1
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Zhang L, Wan X, Zhou X, Cao Y, Duan H, Yan J, Li H, Lv P. Pyramid-Shaped Superhydrophobic Surfaces for Underwater Drag Reduction. ACS APPLIED MATERIALS & INTERFACES 2024; 16:44319-44327. [PMID: 39110849 DOI: 10.1021/acsami.4c09631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Superhydrophobic surfaces hold immense potential in underwater drag reduction. However, as the Reynolds number increases, the drag reduction rate decreases, and it may even lead to a drag increase. The reason lies in the collapse of the air mattress. To address this issue, this paper develops a pyramid-shaped robust superhydrophobic surface with wedged microgrooves, which exhibits a high gas fraction when immersed underwater and good ability to achieve complete spreading and recovery of the air mattress through air replenishment in the case of collapse of the air mattress. Pressure drop tests in a water tunnel confirm that with continuous air injection, the drag reduction reaches 64.8% in laminar flow conditions, substantially greater than 38.4% in the case without air injection, and can achieve 50.8% drag reduction in turbulent flow. This result highlights the potential applications of superhydrophobic surfaces with air mattress recovery for drag reduction.
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Affiliation(s)
- Liangpei Zhang
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Xia Wan
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Xu Zhou
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Yanlin Cao
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Huiling Duan
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Jiale Yan
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
| | - Hongyuan Li
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
- Laoshan Laboratory, Qingdao 266237, P. R. China
| | - Pengyu Lv
- State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
- Laoshan Laboratory, Qingdao 266237, P. R. China
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2
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Wang J, Liu Y. Self-Driven Gas Spreading on Mesh Surfaces for Regeneration of Underwater Superhydrophobicity. ACS APPLIED MATERIALS & INTERFACES 2024; 16:40231-40242. [PMID: 39034615 DOI: 10.1021/acsami.4c07843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
Underwater superhydrophobic surfaces stand as a promising frontier in technological applications such as drag reduction, antifouling, and anticorrosion. Unfortunately, the air film, known as the plastron, on these surfaces tends to be unstable. To address this problem, active approaches have been designed to preserve or restore plastrons. In this work, a self-driven gas spreading superhydrophobic mesh (SHM) surface is designed to facilitate recovery of the plastron. The immersed SHM can be "wetted" by gas, even when the plastron is removed. We demonstrate that the injected gas can spread spontaneously along the SHM over a large area, which greatly simplifies the plastron replenishment process. By incorporating a locally coated gas-producing layer, we achieve rapid in situ plastron recovery and long-term immersion stability, extending the plastron lifespan by at least 48 times. We also provide a framework for designing an SHM with suitable structural dimensions for gas spreading. Furthermore, an SHM with asymmetric structural dimensions enables unidirectional gas transport by the capillary pressure difference. This SHM surface shows excellent drag reduction properties (37.2%) and has a high slip recovery coefficient (73.4%) after plastron loss. This facile and scalable method is expected to broaden the range of potential applications involving nonwetting-related fields.
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Affiliation(s)
- Jiaming Wang
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Yuhong Liu
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
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3
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Bai J, Wang X, Zhang M, Yang Z, Zhang J. Turning Non-Sticking Surface into Sticky Surface: Correlation between Surface Topography and Contact Angle Hysteresis. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2006. [PMID: 38730813 PMCID: PMC11084899 DOI: 10.3390/ma17092006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 04/20/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024]
Abstract
We present a surface modification technique that turns CuNi foam films with a high contact angle and non-sticking property into a sticky surface. By decorating with mesh-like biaxially oriented polypropylene (BOPP) and adjusting the surface parameters, the surface exhibits water-retaining capability even when being held upside down. The wetting transition process of droplets falling on its surface were systematically studied using the finite element simulation method. It is found that the liquid filled the surface microstructure and curvy three-phase contact line. Moreover, we experimentally demonstrated that this surface can be further applied to capture underwater air bubbles.
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Affiliation(s)
- Jingyuan Bai
- School of Intelligent Manufacturing, Lishui Vocational and Technical College, Lishui 323000, China;
| | - Xuejiao Wang
- School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; (X.W.); (M.Z.)
| | - Meilin Zhang
- School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; (X.W.); (M.Z.)
| | - Zhou Yang
- Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China;
- Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province, Dalian Jiaotong University, Dalian 116028, China
| | - Jin Zhang
- Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China;
- Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province, Dalian Jiaotong University, Dalian 116028, China
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4
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Ghasemlou M, Oladzadabbasabadi N, Ivanova EP, Adhikari B, Barrow CJ. Engineered Sustainable Omniphobic Coatings to Control Liquid Spreading on Food-Contact Materials. ACS APPLIED MATERIALS & INTERFACES 2024; 16:15657-15686. [PMID: 38518221 DOI: 10.1021/acsami.4c01329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
The adhesion of sticky liquid foods to a contacting surface can cause many technical challenges. The food manufacturing sector is confronted with many critical issues that can be overcome with long-lasting and highly nonwettable coatings. Nanoengineered biomimetic surfaces with distinct wettability and tunable interfaces have elicited increasing interest for their potential use in addressing a broad variety of scientific and technological applications, such as antifogging, anti-icing, antifouling, antiadhesion, and anticorrosion. Although a large number of nature-inspired surfaces have emerged, food-safe nonwetted surfaces are still in their infancy, and numerous structural design aspects remain unexplored. This Review summarizes the latest scientific research regarding the key principles, fabrication methods, and applications of three important categories of nonwettable surfaces: superhydrophobic, liquid-infused slippery, and re-entrant structured surfaces. The Review is particularly focused on new insights into the antiwetting mechanisms of these nanopatterned structures and discovering efficient platform methodologies to guide their rational design when in contact with food materials. A detailed description of the current opportunities, challenges, and future scale-up possibilities of these nanoengineered surfaces in the food industry is also provided.
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Affiliation(s)
- Mehran Ghasemlou
- School of Science, STEM College, RMIT University, Melbourne, Victoria 3001, Australia
- Centre for Sustainable Bioproducts, Deakin University, Waurn Ponds, Victoria 3216, Australia
| | | | - Elena P Ivanova
- School of Science, STEM College, RMIT University, Melbourne, Victoria 3001, Australia
| | - Benu Adhikari
- School of Science, STEM College, RMIT University, Melbourne, Victoria 3001, Australia
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Colin J Barrow
- Centre for Sustainable Bioproducts, Deakin University, Waurn Ponds, Victoria 3216, Australia
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5
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Sun P, Jin Y, Yin Y, Wu C, Song C, Feng Y, Zhou P, Qin X, Niu Y, Liu Q, Zhang J, Wang Z, Hao X. Achieving Extreme Pressure Resistance to Liquids on a Super-Omniphobic Surface with Armored Reentrants. SMALL METHODS 2024; 8:e2201602. [PMID: 36919581 DOI: 10.1002/smtd.202201602] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 02/01/2023] [Indexed: 06/18/2023]
Abstract
Static repellency and pressure resistance to liquids are essential for high-performance super-omniphobic surfaces. However, these two merits appear mutually exclusive in conventional designs because of their conflicting structural demands: Static liquid repellency necessitates minimal solid-liquid contact, which in turn inevitably undercuts the surface's ability to resist liquid invasion exerted by the elevated pressure. Here, inspired by the Springtail, these two merits can be simultaneously realized by structuring surfaces at two size scales, with a micrometric reentrant structure providing static liquid repellency and a nanometric reentrant structure providing pressure resistance, which dexterously avoids the dilemma of their structural conflicts. The nanometric reentrants are densely packed on the micrometric ones, serving as "armor" that prevents liquids invasion by generating multilevel energy barriers, thus naming the surface as the armored reentrants (AR) surface. The AR surface could repel liquids with very low surface tensions, such as silicone oil (21 mN m-1), and simultaneously resist great pressure from the liquids, exemplified by enduring the impact of low-surface-tension liquids under a high weber number (>400), the highest-pressure resistance ever reported. With its scalable fabrication and enhanced performance, our design could extend the application scope of liquid-repellent surfaces toward ultimate industrial settings.
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Affiliation(s)
- Pengcheng Sun
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, P. R. China
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Yuankai Jin
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Yingying Yin
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Chenyang Wu
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Chuanhui Song
- Department of Oral and Maxillofacial Surgery, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, P. R. China
| | - Yawei Feng
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Peiyang Zhou
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Xuezhi Qin
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Yusheng Niu
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, P. R. China
| | - Qiankai Liu
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, P. R. China
| | - Jie Zhang
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, P. R. China
| | - Zuankai Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, P. R. China
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, P. R. China
| | - Xiuqing Hao
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, P. R. China
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Zhong X, Xie S, Guo Z. The Challenge of Superhydrophobicity: Environmentally Facilitated Cassie-Wenzel Transitions and Structural Design. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305961. [PMID: 38145324 PMCID: PMC10933658 DOI: 10.1002/advs.202305961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/02/2023] [Indexed: 12/26/2023]
Abstract
Superhydrophobic materials can be used in various fields to optimize production and life due to their unique surface wetting properties. However, under certain pressure and perturbation conditions, the droplets deposited on superhydrophobic materials are prone to change from Cassie state to Wenzel state, which limits the practical applications of the materials. In recent years, a large number of works have investigated the transition behavior, transition mechanism, and influencing factors of the wetting transition that occurs when a superhydrophobic surface is under a series of external environments. Based on these works, in this paper, the phenomenon and kinetic behavior of the destruction of the Cassie state and the mechanism of the wetting transition are systematically summarized under external conditions that promote the wetting transition on the material surface, including pressure, impact, evaporation, vibration, and electric wetting. In addition, superhydrophobic surface morphology has been shown to directly affect the duration of the Cassie state. Based on the published work the effects of specific morphology on the Cassie state, including structural size, structural shape, and structural level, are summarized in this paper from theoretical analyses and experimental data.
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Affiliation(s)
- Xin Zhong
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei UniversityWuhan430062China
| | - Shangzhen Xie
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei UniversityWuhan430062China
| | - Zhiguang Guo
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei UniversityWuhan430062China
- State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China
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7
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Yun GT, Kim Y, Ahn H, Kim M, Jang GM, Im SG, Jung WB, Jung HT. Toward Advanced Superomniphobicity: Hierarchical Insights from Serif-T Nanostructures to Microscale Wrinkles. ACS NANO 2024. [PMID: 38315048 DOI: 10.1021/acsnano.3c11182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Developing a superomniphobic surface that exceeds the static and dynamic repellency observed in nature's springtails for various liquids presents a significant challenge in the realm of surface and interface science. However, progress in this field has been particularly limited when dealing with low-surface-tension liquids. This is because dynamic repellency values are typically at least 2 orders of magnitude lower than those observed with water droplets. Our study introduces an innovative hierarchical topography demonstrating exceptional dynamic repellency to low-surface-tension liquids. Inspired by the structural advantages found in springtails, we achieve a static contact angle of >160° and the complete rebound of droplet impact with a Weber number (We) of ∼104 using ethanol. These results surpass all existing benchmarks that have been reported thus far, including those of natural surfaces. The key insight from our research is the vital role of the microscale air pocket size, governed by wrinkle wavelength, in both static and dynamic repellency. Additionally, nanoscale air pockets within serif-T nanostructures prove to be essential for achieving omniphobicity. Our investigations into the wetting dynamics of ethanol droplets further reveal aspects such as the reduction in contact time and the occurrence of a fragmentation phenomenon beyond We ∼ 350, which has not been previously observed.
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Affiliation(s)
- Geun-Tae Yun
- KAIST-UCBerkeley-Vietnam National University Climate Change Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Laboratory for Organic Optoelectronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Nanofab Center (NNFC), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Yesol Kim
- KAIST-UCBerkeley-Vietnam National University Climate Change Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Laboratory for Organic Optoelectronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Saudi Aramco-KAIST CO2 Management Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Hyunah Ahn
- KAIST-UCBerkeley-Vietnam National University Climate Change Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Laboratory for Organic Optoelectronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Minki Kim
- KAIST-UCBerkeley-Vietnam National University Climate Change Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Laboratory for Organic Optoelectronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Gyu Min Jang
- Hydrogen and Low-Carbon Energy R&D Lab, Posco Holdings, Pohang 37637, South Korea
| | - Sung Gap Im
- Functional Thin Film Laboratory (FTFL), Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Woo-Bin Jung
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Hee-Tae Jung
- KAIST-UCBerkeley-Vietnam National University Climate Change Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- National Laboratory for Organic Optoelectronic Materials, Department of Chemical and Biomolecular Engineering (BK-21 plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Saudi Aramco-KAIST CO2 Management Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
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8
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Peng N, Wang L, Jiang W, Li G, Chen B, Jiang W, Liu H. Flexible Platform Composed of T-Shaped Micropyramid Patterns toward a Waterproof Sensing Interface. ACS APPLIED MATERIALS & INTERFACES 2023; 15:56537-56546. [PMID: 37992157 DOI: 10.1021/acsami.3c13631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
Antifouling is essential to guaranteeing the sensitivity and precision of flexible sensing interfaces. Materials and structures are the two primary strategies. However, optimizing the inherent microstructures to integrate waterproofing and sensing is rarely reported. To improve the liquid repellency of micropyramid structures, this work presents a study of the design and fabrication of T-shaped micropyramid structures. These structures are patterned uniformly and largely on polydimethylsiloxane (PDMS) skin by the new process of two-step magnetic induction. The waterproofing is related to the breakthrough pressure and the liquid repellency, both of which are a function of structural characteristics, D, and material properties, θY. At the breakthrough transition, two failure models distinguished by θY appear: the depinning transition and the sagging transition. Meanwhile, when considering D in practice, some models will shift and occur early. The D value regulates the transition of the material's wettability to the liquid repellency. The influence of the material's inherent nonwettability on liquid repellency diminishes as D decreases, and the transition from completely wetting liquids to super-repellents can be achieved. Experiments demonstrate that for D = 0.3 under water the resistance is approximately 142 times larger than the depth of the structure, considerably facilitating the waterproofing of conventional micropyramid arrays. This work provides a novel method for fabricating flexible T-shaped micropyramid array structures and opens a new window on flexible sensing interfaces with excellent waterproofing.
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Affiliation(s)
- Niming Peng
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Lanlan Wang
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Wei Jiang
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Guojun Li
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Bangdao Chen
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Weitao Jiang
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hongzhong Liu
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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9
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Sharbatian A, Devkota K, Ashouri Vajari D, Stieglitz T. From Bioinspired Topographies toward Non-Wettable Neural Implants. MICROMACHINES 2023; 14:1846. [PMID: 37893283 PMCID: PMC10609157 DOI: 10.3390/mi14101846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 09/21/2023] [Accepted: 09/26/2023] [Indexed: 10/29/2023]
Abstract
The present study investigates different design strategies to produce non-wettable micropatterned surfaces. In addition to the classical method of measuring the contact angle, the non-wettability is also discussed by means of the immersion test. Inspired by non-wettable structures found in nature, the effects of features such as reentrant cavities, micropillars, and overhanging layers are studied. We show that a densely populated array of small diameter cavities exhibits superior non-wettability, with 65% of the cavities remaining intact after 24 h of full immersion in water. In addition, it is suggested that the wetting transition time is influenced by the length of the overhanging layer as well as by the number of columns within the cavity. Our findings indicate a non-wetting performance that is three times longer than previously reported in the literature for a small, densely populated design with cavities as small as 10 μm in diameter. Such properties are particularly beneficial for neural implants as they may reduce the interface between the body fluid and the solid state, thereby minimiing the inflammatory response following implantation injury. In order to assess the effectiveness of this approach in reducing the immune response induced by neural implants, further in vitro and in vivo studies will be essential.
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Affiliation(s)
- Ali Sharbatian
- Laboratory for Biomedical Microtechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany; (A.S.); (T.S.)
- BrainLinks BrainTools, Institute for Machine-Brain Interfacing Technology (IMBIT), University of Freiburg, 79110 Freiburg, Germany
| | - Kalyani Devkota
- Laboratory for Biomedical Microtechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany; (A.S.); (T.S.)
- BrainLinks BrainTools, Institute for Machine-Brain Interfacing Technology (IMBIT), University of Freiburg, 79110 Freiburg, Germany
| | - Danesh Ashouri Vajari
- Laboratory for Biomedical Microtechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany; (A.S.); (T.S.)
- BrainLinks BrainTools, Institute for Machine-Brain Interfacing Technology (IMBIT), University of Freiburg, 79110 Freiburg, Germany
| | - Thomas Stieglitz
- Laboratory for Biomedical Microtechnology, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany; (A.S.); (T.S.)
- BrainLinks BrainTools, Institute for Machine-Brain Interfacing Technology (IMBIT), University of Freiburg, 79110 Freiburg, Germany
- Bernstein Center Freiburg, University of Freiburg, 79104 Freiburg, Germany
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10
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Liu H, Zhang Z, Wu C, Su K, Kan X. Biomimetic Superhydrophobic Materials through 3D Printing: Progress and Challenges. MICROMACHINES 2023; 14:1216. [PMID: 37374801 DOI: 10.3390/mi14061216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/02/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023]
Abstract
Superhydrophobicity, a unique natural phenomenon observed in organisms such as lotus leaves and desert beetles, has inspired extensive research on biomimetic materials. Two main superhydrophobic effects have been identified: the "lotus leaf effect" and the "rose petal effect", both showing water contact angles larger than 150°, but with differing contact angle hysteresis values. In recent years, numerous strategies have been developed to fabricate superhydrophobic materials, among which 3D printing has garnered significant attention due to its rapid, low-cost, and precise construction of complex materials in a facile way. In this minireview, we provide a comprehensive overview of biomimetic superhydrophobic materials fabricated through 3D printing, focusing on wetting regimes, fabrication techniques, including printing of diverse micro/nanostructures, post-modification, and bulk material printing, and applications ranging from liquid manipulation and oil/water separation to drag reduction. Additionally, we discuss the challenges and future research directions in this burgeoning field.
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Affiliation(s)
- Haishuo Liu
- School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
| | - Zipeng Zhang
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Chenyu Wu
- Qingdao Institute for Theoretical and Computational Sciences, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China
| | - Kang Su
- School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
| | - Xiaonan Kan
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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11
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Friedrichs J, Helbig R, Hilsenbeck J, Pandey PR, Sommer JU, Renner LD, Pompe T, Werner C. Entropic repulsion of cholesterol-containing layers counteracts bioadhesion. Nature 2023; 618:733-739. [PMID: 37344647 DOI: 10.1038/s41586-023-06033-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 03/30/2023] [Indexed: 06/23/2023]
Abstract
Control of adhesion is a striking feature of living matter that is of particular interest regarding technological translation1-3. We discovered that entropic repulsion caused by interfacial orientational fluctuations of cholesterol layers restricts protein adsorption and bacterial adhesion. Moreover, we found that intrinsically adhesive wax ester layers become similarly antibioadhesive when containing small quantities (under 10 wt%) of cholesterol. Wetting, adsorption and adhesion experiments, as well as atomistic simulations, showed that repulsive characteristics depend on the specific molecular structure of cholesterol that encodes a finely balanced fluctuating reorientation at the interface of unconstrained supramolecular assemblies: layers of cholesterol analogues differing only in minute molecular variations showed markedly different interfacial mobility and no antiadhesive effects. Also, orientationally fixed cholesterol layers did not resist bioadhesion. Our insights provide a conceptually new physicochemical perspective on biointerfaces and may guide future material design in regulation of adhesion.
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Affiliation(s)
- Jens Friedrichs
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Ralf Helbig
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Julia Hilsenbeck
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Prithvi Raj Pandey
- Institute of Theory of Polymers, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Jens-Uwe Sommer
- Institute of Theory of Polymers, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
- Cluster of Excellence Physics of Life and Center of Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany
| | - Lars David Renner
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
| | - Tilo Pompe
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany
- Institute for Biochemistry, Leipzig University, Leipzig, Germany
| | - Carsten Werner
- Institute of Biofunctional Polymer Materials, Leibniz Institute of Polymer Research Dresden, Dresden, Germany.
- Cluster of Excellence Physics of Life and Center of Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany.
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12
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Seo D, Cho YH, Kim G, Shin H, Lee SK, Kim JE, Chun H, Jung JS, Choi Y. Permanent Anticoagulation Blood-Vessel by Mezzo-Sized Double Re-Entrant Structure. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2300564. [PMID: 37010002 DOI: 10.1002/smll.202300564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Indexed: 06/19/2023]
Abstract
Having a permanent omniphobicity on the inner surface of the tube can bring enormous advantages, such as reducing resistance and avoiding precipitation during mass transfer. For example, such a tube can prevent blood clotting when delivering blood composed of complex hydrophilic and lipophilic compounds. However, it is very challenging to fabricate micro and nanostructures inside a tube. To overcome these, a wearability and deformation-free structural omniphobic surface is fabricated. The omniphobic surface can repel liquids by its "air-spring" under the structure, regardless of surface tension. Furthermore, it is not lost an omniphobicity under physical deformation like curved or twisted. By using these properties, omniphobic structures on the inner wall of the tube by the "roll-up" method are fabricated. Fabricated omniphobic tubes still repels liquids, even complex liquids like blood. According to the ex vivo blood tests for medical usage, the tube can reduce thrombus formation by 99%, like the heparin-coated tube. So, it is believed the tube can be soon replaced typical coating-based medical surfaces or anticoagulation blood vessel.
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Affiliation(s)
- Dongkwon Seo
- Department of Bio-Convergence Engineering, Korea University, Seoul, 02841, Republic of Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Republic of Korea
| | - Yang Hyun Cho
- Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Seoul, 06351, Republic of Korea
| | - Gijung Kim
- Department of Bio-Convergence Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hyunku Shin
- Exopert Corporation, Seoul, 02841, Republic of Korea
| | - Su Kyoung Lee
- Korea Artificial Organ Center, Seoul, 02841, Republic of Korea
| | - Ji Eon Kim
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Honggu Chun
- Department of Bio-Convergence Engineering, Korea University, Seoul, 02841, Republic of Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Republic of Korea
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Jae Seung Jung
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Korea University, Seoul, 02841, Republic of Korea
| | - Yeonho Choi
- Department of Bio-Convergence Engineering, Korea University, Seoul, 02841, Republic of Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Republic of Korea
- Exopert Corporation, Seoul, 02841, Republic of Korea
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
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13
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Zhou H, Niu H, Wang H, Lin T. Self-Healing Superwetting Surfaces, Their Fabrications, and Properties. Chem Rev 2023; 123:663-700. [PMID: 36537354 DOI: 10.1021/acs.chemrev.2c00486] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The research on superwetting surfaces with a self-healing function against various damages has progressed rapidly in the recent decade. They are expected to be an effective approach to increasing the durability and application robustness of superwetting materials. Various methods and material systems have been developed to prepare self-healing superwetting surfaces, some of which mimic natural superwetting surfaces. However, they still face challenges, such as being workable only for specific damages, external stimulation to trigger the healing process, and poor self-healing ability in the water, marine, or biological systems. There is a lack of fundamental understanding as well. This article comprehensively reviews self-healing superwetting surfaces, including their fabrication strategies, essential rules for materials design, and self-healing properties. Self-healing triggered by different external stimuli is summarized. The potential applications of self-healing superwetting surfaces are highlighted. This article consists of four main sections: (1) the functional surfaces with various superwetting properties, (2) natural self-healing superwetting surfaces (i.e., plants, insects, and creatures) and their healing mechanism, (3) recent research development in various self-healing superwetting surfaces, their preparation, wetting properties in the air or liquid media, and healing mechanism, and (4) the prospects including existing challenges, our views and potential solutions to the challenges, and future research directions.
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Affiliation(s)
- Hua Zhou
- College of Textiles & Clothing, State Key Laboratory for Biofibers and Eco-textiles, Collaborative Innovation Centre for Eco-textiles of Shandong Province, Qingdao University, Qingdao 266071, China
| | - Haitao Niu
- College of Textiles & Clothing, State Key Laboratory for Biofibers and Eco-textiles, Collaborative Innovation Centre for Eco-textiles of Shandong Province, Qingdao University, Qingdao 266071, China
| | - Hongxia Wang
- Institute for Frontier Materials, Deakin University, Geelong Victoria 3216, Australia.,Institute for Nanofiber Intelligent Manufacture and Applications, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Tong Lin
- Institute for Nanofiber Intelligent Manufacture and Applications, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.,State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
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14
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Mail M, Walheim S, Schimmel T, Barthlott W, Gorb SN, Heepe L. Dry under water: air retaining properties of large-scale elastomer foils covered with mushroom-shaped surface microstructures. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:1370-1379. [PMID: 36483637 PMCID: PMC9704008 DOI: 10.3762/bjnano.13.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/26/2022] [Indexed: 06/17/2023]
Abstract
Superhydrophobic surfaces are well known for most different functions in plants, animals, and thus for biomimetic technical applications. Beside the Lotus Effect, one of their features with great technical, economic and ecologic potential is the Salvinia Effect, the capability to keep a stable air layer when submerged under water. Such air layers are of great importance, e.g., for drag reduction (passive air lubrication), antifouling, sensor applications or oil-water separation. Some biological models, e.g., the floating fern Salvinia or the backswimmer Notonecta, show long term stable air retention even under hydrodynamic conditions. Therefore, they are ideal models for the development of technical biomimetic air retaining surfaces. Up to now, several prototypes of such surfaces have been developed, but none provides both, stable air retention and cost effective large scale production. Meanwhile, a novel biomimetic surface is commercially available and produced on a large scale: an adhesive elastomeric film with mushroom-shaped surface microstructures that mimic the adhesion system of animals. In this study, we show that these films, which have been initially developed for a different purpose, due to their specific geometry at the microscale, are capable of stable air retention under water. We present first results concerning the capabilities of mushroom-shaped surface microstructures and show that this elastomer foil is able to stabilize a permanent air layer under water for more than two weeks. Further, the stability of the air layer under pressure was investigated and these results are compared with the predicted theoretical values for air retention of microstructured surfaces. Here, we could show that they fit to the theoretical predictions and that the biomimetic elastomer foil is a promising base for the development of an economically and efficient biomimetic air retaining surface for a broad range of technical applications.
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Affiliation(s)
- Matthias Mail
- Nees Institute for Biodiversity of Plants, University of Bonn, Venusbergweg 22, D-53115 Bonn, Germany
- Institute of Nanotechnology (INT) and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Stefan Walheim
- Institute of Nanotechnology (INT) and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Thomas Schimmel
- Institute of Nanotechnology (INT) and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Wilhelm Barthlott
- Nees Institute for Biodiversity of Plants, University of Bonn, Venusbergweg 22, D-53115 Bonn, Germany
| | - Stanislav N Gorb
- Department of Functional Morphology and Biomechanics, Institute of Zoology, Christian-Albrechts-University of Kiel, Am Botanischen Garten 1–9, D-24118 Kiel, Germany
| | - Lars Heepe
- Department of Functional Morphology and Biomechanics, Institute of Zoology, Christian-Albrechts-University of Kiel, Am Botanischen Garten 1–9, D-24118 Kiel, Germany
- Gottlieb Binder GmbH & Co KG, Bahnhofstr. 19, D-71088 Holzgerlingen, Germany
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15
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Konrad W, Neinhuis C, Roth-Nebelsick A. Straight roads into nowhere - obvious and not-so-obvious biological models for ferrophobic surfaces. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:1345-1360. [PMID: 36474925 PMCID: PMC9679617 DOI: 10.3762/bjnano.13.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 10/18/2022] [Indexed: 06/17/2023]
Abstract
There are currently efforts to improve strategies for biomimetic approaches, to identify pitfalls and to provide recommendations for a successful biomimetic work flow. In this contribution, a case study of a concrete biomimetic project is described that started with a posed technical problem for which seemingly obvious biological models exist. The technical problem was to devise a ferrophobic surface that prevents the contact between the copper surface of a tuyère (a water cooled aeration pipe within a blast furnace) and liquid iron. Therefore, biological external surfaces that strongly repel liquids appeared to be suitable, particularly the hair cover of the water fern Salvinia molesta and the surface of Collembola (an arthropod group). It turned out, however, that it was not feasible to realise the functional structures of both biological models for the tuyère problem. Instead, a seemingly not obvious biological model was identified, namely micropores within the cell walls of water-transporting conduits of plants that connect the conduits to a three-dimensional flow network. These specially shaped pores are assumed to be able to create stable air bodies, which support the refilling of embolised conduits. By adopting the shape of these micropores, a successful prototype for a ferrophobic copper surface repelling liquid iron could be devised. This case study illustrates that straight road maps from technical problems to obvious biological models are no guarantee for success, and that it is difficult to arrive at a formalised biomimetic working scheme. Rather, a broad understanding of biological function and its complexity is beneficial.
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Affiliation(s)
- Wilfried Konrad
- Institute of Botany, Technical University Dresden, Zellescher Weg 20b, D-01217 Dresden, Germany
- Department of Geosciences, University of Tübingen, Schnarrenbergstr. 94–96, D-72076 Tübingen, Germany
| | - Christoph Neinhuis
- Institute of Botany, Technical University Dresden, Zellescher Weg 20b, D-01217 Dresden, Germany
| | - Anita Roth-Nebelsick
- State Museum of Natural History Stuttgart, Rosenstein 1, D-70191 Stuttgart, Germany
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16
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Esmaeilzadeh P, Ghazanfari MH, Molaei Dehkordi A. Tuning the Wetting Properties of SiO 2-Based Nanofluids to Create Durable Surfaces with Special Wettability for Self-Cleaning, Anti-Fouling, and Oil–Water Separation. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pouriya Esmaeilzadeh
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 11155-9564, Iran
| | | | - Asghar Molaei Dehkordi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 11155-9564, Iran
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17
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Dudick S, Hess DW, Breedveld V. Liquid Repellence of Phobic Fiber Networks. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7357-7364. [PMID: 35622465 DOI: 10.1021/acs.langmuir.2c01059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The wetting behavior of fiber networks, which are central to many research and industrial applications, can be difficult to predict accurately owing to their complex, heterogeneous structure. The cylindrical pore model, widely used to interpret and predict the forced wetting of hydrophobic porous materials, often does not yield correct results when working with fibrous networks like paper substrates and non-woven fabrics. This is because these materials exhibit variation in pore size, fiber length, and fiber diameter, as well as a reentrant pore geometry. Quantitative prediction of the critical wetting resistance of hydrophobized papers to arbitrary entrant liquids requires a more sophisticated analytical approach that considers this unique fibrous structure and the effect of stochastic variations within the pore matrix. In this work, we directly measure the critical breakthrough pressure for different porous substrates across various wetting entrant liquids. To isolate the effects of the structure and stochastics on critical wetting behavior of fibrous networks, we analyze additional materials strategically chosen for their subsets of structural features. Ultimately, we formulate a method that demonstrates physical reasonableness, numerical accuracy, and the ability to elucidate the effects of pore size, pore size distribution, fiber diameter, fiber diameter distribution, surface wettability, and liquid surface tension on critical breakthrough pressure of liquids through hydrophobic fibrous networks.
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Affiliation(s)
- Sumner Dudick
- School of Chemical and Biomolecular Engineering and Renewable Bioproducts Institute, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Dennis W Hess
- School of Chemical and Biomolecular Engineering and Renewable Bioproducts Institute, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Victor Breedveld
- School of Chemical and Biomolecular Engineering and Renewable Bioproducts Institute, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
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18
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Kim S, Liu N, Shestopalov AA. Contact Printing of Multilayered Thin Films with Shape Memory Polymers. ACS NANO 2022; 16:6134-6144. [PMID: 35353499 PMCID: PMC9047662 DOI: 10.1021/acsnano.1c11607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
This study describes a method for transfer printing microarrays of multilayered organic-inorganic thin films using shape memory printing stamps and microstructured donor substrates. By applying the films on the microstructured donor substrates during physical vapor deposition and modulating the interfacial adhesion using a shape memory elastomer during printing, this method achieves (1) high lateral and feature-edge resolution and (2) high transfer efficiency from the donor to the receiver substrate. For demonstration, polyurethane-acrylate stamps and silicon/silicon oxide donor substrates were used in the large-area transfer printing of organic-inorganic thin-film stacks with micrometer lateral dimensions and sub-200 nm thickness.
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19
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Zhu P, Wang L. Microfluidics-Enabled Soft Manufacture of Materials with Tailorable Wettability. Chem Rev 2021; 122:7010-7060. [PMID: 34918913 DOI: 10.1021/acs.chemrev.1c00530] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Microfluidics and wettability are interrelated and mutually reinforcing fields, experiencing synergistic growth. Surface wettability is paramount in regulating microfluidic flows for processing and manipulating fluids at the microscale. Microfluidics, in turn, has emerged as a versatile platform for tailoring the wettability of materials. We present a critical review on the microfluidics-enabled soft manufacture (MESM) of materials with well-controlled wettability and their multidisciplinary applications. Microfluidics provides a variety of liquid templates for engineering materials with exquisite composition and morphology, laying the foundation for precisely controlling the wettability. Depending on the degree of ordering, liquid templates are divided into individual droplets, one-dimensional (1D) arrays, and two-dimensional (2D) or three-dimensional (3D) assemblies for the modular fabrication of microparticles, microfibers, and monolithic porous materials, respectively. Future exploration of MESM will enrich the diversity of chemical composition and physical structure for wettability control and thus markedly broaden the application horizons across engineering, physics, chemistry, biology, and medicine. This review aims to systematize this emerging yet robust technology, with the hope of aiding the realization of its full potential.
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Affiliation(s)
- Pingan Zhu
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
| | - Liqiu Wang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
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20
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Ding W, Dorao CA, Fernandino M. Improving superamphiphobicity by mimicking tree-branch topography. J Colloid Interface Sci 2021; 611:118-128. [PMID: 34933190 DOI: 10.1016/j.jcis.2021.12.056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 11/17/2022]
Abstract
when a droplet impacts on a superhydrophobic structured surface below a certain impact velocity, the droplet can bounce off completely from the surface. However, above such velocity a fraction of the droplet will pin on the surface. Surfaces capable of repelling water droplets are ubiquitous in nature or have been artificially fabricated. However, as the surface tension of the liquid is reduced, the capability of the surface to remain non-wetting gets hindered. Despite progress in previous research, the understanding and development of superamphiphobic surface to impacting low surface tension droplets remains elusive. It is proposed that multi-layer re-entrant like roughness can further enhance the anti-wetting properties also for low surface tension fluids. In this work, we produce patterned conical micro-structures with lateral nano-sized roughness. Furthermore, the droplet impact experiments are conducted on various surfaces with variable surface tensions (27 mN/m - 72 mN/m) by using droplets with different Weber numbers (2-170). We show that conical microstructures with lateral roughness mimicking tree-branches provides a surface topology capable of absorbing the force exerted by the droplet during the impact which prevents the droplet from pinning on the surface at higher impact velocity even for low surface tension droplets. Our study has significance for understanding the liquid interaction mechanism with the surface during the impact process and for the associated surface design considerations.
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Affiliation(s)
- Wenwu Ding
- Department of Energy and Process Engineering. Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Carlos Alberto Dorao
- Department of Energy and Process Engineering. Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Maria Fernandino
- Department of Energy and Process Engineering. Norwegian University of Science and Technology, Trondheim 7491, Norway.
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21
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Zhu H, Cai S, Liao G, Gao ZF, Min X, Huang Y, Jin S, Xia F. Recent Advances in Photocatalysis Based on Bioinspired Superwettabilities. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04049] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hai Zhu
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China
- 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 430074, People’s Republic of China
| | - Si Cai
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China
| | - Guangfu Liao
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, People’s Republic of China
| | - Zhong Feng Gao
- Collaborative Innovation Center of Tumor Marker Detection Technology, Equipment and Diagnosis-Therapy Integration in Universities of Shandong, Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers, College of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, People’s Republic of China
| | - Xuehong Min
- Key Laboratory of Catalysis and Energy Materials Chemistry of Education, Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan 430074, People’s Republic of China
| | - Yu Huang
- 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 430074, People’s Republic of 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 430074, People’s Republic of China
| | - Fan Xia
- 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 430074, People’s Republic of China
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22
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Fradin C, Guittard F, Darmanin T. Designing Tunable Omniphobic Surfaces by Controlling the Electropolymerization Sites of Carbazole‐Based Monomers. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Huang Z, Zhao S, Zhang Y, Cai Z, Li Z, Xiao J, Su M, Guo Q, Zhang C, Pan Y, Cai X, Song Y, Yang J. Tunable Fluid-Type Metasurface for Wide-Angle and Multifrequency Water-Air Acoustic Transmission. RESEARCH (WASHINGTON, D.C.) 2021; 2021:9757943. [PMID: 34671744 PMCID: PMC8501414 DOI: 10.34133/2021/9757943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 08/15/2021] [Indexed: 06/13/2023]
Abstract
Efficient acoustic communication across the water-air interface remains a great challenge owing to the extreme acoustic impedance mismatch. Few present acoustic metamaterials can be constructed on the free air-water interface for enhancing the acoustic transmission because of the interface instability. Previous strategies overcoming this difficulty were limited in practical usage, as well as the wide-angle and multifrequency acoustic transmission. Here, we report a simple and practical way to obtain the wide-angle and multifrequency water-air acoustic transmission with a tunable fluid-type acoustic metasurface (FAM). The FAM has a transmission enhancement of acoustic energy over 200 times, with a thickness less than the wavelength in water by three orders of magnitude. The FAM can work at an almost arbitrary water-to-air incident angle, and the operating frequencies can be flexibly adjusted. Multifrequency transmissions can be obtained with multilayer FAMs. In experiments, the FAM is demonstrated to be stable enough for practical applications and has the transmission enhancement of over 20 dB for wide frequencies. The transmission enhancement of music signal across the water-air interface was performed to demonstrate the applications in acoustic communications. The FAM will benefit various applications in hydroacoustics and oceanography.
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Affiliation(s)
- Zhandong Huang
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
| | - Shengdong Zhao
- School of Mathematics and Statistics, Qingdao University, Qingdao 266071, China
- Institute of Mechanics for Multifunctional Materials and Structures, Qingdao University, Qingdao 266071, China
| | - Yiyuan Zhang
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
| | - Zheren Cai
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS), Beijing 100190, China
| | - Zheng Li
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS), Beijing 100190, China
| | - Junfeng Xiao
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
| | - Meng Su
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS), Beijing 100190, China
| | - Qiuquan Guo
- Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518000, China
| | - Chuanzeng Zhang
- Department of Civil Engineering, University of Siegen, D-57068 Siegen, Germany
| | - Yaozong Pan
- Qingdao Branch of Institute of Acoustics, Chinese Academy of Sciences, Qingdao 266114, China
| | - Xiaobing Cai
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
| | - Yanlin Song
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS), Beijing 100190, China
| | - Jun Yang
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
- Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518000, China
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24
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Wang Y, Meng J, Wang S. Recent Progress of Bioinspired Scalephobic Surfaces with Specific Barrier Layers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8639-8657. [PMID: 34266239 DOI: 10.1021/acs.langmuir.1c01282] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bioinspired superwettable surfaces have been widely harnessed in diverse applications such as self-cleaning, oil/water separation, and liquid transport. So far, only a little work is focused on scalephobic capability of those superwettable surfaces. However, the troublesome scale deposition will inevitably be observed in our daily production and life, greatly reducing heat transfer efficiency and inhibiting the liquid transport. To address this annoying problem, as the emerging strategy, specific barrier layers are introduced onto superwettable surfaces to reduce or even avoid the direct contact between scale and the surfaces. In this feature article, we first provide the basic concept of bioinspired scalephobic surfaces with specific barrier layers. Then, we briefly introduce the typical fabrication methods of scalephobic surfaces. Later, we summarize recent progress of bioinspired scalephobic surfaces with specific barrier layers. Furthermore, we point out the guiding theory and criteria for the stability of barrier layers. Finally, we put forward the forecast on the existing problems and future direction in bioinspired scalephobic surfaces.
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Affiliation(s)
- Yixuan Wang
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jingxin Meng
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Shutao Wang
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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25
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Kim DH, Kim S, Park SR, Fang NX, Cho YT. Shape-Deformed Mushroom-like Reentrant Structures for Robust Liquid-Repellent Surfaces. ACS APPLIED MATERIALS & INTERFACES 2021; 13:33618-33626. [PMID: 34196537 DOI: 10.1021/acsami.1c06286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Artificial liquid-repellent surfaces inspired by biomimetic structures provide a wide range of functional surfaces for various practical applications, such as self-cleaning, antisticking, oil/water separation, and droplet manipulation. However, functional biomimetic structures cannot be fabricated using conventional techniques. For example, mushroom-like topologies on the skin of springtails, which are referred to as "doubly reentrant structures," have attracted significant attention owing to their extraordinary liquid-repellent properties. Current methods of fabricating these reentrant structures have several limitations, such as complex material systems, processing steps, and additional chemical treatments. This study proposed a simple micro-shape-deformed approach to fabricate mushroom-like reentrant structures by digital light processing, a three-dimensional (3D) printing technique, with volumetric shrinkage. The nonuniform cross-linking process and light propagation during photopolymerization caused the deformation of the topological patterns atop the micropillar arrays, resulting in bent structures for mushroom-like shape-deformed microarchitectures. This 3D-printed shape-deformed microstructure exhibits a highly stable liquid repellency without perfluorinated coatings.
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Affiliation(s)
- Do Hyeog Kim
- Department of Mechanical Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongnam 51140, Republic of Korea
| | - Seok Kim
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, United States of America
| | - Seo Rim Park
- Department of Smart Manufacturing Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongnam 51140, Republic of Korea
| | - Nicholas X Fang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, United States of America
| | - Young Tae Cho
- Department of Smart Manufacturing Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongnam 51140, Republic of Korea
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26
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Huang Y, Gancheva T, Favis BD, Abidli A, Wang J, Park CB. Hydrophobic Porous Polypropylene with Hierarchical Structures for Ultrafast and Highly Selective Oil/Water Separation. ACS APPLIED MATERIALS & INTERFACES 2021; 13:16859-16868. [PMID: 33749239 DOI: 10.1021/acsami.0c21852] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Recently, various porous absorbents have been developed and the in situ vacuum/pump-assisted continuous separation process has proven to be the most efficient technique to utilize those absorbents for oil spill cleanup. However, to achieve a high oil removal throughput, a high pumping pressure and/or large absorbent pore sizes are required, which would compromise the selectivity of oil/water separation, as water may penetrate the absorbent beyond a critical external pressure. In this work, this challenge has been circumvented by employing hierarchically porous polypropylene (PP) with controlled pore sizes generated from a tricontinuous heterophase polymer blend system. As compared to unimodal pores, the incorporation of the secondary smaller pores significantly enhances the oil removal throughput by up to 4-5 times without the necessity of raising the pumping pressure or increasing the diameter of the primary pores, which in turn, prevents compromising the oil/water separation selectivity.
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Affiliation(s)
- Yifeng Huang
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China
| | - Teodora Gancheva
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada
| | - Basil D Favis
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada
| | - Abdelnasser Abidli
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Jun Wang
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
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27
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Zhang W, Wang D, Sun Z, Song J, Deng X. Robust superhydrophobicity: mechanisms and strategies. Chem Soc Rev 2021; 50:4031-4061. [PMID: 33554976 DOI: 10.1039/d0cs00751j] [Citation(s) in RCA: 154] [Impact Index Per Article: 51.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Superhydrophobic surfaces hold great prospects for extremely diverse applications owing to their water repellence property. The essential feature of superhydrophobicity is micro-/nano-scopic roughness to reserve a large portion of air under a liquid drop. However, the vulnerability of the delicate surface textures significantly impedes the practical applications of superhydrophobic surfaces. Robust superhydrophobicity is a must to meet the rigorous industrial requirements and standards for commercial products. In recent years, major advancements have been made in elucidating the mechanisms of wetting transitions, design strategies and fabrication techniques of superhydrophobicity. This review will first introduce the mechanisms of wetting transitions, including the thermodynamic stability of the Cassie state and its breakdown conditions. Then we highlight the development, current status and future prospects of robust superhydrophobicity, including characterization, design strategies and fabrication techniques. In particular, design strategies, which are classified into passive resistance and active regeneration for the first time, are proposed and discussed extensively.
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Affiliation(s)
- Wenluan Zhang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.
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28
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Haghanifar S, Galante AJ, Leu PW. Challenges and Prospects of Bio-Inspired and Multifunctional Transparent Substrates and Barrier Layers for Optoelectronics. ACS NANO 2020; 14:16241-16265. [PMID: 33232118 DOI: 10.1021/acsnano.0c06452] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Bio-inspiration and advances in micro/nanomanufacturing processes have enabled the design and fabrication of micro/nanostructures on optoelectronic substrates and barrier layers to create a variety of functionalities. In this review article, we summarize research progress in multifunctional transparent substrates and barrier layers while discussing future challenges and prospects. We discuss different optoelectronic device configurations, sources of bio-inspiration, photon management properties, wetting properties, multifunctionality, functionality durability, and device durability, as well as choice of materials for optoelectronic substrates and barrier layers. These engineered surfaces may be used for various optoelectronic devices such as touch panels, solar modules, displays, and mobile devices in traditional rigid forms as well as emerging flexible versions.
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Affiliation(s)
- Sajad Haghanifar
- Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Anthony J Galante
- Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Paul W Leu
- Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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29
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Sterzenbach T, Helbig R, Hannig C, Hannig M. Bioadhesion in the oral cavity and approaches for biofilm management by surface modifications. Clin Oral Investig 2020; 24:4237-4260. [PMID: 33111157 PMCID: PMC7666681 DOI: 10.1007/s00784-020-03646-1] [Citation(s) in RCA: 82] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 10/15/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND All soft and solid surface structures in the oral cavity are covered by the acquired pellicle followed by bacterial colonization. This applies for natural structures as well as for restorative or prosthetic materials; the adherent bacterial biofilm is associated among others with the development of caries, periodontal diseases, peri-implantitis, or denture-associated stomatitis. Accordingly, there is a considerable demand for novel materials and coatings that limit and modulate bacterial attachment and/or propagation of microorganisms. OBJECTIVES AND FINDINGS The present paper depicts the current knowledge on the impact of different physicochemical surface characteristics on bioadsorption in the oral cavity. Furthermore, it was carved out which strategies were developed in dental research and general surface science to inhibit bacterial colonization and to delay biofilm formation by low-fouling or "easy-to-clean" surfaces. These include the modulation of physicochemical properties such as periodic topographies, roughness, surface free energy, or hardness. In recent years, a large emphasis was laid on micro- and nanostructured surfaces and on liquid repellent superhydrophic as well as superhydrophilic interfaces. Materials incorporating mobile or bound nanoparticles promoting bacteriostatic or bacteriotoxic properties were also used. Recently, chemically textured interfaces gained increasing interest and could represent promising solutions for innovative antibioadhesion interfaces. Due to the unique conditions in the oral cavity, mainly in vivo or in situ studies were considered in the review. CONCLUSION Despite many promising approaches for modulation of biofilm formation in the oral cavity, the ubiquitous phenomenon of bioadsorption and adhesion pellicle formation in the challenging oral milieu masks surface properties and therewith hampers low-fouling strategies. CLINICAL RELEVANCE Improved dental materials and surface coatings with easy-to-clean properties have the potential to improve oral health, but extensive and systematic research is required in this field to develop biocompatible and effective substances.
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Affiliation(s)
- Torsten Sterzenbach
- Clinic of Operative and Pediatric Dentistry, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307, Dresden, Germany.
| | - Ralf Helbig
- Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069, Dresden, Germany
| | - Christian Hannig
- Clinic of Operative and Pediatric Dentistry, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307, Dresden, Germany
| | - Matthias Hannig
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, University Hospital, Saarland University, Building 73, 66421, Homburg/Saar, Germany
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30
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Shi X, Zhang Y, Wu D, Wu T, Jiang S, Jiao Y, Wu S, Zhang Y, Hu Y, Ding W, Chu J. Femtosecond Laser-Assisted Top-Restricted Self-Growth Re-Entrant Structures on Shape Memory Polymer for Dynamic Pressure Resistance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12346-12356. [PMID: 32967422 DOI: 10.1021/acs.langmuir.0c02335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Bioinspired surface material with re-entrant texture has been proven effective in exhibiting good pressure resistance to droplets with low surface tension under static conditions. In this work, we combined femtosecond laser cutting with shape memory polymer (SMP) and tape to fabricate re-entrant micropillar arrays by proposing a top-restricted self-growth (TRSG) strategy. Our proposed TRSG strategy simplifies the fabrication process and improves the processing efficiency of the re-entrant structure-based surface material. The structural parameters of the re-entrant micropillar array (microdisk diameter D, center-to-center distance P, and height H) can be adjusted through our TRSG processing method. To better characterize the anti-infiltration ability of various re-entrant micropillars, we studied the dynamic process of ethylene glycol droplet deformation by applying external vertical vibration to the surface material. Three parameters (vibration mode, amplitude, and frequency) of the external excitation and structural parameters of the re-entrant micropillar array were systemically investigated. We found that the surface material had better dynamic pressure resistance when P and D of the re-entrant texture were 650 and 500 μm, respectively, after heating for 6 min. This work provides new insights into the preparation and characterization of the surface material, which may find potential applications in microdroplet manipulation, drug testing, and biological sensors.
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Affiliation(s)
- Xiangchao Shi
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230026, China
| | - Yachao Zhang
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
| | - Tao Wu
- Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
| | - Shaojun Jiang
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
| | - Yunlong Jiao
- Institute of Tribology, Hefei University of Technology, Hefei 230009, China
| | - Sizhu Wu
- School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yiyuan Zhang
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
| | - Weiping Ding
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230026, China
| | - Jiaru Chu
- CAS Key Laboratory of Mechanical Behaviour and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
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31
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Chudak M, Chopra V, Hensel R, Darhuber AA. Elastohydrodynamic Dewetting of Thin Liquid Films: Elucidating Underwater Adhesion of Topographically Patterned Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11929-11937. [PMID: 32903008 PMCID: PMC7558345 DOI: 10.1021/acs.langmuir.0c02005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/14/2020] [Indexed: 06/11/2023]
Abstract
In underwater adhesion of a topographically patterned surface with a very soft material such as human skin, the elastic deformation can be large enough to achieve solid-on-solid contact not only on top of the hills but also in the valleys of the substrate topography. In this context, we have studied the dynamics of dewetting of a thin liquid film confined between a rigid, periodic micropillar array and a soft, elastic sphere. In our experiments, we observed two very distinct dewetting morphologies. For large ratios of array period to micropillar height and width, the dewetted areas tend to have a diamond-like shape and expand with a rate similar to a flat, unpatterned substrate. When the array period is reduced, the morphology of the dry spot becomes irregular and its expansion rate is significantly reduced. We developed a fully coupled numerical model of the dewetting process that reproduces the key features observed in experiments. Moreover, we performed contact mechanics simulations to characterize the deformation of the elastomer and the shape of the dewetted area in a unit cell of the micropillar array.
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Affiliation(s)
- Maciej Chudak
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
| | - Vaishali Chopra
- INM
- Leibniz Institute for New Materials, Saarbrücken 66123, Germany
| | - René Hensel
- INM
- Leibniz Institute for New Materials, Saarbrücken 66123, Germany
| | - Anton A. Darhuber
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
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32
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Jung WB, Jang S, Cho SY, Jeon HJ, Jung HT. Recent Progress in Simple and Cost-Effective Top-Down Lithography for ≈10 nm Scale Nanopatterns: From Edge Lithography to Secondary Sputtering Lithography. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1907101. [PMID: 32243015 DOI: 10.1002/adma.201907101] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/20/2019] [Indexed: 05/24/2023]
Abstract
The development of a simple and cost-effective method for fabricating ≈10 nm scale nanopatterns over large areas is an important issue, owing to the performance enhancement such patterning brings to various applications including sensors, semiconductors, and flexible transparent electrodes. Although nanoimprinting, extreme ultraviolet, electron beams, and scanning probe litho-graphy are candidates for developing such nanopatterns, they are limited to complicated procedures with low throughput and high startup cost, which are difficult to use in various academic and industry fields. Recently, several easy and cost-effective lithographic approaches have been reported to produce ≈10 nm scale patterns without defects over large areas. This includes a method of reducing the size using the narrow edge of a pattern, which has been attracting attention for the past several decades. More recently, secondary sputtering lithography using an ion-bombardment technique was reported as a new method to create high-resolution and high-aspect-ratio structures. Recent progress in simple and cost-effective top-down lithography for ≈10 nm scale nanopatterns via edge and secondary sputtering techniques is reviewed. The principles, technical advances, and applications are demonstrated. Finally, the future direction of edge and secondary sputtering lithography research toward issues to be resolved to broaden applications is discussed.
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Affiliation(s)
- Woo-Bin Jung
- Department of Chemical and Biomolecular Engineering (BK-21 Plus), Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
- KAIST Institute for NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Sungwoo Jang
- Semiconductor R&D Center, Samsung Electronics Co., Ltd, 1, Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do, 18448, Republic of Korea
| | - Soo-Yeon Cho
- Department of Chemical and Biomolecular Engineering (BK-21 Plus), Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
- KAIST Institute for NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Hwan-Jin Jeon
- Department of Chemical Engineering and Biotechnology, Korea Polytechnic University, Siheung-si, Gyeonggi-do, 15073, Republic of Korea
| | - Hee-Tae Jung
- Department of Chemical and Biomolecular Engineering (BK-21 Plus), Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
- KAIST Institute for NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon, 34141, Republic of Korea
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33
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Affiliation(s)
- Hai Zhu
- Engineering Research Center of Nano‐Geomaterials of Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan China
| | - Yu Huang
- Engineering Research Center of Nano‐Geomaterials of Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan China
- Zhejiang Institute China University of Geosciences Hangzhou China
| | - Xiaoding Lou
- Engineering Research Center of Nano‐Geomaterials of Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan China
| | - Fan Xia
- 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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34
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Xu M, Liu CT, Kim CJ. Self-Powered Plastron Preservation and One-Step Molding of Semiactive Superhydrophobic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8193-8198. [PMID: 32589845 DOI: 10.1021/acs.langmuir.0c01289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Gas-trapping-typically superhydrophobic (SHPo)-surfaces are useful for underwater applications only while their plastron lasts. Because the plastron unfortunately disappears under most practical conditions, various active approaches to supply ample gas have been reported, including the semiactive SHPo surface based on self-regulated electrolysis. Here, we report two major advances: (i) a self-powered plastron restoration mechanism that obviates the need for external power; (ii) a one-step molding process to mass-manufacture semiactive SHPo surfaces. The advances clear major hurdles for real-world implementation.
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35
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Thermodynamic analysis of steady wetting state of droplet on single microstructure surface. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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36
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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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37
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Gonzalez-Avila SR, Nguyen DM, Arunachalam S, Domingues EM, Mishra H, Ohl CD. Mitigating cavitation erosion using biomimetic gas-entrapping microtextured surfaces (GEMS). SCIENCE ADVANCES 2020; 6:eaax6192. [PMID: 32258392 PMCID: PMC7101208 DOI: 10.1126/sciadv.aax6192] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 12/31/2019] [Indexed: 05/27/2023]
Abstract
Cavitation refers to the formation and collapse of vapor bubbles near solid boundaries in high-speed flows, such as ship propellers and pumps. During this process, cavitation bubbles focus fluid energy on the solid surface by forming high-speed jets, leading to damage and downtime of machinery. In response, numerous surface treatments to counteract this effect have been explored, including perfluorinated coatings and surface hardening, but they all succumb to cavitation erosion eventually. Here, we report on biomimetic gas-entrapping microtextured surfaces (GEMS) that robustly entrap air when immersed in water regardless of the wetting nature of the substrate. Crucially, the entrapment of air inside the cavities repels cavitation bubbles away from the surface, thereby preventing cavitation damage. We provide mechanistic insights by treating the system as a potential flow problem of a multi-bubble system. Our findings present a possible avenue for mitigating cavitation erosion through the application of inexpensive and environmentally friendly materials.
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Affiliation(s)
| | - Dang Minh Nguyen
- Department for Soft Matter, Institute for Physics, Otto-von-Guerick University, 39106 Magdeburg, Germany
- School of Physical and Mathematical Sciences, Department of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
| | - Sankara Arunachalam
- King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Biological and Environmental Science and Engineering (BESE) Division, Thuwal 23955-6900, Saudi Arabia
| | - Eddy M. Domingues
- King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Biological and Environmental Science and Engineering (BESE) Division, Thuwal 23955-6900, Saudi Arabia
| | - Himanshu Mishra
- King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Biological and Environmental Science and Engineering (BESE) Division, Thuwal 23955-6900, Saudi Arabia
| | - Claus-Dieter Ohl
- Department for Soft Matter, Institute for Physics, Otto-von-Guerick University, 39106 Magdeburg, Germany
- School of Physical and Mathematical Sciences, Department of Physics and Applied Physics, Nanyang Technological University, Singapore 637371, Singapore
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38
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Hu S, Cao X, Reddyhoff T, Puhan D, Vladescu SC, Wang Q, Shi X, Peng Z, deMello AJ, Dini D. Self-Compensating Liquid-Repellent Surfaces with Stratified Morphology. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4174-4182. [PMID: 31889435 DOI: 10.1021/acsami.9b22896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Artificial liquid-repellent surfaces have recently attracted vast scientific attention; however, achieving mechanical robustness remains a formidable challenge before industrialization can be realized. To this end, inspired by plateaus in geological landscapes, a self-compensating strategy is developed to pave the way for the synthesis of durable repellent surfaces. This self-compensating surface comprises tall hydrophobic structural elements, which can repel liquid droplets. When these elements are damaged, they expose shorter structural elements that also suspend the droplets and thus preserve interfacial repellency. An example of this plateau-inspired stratified surface was created by three-dimensional (3D) direct laser lithography micro-nano fabrication. Even after being subjected to serious frictional damage, it maintained static repellency to water with a contact angle above 147° and was simultaneously able to endure high pressures arising from droplet impacts. Extending the scope of nature-inspired functional surfaces from conventional biomimetics to geological landscapes, this work demonstrates that the plateau-inspired self-compensating strategy can provide an unprecedented level of robustness in terms of sustained liquid repellency.
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Affiliation(s)
- Songtao Hu
- State Key Laboratory of Mechanical System and Vibration , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Xiaobao Cao
- Department of Chemistry and Applied Biosciences , ETH Zurich , Zurich 8093 , Switzerland
| | - Tom Reddyhoff
- Department of Mechanical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
| | - Debashis Puhan
- Department of Mechanical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
| | - Sorin-Cristian Vladescu
- Department of Mechanical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
| | - Qian Wang
- Department of Mechanical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
| | - Xi Shi
- State Key Laboratory of Mechanical System and Vibration , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Zhike Peng
- State Key Laboratory of Mechanical System and Vibration , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Andrew J deMello
- Department of Chemistry and Applied Biosciences , ETH Zurich , Zurich 8093 , Switzerland
| | - Daniele Dini
- Department of Mechanical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
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Huang Z, Zhao S, Su M, Yang Q, Li Z, Cai Z, Zhao H, Hu X, Zhou H, Li F, Yang J, Wang Y, Song Y. Bioinspired Patterned Bubbles for Broad and Low-Frequency Acoustic Blocking. ACS APPLIED MATERIALS & INTERFACES 2020; 12:1757-1764. [PMID: 31818097 DOI: 10.1021/acsami.9b15683] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bubble crystals in water are expected to achieve the broad and low-frequency acoustic band gaps that are crucial for acoustic blocking. However, preparing patterned bubble crystals in water remains a challenge because of the instability of bubbly liquids. Here, inspired by biological superhydrophobic systems, we report a simple and rapid approach to prepare patterned bubble arrays in water and their applications in low-frequency acoustic blocking. Patterned bubbles with the desired size, shape, and position can be prepared. Single-layer bubble arrays can block the sounds at low frequencies because of local resonance. By varying the size and distance of the bubbles without changing the thickness, the operating frequency can change from 9 to 1756 kHz. Besides, by preparing multilayer bubbles, broad and low-frequency acoustic band gaps can be achieved, with the generalized width of γ (ratio of the bandgap width to its start frequency) reaching 1.26. This method provides a feasible strategy to control acoustic waves at low frequencies for applications such as acoustic blocking, focusing, imaging, and detecting.
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Affiliation(s)
- Zhandong Huang
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
- School of Chemistry and Chemical Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | | | - Meng Su
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
| | - Qiang Yang
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
| | - Zheng Li
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
- School of Chemistry and Chemical Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Zheren Cai
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
- School of Chemistry and Chemical Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Huanyu Zhao
- Institute of Engineering Mechanics , Beijing Jiaotong University , Beijing 100044 , People's Republic of China
| | - Xiaotian Hu
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
- School of Chemistry and Chemical Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Haihua Zhou
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
| | - Fengyu Li
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
| | - Jun Yang
- Department of Mechanical & Materials Engineering , Western University , London N6A 5B9 , Canada
| | - Yuesheng Wang
- Institute of Engineering Mechanics , Beijing Jiaotong University , Beijing 100044 , People's Republic of China
| | - Yanlin Song
- Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China
- School of Chemistry and Chemical Engineering , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
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Abstract
Despite emerging breakthroughs in the achievement of numerous elegant biomimetic structures that impart fascinating functionalities, bioinspired materials still suffer from poor structural durability, chemical reliability, flexibility, and optical transparency, as well as unaffordable cost and low throughput, thus preventing their broad real-life applications. In striking contrast to conventional wisdom, we demonstrate that the usually avoided and detrimental elastic crack phenomenon can be translated into powerful configurable-crack engineering to achieve structures and functions that are impossible to realize even using state-of-the-art techniques. Our approach dramatically enriches the freedom and flexibility in the design of materials to mimic various natural living organisms and paves the road for translating nature’s inspirations into real-world applications. Three-dimensional hierarchical morphologies widely exist in natural and biomimetic materials, which impart preferential functions including liquid and mass transport, energy conversion, and signal transmission for various applications. While notable progress has been made in the design and manufacturing of various hierarchical materials, the state-of-the-art approaches suffer from limited materials selection, high costs, as well as low processing throughput. Herein, by harnessing the configurable elastic crack engineering—controlled formation and configuration of cracks in elastic materials—an effect normally avoided in various industrial processes, we report the development of a facile and powerful technique that enables the faithful transfer of arbitrary hierarchical structures with broad material compatibility and structural and functional integrity. Our work paves the way for the cost-effective, large-scale production of a variety of flexible, inexpensive, and transparent 3D hierarchical and biomimetic materials.
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Filippov AE, Kovalev A, Gorb SN. Numerical simulation of the pattern formation of the springtail cuticle nanostructures. J R Soc Interface 2019; 15:rsif.2018.0217. [PMID: 30089687 DOI: 10.1098/rsif.2018.0217] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/13/2018] [Indexed: 11/12/2022] Open
Abstract
Springtails (Collembola) are known to exhibit complex hierarchical nanostructures of their exoskeleton surface that repels water and other fluids with remarkable efficiency. These nanostructures were previously widely studied due to their structure, chemistry and fluid-repelling properties. These ultrastructural and chemical studies revealed the involvement of different components in different parts of the nanopattern, but the overall process of self-assembly into the complex rather regular structures observed remains unclear. Here, we model this process from a theoretical point of view partially using solutions related to the so-called Tammes problem. By using densities of three different reacting substances, we obtained a typical morphology that is highly similar to the ones observed on the cuticle of some springtail species. These results are important not only for our understanding of the formation of hierarchical nanoscale structures in nature, but also for the fabrication of novel surface coatings.
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Affiliation(s)
- A E Filippov
- Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten, 1-9, 24118 Kiel, Germany .,Donetsk Institute for Physics and Engineering, NASU, Donetsk, Ukraine
| | - A Kovalev
- Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten, 1-9, 24118 Kiel, Germany
| | - S N Gorb
- Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten, 1-9, 24118 Kiel, Germany
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42
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Wang Z, Lin K, Zhao YP. The effect of sharp solid edges on the droplet wettability. J Colloid Interface Sci 2019; 552:563-571. [DOI: 10.1016/j.jcis.2019.05.081] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/23/2019] [Accepted: 05/24/2019] [Indexed: 11/29/2022]
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Surface topographies of biomimetic superamphiphobic materials: design criteria, fabrication and performance. Adv Colloid Interface Sci 2019; 269:87-121. [PMID: 31059923 DOI: 10.1016/j.cis.2019.04.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 03/15/2019] [Accepted: 04/24/2019] [Indexed: 12/26/2022]
Abstract
Superamphiphobicity is a wetting phenomenon that not only water but also oils or organic solvents with low surface tension exhibit large contact angles above 150° along with low contact angle hysteresis on solid surface. It is well known that both chemical constituent and surface roughness have impacts on the wettability of solid surface. Herein, several fundamental wetting states and design criteria for re-entrant structures are introduced first. Then, various chemical modification materials endowing solid substrates low surface energy are summarized subsequently. Furthermore, roughening processes conferring hierarchical or re-entrant topographic structures on surfaces are classified based on different types of topographies abstracted from the natural oil-repellent creatures (mushroom-like structures) as well as bio-inspired superamphiphobic surfaces (i.e., randomly distributed nanostructures, regularly patterned microstructures and other complex hierarchical structures). Significantly, the impalement pressure and formulated rules of various re-entrant profiles are recommended in detail. At the same time, fabrication, outstanding performances such as mechanical durability, chemical stability are also mentioned according to different types of morphologies. Beyond that, current fabrication obstacles and future prospects are proposed simultaneously in the end.
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Panter JR, Gizaw Y, Kusumaatmaja H. Multifaceted design optimization for superomniphobic surfaces. SCIENCE ADVANCES 2019; 5:eaav7328. [PMID: 31501770 PMCID: PMC6719413 DOI: 10.1126/sciadv.aav7328] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 05/14/2019] [Indexed: 05/31/2023]
Abstract
Superomniphobic textures are at the frontier of surface design for vast arrays of applications. Despite recent substantial advances in fabrication methods for reentrant and doubly reentrant microstructures, design optimization remains a major challenge. We overcome this in two stages. First, we develop readily generalizable computational methods to systematically survey three key wetting properties: contact angle hysteresis, critical pressure, and minimum energy wetting barrier. For each, we uncover multiple competing mechanisms, leading to the development of quantitative models and correction of inaccurate assumptions in prevailing models. Second, we combine these analyses simultaneously, demonstrating the power of this strategy by optimizing structures that are designed to overcome challenges in two emerging applications: membrane distillation and digital microfluidics. As the wetting properties are antagonistically coupled, this multifaceted approach is essential for optimal design. When large surveys are impractical, we show that genetic algorithms enable efficient optimization, offering speedups of up to 10,000 times.
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Affiliation(s)
- J R Panter
- Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
| | - Y Gizaw
- Procter and Gamble Co., Winton Hill Business Center, 6210 Center Hill Avenue, Cincinnati, OH, USA
| | - H Kusumaatmaja
- Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
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Li J, Song Y, Zheng H, Feng S, Xu W, Wang Z. Designing biomimetic liquid diodes. SOFT MATTER 2019; 15:1902-1915. [PMID: 30758033 DOI: 10.1039/c9sm00072k] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Just as the innovation of electronic diodes that allow the current to flow in one direction provides a foundation for the development of digital technologies, the engineering of surfaces or devices that allow the directional and spontaneous transport of fluids, termed liquid diodes, is highly desired in a wide spectrum of applications ranging from medical microfluidics, advanced printing, heat management and water collection to oil-water separation. Recent advances in manufacturing, visualization techniques, and biomimetics have led to exciting progress in the design of various liquid diodes. In spite of exciting progress, formulating a general framework broad enough to guide the design, optimization and fabrication of engineered liquid diodes remains a challenging task to date. In this review, we first present an overview of the development of biological and engineered liquid diodes to elucidate how to control the surface chemistry and topography to regulate the transport of liquids without the need for external energy. Then the latest design strategies allowing for the creation of longitudinal and transverse liquid diodes are discussed and compared. We also define some figures of merit such as the rectification coefficient and the transport velocity and distance to quantify the performance of liquid diodes. Finally, we highlight perspectives on the development of engineered liquid diodes that transcend nature and adapt to various practical applications.
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Affiliation(s)
- Jiaqian Li
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, China
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Seo D, Cha SK, Kim G, Shin H, Hong S, Cho YH, Chun H, Choi Y. Flexible and Stable Omniphobic Surfaces Based on Biomimetic Repulsive Air-Spring Structures. ACS APPLIED MATERIALS & INTERFACES 2019; 11:5877-5884. [PMID: 30648844 DOI: 10.1021/acsami.8b20521] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In artificial biological circulation systems such as extracorporeal membrane oxygenation, surface wettability is a critical factor in blood clotting problems. Therefore, to prevent blood from clotting, omniphobic surfaces are required to repel both hydrophilic and oleophilic liquids and reduce surface friction. However, most omniphobic surfaces have been fabricated by combining chemical reagent coating and physical structures and/or using rigid materials such as silicon and metal. It is almost impossible for chemicals to be used in the omniphobic surface for biomedical devices due to durability and toxicity. Moreover, a flexible and stable omniphobic surface is difficult to be fabricated by using conventional rigid materials. This study demonstrates a flexible and stable omniphobic surface by mimicking the re-entrant structure of springtail's skin. Our surface consists of a thin nanohole membrane on supporting microstructures. This structure traps air under the membrane, which can repel the liquid on the surface like a spring and increase the contact angle regardless of liquid type. By theoretical wetting model and simulation, we confirm that the omniphobic property is derived from air trapped in the structure. Also, our surface well maintains the omniphobicity under a highly pressurized condition. As a proof of our concept and one of the real-life applications, blood experiments are performed with our flat and curved surfaces and the results including contact angle, advancing/receding angles, and residuals show significant omniphobicity. We hope that our omniphobic surface has a significant impact on blood-contacting biomedical applications.
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Affiliation(s)
| | | | | | | | | | - Yang Hyun Cho
- Department of Thoracic and Cardiovascular Surgery , Samsung Medical Center, Sungkyunkwan University School of Medicine , Seoul 06351 , Republic of Korea
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Bhushan B. Lessons from nature for green science and technology: an overview and bioinspired superliquiphobic/philic surfaces. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2019; 377:20180274. [PMID: 30967074 DOI: 10.1098/rsta.2018.0274] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
Nature has developed materials, objects and processes that function from the macroscale to the nanoscale. The emerging field of biomimetics allows one to mimic biology or nature to develop nanomaterials, nanodevices and processes which provide desirable properties. The biologically inspired materials and structured surfaces are being explored for various commercial applications. These should have minimum human impact on the environment, leading to eco-friendly or green science and technology. There are a large number of flora and fauna including bacteria, plants, land and aquatic animals, and seashells with properties of commercial interest. The paper presents an overview of the general field of biomimetics followed by a detailed overview of mechanisms, fabrication techniques and characterization of superliquiphobic/philic surfaces and their applications. This article is part of the theme issue 'Bioinspired materials and surfaces for green science and technology'.
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Affiliation(s)
- Bharat Bhushan
- Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, The Ohio State University , Columbus, OH 43210-1142 , USA
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Kim H, Han H, Lee S, Woo J, Seo J, Lee T. Nonfluorinated Superomniphobic Surfaces through Shape-Tunable Mushroom-like Polymeric Micropillar Arrays. ACS APPLIED MATERIALS & INTERFACES 2019; 11:5484-5491. [PMID: 30576594 DOI: 10.1021/acsami.8b17181] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Superomniphobic surfaces showing extremely liquid-repellent properties have received a great amount of attention as they can be used in various industrial and biomedical applications. However, so far, the fabrication processes of these materials mostly have involved the coating of perfluorocarbons onto micro- and nanohierarchical structures of these surfaces, which inevitably causes environmental pollution, leading to health concerns. Herein, we developed a facile method to obtain flexible superomniphobic surfaces without perfluorocarbon coatings that have shape-tunable mushroom-like micropillars (MPs). Inspired by the unique structures on the skin of springtails, we fabricated mushroom-like structures with downward facing edges (i.e., a doubly re-entrant structure) on a surface. The flexible MP structures were fabricated using a conventional micromolding technique, and the shapes of the mushroom caps were made highly tunable via the deposition of a thin aluminum (Al) layer. Due to the compressive residual stress of the Al, the mushroom caps were observed to bend toward the polymer upon forming doubly re-entrant-MP structures. The obtained surface was found to repel most low-surface-tension liquids such as oils, alcohols, and even fluorinated solvents. The developed flexible superomniphobic surface showed liquid repellency even upon mechanical stretching and after surface energy modification. We envision that the developed superomniphobic surface with high flexibility and wetting resistance after surface energy modification will be used in a wide range of applications such as self-cleaning clothes and gloves.
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Affiliation(s)
- Hyunchul Kim
- School of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Heetak Han
- School of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Sanggeun Lee
- School of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Janghoon Woo
- School of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Jungmok Seo
- Center for Biomaterials, Biomedical Research Institute , Korea Institute of Science and Technology (KIST) , Seoul 02792 , Republic of Korea
| | - Taeyoon Lee
- School of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
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Liu Y, Liu W, Feng D, Wei Z, Guo T, Wang G, Song Z. Structure-induced superhydrophilicity of silica membranes through hybridization and self-assembly of different dispersed nanoparticles. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.09.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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50
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Sun Y, Guo Z. Recent advances of bioinspired functional materials with specific wettability: from nature and beyond nature. NANOSCALE HORIZONS 2019; 4:52-76. [PMID: 32254145 DOI: 10.1039/c8nh00223a] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Through 3.7 billion years of evolution and natural selection, plants and animals in nature have ingeniously fulfilled a broad range of fascinating functions to achieve optimized performance in responding and adapting to changes in the process of interacting with complex natural environments. It is clear that the hierarchically organized micro/nanostructures of the surfaces of living organisms decisively manage fascinating and amazing functions, regardless of the chemical components of their building blocks. This conclusion now allows us to elucidate the underlying mechanisms whereby these hierarchical structures have a great impact on the properties of the bulk material. In this review, we mainly focus on advances over the last three years in bioinspired multiscale functional materials with specific wettability. Starting from selected naturally occurring surfaces, manmade bioinspired surfaces with specific wettability are introduced, with an emphasis on the cooperation between structural characteristics and macroscopic properties, including lotus leaf-inspired superhydrophobic surfaces, fish scale-inspired superhydrophilic/underwater superoleophobic surfaces, springtail-inspired superoleophobic surfaces, and Nepenthes (pitcher plant)-inspired slippery liquid-infused porous surfaces (SLIPSs), as well as other multifunctional surfaces that combine specific wettability with mechanical properties, optical properties and the unidirectional transport of liquid droplets. Afterwards, various top-down and bottom-up fabrication techniques are presented, as well as emerging cutting-edge applications. Finally, our personal perspectives and conclusions with regard to the transfer of micro- and nanostructures to engineered materials are provided.
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Affiliation(s)
- Yihan Sun
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
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