of detection (LOD) for Rhodamine 6G as low as 10−7 M, high enhancement factor of 1.09 × 105, and excellent signal uniformity of 6.8%. Moreover, the molecular fingerprints of melamine in infant formula can be directly extracted with an LOD as low as 10 mg L−1, without the need for functional modification. The prepared SERS-active substrate, due to its low cost, high-throughput, and good detection performance, can be widely used in applications such as food safety and environmental monitoring. Three-dimensional (3D) plasmonic structures have been intensively investigated as high performance surface enhanced Raman scattering (SERS) substrates.![]()
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Affiliation(s)
- Nan Zhao
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Hefu Li
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Cunwei Tian
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Yanru Xie
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Zhenbao Feng
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Zongliang Wang
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Xunling Yan
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Wenjun Wang
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
| | - Huishan Yu
- School of Physics Science and Information Technology
- Shandong Key Laboratory of Optical Communication Science and Technology
- Liaocheng University
- Liaocheng 252059
- China
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38
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Cheeseman S, Owen S, Truong VK, Meyer D, Ng SH, Vongsvivut J, Linklater D, Tobin MJ, Werner M, Baulin VA, Luque P, Marchant R, Juodkazis S, Crawford RJ, Ivanova EP. Pillars of Life: Is There a Relationship between Lifestyle Factors and the Surface Characteristics of Dragonfly Wings? ACS OMEGA 2018; 3:6039-6046. [PMID: 30221231 PMCID: PMC6130794 DOI: 10.1021/acsomega.8b00776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 05/07/2018] [Indexed: 05/05/2023]
Abstract
Dragonfly wings are of great interest to researchers investigating biomimetic designs for antiwetting and antibacterial surfaces. The waxy epicuticular layer on the membrane of dragonfly wings possesses a unique surface nanoarchitecture that consists of irregular arrays of nanoscale pillars. This architecture confers superhydrophobic, self-cleaning, antiwetting, and antibiofouling behaviors. There is some evidence available that suggests that lifestyle factors may have influenced the evolution of the wing nanostructures and, therefore, the resulting properties of the wings; however, it appears that no systematic studies have been performed that have compared the wing surface features across a range of dragonfly species. Here, we provided a comparison of relevant wing surface characteristics, including chemical composition, wettability, and nanoarchitecture, of seven species of dragonfly from three families including Libellulidae, Aeshnidae, and Gomphidae. The characteristic nanopillar arrays were found to be present, and the chemical composition and the resultant wing surface superhydrophobicity were found to be well-conserved across all of the species studied. However, subtle differences were observed between the height, width, and density of nanofeatures and water droplet bouncing behavior on the wing surfaces. The results of this research will contribute to an understanding of the physical and chemical surface features that are optimal for the design of antiwetting and antibacterial surfaces.
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Affiliation(s)
- Samuel Cheeseman
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Stephanie Owen
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Vi Khanh Truong
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Denny Meyer
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Soon Hock Ng
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Jitraporn Vongsvivut
- Infrared
Microspectroscopy Beamline, Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Denver Linklater
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Mark J. Tobin
- Infrared
Microspectroscopy Beamline, Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Marco Werner
- Departament
d’Enginyeria Quimica, Universitat
Rovira i Virgili, 26 Av. dels Paisos Catalans, 43007 Tarragona, Spain
| | - Vladimir A. Baulin
- Departament
d’Enginyeria Quimica, Universitat
Rovira i Virgili, 26 Av. dels Paisos Catalans, 43007 Tarragona, Spain
| | - Pere Luque
- Museu
de les Terres de l’Ebre, Gran Capità, 34, 43870 Amposta, Spain
| | - Richard Marchant
- Museum Victoria, P.O. Box 666, Melbourne, Victoria 3001, Australia
| | - Saulius Juodkazis
- School
of Science, Faculty of Science, Engineering and Technology, and School of Health
Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Russell J. Crawford
- School
of Science, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Elena P. Ivanova
- School
of Science, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
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39
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Spatially resolved chemical analysis of cicada wings using laser-ablation electrospray ionization (LAESI) imaging mass spectrometry (IMS). Anal Bioanal Chem 2018; 410:1911-1921. [DOI: 10.1007/s00216-018-0855-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/21/2017] [Accepted: 01/04/2018] [Indexed: 01/27/2023]
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40
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Zhang P, Maeda Y, Lv F, Takata Y, Orejon D. Enhanced Coalescence-Induced Droplet-Jumping on Nanostructured Superhydrophobic Surfaces in the Absence of Microstructures. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35391-35403. [PMID: 28925681 DOI: 10.1021/acsami.7b09681] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Superhydrophobic surfaces are receiving increasing attention due to the enhanced condensation heat transfer, self-cleaning, and anti-icing properties by easing droplet self-removal. Despite the extensive research carried out on this topic, the presence or absence of microstructures on droplet adhesion during condensation has not been fully addressed yet. In this work we, therefore, study the condensation behavior on engineered superhydrophobic copper oxide surfaces with different structural finishes. More specifically, we investigate the coalescence-induced droplet-jumping performance on superhydrophobic surfaces with structures varying from the micro- to the nanoscale. The different structural roughness is possible due to the specific etching parameters adopted during the facile low-cost dual-scale fabrication process. A custom-built optical microscopy setup inside a temperature and relative humidity controlled environmental chamber was used for the experimental observations. By varying the structural roughness, from the micro- to the nanoscale, important differences on the number of droplets involved in the jumps, on the frequency of the jumps, and on the size distribution of the jumping droplets were found. In the absence of microstructures, we report an enhancement of the droplet-jumping performance of small droplets with sizes in the same order of magnitude as the microstructures. Microstructures induce further droplet adhesion, act as a structural barrier for the coalescence between droplets growing on the same microstructure, and cause the droplet angular deviation from the main surface normal. As a consequence, upon coalescence, there is a decrease in the net momentum in the out-of-plane direction, and the jump does not ensue. We demonstrate that the absence of microstructures has therefore a positive impact on the coalescence-induced droplet-jumping of micrometer droplets for antifogging, anti-icing, and condensation heat transfer applications.
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Affiliation(s)
- Peng Zhang
- Institute of Refrigeration and Cryogenics, MOE Key Laboratory for Power Machinery and Engineering, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Yota Maeda
- Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Fengyong Lv
- Institute of Refrigeration and Cryogenics, MOE Key Laboratory for Power Machinery and Engineering, Shanghai Jiao Tong University , Shanghai 200240, China
| | - Yasuyuki Takata
- Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Daniel Orejon
- Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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