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Wang J, Guo Z, Fu F. Locomotion behavior of air bubbles on solid surfaces. Adv Colloid Interface Sci 2024; 332:103266. [PMID: 39153417 DOI: 10.1016/j.cis.2024.103266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 05/20/2024] [Accepted: 07/31/2024] [Indexed: 08/19/2024]
Abstract
Air bubbles are a common occurrence in both natural and industrial settings and are a significant topic in the fields of physics, chemistry, engineering, and medicine. The physical phenomena of the contact between bubbles and submerged solid surfaces, as well as the locomotion behavior of bubbles, are worth exploring. Bubbles are generated in an unbounded liquid environment and rise due to unbalanced external forces. Bubbles of different diameters follow different ascending paths, after which they approach, touch, collide, bounce, and finally adsorb to the solid surface, forming a stable three-phase contact line (TPCL). The bubbles are in an unstable state due to the unbalanced external forces on the solid surface and the effects generated by the two-phase contact surface, resulting in different locomotion behaviors on the solid surface. Studying the formation, transport, aggregation, and rupture behaviors of bubbles on solid surfaces can enable the controllable operation of bubbles. This, in turn, can effectively reduce the loss of mechanical apparatus in agro-industrial production activities and improve corresponding production efficiency. Recent research has shown that the degree of bubble wetting on a solid surface is a crucial factor in the locomotion behavior of bubbles on that surface. This has led to significant progress in the study of bubble wetting, which has in turn greatly advanced our understanding of bubble behavior. Based on this, exploring the manipulation process of the directional motion of bubbles is a promising research direction. The locomotion behavior of bubbles on solid surfaces can be controlled by changing external conditions, leading to the integration of bubble behavior in various scientific and technological fields. Studying the dynamics of bubbles in liquids with infinite boundaries is worthwhile. Additionally, the manipulation process and mode of these bubbles is a popular research direction.
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Affiliation(s)
- Jing Wang
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, PR China
| | - Zhiguang Guo
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, PR China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
| | - Feiyan Fu
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
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2
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Wong WSY, Naga A, Armstrong T, Karunakaran B, Poulikakos D, Ras RHA. Designing Plastrons for Underwater Bubble Capture: From Model Microstructures to Stochastic Nanostructures. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2403366. [PMID: 38953394 PMCID: PMC11434225 DOI: 10.1002/advs.202403366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 06/05/2024] [Indexed: 07/04/2024]
Abstract
Bubbles and foams are often removed via chemical defoamers and/or mechanical agitation. Designing surfaces that promote chemical-free and energy-passive bubble capture is desirable for numerous industrial processes, including mineral flotation, wastewater treatment, and electrolysis. When immersed, super-liquid-repellent surfaces form plastrons, which are textured solid topographies with interconnected gas domains. Plastrons exhibit the remarkable ability of capturing bubbles through coalescence. However, the two-step mechanics of plastron-induced bubble coalescence, namely, rupture (initiation and location) and subsequent absorption (propagation and drainage) are not well understood. Here, the influence of 1) topographical feature size and 2) gas fraction on bubble capture dynamics is investigated. Smaller feature sizes accelerate rupture while larger gas fractions markedly improve absorption. Rupture is initiated solely on solid domains and is more probable near the edges of solid features. Yet, rupture time becomes longer as solid fraction increases. This counterintuitive behavior represents unexpected complexities. Upon rupture, the bubble's moving liquid-solid contact line influences its absorption rate and equilibrium state. These findings show the importance of rationally minimizing surface feature sizes and contact line interactions for rapid bubble rupture and absorption. This work provides key design principles for plastron-induced bubble coalescence, inspiring future development of industrially-relevant surfaces for underwater bubble capture.
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Affiliation(s)
- William S. Y. Wong
- Department of Applied PhysicsSchool of ScienceAalto UniversityEspooFI‐02150Finland
| | - Abhinav Naga
- Department of PhysicsDurham UniversityDurhamDH1 3LEUnited Kingdom
- Institute for Multiscale Thermofluids, School of EngineeringUniversity of EdinburghEdinburghEH9 3FDUnited Kingdom
| | - Tobias Armstrong
- Laboratory for Multiphase Thermofluidics and Surface NanoengineeringDepartment of Mechanical and Process EngineeringETH ZurichZurich8092Switzerland
| | | | - Dimos Poulikakos
- Laboratory of Thermodynamics in Emerging TechnologiesDepartment of Mechanical and Process EngineeringETH ZurichZurich8092Switzerland
| | - Robin H. A. Ras
- Department of Applied PhysicsSchool of ScienceAalto UniversityEspooFI‐02150Finland
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3
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Drago‐González A, Fauconnier M, Karunakaran B, Wong WSY, Ras RHA, Nieminen HJ. Ultrasonic Healing of Plastrons. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2403028. [PMID: 38946620 PMCID: PMC11434134 DOI: 10.1002/advs.202403028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 05/28/2024] [Indexed: 07/02/2024]
Abstract
Superhydrophobic surfaces (SHS) exhibit a pronounced ability to resist wetting. When immersed in water, water does not penetrate between the microstructures of the SHS. Instead, a thin layer of trapped gas remains, i.e., plastron. This fractional wetting is also known as the Cassie-Baxter state (CB). Impairment of superhydrophobicity occurs when water penetrates the plastron and, when complete wetting is achieved, a Wenzel state (W) results. Subsequent recovery back to CB state is one of the main challenges in the field of SHS wetting. Current methods for plastron recovery require complex mechanical or chemical integration, are time-consuming or lack spatial control. Here an on-demand, contact-less approach for performing facile transitions between these wetting states at micrometer length scales is proposed. This is achieved by the use of acoustic radiation force (ARF) produced by high-intensity focused ultrasound (HIFU). Switching from CB to W state takes <100 µs, while the local recovery back to CB state takes <45 s. To the best of authors knowledge, this is the first demonstration of ARF-induced manipulation of the plastron enabling facile two-way controlled switching of wetting states.
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Affiliation(s)
- Alex Drago‐González
- Dept. of Neuroscience and Biomedical EngineeringAalto UniversityEspooUusimaa02150Finland
| | - Maxime Fauconnier
- Dept. of Neuroscience and Biomedical EngineeringAalto UniversityEspooUusimaa02150Finland
| | | | | | - Robin H. A. Ras
- Dept. of Applied PhysicsAalto UniversityEspooUusimaa02150Finland
| | - Heikki J. Nieminen
- Dept. of Neuroscience and Biomedical EngineeringAalto UniversityEspooUusimaa02150Finland
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Zheng J, Tu C, Du P, Chen J, Li Y, Gao S, Lin J, Bao F. On-Demand Transport Bubbles Adhering to Noncontiguous Patterned Superhydrophobic Surfaces Using a Superhydrophobic Tweezer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:15322-15331. [PMID: 38981013 DOI: 10.1021/acs.langmuir.4c02063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Bubble transportation and related flotation are ubiquitous phenomena in nature and industry. Various surfaces with distinct morphologies and specific wettability properties have been engineered by organisms in nature and by humans to facilitate the targeted movement of bubbles. However, existing methods predominantly rely on continuous surfaces, limiting the ability of bubbles to deviate from their path before reaching their intended destination. Therefore, directional transportation of bubbles using noncontiguous surfaces still remains a significant challenge. Inspired by water spiders' ability to capture bubbles underwater using their hydrophobic surface for survival, we propose a novel transport strategy that utilizes patterned superhydrophobic surfaces (PSHSs) and a superhydrophobic tweezer. This strategy is implemented by switching between the hood mode and puncture mode of the moving three-phase contact lines to load and unload the bubble. To quantitatively evaluate the loss ratio of the bubble during transportation, a simple and exquisite bubble-weighing apparatus is devised. Our findings indicate that circular PSHSs demonstrate superior bubble adhesion and achieve the highest bubble transport ratio of 95.1%. In order to validate the promising application of this novel method, we employ the computer numerical control (CNC) technology to facilitate the autonomous loading and precise transportation of underwater bubbles, as well as the blending and ionization of combustible gas bubbles with air bubbles at different volume ratios.
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Affiliation(s)
- Jingyi Zheng
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Chengxu Tu
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Pengfei Du
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Ji Chen
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Yichen Li
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Shanqing Gao
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
| | - Jianzhong Lin
- Key Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education, Ningbo 315201, China
| | - Fubing Bao
- Zhejiang Provincial Key Laboratory of Flow Measurement Technology, China Jiliang University, Hangzhou 310018, China
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5
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Recoverable underwater superhydrophobicity from a fully wetted state via dynamic air spreading. iScience 2021; 24:103427. [PMID: 34877492 PMCID: PMC8633030 DOI: 10.1016/j.isci.2021.103427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/06/2021] [Accepted: 11/07/2021] [Indexed: 11/24/2022] Open
Abstract
Maintaining the superhydrophobicity underwater offers drag resistance reduction, antifouling, anti-corrosion, noise reduction, and gas collection for boat hulls and submarine vehicles. However, superhydrophobicity typically does not last long underwater since the Cassie state is metastable. Here, we report a reversible and localized recovery of superhydrophobicity from the fully wetted state via air bubble spreading. Composed of sparse fluorinated chained nanoparticles, the submerged surface shows super-low energy barrier for bubble attachment. Especially the recovered plastron exhibits excellent longevity. Based on a simplified, truncated nanocone model, the dynamic spreading of bubbles is analyzed considering two basic parameters, i.e., surface geometric structure and surface energy (which appeared as intrinsic water contact angle). Numerical simulation results via COMSOL confirms the effect of geometric structure on bubble spreading. This investigation will not only offer new insights for the design of robust recoverable superhydrophobic surfaces but also broaden the applications of superhydrophobic coatings. Superhydrophobicity is recovered from fully wetted state in submerged system The dynamic spreading of bubbles is theoretically analyzed The geometric criteria provide direction in designing superhydrophobic surfaces
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6
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Ong XY, Taylor SE, Ramaioli M. On the formation of dry granular jets at a liquid surface. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Hegner KI, Wong WSY, Vollmer D. Ultrafast Bubble Bursting by Superamphiphobic Coatings. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101855. [PMID: 34365676 PMCID: PMC11468632 DOI: 10.1002/adma.202101855] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/12/2021] [Indexed: 05/18/2023]
Abstract
Controlling bubble motion or passively bursting bubbles using solid interfaces is advantageous in numerous industrial applications including flotation, catalysis, electrochemical processes, and microfluidics. Current research has explored the formation, dissolution, pinning, and rupturing of bubbles on different surfaces. However, the ability to tune and control the rate of bubble bursting is not yet achieved. Scaling down surface-induced bubble bursting to just a few milliseconds is important for any application. In this work, the hierarchical structure of superamphiphobic surfaces is tuned in order to rapidly rupture contacting bubbles. Surfaces prepared using liquid flame spray show ultrafast bubble bursting (down to 2 ms) and superior durability. The coatings demonstrate excellent mechanical and chemical stability even in the presence of surface-active species. Air from the ruptured bubble is absorbed into the aerophilic Cassie-state. Long-term applicability is demonstrated by preventing the accumulation of air in the plastron via a connection of the plastron to the environment. The times recorded for bubble rupture and complete reorganization of air are reduced by approximately a factor of 3 compared to previously reported values. The concept is utilized to passively control surfactant-rich foam in froth flotation. Material collection efficiency increased by more than 60 times compared to controls.
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Affiliation(s)
- Katharina I. Hegner
- Physics at InterfacesMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - William S. Y. Wong
- Physics at InterfacesMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Doris Vollmer
- Physics at InterfacesMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
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8
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Panchanathan D, Bourrianne P, Nicollier P, Chottratanapituk A, Varanasi KK, McKinley GH. Levitation of fizzy drops. SCIENCE ADVANCES 2021; 7:7/28/eabf0888. [PMID: 34233873 PMCID: PMC8262817 DOI: 10.1126/sciadv.abf0888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 05/26/2021] [Indexed: 05/29/2023]
Abstract
As first described by Leidenfrost, liquid droplets levitate over their own vapor when placed on a sufficiently hot substrate. The Leidenfrost effect not only confers remarkable properties such as mechanical and thermal insulation, zero adhesion, and extreme mobility but also requires a high energetic thermal cost. We describe here a previously unexplored approach using active liquids able to sustain levitation in the absence of any external forcing at ambient temperature. We focus on the particular case of carbonated water placed on a superhydrophobic solid and demonstrate how millimetric fizzy drops self-generate a gas cushion that provides levitation on time scales on the order of a minute. Last, we generalize this new regime to different kinds of chemically reactive droplets able to jump from the Cassie-Baxter state to a levitating regime, paving the way to the levitation of nonvolatile liquids.
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Affiliation(s)
- Divya Panchanathan
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Philippe Bourrianne
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Philippe Nicollier
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Abhijatmedhi Chottratanapituk
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Kripa K Varanasi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
| | - Gareth H McKinley
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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9
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Jafari Gukeh M, Roy T, Sen U, Ganguly R, Megaridis CM. Lateral Spreading of Gas Bubbles on Submerged Wettability-Confined Tracks. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11829-11835. [PMID: 32921058 DOI: 10.1021/acs.langmuir.0c01719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Spreading of liquid droplets on wettability-confined paths has attracted considerable attention in the past decade. On the other hand, the inverse scenario of a gas bubble spreading on a submerged, wettability-confined track has rarely been studied. In the present work, an experimental investigation of the spreading of millimetric gas bubbles on horizontally submerged, textured, wettability-confined tracks is carried out. The width of the track is kept fixed along its entire length, and the spreading behavior of a gas bubble, dispensed at one end of the track, is studied. The effects of varying track width, bubble diameter, and ambient liquid are investigated. Post-contact, the gas bubble spreads along the track at a linear rate with time, while remaining pinned at its back end; the recorded spreading speed is O(0.5 m/s). An inertio-capillary force balance describes the experimentally observed spreading dynamics with excellent agreement.
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Affiliation(s)
- Mohamad Jafari Gukeh
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Tamal Roy
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Uddalok Sen
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Physics of Fluids Group, Max Planck Center Twente for Complex Fluid Dynamics, Department of Science and Technology, MESA+ Institute, and J. M. Burgers Center for Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands
| | - Ranjan Ganguly
- Department of Power Engineering, Jadavpur University, Kolkata 700106, India
| | - Constantine M Megaridis
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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10
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Kannan A, Hristov P, Li J, Zawala J, Gao P, Fuller GG. Surfactant-laden bubble dynamics under porous polymer films. J Colloid Interface Sci 2020; 575:298-305. [DOI: 10.1016/j.jcis.2020.04.086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/20/2020] [Accepted: 04/20/2020] [Indexed: 11/29/2022]
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11
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Anisotropic Spreading of Bubbles on Superaerophilic Straight Trajectories beneath a Slide in Water. WATER 2020. [DOI: 10.3390/w12030798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Although the bubble contacting a uniformly superaerophilic surface has caused concern due to its application potential in various engineering equipment, such as mineral flotation, very little is known about the mechanism of how the bubble spreads on a surface with anisotropic superaerophilicity. To unveil this mystery, we experimentally studied the anisotropic behavior of a bubble (2 mm in diameter) spreading on the superaerophilic straight trajectories (SALTs) of different widths (0.5 mm–5 mm) in water using a high-speed shadowgraphy system. The 1–3 bounces mostly happened as the bubble approached the SALTs before its spreading. It is first observed that the bubble would be split into two highly symmetrical sub-bubbles with similar migration velocity in opposite directions during the anisotropic spreading. Two essential mechanisms are found to be responsible for the anisotropic spreading on the narrow SALTs (W ≤ 2 mm with two subregimes) and the wide SALTs (W ≥ 3 mm with four subregimes). Considering the combined effect of the surface tension effect of SALT and Laplace pressure, a novel model has been developed to predict the contact size r(t) as a function of time. The nice agreement between this model and our experiments reconfirms that the surface tension effect and Laplace pressure prevail over the hydrostatic pressure.
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Park J, Ryu J, Lee SJ. Penetration of a bubble through porous membranes with different wettabilities. SOFT MATTER 2019; 15:5819-5826. [PMID: 31184354 DOI: 10.1039/c9sm00754g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Porous structures with various surface wettabilities have been used to handle gas bubbles underwater for practical applications, such as separation, collection, detachment, and migration of the bubbles. Despite the increasing interest in porous structures, the effects of surface wettability on the behaviors of bubbles at porous surfaces have not been fully understood. Herein, we aim to examine the entire dynamics from collision to disappearance of a bubble through a porous membrane with different surface wettabilities. We divided the dynamics into three stages based on the characteristic behaviors such as bubble bouncing and contact line variation. Bubble dynamics is dominated by the existence of air layers covering the membrane surface. Bubbles on hydrophilic and hydrophobic membranes, which do not retain air layer, show the same removal pattern; they bounce on the surfaces, and then penetrate the membranes with pinned and moving contact line in sequence. In contrast, bubbles immediately penetrate the superhydrophobic membrane following the spread along the air layer. The characteristic time for bubble removal depends on the wettability, which affects the membrane permeability. The experimental characterization and theoretical analysis achieved in this work would improve the physical understanding of bubble dynamics on porous membranes and allow a proper design in bubble-related applications.
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Affiliation(s)
- JooYoung Park
- Department of Mechanical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Korea.
| | - Jeongeun Ryu
- Department of Mechanical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Korea.
| | - Sang Joon Lee
- Department of Mechanical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Korea.
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Liu Z, Zhang H, Han Y, Huang L, Chen Y, Liu J, Wang X, Liu X, Ling S. Superaerophilic Wedge-Shaped Channels with Precovered Air Film for Efficient Subaqueous Bubbles/Jet Transportation and Continuous Oxygen Supplementation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:23808-23814. [PMID: 31252508 DOI: 10.1021/acsami.9b08085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Pumpless and directed gas transportation in aqueous environments has promising application prospects in various domains. So far, researches on gas transportation based on superaerophilic channels are limited to the transportation of fewer bubbles with low transportation velocity. How to enhance the transportation velocity and realize the transportation of a large quantity of bubbles (especially for gas jet) for practical applications remain unclear. Here, a half-open wedge-shaped channel with subaqueous superaerophilicity is fabricated, which demonstrates excellent bubble affinity and can realize the pumpless and directed bubble transportation. It is proposed that a Laplace force is the main driving force during the transportation and the magnitude of the force is influenced by both the wedge angle of the channel and geometric parameters of the bubble whereas the direction of the force is determined by the orientation of the channel. By applying a precovered air film on the subaqueous superaerophilic wedge-shaped channel, bubbles demonstrate a higher transportation velocity. Additionally, the prepared channel shows an outstanding affinity to oxygen jet at high flux, which can be utilized to transport oxygen for continuous subaqueous oxygen supplementation.
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Affiliation(s)
- Ziai Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Heng Zhang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Yuqi Han
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Liu Huang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Yang Chen
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Jiyu Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Xuyue Wang
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Xin Liu
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
| | - Siying Ling
- Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education , Dalian University of Technology , Dalian 116024 , P. R. China
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14
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Moraila CL, Montes Ruiz-Cabello FJ, Cabrerizo-Vílchez M, Rodríguez-Valverde MÁ. Wetting transitions on rough surfaces revealed with captive bubble experiments. The role of surface energy. J Colloid Interface Sci 2018; 539:448-456. [PMID: 30605814 DOI: 10.1016/j.jcis.2018.12.084] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 12/21/2018] [Accepted: 12/22/2018] [Indexed: 10/27/2022]
Abstract
HYPOTHESIS Wettability of solid surfaces is mostly probed with sessile drops rather than bubbles because this method is readily followed out. This recurrent use may lead to a misleading connection of certain phenomena to the hydrophobicity/hydrophilicity of materials. For instance, the Cassie-Baxter regime and the wicking effect are generally associated only to hydrophobic and hydrophilic surfaces, respectively. However, the same phenomenology should be observed when air bubbles (underwater conditions) in contact with solid surfaces are used instead. In particular, one might expect that rough-hydrophilic surfaces become superaerophobic due to the appearance of a hybrid dewetting regime, like the Cassie-Baxter regime described for rough-hydrophobic surfaces. Otherwise, rough-hydrophobic surfaces might become superaerophilic due to air-wicking. EXPERIMENTS To elucidate this issue, in this work, we analyzed the wettability of surfaces with very different intrinsic contact angle and roughness degree. The analysis was performed with both Sessile Drop and Captive Bubble methods. FINDINGS Our results with captive bubbles for rough-hydrophilic surfaces revealed phenomena only explained by the occurrence of a transition from the Wenzel regime to an "inverse" Cassie-Baxter regime. In addition, our results with captive bubbles for rough-hydrophobic surfaces showed evidences of air percolation through the interconnected asperities. This effect reminds the wicking effect reproduced on rough-hydrophilic surfaces, responsible for superhydrophilicity.
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Affiliation(s)
- Carmen Lucía Moraila
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain.
| | - F Javier Montes Ruiz-Cabello
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain.
| | - Miguel Cabrerizo-Vílchez
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain.
| | - Miguel Ángel Rodríguez-Valverde
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain.
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15
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Huang C, Guo Z. The wettability of gas bubbles: from macro behavior to nano structures to applications. NANOSCALE 2018; 10:19659-19672. [PMID: 30335112 DOI: 10.1039/c8nr07315e] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In recent years, various interfaces related to bubble wettability have been fabricated, which have already been widely applied in various disciplines and fields. Therefore, to better research and understand the wettability of gas bubbles, recent progress with interfaces and wettability of bubbles in aqueous media, including superaerophilicity and superaerophobicity, is summarized. Many biological interfaces which exhibit marvelous characteristics are discussed for reference. Because of the similar behavior between gas bubbles in aqueous media and droplets in air, the two wetting conditions are compared together to better illustrate theories of gas bubble wettability. Based on these theories, effective and available manipulation of gas bubbles' wettability provides a novel idea and method to solve practical problems in various aspects, i.e., superaerophobic electrodes for gas evolution reactions, superaerophilic electrodes for gas compensation reactions, superaerophilic interfaces for directional collection and transportation of gas bubbles, and so on.
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Affiliation(s)
- Can Huang
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China. and State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Zhiguang Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China. and 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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16
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Panchanathan D, Rajappan A, Varanasi KK, McKinley GH. Plastron Regeneration on Submerged Superhydrophobic Surfaces Using In Situ Gas Generation by Chemical Reaction. ACS APPLIED MATERIALS & INTERFACES 2018; 10:33684-33692. [PMID: 30184437 DOI: 10.1021/acsami.8b12471] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superhydrophobic surfaces submerged under water appear shiny due to total internal reflection of light from a thin layer of air (plastron) trapped in their surface texture. This entrapped air is advantageous for frictional drag reduction in various applications ranging from microfluidic channels to marine vessels. However, these aerophilic textures are prone to impregnation by water due to turbulent pressure fluctuations from external flows and dissolution of the trapped gas into the water. We demonstrate a novel chemical method to replenish the plastron in situ by using the decomposition reaction of hydrogen peroxide on superhydrophobic surfaces prepared with a catalytic coating. We also provide a thermodynamic framework for designing superhydrophobic surfaces with optimal texture and chemistry for underwater plastron regeneration. We finally demonstrate the practical utility of this method by fabricating periodic microtextures on aluminum surfaces that incorporate a cheap catalyst, manganese dioxide. We perform drag-reduction experiments under turbulent flow conditions in a Taylor-Couette cell (TC cell), which show that more than half of the drag increase ensuing from plastron collapse can be recovered spontaneously by injection of dilute H2O2 into the TC cell. Thus, we present a low-cost, scalable method to enable in situ plastron regeneration on large surfaces for marine applications.
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Affiliation(s)
- Divya Panchanathan
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Anoop Rajappan
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Kripa K Varanasi
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Gareth H McKinley
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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17
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Delannoy J, de Maleprade H, Clanet C, Quéré D. Capillary descent. SOFT MATTER 2018; 14:5364-5368. [PMID: 29850720 DOI: 10.1039/c8sm00453f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A superhydrophobic capillary tube immersed in water and brought in contact with the bath surface will be invaded by air, owing to its aerophilicity. We discuss this phenomenon where the ingredients of classical capillary rise are inverted, which leads to noticeable dynamical features. (1) The main regime of air invasion is linear in time, due to the viscous resistance of water. (2) Menisci in tubes with millimetre-size radii strongly oscillate before reaching their equilibrium depth, a consequence of inertia. On the whole, capillary descent provides a broad variety of dynamics where capillary effects, viscous friction and liquid inertia all play a role.
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Affiliation(s)
- Joachim Delannoy
- Physique & Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI, 75005 Paris, France
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18
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Cao M, Li Z, Ma H, Geng H, Yu C, Jiang L. Is Superhydrophobicity Equal to Underwater Superaerophilicity: Regulating the Gas Behavior on Superaerophilic Surface via Hydrophilic Defects. ACS APPLIED MATERIALS & INTERFACES 2018; 10:20995-21000. [PMID: 29845857 DOI: 10.1021/acsami.8b05410] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superhydrophobic surfaces have long been considered as superaerophilic surfaces while being placed in the aqueous environment. However, versatile gas/solid interacting phenomena were reported by utilizing different superhydrophobic substrates, indicating that these two wetting states cannot be simply equated. Herein, we demonstrate how the hydrophilic defects on the superhydrophobic track manipulate the underwater gas delivery, without deteriorating the water repellency of the surface in air. The versatile gas-transporting processes can be achieved on the defected superhydrophobic surfaces; on the contrary, in air, a water droplet is able to roll on those surfaces indistinguishably. Results show that the different media pressures applied on the two wetting states determine the diversified fluid-delivering phenomena; that is, the pressure-induced hydrophilic defects act as a gas barrier to regulate the bubble motion behavior under water. Through the rational incorporation of hydrophilic defects, a series of gas-transporting behaviors are achieved purposively, for example, gas film delivery, bubble transporting, and anisotropic bubble gating, which proves the feasibility of this underwater air-controlling strategy.
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Affiliation(s)
- Moyuan Cao
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering , Tianjin University , Tianjin 300072 , China
| | - Zhe Li
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering , Tianjin University , Tianjin 300072 , China
| | - Hongyu Ma
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100191 , China
| | - Hui Geng
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering , Tianjin University , Tianjin 300072 , China
| | - Cunming Yu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100191 , China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100191 , China
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19
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Yu C, Zhang P, Wang J, Jiang L. Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1703053. [PMID: 28902967 DOI: 10.1002/adma.201703053] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 07/17/2017] [Indexed: 06/07/2023]
Abstract
Gas bubbles in aqueous media are common and inevitable in, for example, agriculture and industrial processes. The behaviors of gas bubbles on solid interfaces, including generation, growth, coalescence, release, transport, and collection, are crucial to gas-bubble-related applications, which are always determined by gas-bubble wettability on solid interfaces. Here, the recent progress regarding the study of interfaces with gas-bubble superwettability in aqueous media, i.e., superaerophilicity and superaerophobicity, is summarized. Some examples illustrate how to design microstructures and chemical compositions to achieve reliable and effective manipulation of gas-bubble wettability on artificial interfaces. These designed interfaces exhibit excellent performance in gas-evolution reactions, gas-adsorption reactions, and directional gas-bubble transportation. Moreover, progress in the theoretical investigation of gas-bubble superwettability is reported. Lastly, some challenges are presented, such as the reliable manipulation of gas-bubble wettability and the establishment of mature theory for exactly and systematically explaining gas-bubble wetting phenomena.
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Affiliation(s)
- Cunming Yu
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Peipei Zhang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Jingming Wang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Lei Jiang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, P. R. China
- Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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