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Gao SR, Jia QH, Liu Z, Shi SH, Wang YF, Zheng SF, Yang YR, Hsu SH, Yan WM, Wang XD. Bouncing Dynamics of Drops' Successive Off-Center Impact. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:10759-10768. [PMID: 38712734 DOI: 10.1021/acs.langmuir.4c00913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Bouncing dynamics of a trailing drop off-center impacting a leading drop with varying time intervals and Weber numbers are investigated experimentally. Whether the trailing drop impacts during the spreading or receding process of the leading drop is determined by the time interval. For a short time interval of 0.15 ≤ Δt* ≤ 0.66, the trailing drop impacts during the spreading of the leading drop, and the drops completely coalesce and rebound; for a large time interval of 0.66 < Δt* ≤ 2.21, the trailing drop impacts during the receding process, and the drops partially coalesce and rebound. Whether the trailing drop directly impacts the surface or the liquid film of the leading drop is determined by the Weber number. The trailing drop impacts the surface directly at moderate Weber numbers of 16.22 ≤ We ≤ 45.42, while it impacts the liquid film at large Weber numbers of 45.42 < We ≤ 64.88. Intriguingly, when the trailing drop impacts the surface directly or the receding liquid film, the contact time increases linearly with the time interval but independent of the Weber number; when the trailing drop impacts the spreading liquid film, the contact time suddenly increases, showing that the force of the liquid film of the leading drop inhibits the receding of the trailing drop. Finally, a theoretical model of the contact time for the drops is established, which is suitable for different impact scenarios of the successive off-center impact. This study provides a quantitative relationship to calculate the contact time of drops successively impacting a superhydrophobic surface, facilitating the design of anti-icing surfaces.
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Affiliation(s)
- Shu-Rong Gao
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
| | - Qi-Hui Jia
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Zhe Liu
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Shi-Hua Shi
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Yi-Feng Wang
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Shao-Fei Zheng
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Yan-Ru Yang
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
| | - Shu-Han Hsu
- Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Wei-Mon Yan
- Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Xiao-Dong Wang
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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2
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Cline C, Wang H, Kong J, Li T, Liu J, Wegst UGK. Heterogeneous Ice Nucleation Studied with Single-Layer Graphene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15121-15131. [PMID: 36448835 DOI: 10.1021/acs.langmuir.2c02144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Control of heterogeneous ice nucleation (HIN) is critical for applications that range from iceophobic surfaces to ice-templated materials. HIN on 2D materials is a particular interesting topic that still lacks extensive experimental investigations. Here, we focus on the HIN on single-layer graphene (SLG) transferred onto different substrates, including silicon, silica, and thermal oxide on silicon. Complemented by other samples without SLG, we obtain a large range of wetting contact angles (WCAs) from 2° to 95°. All pristine SLG samples exhibit a large contact angle of ∼95°, which is close to the theoretical value of 96° for free-standing SLG, irrespective of the substrate and even in the presence of nanoscale wrinkles on SLG, which are due to the transfer process, indicating that the topographical features have little impact on the wetting behavior. Interestingly, SLG displays changes in hydrophobicity upon repeated water droplet freezing-melting-drying cycles due to a shift in Fermi level and/or enhanced water-substrate polar molecular interactions, likely induced by residual adsorption of H2O molecules. We found that a 0.04 eV decrease in SLG Fermi level reduces the SLG/water interface energy by ∼6 mJ/m2, thereby making SLG less hydrophobic. Counterintuitively, the reduction in SLG/water interface energy and the enhanced hydrophilicity after repeated freezing-melting-evaporation cycles actually decreases the freezing temperature by ∼3-4 °C, thereby slightly retarding rather than enhancing HIN. We also found that the water droplet freezing temperature differed by only ∼1 °C on different substrates with WCAs from 2° to 95°, an intriguing and yet reasonable result that confirms that wettability alone is not a good indicator of HIN capability. The HIN rate is rather determined by the difference between substrate/water and substrate/ice interface energies, which was found to stay almost constant for substrates weakly interacting with water/ice via van der Waals or hydrogen bonds, irrespective of hydrophilicity.
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Affiliation(s)
- Cory Cline
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Haozhe Wang
- Department of Materials Science and Engineering, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Boston, Massachusetts 02139, United States
| | - Jing Kong
- Department of Materials Science and Engineering, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Boston, Massachusetts 02139, United States
| | - Tianshu Li
- Department of Civil and Environmental Engineering, George Washington University, Washington, D.C. 20052, United States
| | - Jifeng Liu
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Ulrike G K Wegst
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States
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SAMAH W, CLAIN P, RIOUAL F, FOURNAISON L, DELAHAYE A. Experimental investigation on the wetting behavior of a superhydrophobic surface under controlled temperature and humidity. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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Huang W, Huang J, Guo Z, Liu W. Icephobic/anti-icing properties of superhydrophobic surfaces. Adv Colloid Interface Sci 2022; 304:102658. [PMID: 35381422 DOI: 10.1016/j.cis.2022.102658] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/26/2022] [Accepted: 03/26/2022] [Indexed: 01/31/2023]
Abstract
In the winter, icing on solid surfaces is a typical occurrence that may create a slew of hassles and even tragedies. Anti-icing surfaces are one of the effective solutions for this kind of problem. The roughness of a superhydrophobic surface traps air and weakens the contact between the solid surface and liquid water, allowing water droplets to be removed before freezing. At present, the conventional anti-icing methods including mechanical or thermal technology are not only surface structure unfriendly but also have the obsessions of low efficiency, high energy consumption and high manufacturing costs. Hence, developing a way to remove ice by just modifying the surface shape or chemical composition with a low surface energy is extremely desirable. Numerous attempts have been made to investigate the evolution of ice nucleation and icing on superhydrophobic surfaces under the direction of the ice nucleation hypothesis. In this paper, the research progress of ice nucleation in recent years is reviewed from theoretical and application. The icephobic surfaces are described using the wettability and classical nucleation theories. The benefits and drawbacks of anti-icing superhydrophobic surface are summarized, as well as deicing methods. Finally, several applications of ice phobic materials are illustrated, and some problems and challenges in the research field are discussed. We believed that this review will be useful in guiding future water freezing initiatives.
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5
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Zhang L, Wang K, An H, Li G, Su Y, Zhang W, Yang X. Spontaneous Imbibition of Capillaries under the End Effect and Wetting Hysteresis. ACS OMEGA 2022; 7:4363-4371. [PMID: 35155929 PMCID: PMC8829942 DOI: 10.1021/acsomega.1c06155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 01/21/2022] [Indexed: 06/14/2023]
Abstract
The phenomenon of spontaneous imbibition is widely present in the development process of tight oil/gas reservoirs. To further explore the spontaneous imbibition behavior of capillary tubes to provide theoretical and methodological references for the study of microscopic porous media imbibition phenomena, the capillaries that can be observed with the naked eye on the order of 10-100 μm were selected as research objects. Based on the theory of interface chemistry, the capillary end effect, and wetting hysteresis, the influence of the additional pressures generated by the two-phase interface on the spontaneous absorption of the horizontal capillary was studied. Some of the capillaries were processed for wettability, and then the water wettability of different capillaries was measured by the introduced concept, which is the conversion height of the self-absorption phase in the capillary. The capillaries were horizontally placed in the liquid for a spontaneous imbibition experiment, and the air-liquid two-phase menisci behavior was observed at the same time, and then the influence of water wettability, surfactant, and capillary diameter on spontaneous imbibition was discussed. It was found that in the equal diameter capillaries, the spontaneous air-liquid imbibition behavior of capillary tubes with different water wetting properties is different in sensitivity to surfactants and tube diameters; when surfactants are used to improve capillary water wettability to increase spontaneous imbibition efficiency, the initial water wettability of the capillary and the comprehensive changes in the capillary pressure caused by interfacial tension should be considered.
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Affiliation(s)
- Leilei Zhang
- Key
Laboratory of Enhanced Oil and Gas Recovery, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
- Baili
College of Petroleum Engineering, Lanzhou
City University, Lanzhou 730070, China
| | - Keliang Wang
- Key
Laboratory of Enhanced Oil and Gas Recovery, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
| | - Huiming An
- Baili
College of Petroleum Engineering, Lanzhou
City University, Lanzhou 730070, China
| | - Gen Li
- Key
Laboratory of Enhanced Oil and Gas Recovery, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
| | - Yu Su
- Key
Laboratory of Enhanced Oil and Gas Recovery, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
| | - Wei Zhang
- Key
Laboratory of Enhanced Oil and Gas Recovery, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
| | - Xinyi Yang
- Baili
College of Petroleum Engineering, Lanzhou
City University, Lanzhou 730070, China
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6
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Alcaire M, Lopez-Santos C, Aparicio FJ, Sanchez-Valencia JR, Obrero JM, Saghi Z, Rico VJ, de la Fuente G, Gonzalez-Elipe AR, Barranco A, Borras A. 3D Organic Nanofabrics: Plasma-Assisted Synthesis and Antifreezing Behavior of Superhydrophobic and Lubricant-Infused Slippery Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16876-16885. [PMID: 31738565 DOI: 10.1021/acs.langmuir.9b03116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Herein, we present the development of supported organic nanofabrics formed by a conformal polymer-like interconnection of small-molecule organic nanowires and nanotrees. These organic nanostructures are fabricated by a combination of vacuum and plasma-assisted deposition techniques to generate step by step, single-crystalline organic nanowires forming one-dimensional building blocks, organic nanotrees applied as three-dimensional templates, and the polymer-like shell that produces the final fabric. The complete procedure is carried out at low temperatures and is compatible with an ample variety of substrates (polymers, metal, ceramics; either planar or in the form of meshes) yielding flexible and low solid-fraction three-dimensional nanostructures. The systematic investigation of this progressively complex organic nanomaterial delivers key clues relating their wetting, nonwetting, and anti-icing properties with their specific morphology and outer surface composition. Water contact angles higher than 150° are attainable as a function of the nanofabric shell thickness with outstanding freezing-delay times (FDT) longer than 2 h at -5 °C. The role of the extremely low roughness of the shell surface is settled as a critical feature for such an achievement. In addition, the characteristic interconnected microstructure of the nanofabrics is demonstrated as ideal for the fabrication of slippery liquid-infused porous surfaces (SLIPS). We present the straightforward deposition of the nanofabric on laser patterns and the knowledge of how this approach provides SLIPS with FDTs longer than 5 h at -5 °C and 1 h at -15 °C.
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Affiliation(s)
- Maria Alcaire
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - Carmen Lopez-Santos
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
- Departamento de Física Atómica, Molecular y Nuclear , Universidad de Sevilla , Avda. Reina Mercedes s/n , 41012 Seville , Spain
| | - Francisco J Aparicio
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - Juan R Sanchez-Valencia
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
- Departamento de Física Atómica, Molecular y Nuclear , Universidad de Sevilla , Avda. Reina Mercedes s/n , 41012 Seville , Spain
| | - Jose M Obrero
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - Zineb Saghi
- Univ. Grenoble Alpes , CEA, LETI , F-38000 Grenoble , France
| | - Victor J Rico
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - German de la Fuente
- Instituto de Ciencia de Materiales de Aragón , CSIC-Universidad de Zaragoza , 50018 Zaragoza , Spain
| | - Agustin R Gonzalez-Elipe
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - Angel Barranco
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
| | - Ana Borras
- Nanotechnology on Surfaces and Plasma Laboratory , Materials Science Institute of Seville, CSIC-US , C/Americo Vespucio 49 , 41092 , Seville , Spain
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7
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Rico VJ, López-Santos C, Villagrá M, Espinós JP, de la Fuente GF, Angurel LA, Borrás A, González-Elipe AR. Hydrophobicity, Freezing Delay, and Morphology of Laser-Treated Aluminum Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6483-6491. [PMID: 31002515 DOI: 10.1021/acs.langmuir.9b00457] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Until recently, superhydrophobicity was considered as a hint to predict surface icephobicity, an association of concepts that is by no means universal and that has been proven to depend on different experimental factors and material properties, including the actual morphology and chemical state of surfaces. This work presents a systematic study of the wetting and freezing properties of aluminum Al6061, a common material widely used in aviation, after being subjected to nanosecond pulsed IR laser treatments to modify its surface roughness and morphology. All treated samples, independent of their surface finishing state, presented initially an unstable hydrophilic wetting behavior that naturally evolved with time to reach hydrophobicity or even superhydrophobicity. To stabilize the surface state and to bestow the samples with a permanent and stable hydrophobic character, laser-treated surfaces were covered with a thin layer of CF x prepared by plasma-enhanced chemical vapor deposition. A systematic comparison between freezing delay (FD) and wetting properties of water droplets onto these plasma-/polymer-modified laser-treated surfaces that, under conditions where a heterogeneous nucleation mechanism prevails, surface morphology rather than the actual value of the surface roughness parameter the key feature for long FD times. In particular, it is found that surface morphologies rendering a Cassie-Baxter wetting regime longer FDs than those characterized by a Wenzel-like wetting state. It is that laser treatment, with or without additional coverage with thin CF x coatings, affects wetting and ice formation behaviors and might be an efficient procedure to mitigate icing problems on metal surfaces.
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Affiliation(s)
- Víctor J Rico
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
| | - Carmen López-Santos
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
| | - Martín Villagrá
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
| | - Juan P Espinós
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
| | - German F de la Fuente
- Instituto de Ciencia de Materiales de Aragón (CSIC-Univ. Zaragoza) , c/María de Luna 3 , 50018 Zaragoza , Spain
| | - Luis A Angurel
- Instituto de Ciencia de Materiales de Aragón (CSIC-Univ. Zaragoza) , c/María de Luna 3 , 50018 Zaragoza , Spain
| | - Ana Borrás
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
| | - Agustín R González-Elipe
- Nanotechnology on Surfaces laboratory , Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla) , Avda. Américo Vespucio 49 , 41092 Sevilla , Spain
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8
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A molecular dynamics study on the wettability of graphene-based silicon dioxide (glass) surface. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.02.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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9
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Boinovich LB, Emelyanenko AM, Emelyanenko KA, Modin EB. Modus Operandi of Protective and Anti-icing Mechanisms Underlying the Design of Longstanding Outdoor Icephobic Coatings. ACS NANO 2019; 13:4335-4346. [PMID: 30951285 DOI: 10.1021/acsnano.8b09549] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Atmospheric icing has become a global concern due to hazardous consequences of ice accretion on air, land, and sea transport and infrastructure. Icephobic surfaces due to their physicochemical properties facilitate a decrease in ice and snow accumulation under outdoor conditions. However, a serious problem of most superhydrophobic surfaces described in the literature is poor operational durability under harsh corrosive and abrasive loads characteristic of atmospheric operation. Here, we elucidate main surface phenomena determining the anti-icing behavior and show experimentally how different mechanisms contribute to long-term durability. For comprehensive exploitation of those mechanisms, we have applied a recently proposed strategy based on fine-tuning of both laser processing and protocols of deposition of the fluorooxysilanes onto the nanotextured surface. Prolonged outdoor tests evidence that a developed strategy for modification of materials on the nanolevel allows overcoming the main drawbacks of icephobic coatings reported so far and results in resistance to destroying atmospheric impacts.
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Affiliation(s)
- Ludmila B Boinovich
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , 119071 Moscow , Russia
| | - Alexandre M Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , 119071 Moscow , Russia
| | - Kirill A Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , 119071 Moscow , Russia
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10
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Shen Y, Wu Y, Tao J, Zhu C, Chen H, Wu Z, Xie Y. Spraying Fabrication of Durable and Transparent Coatings for Anti-Icing Application: Dynamic Water Repellency, Icing Delay, and Ice Adhesion. ACS APPLIED MATERIALS & INTERFACES 2019; 11:3590-3598. [PMID: 30589262 DOI: 10.1021/acsami.8b19225] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Anti-icing/icephobic coatings, typically applied in the form of surface functional materials, are considered to be an ideal selection to solve the icing issues faced by daily life and industrial production. However, the applications of anti-icing coatings are greatly limited by the two main challenges: bonding strength with substrates and stability of the high anti-icing performance. Here, we designed and fabricated a kind of high-performance superhydrophobic fluorinated silica (F-SiO2)@polydimethylsiloxane coatings and further emphasized the improvement of the bonding strength with substrates and the maintenance of high anti-icing performance. The resultant coatings exhibited excellent water repellency with a contact angle up to 155.3° and a very short contact time (∼10.2 ms) of impact droplets. At low temperatures, the coming droplets still rapidly rebounded off the coating surface, and the superhydrophobic coatings displayed a more than 50-fold increase of freezing time comparing with bare aluminum. The ice adhesion strength on the coatings was only 26.3 kPa, which was far less than that (821.9 kPa) of bare aluminum. Furthermore, the nanoporous structures constructed by anodic oxidation could tremendously enhance the bonding strength of the coatings with the substrate, which was evaluated through a standard method (ASTM D3359). The anti-icing properties still retained high stability under the conditions of 30 icing/deicing cycles, soaking, and scouring of acid solution (pH = 5.6). This work can effectively push the anti-icing coatings toward a real-world application.
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Affiliation(s)
| | | | | | | | - Haifeng Chen
- Department of Materials Chemistry, Qiuzhen School , Huzhou University , 759, East 2nd Road , Huzhou 313000 , P. R. China
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11
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Ng YH, Tay SW, Hong L. Formation of Icephobic Surface with Micron-Scaled Hydrophobic Heterogeneity on Polyurethane Aerospace Coating. ACS APPLIED MATERIALS & INTERFACES 2018; 10:37517-37528. [PMID: 30284438 DOI: 10.1021/acsami.8b13403] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Development of an anti-icing surface on a desired industrial coating patch/object has been the persistent challenge to several industries, such as aviation and wind power. For this aim, performing surface modification to implement the icephobic property on existing commercial coatings is important for practical applications. This work accomplishes an icephobic coating overlying a PPG aerospace polyurethane coating. It manifests a clear capability to delay the formation of frost as well as to reduce the adhesion strength of ice. This icephobic coating is sustained by a unique hydrophobic heterogeneity in the micron-scale of segregation, which is realized through solution casting of a specific copolymer consisting of random rigid and soft segments, namely poly(methyl methacrylate) and poly(lauryl methacrylate-2-hydroxy-3-(1-amino dodecyl)propyl methacrylate), respectively. A wrinkled pattern developed over the coating is observed because of the diverse traits between these two segments. Besides, the OH/NH groups of the soft segment are crosslinked by a diisocyanate monomer upon drying and curing to strengthen the coating. More importantly, integration of a small dose of paraffin wax into the copolymer induces a spread of soft microdomains on the winkled pattern surface. It is hypothesized that these dual heterogeneous assemblies are responsible for the icephobicity since they instigate distinct interactions with condensed water droplets. Lastly, the thermoelectric cooling (Peltier effect) and the adhesion strength of ice on the typical coatings were assessed. This investigation also includes examination on the icephobic durability of coating, which is enhanced when a small amount of polyethylene oligomer is incorporated into the coating.
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Affiliation(s)
- Yeap-Hung Ng
- Department of Chemical & Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| | - Siok-Wei Tay
- Institute of Materials Research and Engineering , 2 Fusionopolis Way, Innovis, #08-03 , Singapore 138634 , Singapore
| | - Liang Hong
- Department of Chemical & Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
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12
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Bezdomnikov AA, Emel’yanenko AM, Emel’yanenko KA, Boinovich LB. Delay in the Freezing of Supercooled Water Drops on Superhydrophobic Surfaces of Silicone Rubber at Negative Temperatures. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024418010077] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Foroutan M, Zahedi H, Esmaeilian F. Temperature effects on spreading of water nano-droplet on poly(methyl methacrylate): A molecular dynamics simulation study. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/polb.24409] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Masumeh Foroutan
- Department of Physical Chemistry, School of Chemistry, College of Science; University of Tehran; Tehran 1417614418 Iran
| | - Hojat Zahedi
- Department of Physical Chemistry, School of Chemistry, College of Science; University of Tehran; Tehran 1417614418 Iran
| | - Farshad Esmaeilian
- Department of Physical Chemistry, School of Chemistry, College of Science; University of Tehran; Tehran 1417614418 Iran
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14
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Emelyanenko AM, Boinovich LB, Bezdomnikov AA, Chulkova EV, Emelyanenko KA. Reinforced Superhydrophobic Coating on Silicone Rubber for Longstanding Anti-Icing Performance in Severe Conditions. ACS APPLIED MATERIALS & INTERFACES 2017; 9:24210-24219. [PMID: 28657289 DOI: 10.1021/acsami.7b05549] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present a simple method for fabricating the superhydrophobic coatings on composite silicone rubber used for electrical outdoor applications. The coating is characterized by contact angles as high as 170° and is mechanically durable in contact with the aqueous phase. We discuss the impact of mechanical durability of the surface texture on the anti-icing performance of the coating on the basis of the experimental data on freezing delay of sessile aqueous droplets. A set of complementary data obtained in laboratory and outdoor experiments on freezing delay time, variation of wettability and practical work of adhesion for supercooled aqueous sessile droplets, impacting behavior of droplets at low negative temperatures, as well as the results of snow and ice accumulation in outdoor experiments indicate the very prospective icephobic properties of the developed coating.
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Affiliation(s)
- Alexandre M Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Leninsky prospect 31 bld. 4, 119071 Moscow, Russia
| | - Ludmila B Boinovich
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Leninsky prospect 31 bld. 4, 119071 Moscow, Russia
| | - Alexey A Bezdomnikov
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Leninsky prospect 31 bld. 4, 119071 Moscow, Russia
| | - Elizaveta V Chulkova
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Leninsky prospect 31 bld. 4, 119071 Moscow, Russia
| | - Kirill A Emelyanenko
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry , Leninsky prospect 31 bld. 4, 119071 Moscow, Russia
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Comparison of different coating techniques on the properties of FucoPol films. Int J Biol Macromol 2017; 103:268-274. [PMID: 28499944 DOI: 10.1016/j.ijbiomac.2017.05.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 04/12/2017] [Accepted: 05/05/2017] [Indexed: 11/22/2022]
Abstract
Plasma deposition, liquid flame spray (LFS) and atomic layer deposition (ALD) were used to form inorganic coatings in new exopolysaccharide (FucoPol) biodegradable films. Coated films were characterised in terms of surface, optical and barrier properties in order to evaluate their potential use in food packaging. FucoPol films presented dense and homogeneous surface with instant water contact angle of 95̊. Plasma deposition of perfluorohexane (PFH) on FucoPol surface has not shown significant improvement in the hydrophobic behaviour over the time. The FucoPol coating of SiO2 nanoparticles deposited by LFS and plasma deposition of PFH have shown higher instant water contact angle (135°) caused by coating surface roughness, but this hydrophobic behaviour was not stable over time. FucoPol films coated only with TiO2 deposited by ALD and combination of that with plasma deposition of PFH have shown stable water contact angle during time (90̊ and 115̊, respectively), transparency in the same order of magnitude and significantly lower permeability to water vapour (3.45×10-11mol/m s Pa and 3.45×10-11mol/m s Pa when compared to uncoated films with 5.32×10-11mol/m s Pa). Moreover, films coated with TiO2-PFH have also shown a permeability to oxygen of 1.70×10-16molm/m2sPa which is 67% lower than uncoated films.
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Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete. ENTROPY 2016. [DOI: 10.3390/e18040132] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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