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Backholm M, Kärki T, Nurmi HA, Vuckovac M, Turkki V, Lepikko S, Jokinen V, Quéré D, Timonen JVI, Ras RHA. Toward vanishing droplet friction on repellent surfaces. Proc Natl Acad Sci U S A 2024; 121:e2315214121. [PMID: 38621127 PMCID: PMC11047067 DOI: 10.1073/pnas.2315214121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 03/08/2024] [Indexed: 04/17/2024] Open
Abstract
Superhydrophobic surfaces are often seen as frictionless materials, on which water is highly mobile. Understanding the nature of friction for such water-repellent systems is central to further minimize resistance to motion and energy loss in applications. For slowly moving drops, contact-line friction has been generally considered dominant on slippery superhydrophobic surfaces. Here, we show that this general rule applies only at very low speed. Using a micropipette force sensor in an oscillating mode, we measure the friction of water drops approaching or even equaling zero contact-line friction. We evidence that dissipation then mainly stems from the viscous shearing of the air film (plastron) trapped under the liquid. Because this force is velocity dependent, it can become a serious drag on surfaces that look highly slippery from quasi-static tests. The plastron thickness is found to be the key parameter that enables the control of this special friction, which is useful information for designing the next generation of ultraslippery water-repellent coatings.
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Affiliation(s)
- Matilda Backholm
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Tytti Kärki
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Heikki A. Nurmi
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Maja Vuckovac
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Valtteri Turkki
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Sakari Lepikko
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Ville Jokinen
- Department of Chemistry and Materials Science, Aalto University, Espoo02150, Finland
| | - David Quéré
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, Paris Sciences Lettres Research University, Ecole Supérieure de Physique et Chimie Industrielles, Paris75005, France
| | - Jaakko V. I. Timonen
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
| | - Robin H. A. Ras
- Department of Applied Physics, Aalto University, Espoo02150, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials, Aalto University, Espoo02150, Finland
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2
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Lu Z, Tenjimbayashi M, Zhou J, Nakanishi J. Ultimately Adaptive Fluid Interfacial Phospholipid Membranes Unveiled Unanticipated High Cellular Mechanical Work. Adv Mater 2024:e2403396. [PMID: 38613213 DOI: 10.1002/adma.202403396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Indexed: 04/14/2024]
Abstract
Living cells actively interact biochemically and mechanically with the surrounding extracellular matrices (ECMs) and undergo dramatic morphological and dimensional transitions, concomitantly remodeling ECMs. However, there is no suitable method to quantitatively discuss the contribution of mechanical interactions in such mutually adaptive processes. Herein, a highly deformable "living" cellular scaffold is developed to evaluate overall mechanical energy transfer between cell and ECMs. It is based on the water-perfluorocarbon interface decorated with phospholipids bearing a cell-adhesive ligand and fluorescent tag. The bioinert nature of the phospholipid membranes prevents the formation of solid-like protein nanofilms at the fluid interface, enabling to visualize and quantify cellular mechanical work against the ultimately adaptive model ECM. A new cellular wetting regime is identified, wherein interface deformation proceeds to cell flattening, followed by its eventual restoration. The cellular mechanical work during this adaptive wetting process is one order of magnitude higher than those reported with conventional elastic platforms. The behavior of viscous liquid drops at the air-water interface can simulate cellular adaptive wetting, suggesting that overall viscoelasticity of the cell body predominates the emergent wetting regime and regulates mechanical output. Cellular-force-driven high-energy states on the adaptive platform can be useful for cell fate manipulation.
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Affiliation(s)
- Zhou Lu
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Mizuki Tenjimbayashi
- Research Center for Materials Nanoarchitectonics (MANA), NIMS, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Junhong Zhou
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Jun Nakanishi
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
- Graduate School of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
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3
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Mangiarotti A, Aleksanyan M, Siri M, Sun TW, Lipowsky R, Dimova R. Photoswitchable Endocytosis of Biomolecular Condensates in Giant Vesicles. Adv Sci (Weinh) 2024:e2309864. [PMID: 38582523 DOI: 10.1002/advs.202309864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/14/2024] [Indexed: 04/08/2024]
Abstract
Interactions between membranes and biomolecular condensates can give rise to complex phenomena such as wetting transitions, mutual remodeling, and endocytosis. In this study, light-triggered manipulation of condensate engulfment is demonstrated using giant vesicles containing photoswitchable lipids. UV irradiation increases the membrane area, which can be stored in nanotubes. When in contact with a condensate droplet, the UV light triggers rapid condensate endocytosis, which can be reverted by blue light. The affinity of the protein-rich condensates to the membrane and the reversibility of the engulfment processes is quantified from confocal microscopy images. The degree of photo-induced engulfment, whether partial or complete, depends on the vesicle excess area and the relative sizes of vesicles and condensates. Theoretical estimates suggest that utilizing the light-induced excess area to increase the vesicle-condensate adhesion interface is energetically more favorable than the energy gain from folding the membrane into invaginations and tubes. The overall findings demonstrate that membrane-condensate interactions can be easily and quickly modulated via light, providing a versatile system for building platforms to control cellular events and design intelligent drug delivery systems for cell repair.
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Affiliation(s)
- Agustín Mangiarotti
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
| | - Mina Aleksanyan
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
- Institute for Chemistry and Biochemistry, Free University of Berlin, Takustraße 3, 14195, Berlin, Germany
| | - Macarena Siri
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
- Max Planck Queensland Centre, Science Park Golm, 14476, Potsdam, Germany
| | - Tsu-Wang Sun
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
| | - Reinhard Lipowsky
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
| | - Rumiana Dimova
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14476, Potsdam, Germany
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4
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Lepikko S, Jaques YM, Junaid M, Backholm M, Lahtinen J, Julin J, Jokinen V, Sajavaara T, Sammalkorpi M, Foster AS, Ras RHA. Droplet slipperiness despite surface heterogeneity at molecular scale. Nat Chem 2024; 16:506-513. [PMID: 37872419 PMCID: PMC10997520 DOI: 10.1038/s41557-023-01346-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 09/15/2023] [Indexed: 10/25/2023]
Abstract
Friction determines whether liquid droplets slide off a solid surface or stick to it. Surface heterogeneity is generally acknowledged as the major cause of increased contact angle hysteresis and contact line friction of droplets. Here we challenge this long-standing premise for chemical heterogeneity at the molecular length scale. By tuning the coverage of self-assembled monolayers (SAMs), water contact angles change gradually from about 10° to 110° yet contact angle hysteresis and contact line friction are low for the low-coverage hydrophilic SAMs as well as high-coverage hydrophobic SAMs. Their slipperiness is not expected based on the substantial chemical heterogeneity of the SAMs featuring uncoated areas of the substrate well beyond the size of a water molecule as probed by metal reactants. According to molecular dynamics simulations, the low friction of both low- and high-coverage SAMs originates from the mobility of interfacial water molecules. These findings reveal a yet unknown and counterintuitive mechanism for slipperiness, opening new avenues for enhancing the mobility of droplets.
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Affiliation(s)
- Sakari Lepikko
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Ygor Morais Jaques
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
| | - Muhammad Junaid
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Matilda Backholm
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Jouko Lahtinen
- Department of Applied Physics, Aalto University, Espoo, Finland
| | - Jaakko Julin
- Department of Physics, University of Jyväskylä, Jyväskylä, Finland
| | - Ville Jokinen
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
| | - Timo Sajavaara
- Department of Physics, University of Jyväskylä, Jyväskylä, Finland
| | - Maria Sammalkorpi
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
- Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland
| | - Adam S Foster
- Department of Applied Physics, Aalto University, Espoo, Finland
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa, Japan
| | - Robin H A Ras
- Department of Applied Physics, Aalto University, Espoo, Finland.
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland.
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5
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Lepikko S, Jaques YM, Junaid M, Backholm M, Lahtinen J, Julin J, Jokinen V, Sajavaara T, Sammalkorpi M, Foster AS, Ras RHA. Publisher Correction: Droplet slipperiness despite surface heterogeneity at molecular scale. Nat Chem 2024; 16:666. [PMID: 38017209 PMCID: PMC10997497 DOI: 10.1038/s41557-023-01401-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Affiliation(s)
- Sakari Lepikko
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Ygor Morais Jaques
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
| | - Muhammad Junaid
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Matilda Backholm
- Department of Applied Physics, Aalto University, Espoo, Finland
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
| | - Jouko Lahtinen
- Department of Applied Physics, Aalto University, Espoo, Finland
| | - Jaakko Julin
- Department of Physics, University of Jyväskylä, Jyväskylä, Finland
| | - Ville Jokinen
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
| | - Timo Sajavaara
- Department of Physics, University of Jyväskylä, Jyväskylä, Finland
| | - Maria Sammalkorpi
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland
- Department of Chemistry and Materials Science, Aalto University, Espoo, Finland
- Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland
| | - Adam S Foster
- Department of Applied Physics, Aalto University, Espoo, Finland
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa, Japan
| | - Robin H A Ras
- Department of Applied Physics, Aalto University, Espoo, Finland.
- Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, Espoo, Finland.
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6
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Tang Z, Yang D, Guo H, Lin S, Wang ZL. Spontaneous Wetting Induced by Contact-Electrification at Liquid-Solid Interface. Adv Mater 2024:e2400451. [PMID: 38529563 DOI: 10.1002/adma.202400451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 03/08/2024] [Indexed: 03/27/2024]
Abstract
Wettability significantly influences various surface interactions and applications at the liquid-solid interface. However, the understanding is complicated by the intricate charge exchange occurring through contact electrification (CE) during this process. The understanding of the influence of triboelectric charge on wettability remains challenging, especially due to the complexities involved in concurrently measuring contact angles and interfacial electrical signals. Here, the relationship is investigated between surface charge density and change of contact angle of dielectric films after contact with water droplets. It is observed that the charge exchange when water spared lead to a spontaneous wetting phenomenon, which is termed as the contact electrification induced wetting (CEW). Notably, these results demonstrate a linear dependence between the change of contact angle (CA) of the materials and the density of surface charge on the solid surface. Continuous CEW tests show that not only the static CA but also the dynamics of wetting are influenced by the accumulation charges at the interface. The mechanism behind CEW involves the redistribution of surface charges on a solid surface and polar water molecules within liquid. This interaction results in a decrease in interface energy, leading to a reduction in the CA. Ab initio calculations suggest that the reduction in interface energy may stem from the enhanced surface charge on the substrate, which strengthens the hydrogen bond interaction between water and the substrate. These findings have the potential to advance the understanding of CE and wetting phenomena, with applications in energy harvesting, catalysis, and droplet manipulation at liquid-solid interfaces.
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Affiliation(s)
- Zhen Tang
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Dan Yang
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hengyu Guo
- Department of Physics, Chongqing University, Chongqing, 400044, China
| | - Shiquan Lin
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhong Lin Wang
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- School of Materials Science and Engineering, Georgia Institute of Technology, Georgia, Atlanta, 30332-0245, USA
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7
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Dai Y, Li M, Ji B, Wang X, Yang S, Yu P, Wang S, Hao C, Wang Z. Author Correction: Liquid metal droplets bouncing higher on thicker water layer. Nat Commun 2024; 15:2086. [PMID: 38453998 PMCID: PMC10920624 DOI: 10.1038/s41467-024-46487-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024] Open
Affiliation(s)
- Yuhang Dai
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
- Department of Mechanical and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Minfei Li
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Bingqiang Ji
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Xiong Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Siyan Yang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Peng Yu
- Department of Mechanical and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China.
| | - Chonglei Hao
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, 518055, China.
| | - Zuankai Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China.
- Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, 999077, China.
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8
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Li P, Huang X, Zhao YP. Author Correction: Electro-capillary peeling of thin films. Nat Commun 2024; 15:1959. [PMID: 38438366 PMCID: PMC10912737 DOI: 10.1038/s41467-024-46369-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024] Open
Affiliation(s)
- Peiliu Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
| | - Xianfu Huang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
| | - Ya-Pu Zhao
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China.
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9
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Yan X, Au SCY, Chan SC, Chan YL, Leung NC, Wu WY, Sin DT, Zhao G, Chung CHY, Mei M, Yang Y, Qiu H, Yao S. Unraveling the role of vaporization momentum in self-jumping dynamics of freezing supercooled droplets at reduced pressures. Nat Commun 2024; 15:1567. [PMID: 38378825 PMCID: PMC10879204 DOI: 10.1038/s41467-024-45928-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 02/06/2024] [Indexed: 02/22/2024] Open
Abstract
Supercooling of water complicates phase change dynamics, the understanding of which remains limited yet vital to energy-related and aerospace processes. Here, we investigate the freezing and jumping dynamics of supercooled water droplets on superhydrophobic surfaces, induced by a remarkable vaporization momentum, in a low-pressure environment. The vaporization momentum arises from the vaporization at droplet's free surface, progressed and intensified by recalescence, subsequently inducing droplet compression and finally self-jumping. By incorporating liquid-gas-solid phase changes involving vaporization, freezing recalescence, and liquid-solid interactions, we resolve the vaporization momentum and droplet dynamics, revealing a size-scaled jumping velocity and a nucleation-governed jumping direction. A droplet-size-defined regime map is established, distinguishing the vaporization-momentum-dominated self-jumping from evaporative drying and overpressure-initiated levitation, all induced by depressurization and vaporization. Our findings illuminate the role of supercooling and low-pressure mediated phase change in shaping fluid transport dynamics, with implications for passive anti-icing, advanced cooling, and climate physics.
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Affiliation(s)
- Xiao Yan
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China.
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing, 400030, China.
- Institute of Engineering Thermophysics, Chongqing University, Chongqing, 400030, China.
| | - Samuel C Y Au
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Sui Cheong Chan
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Ying Lung Chan
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Ngai Chun Leung
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Wa Yat Wu
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Dixon T Sin
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Guanlei Zhao
- State Key Laboratory of Automotive Safety and Energy, School of Vehicle and Mobility, Tsinghua University, Beijing, 100084, China
| | - Casper H Y Chung
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Mei Mei
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Yinchuang Yang
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Huihe Qiu
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China
| | - Shuhuai Yao
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong, China.
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen, China.
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10
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Wang Y, Huang JJ. Wetting and Spreading Behavior of Axisymmetric Compound Droplets on Curved Solid Walls Using Conservative Phase Field Lattice Boltzmann Method. Entropy (Basel) 2024; 26:172. [PMID: 38392427 PMCID: PMC10888434 DOI: 10.3390/e26020172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 02/06/2024] [Accepted: 02/13/2024] [Indexed: 02/24/2024]
Abstract
Compound droplets have received increasing attention due to their applications in many several areas, including medicine and materials. Previous works mostly focused on compound droplets on planar surfaces and, as such, the effects of curved walls have not been studied thoroughly. In this paper, the influence of the properties of curved solid wall (including the shape, curvature, and contact angle) on the wetting behavior of compound droplets is explored. The axisymmetric lattice Boltzmann method, based on the conservative phase field formulation for ternary fluids, was used to numerically study the wetting and spreading of a compound droplet of the Janus type on various curved solid walls at large density ratios, focusing on whether the separation of compound droplets occurs. Several types of wall geometries were considered, including a planar wall, a concave wall with constant curvature, and a convex wall with fixed or variable curvature (specifically, a prolate or oblate spheroid). The effects of surface wettability, interfacial angles, and the density ratio (of droplet to ambient fluid) on the wetting process were also explored. In general, it was found that, under otherwise identical conditions, droplet separation tends to happen more likely on more hydrophilic walls, under larger interfacial angles (measured inside the droplet), and at larger density ratios. On convex walls, a larger radius of curvature of the surface near the droplet was found to be helpful to split the Janus droplet. On concave walls, as the radius of curvature increases from a small value, the possibility to observe droplet separation first increases and then decreases. Several phase diagrams on whether droplet separation occurs during the spreading process were produced for different kinds of walls to illustrate the influences of various factors.
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Affiliation(s)
- Yue Wang
- College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
| | - Jun-Jie Huang
- College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
- Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China
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11
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Cui Z, Zhang Y, Zhang Z, Liu B, Chen Y, Wu H, Zhang Y, Cheng Z, Li G, Yong J, Li J, Wu D, Chu J, Hu Y. Durable Janus membrane with on-demand mode switching fabricated by femtosecond laser. Nat Commun 2024; 15:1443. [PMID: 38365791 PMCID: PMC10873403 DOI: 10.1038/s41467-024-45926-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 02/05/2024] [Indexed: 02/18/2024] Open
Abstract
Despite their notable unidirectional water transport capabilities, Janus membranes are commonly challenged by the fragility of their chemical coatings and the clogging of open microchannels. Here, an on-demand mode-switching strategy is presented to consider the Janus functionality and mechanical durability separately and implement them by simply stretching and releasing the membrane. The stretching Janus mode facilitates unidirectional liquid flow through the hydrophilic micropores-microgrooves channels (PG channels) fabricated by femtosecond laser. The releasing protection mode is designed for the in-situ closure of the PG channels upon encountering external abrasion and impact. The protection mode imparts the Janus membrane robustness to reserve water unidirectional penetration under harsh conditions, such as 2000 cycles mechanical abrasion, 10 days exposure in air and other rigorous tests (sandpaper abrasion, finger rubbing, sand impact and tape peeling). The underlying mechanism of gridded grooves in protecting and enhancing water flow is unveiled. The Janus membrane serves as a fog collector to demonstrate its unwavering mechanical durability in harsh real-world conditions. The presented design strategy could open up new possibilities of Janus membrane in a multitude of applications ranging from multiphase separation devices to fog harvesting and wearable health-monitoring patches.
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Affiliation(s)
- Zehang Cui
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
- School of Manufacture Science and Engineering, Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Yachao Zhang
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
- Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Zhicheng Zhang
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Bingrui Liu
- Key Laboratory of Agri-Food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui, 230036, China
| | - Yiyu Chen
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
- School of Manufacture Science and Engineering, Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Hao Wu
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Yuxuan Zhang
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Zilong Cheng
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Guoqiang Li
- School of Manufacture Science and Engineering, Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Jiale Yong
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Jiawen Li
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Jiaru Chu
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behavior 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, 230027, China.
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12
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Nguyen TM, Pombubpa N, Huntemann M, Clum A, Foster B, Foster B, Roux S, Palaniappan K, Varghese N, Mukherjee S, Reddy TBK, Daum C, Copeland A, Chen IMA, Ivanova NN, Kyrpides NC, Harmon-Smith M, Eloe-Fadrosh EA, Pietrasiak N, Stajich JE, Hom EFY. Metatranscriptomes of two biological soil crust types from the Mojave desert in response to wetting. Microbiol Resour Announc 2024; 13:e0108023. [PMID: 38189307 PMCID: PMC10868201 DOI: 10.1128/mra.01080-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 12/13/2023] [Indexed: 01/09/2024] Open
Abstract
We present eight metatranscriptomic datasets of light algal and cyanolichen biological soil crusts from the Mojave Desert in response to wetting. These data will help us understand gene expression patterns in desert biocrust microbial communities after they have been reactivated by the addition of water.
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Affiliation(s)
- Thuy M. Nguyen
- Department of Biology and Center for Biodiversity and Conservation Research, University, University of Mississippi, Mississippi, USA
| | - Nuttapon Pombubpa
- Department of Microbiology and Plant Pathology, University of California, Riverside, California, USA
| | - Marcel Huntemann
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Alicia Clum
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Brian Foster
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Bryce Foster
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Simon Roux
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Krishnaveni Palaniappan
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Neha Varghese
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Supratim Mukherjee
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - T. B. K. Reddy
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Chris Daum
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Alex Copeland
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - I-Min A. Chen
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Natalia N. Ivanova
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Nikos C. Kyrpides
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Miranda Harmon-Smith
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Emiley A. Eloe-Fadrosh
- US Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
| | - Nicole Pietrasiak
- School of Life Sciences, University of Nevada-Las Vegas, Las Vegas, Nevada, USA
| | - Jason E. Stajich
- Department of Microbiology and Plant Pathology, University of California, Riverside, California, USA
| | - Erik F. Y. Hom
- Department of Biology and Center for Biodiversity and Conservation Research, University, University of Mississippi, Mississippi, USA
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13
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Zhuo J, Rui Z, Lyu X, He D, Ding S, Sun H, Dong Y. The effect of crystallographic orientation of α-Al 2O 3on the wetting behavior and adhesion characteristics of aluminum droplets. J Phys Condens Matter 2024; 36:195001. [PMID: 38295435 DOI: 10.1088/1361-648x/ad24bc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 01/31/2024] [Indexed: 02/02/2024]
Abstract
To solve the problem of adhesion of aluminum fluid to the inner wall of the vacuum ladle in the aluminum electrolysis industry, molecular dynamics simulation is performed to research the wetting behavior of Al droplets on the surfaces of theα-Al2O3substrates C (0001), M (11-00), and R (11-02) at 1073 K. Meanwhile, the adhesion characteristics of the Al droplet are evaluated by the potential of the mean force (PMF) for the separation of the Al droplets from different surfaces of theα-Al2O3substrate. The results show that the wetting behavior of Al droplets on theα-Al2O3substrate is influenced by the different crystallographic orientations. The diffusion of Al droplets in thex-o-yplane of the substrate exhibits isotropic. The PMF and the interfacial potential energy reveal that the magnitude of the adhesion work in the solid-liquid separation of Al droplets fromα-Al2O3substrates follows the order C (0001) > R (11-02) > M (11-00). These findings characterize the wetting properties and adhesion behavior of Al droplets on an atomic scale and provide a theoretical basis for the selection of materials for the inner wall of the vacuum ladle.
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Affiliation(s)
- Junting Zhuo
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Zhiyuan Rui
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Xin Lyu
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Dongyun He
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Simin Ding
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Huaming Sun
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
| | - Yun Dong
- School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, People's Republic of China
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14
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Wu SJ, Wu J, Kaser SJ, Roh H, Shiferaw RD, Yuk H, Zhao X. A 3D printable tissue adhesive. Nat Commun 2024; 15:1215. [PMID: 38331971 PMCID: PMC10853267 DOI: 10.1038/s41467-024-45147-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 01/15/2024] [Indexed: 02/10/2024] Open
Abstract
Tissue adhesives are promising alternatives to sutures and staples for joining tissues, sealing defects, and immobilizing devices. However, existing adhesives mostly take the forms of glues or hydrogels, which offer limited versatility. We report a direct-ink-write 3D printable tissue adhesive which can be used to fabricate bioadhesive patches and devices with programmable architectures, unlocking new potential for application-specific designs. The adhesive is conformable and stretchable, achieves robust adhesion with wet tissues within seconds, and exhibits favorable biocompatibility. In vivo rat trachea and colon defect models demonstrate the fluid-tight tissue sealing capability of the printed patches, which maintained adhesion over 4 weeks. Moreover, incorporation of a blood-repelling hydrophobic matrix enables the printed patches to seal actively bleeding tissues. Beyond wound closure, the 3D printable adhesive has broad applicability across various tissue-interfacing devices, highlighted through representative proof-of-concept designs. Together, this platform offers a promising strategy toward developing advanced tissue adhesive technologies.
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Affiliation(s)
- Sarah J Wu
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Jingjing Wu
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Samuel J Kaser
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Heejung Roh
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Ruth D Shiferaw
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Hyunwoo Yuk
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
- SanaHeal, Inc., Cambridge, MA, USA.
| | - Xuanhe Zhao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
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15
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Jiang J, Shen Y, Xu Y, Wang Z, Tao J, Liu S, Liu W, Chen H. An energy-free strategy to elevate anti-icing performance of superhydrophobic materials through interfacial airflow manipulation. Nat Commun 2024; 15:777. [PMID: 38278811 PMCID: PMC10817900 DOI: 10.1038/s41467-024-45078-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 01/15/2024] [Indexed: 01/28/2024] Open
Abstract
Superhydrophobic surfaces demonstrate excellent anti-icing performance under static conditions. However, they show a marked decrease in icing time under real flight conditions. Here we develop an anti-icing strategy using ubiquitous wind field to improve the anti-icing efficiency of superhydrophobic surfaces during flight. We find that the icing mass on hierarchical superhydrophobic surface with a microstructure angle of 30° is at least 40% lower than that on the conventional superhydrophobic plate, which is attributed to the combined effects of microdroplet flow upwelling induced by interfacial airflow and microdroplet ejection driven by superhydrophobic characteristic. Meanwhile, the disordered arrangement of water molecules induced by the specific 30° angle also raises the energy barriers required for nucleation, resulting in an inhibition of the nucleation process. This strategy of microdroplet movement manipulation induced by interfacial airflow is expected to break through the anti-icing limitation of conventional superhydrophobic materials in service conditions and can further reduce the risk of icing on the aircraft surface.
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Affiliation(s)
- Jiawei Jiang
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China
| | - Yizhou Shen
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China.
| | - Yangjiangshan Xu
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China
| | - Zhen Wang
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China
| | - Jie Tao
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China.
| | - Senyun Liu
- key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, 6 Erhuan South Rd., Mianyang, 621000, PR China
| | - Weilan Liu
- State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, 210016, China
- Institute of Advanced Materials, Nanjing Tech University, 30 Puzhu South Rd., Nanjing, 210009, PR China
| | - Haifeng Chen
- Department of Materials Chemistry, Qiuzhen School, Huzhou University, 759# East 2nd Road, Huzhou, 313000, PR China
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16
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Li S, Lam CWE, Donati M, Regulagadda K, Yavuz E, Pfeiffer T, Sarkiris P, Gogolides E, Milionis A, Poulikakos D, Butt HJ, Kappl M. Durable, Ultrathin, and Antifouling Polymer Brush Coating for Efficient Condensation Heat Transfer. ACS Appl Mater Interfaces 2024; 16:1941-1949. [PMID: 38115194 PMCID: PMC10788830 DOI: 10.1021/acsami.3c17293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 11/28/2023] [Accepted: 11/28/2023] [Indexed: 12/21/2023]
Abstract
Heat exchangers are made of metals because of their high heat conductivity and mechanical stability. Metal surfaces are inherently hydrophilic, leading to inefficient filmwise condensation. It is still a challenge to coat these metal surfaces with a durable, robust, and thin hydrophobic layer, which is required for efficient dropwise condensation. Here, we report the nonstructured and ultrathin (∼6 nm) polydimethylsiloxane (PDMS) brushes on copper that sustain high-performing dropwise condensation in high supersaturation. Due to the flexible hydrophobic siloxane polymer chains, the coating has low resistance to drop sliding and excellent chemical stability. The PDMS brushes can sustain dropwise condensation for up to ∼8 h during exposure to 111 °C saturated steam flowing at 3 m·s-1, with a 5-7 times higher heat transfer coefficient compared to filmwise condensation. The surface is self-cleaning and can reduce the level of bacterial attachment by 99%. This low-cost, facile, fluorine-free, and scalable method is suitable for a great variety of heat transfer applications.
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Affiliation(s)
- Shuai Li
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Cheuk Wing Edmond Lam
- Department
of Mechanical and Process Engineering, Laboratory of Thermodynamics
in Emerging Technologies, ETH Zurich, 8092 Zurich, Switzerland
| | - Matteo Donati
- Department
of Mechanical and Process Engineering, Laboratory of Thermodynamics
in Emerging Technologies, ETH Zurich, 8092 Zurich, Switzerland
| | - Kartik Regulagadda
- Department
of Mechanical and Process Engineering, Laboratory of Thermodynamics
in Emerging Technologies, ETH Zurich, 8092 Zurich, Switzerland
| | - Emre Yavuz
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Till Pfeiffer
- Institute
for Technical Thermodynamics, Technical
University of Darmstadt, 64287 Darmstadt, Germany
| | - Panagiotis Sarkiris
- Institute
of Nanoscience and Nanotechnology, NCSR
“Demokritos”, 15341Agia Paraskevi, Attiki, Greece
| | - Evangelos Gogolides
- Institute
of Nanoscience and Nanotechnology, NCSR
“Demokritos”, 15341Agia Paraskevi, Attiki, Greece
| | - Athanasios Milionis
- Department
of Mechanical and Process Engineering, Laboratory of Thermodynamics
in Emerging Technologies, ETH Zurich, 8092 Zurich, Switzerland
| | - Dimos Poulikakos
- Department
of Mechanical and Process Engineering, Laboratory of Thermodynamics
in Emerging Technologies, ETH Zurich, 8092 Zurich, Switzerland
| | | | - Michael Kappl
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
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17
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Yang J, Yang X, Yu T, Wang Z. Liquid-infused interfacial floatable porous membrane as movable gate for ultrafast immiscible oil/water separation. Sci Rep 2024; 14:244. [PMID: 38167905 PMCID: PMC10762095 DOI: 10.1038/s41598-023-40262-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 08/08/2023] [Indexed: 01/05/2024] Open
Abstract
Liquid separation methods are widely used in industrial and everyday applications, however, their applicability is often constrained by low efficiency, membrane fouling, and poor energy efficiency. Herein, a conceptually novel liquid-infused interfacial floatable porous membrane (LIIFPM) system for high-performance oil/water separation is proposed. The system functions by allowing a liquid to wet and fill a superamphiphilic porous membrane, thereby creating a stable liquid-infused interface that floats at the oil/water interface and prevents the passage of immiscible liquids. The lower-layer liquid can outflow directly, while the flow of the upper-layer liquid is stopped by the membrane. Remarkably, the efficiency of the LIIFPM system is independent of the membrane pore size, enabling ultrafast immiscible oil/water separation in an energy-saving and antifouling manner.
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Affiliation(s)
- Jianlin Yang
- College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, China.
| | - Xin Yang
- College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, China
| | - Tianlu Yu
- College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, China
- School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China
| | - Zhecun Wang
- College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, China.
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18
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Peng Y, Zhao S, Huang C, Deng F, Liu J, Liu C, Li Y. Superhydrophilic and Underwater Superoleophobic Copper Mesh Coated with Bamboo Cellulose Hydrogel for Efficient Oil/Water Separation. Polymers (Basel) 2023; 16:14. [PMID: 38201679 PMCID: PMC10780632 DOI: 10.3390/polym16010014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/16/2023] [Accepted: 12/17/2023] [Indexed: 01/12/2024] Open
Abstract
Super-wetting interface materials have shown great potential for applications in oil-water separation. Hydrogel-based materials, in particular, have been extensively studied for separating water from oily wastewater due to their unique hydrophilicity and excellent anti-oil effect. In this study, a superhydrophilic and underwater superoleophobic bamboo cellulose hydrogel-coated mesh was fabricated using a feasible and eco-friendly dip-coating method. The process involved dissolving bamboo cellulose in a green alkaline/urea aqueous solvent system, followed by regeneration in ethanol solvent, without the addition of surface modifiers. The resulting membrane exhibited excellent special wettability, with superhydrophilicity and underwater superoleophobicity, enabling oil-water separation through a gravity-driven "water-removing" mode. The super-wetting composite membrane demonstrated a high separation efficiency of higher than 98% and a permeate flux of up to 9168 L·m-2·h-1 for numerous oil/water mixtures. It also maintained a separation efficiency of >95% even after 10 cycles of separation, indicating its long-term stability. This study presents a green, simple, cost-effective, and environmentally friendly approach for fabricating superhydrophilic surfaces to achieve oil-water separation. It also highlights the potential of bamboo-based materials in the field of oil-water separation.
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Affiliation(s)
| | | | | | | | | | - Chunhua Liu
- Engineering Research Center of Jiangxi Province for Bamboo-Based Advanced Materials and Biomass Conversion, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China; (Y.P.); (S.Z.); (C.H.); (F.D.); (J.L.)
| | - Yibao Li
- Engineering Research Center of Jiangxi Province for Bamboo-Based Advanced Materials and Biomass Conversion, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China; (Y.P.); (S.Z.); (C.H.); (F.D.); (J.L.)
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19
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Kovács P, Körömi B, Weltsch Z, Berczeli M. Investigation of the Tensile Strength of Adhesive-Bonded Steels Using Surface Treatments. Materials (Basel) 2023; 16:7663. [PMID: 38138804 PMCID: PMC10744958 DOI: 10.3390/ma16247663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/12/2023] [Accepted: 12/12/2023] [Indexed: 12/24/2023]
Abstract
This study explores the tensile strength of adhesive joints in steel, focusing on the influence of heat treatment and diverse surface modifications. Results indicate a notable relationship between annealing temperature and tensile strength, with the most favorable outcomes identified at 90 min and 165 °C. Particularly, surfaces treated through turning, sandblasting, and plasma treatment (type C) consistently outperformed other methods. A standout revelation emerged from the turned, sandblasted, and plasma-treated surface (C), showcasing an exceptional tensile strength of 69.06 MPa. Load-holding tests underscored its resilience under diverse load conditions. Surface analyses, including roughness measurements, wetting characteristics, and Scanning Electron Microscope imaging, provided valuable insights into structural transformations induced by different treatments. Chemical composition examinations unveiled significant alterations post-plasma treatment, impacting surface chemistry and contributing to an outstanding tensile strength of 67.63 MPa. In essence, this research offers a glimpse into the nuanced factors influencing adhesive joint strength in steel. The turned, sandblasted, and plasma-treated surface emerges as a promising avenue, sparking further curiosity into the underlying mechanisms propelling superior tensile strength in adhesive joints.
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Affiliation(s)
- Péter Kovács
- Doctoral School of Multidisciplinary Engineering Sciences, Szechenyi Istvan University, H-9000 Gyor, Hungary;
- Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, H-6000 Kecskemet, Hungary;
| | - Benjámin Körömi
- Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, H-6000 Kecskemet, Hungary;
| | - Zoltán Weltsch
- Department of Automotive and Railway Engineering, ZalaZONE Innovation Park, Széchenyi István University, H-9000 Gyor, Hungary;
| | - Miklós Berczeli
- Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, H-6000 Kecskemet, Hungary;
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20
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Sharipova A, Zlotver I, Sosnik A, Rabkin E. Solid-State De wetting of Thin Au Films for Surface Functionalization of Biomedical Implants. Materials (Basel) 2023; 16:7524. [PMID: 38138670 PMCID: PMC10744913 DOI: 10.3390/ma16247524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/28/2023] [Accepted: 12/02/2023] [Indexed: 12/24/2023]
Abstract
Biomaterial-centered infections of orthopedic implants remain a significant burden in the healthcare system due to sedentary lifestyles and an aging population. One approach to combat infections and improve implant osteointegration is functionalizing the implant surface with anti-infective and osteoinductive agents. In this framework, Au nanoparticles are produced on the surface of Ti-6Al-4V medical alloy by solid-state dewetting of 5 nm Au film and used as the substrate for the conjugation of a model antibiotic vancomycin via a mono-thiolated poly(ethylene glycol) linker. Produced Au nanoparticles on Ti-6Al-4V surface are equiaxed with a mean diameter 19.8 ± 7.2 nm, which is shown by high-resolution scanning electron microscopy and atomic force microscopy. The conjugation of the antibiotic vancomycin, 18.8 ± 1.3 nm-thick film, is confirmed by high resolution-scanning transmission electron microscopy and X-ray photoelectron spectroscopy. Overall, showing a link between the solid-state dewetting process and surface functionalization, we demonstrate a novel, simple, and versatile method for functionalization of implant surfaces.
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Affiliation(s)
- Aliya Sharipova
- Department of Materials Science and Engineering, Technion–Israel Institute of Technology, Haifa 3200003, Israel; (A.S.); (I.Z.); (A.S.)
- Department of Bio- and Nanotechnology, Fraunhofer Institute for Ceramic Technologies and Systems IKTS, 01277 Dresden, Germany
| | - Ivan Zlotver
- Department of Materials Science and Engineering, Technion–Israel Institute of Technology, Haifa 3200003, Israel; (A.S.); (I.Z.); (A.S.)
| | - Alejandro Sosnik
- Department of Materials Science and Engineering, Technion–Israel Institute of Technology, Haifa 3200003, Israel; (A.S.); (I.Z.); (A.S.)
| | - Eugen Rabkin
- Department of Materials Science and Engineering, Technion–Israel Institute of Technology, Haifa 3200003, Israel; (A.S.); (I.Z.); (A.S.)
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21
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Shah P, Hou Y, Butt HJ, Kappl M. Nanofilament-Coated Superhydrophobic Membranes Show Enhanced Flux and Fouling Resistance in Membrane Distillation. ACS Appl Mater Interfaces 2023; 15:55119-55128. [PMID: 37962333 PMCID: PMC10694809 DOI: 10.1021/acsami.3c12323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/13/2023] [Accepted: 10/25/2023] [Indexed: 11/15/2023]
Abstract
Membrane distillation (MD) is an important technique for brine desalination and wastewater treatment that may utilize waste or solar heat. To increase the distillation rate and minimize membrane wetting and fouling, we deposit a layer of polysiloxane nanofilaments on microporous membranes. In this way, composite membranes with multiscale pore sizes are created. The performance of these membranes in the air gap and direct contact membrane distillation was investigated in the presence of salt solutions, solutions containing bovine serum albumin, and solutions containing the surfactant sodium dodecyl sulfate. In comparison to conventional hydrophobic membranes, our multiscale porous membranes exhibit superior fouling resistance while attaining a higher distillation flux without using fluorinated compounds. This study demonstrates a viable method for optimizing MD processes for wastewater and saltwater treatment.
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Affiliation(s)
- Prexa Shah
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Youmin Hou
- School
of Power and Mechanical Engineering, Wuhan
University, 430072 Wuhan, China
| | - Hans-Jürgen Butt
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Michael Kappl
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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22
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Niinomi H, Yamazaki T, Nada H, Hama T, Kouchi A, Oshikiri T, Nakagawa M, Kimura Y. Anisotropy in spinodal-like dynamics of unknown water at ice V-water interface. Sci Rep 2023; 13:16227. [PMID: 37821508 PMCID: PMC10567706 DOI: 10.1038/s41598-023-43295-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/21/2023] [Indexed: 10/13/2023] Open
Abstract
Experimentally demonstrating the existence of waters with local structures unlike that of common water is critical for understanding both the origin of the mysterious properties of water and liquid polymorphism in single component liquids. At the interfaces between water and ices Ih, III, and VI grown/melted under pressure, we previously discovered low- and high-density unknown waters, that are immiscible with the surrounding water. Here, we show, by in-situ optical microscopy, that an unknown water appears at the ice V-water interface via spinodal-like dynamics. The dewetting dynamics of the unknown water indicate that its characteristic velocity is ~ 90 m/s. The time evolution of the characteristic length of the spinodal-like undulation suggests that the dynamics may be described by a common model for spinodal decomposition of an immiscible liquid mixture. Spinodal-like dewetting dynamics of the unknown water transiently showed anisotropy, implying the property of a liquid crystal.
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Affiliation(s)
- Hiromasa Niinomi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan.
| | - Tomoya Yamazaki
- Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo, Hokkaido, 060-0819, Japan
| | - Hiroki Nada
- Graduate School of Engineering, Tottori University, 4-101 Koyama-Cho Minami, Tottori, Tottori, 680-8552, Japan
| | - Tetsuya Hama
- Komaba Institute for Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902, Japan
| | - Akira Kouchi
- Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo, Hokkaido, 060-0819, Japan
| | - Tomoya Oshikiri
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
- Research Institute for Electronic Science, Hokkaido University, Kita-21, Nishi-10, Kita-ku, Sapporo, Hokkaido, 001-0021, Japan
| | - Masaru Nakagawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
| | - Yuki Kimura
- Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo, Hokkaido, 060-0819, Japan
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23
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Li P, Huang X, Zhao YP. Electro-capillary peeling of thin films. Nat Commun 2023; 14:6150. [PMID: 37788992 PMCID: PMC10547721 DOI: 10.1038/s41467-023-41922-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 09/21/2023] [Indexed: 10/05/2023] Open
Abstract
Thin films are widely-used functional materials that have attracted much interest in academic and industrial applications. With thin films becoming micro/nanoscale, developing a simple and nondestructive peeling method for transferring and reusing the films remains a major challenge. Here, we develop an electro-capillary peeling strategy that achieves thin film detachment by driving liquid to percolate and spread into the bonding layer under electric fields, immensely reducing the deformation and strain of the film compared with traditional methods (reaching 86%). Our approach is evaluated via various applied voltages and films, showing active control characterizations and being appropriate for a broad range of films. Theoretically, electro-capillary peeling is achieved by utilizing the Maxwell stress to compete with the film's adhesion stress and tension stress. This work shows the great potential of the electro-capillary peeling method to provide a simple way to transfer films and facilitates valid avenues for reusing soft materials.
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Affiliation(s)
- Peiliu Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
| | - Xianfu Huang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
| | - Ya-Pu Zhao
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China.
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24
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Niemczak M, Stachowiak W, Kaczmarek DK, Grzanka M, Sobiech Ł. A comprehensive study demonstrating the influence of the solvent composition on the phytotoxicity of compounds, as exemplified by 2,4-D-based ILs with a choline-type cation. Pest Manag Sci 2023; 79:3602-3610. [PMID: 37183344 DOI: 10.1002/ps.7543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 05/08/2023] [Accepted: 05/15/2023] [Indexed: 05/16/2023]
Abstract
BACKGROUND Growing concern for the protection of the environment and existing ecosystems has resulted in increasing consideration of phytotoxicity tests as valid ecotoxicological indicators of the potential hazards of the use of ionic liquids (ILs) or any other chemical. The objective of this study was to gain a detailed understanding of the influence of the solvent composition of spray solutions on the phytotoxic effect of foliar application of ionic pairs with weak (choline 2,4-dichlorophenoxyacetate, [Chol][2,4-D]), medium (N-hexylcholine 2,4-dichlorophenoxyacetate, [C6 Chol][2,4-D]) and good (N-dodecylcholine 2,4-dichlorophenoxyacetate, [C12 Chol][2,4-D]) surface-active properties. RESULTS Experimental results unambiguously demonstrated that the biological activity of the test salt solutions, particularly [Chol][2,4-D] and [C6 Chol][2,4-D], can be strongly affected by the addition of an organic solvent, such as methanol, ethanol, dimethylformamide (DMF) or dimethylsulfoxide (DMSO) compared to solutions in pure water. However, the observed tendency is less pronounced for the compound exhibiting good surface activity, [C12 Chol][2,4-D]. CONCLUSIONS The collected findings show that caution is warranted in the exploitation or modification of methodologies for assessing phytotoxicity to ensure the reliable interpretation of obtained results for environmental risk assessment or building quantitative structure-activity relationship (QSAR) models. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Michał Niemczak
- Faculty of Chemical Technology, Poznan University of Technology, Poznan, Poland
| | - Witold Stachowiak
- Faculty of Chemical Technology, Poznan University of Technology, Poznan, Poland
| | | | - Monika Grzanka
- Department of Agronomy, Poznan University of Life Sciences, Poznan, Poland
| | - Łukasz Sobiech
- Department of Agronomy, Poznan University of Life Sciences, Poznan, Poland
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25
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Liu JX, Haataja MP, Košmrlj A, Datta SS, Arnold CB, Priestley RD. Liquid-liquid phase separation within fibrillar networks. Nat Commun 2023; 14:6085. [PMID: 37770446 PMCID: PMC10539382 DOI: 10.1038/s41467-023-41528-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 09/06/2023] [Indexed: 09/30/2023] Open
Abstract
Complex fibrillar networks mediate liquid-liquid phase separation of biomolecular condensates within the cell. Mechanical interactions between these condensates and the surrounding networks are increasingly implicated in the physiology of the condensates and yet, the physical principles underlying phase separation within intracellular media remain poorly understood. Here, we elucidate the dynamics and mechanics of liquid-liquid phase separation within fibrillar networks by condensing oil droplets within biopolymer gels. We find that condensates constrained within the network pore space grow in abrupt temporal bursts. The subsequent restructuring of condensates and concomitant network deformation is contingent on the fracture of network fibrils, which is determined by a competition between condensate capillarity and network strength. As a synthetic analog to intracellular phase separation, these results further our understanding of the mechanical interactions between biomolecular condensates and fibrillar networks in the cell.
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Affiliation(s)
- Jason X Liu
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA
- Princeton Materials Institute, Princeton University, Princeton, NJ, 08544, USA
| | - Mikko P Haataja
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA
- Princeton Materials Institute, Princeton University, Princeton, NJ, 08544, USA
| | - Andrej Košmrlj
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA
- Princeton Materials Institute, Princeton University, Princeton, NJ, 08544, USA
| | - Sujit S Datta
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08544, USA
| | - Craig B Arnold
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA
- Princeton Materials Institute, Princeton University, Princeton, NJ, 08544, USA
| | - Rodney D Priestley
- Princeton Materials Institute, Princeton University, Princeton, NJ, 08544, USA.
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08544, USA.
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26
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Zhou X, Zang H, Guan Y, Li S, Liu M. Superhydrophobic Flexible Strain Sensors Constructed Using Nanomaterials: Their Fabrications and Sustainable Applications. Nanomaterials (Basel) 2023; 13:2639. [PMID: 37836280 PMCID: PMC10574333 DOI: 10.3390/nano13192639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 10/15/2023]
Abstract
Superhydrophobic flexible strain sensors, which combine superhydrophobic coatings with highly sensitive flexible sensors, significantly enhance sensor performance and expand applications in human motion monitoring. Superhydrophobic coatings provide water repellency, surface self-cleaning, anti-corrosion, and anti-fouling properties for the sensors. Additionally, they enhance equipment durability. At present, many studies on superhydrophobic flexible sensors are still in the early research stage; the wear resistance and stability of sensors are far from reaching the level of industrial application. This paper discusses fundamental theories such as the wetting mechanism, tunneling effect, and percolation theory of superhydrophobic flexible sensors. Additionally, it reviews commonly used construction materials and principles of these sensors. This paper discusses the common preparation methods for superhydrophobic flexible sensors and summarizes the advantages and disadvantages of each method to identify the most suitable approach. Additionally, this paper summarizes the wide-ranging applications of the superhydrophobic flexible sensor in medical health, human motion monitoring, anti-electromagnetic interference, and de-icing/anti-icing, offering insights into these fields.
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Affiliation(s)
- Xiaodong Zhou
- School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China; (X.Z.); (H.Z.)
| | - Hongxin Zang
- School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China; (X.Z.); (H.Z.)
| | - Yong Guan
- Shandong Inov Polyurethane Co., Ltd., Zibo 255000, China
| | - Shuangjian Li
- National Engineering Laboratory of Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Mingming Liu
- School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China; (X.Z.); (H.Z.)
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27
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Qi C, Ma X, Zhong J, Fang J, Huang Y, Deng X, Kong T, Liu Z. Facile and Programmable Capillary-Induced Assembly of Prototissues via Hanging Drop Arrays. ACS Nano 2023; 17:16787-16797. [PMID: 37639562 DOI: 10.1021/acsnano.3c03516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
An important goal for bottom-up synthetic biology is to construct tissue-like structures from artificial cells. The key is the ability to control the assembly of the individual artificial cells. Unlike most methods resorting to external fields or sophisticated devices, inspired by the hanging drop method used for culturing spheroids of biological cells, we employ a capillary-driven approach to assemble giant unilamellar vesicles (GUVs)-based protocells into colonized prototissue arrays by means of a coverslip with patterned wettability. By spatially confining and controllably merging a mixed population of lipid-coated double-emulsion droplets that hang on a water/oil interface, an array of synthetic tissue-like constructs can be obtained. Each prototissue module in the array comprises multiple tightly packed droplet compartments where interfacial lipid bilayers are self-assembled at the interfaces both between two neighboring droplets and between the droplet and the external aqueous environment. The number, shape, and composition of the interconnected droplet compartments can be precisely controlled. Each prototissue module functions as a processer, in which fast signal transports of molecules via cell-cell and cell-environment communications have been demonstrated by molecular diffusions and cascade enzyme reactions, exhibiting the ability to be used as biochemical sensing and microreactor arrays. Our work provides a simple yet scalable and programmable method to form arrays of prototissues for synthetic biology, tissue engineering, and high-throughput assays.
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Affiliation(s)
- Cheng Qi
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Xudong Ma
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Junfeng Zhong
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Jiangyu Fang
- Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Yuanding Huang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Xiaokang Deng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
| | - Tiantian Kong
- Department of Biomedical Engineering, School of Medicine, Shenzhen University, Shenzhen, Guangdong 518000, China
- Department of Urology, Shenzhen Institute of Translational Medicine, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, Guangdong 518000, China
| | - Zhou Liu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518000, China
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28
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Jiang S, Li B, Zhao J, Wu D, Zhang Y, Zhao Z, Zhang Y, Yu H, Shao K, Zhang C, Li R, Chen C, Shen Z, Hu J, Dong B, Zhu L, Li J, Wang L, Chu J, Hu Y. Magnetic Janus origami robot for cross-scale droplet omni-manipulation. Nat Commun 2023; 14:5455. [PMID: 37673871 PMCID: PMC10482950 DOI: 10.1038/s41467-023-41092-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 08/22/2023] [Indexed: 09/08/2023] Open
Abstract
The versatile manipulation of cross-scale droplets is essential in many fields. Magnetic excitation is widely used for droplet manipulation due to its distinguishing merits. However, facile magnetic actuation strategies are still lacked to realize versatile multiscale droplet manipulation. Here, a type of magnetically actuated Janus origami robot is readily fabricated for versatile cross-scale droplet manipulation including three-dimensional transport, merging, splitting, dispensing and release of daughter droplets, stirring and remote heating. The robot allows untethered droplet manipulation from ~3.2 nL to ~51.14 μL. It enables splitting of droplet, precise dispensing (minimum of ~3.2 nL) and release (minimum of ~30.2 nL) of daughter droplets. The combination of magnetically controlled rotation and photothermal properties further endows the robot with the ability to stir and heat droplets remotely. Finally, the application of the robot in polymerase chain reaction (PCR) is explored. The extraction and purification of nucleic acids can be successfully achieved.
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Affiliation(s)
- Shaojun Jiang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Bo Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, China
| | - Jun Zhao
- Center of Engineering Technology Research for Biomedical Optical Instrument, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China.
| | - Yiyuan Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Zhipeng Zhao
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Yiyuan Zhang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Hao Yu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, China
| | - Kexiang Shao
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Cong Zhang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Rui Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Chao Chen
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Zuojun Shen
- Department of Clinical Laboratory, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China
| | - Jie Hu
- Department of Clinical Laboratory, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China
| | - Bin Dong
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Ling Zhu
- Center of Engineering Technology Research for Biomedical Optical Instrument, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China
| | - Jiawen Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Liqiu Wang
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
| | - Jiaru Chu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China.
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29
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Eljaddi T, Cabassud C. Wetting-Based Comparison of Ag, Carbon Black, and MoS 2 Composite Membranes for Photothermal Membrane Distillation. Membranes (Basel) 2023; 13:780. [PMID: 37755202 PMCID: PMC10535641 DOI: 10.3390/membranes13090780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/26/2023] [Accepted: 08/29/2023] [Indexed: 09/28/2023]
Abstract
Photothermal membrane distillation is a new-generation desalination process that can take advantage of the ability of specific materials to convert solar energy to heat at the membrane surface and thus to overcome temperature polarization. The development of appropriate photothermal membranes is challenging because many criteria need to be considered, including light to heat conversion, permeability and low wetting, and fouling, as well as cost. Based on our experience with wetting characterization, this study compares photothermal membranes prepared using different well-known or promising materials, i.e., silver nanoparticles (Ag NPs), carbon black, and molybdenum disulfide (MoS2), in terms of their structural properties, permeability, wettability, and wetting. Accordingly, membranes with different proportions of photothermal NPs are prepared and fully characterized in this study. Wetting is investigated using the detection of dissolved tracer intrusion (DDTI) method following membrane distillation operations with saline solutions. The advantages of MoS2 and carbon black-based photothermal membranes in comparison with polyvinylidene difluoride (PVDF) membranes include both a permeability increase and a less severe wetting mechanism, with lower wetting indicators in the short term. These materials are also much cheaper than Ag NPs, having higher permeabilities and presenting less severe wetting mechanisms.
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Affiliation(s)
| | - Corinne Cabassud
- Toulouse Biotechnology Institute, Université de Toulouse, CNRS, INRAE, INSA, 135 Avenue de Rangueil, CEDEX 04, 31077 Toulouse, France
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30
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Zhou W, Min S, Zhan T, Zhang Y, Pan D, Yuan Y, Xu B. Highly Durable Janus Fabrics Based on Transfer Prints for Personal Moisture Management. Small 2023; 19:e2302512. [PMID: 37116110 DOI: 10.1002/smll.202302512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 03/25/2023] [Indexed: 06/19/2023]
Abstract
Janus fabrics with moisture management ability have great potential for improving both physiological and psychological comfort of human body. However, current methods for creating Janus fabrics are typically complex, environmentally unfriendly, and costly. More importantly, the prepared Janus fabrics have demonstrated insufficient mechanical properties and poor fastness, rendering them unsuitable for practical applications. Here, this work proposes a method for constructing Janus fabrics through thermal transfer printing of hydrophobic transfer prints onto a superhydrophilic cotton fabric, followed by creation of a conical micropore array on the fabric surface. The as-prepared Janus fabrics exhibit excellent unidirectional liquid transport capacity, capable of transporting 50 µL water completely in 11.6 s in the positive direction. Attributed to the durable property of the transfer prints, the Janus fabrics are capable of withstanding over 900 friction cycles and 250 home laundry cycles, which is a great advance in this research field. Additionally, the fabrication process has no detrimental effect on the fabric's breathability, elasticity, and flexibility. Furthermore, the Janus fabric can maintain human body temperature 3.6 °C cooler than that worn with cotton fabric. The fabrication method can provide useful insights for the design and creation of durable Janus fabrics to maximize personal comfort.
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Affiliation(s)
- Wei Zhou
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Shuqiang Min
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Tonghuan Zhan
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
| | - Yue Zhang
- School of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, P. R. China
| | - Deng Pan
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, 111 Jiu Long Road, Hefei, 230601, P. R. China
| | - Yan Yuan
- School of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, P. R. China
| | - Bing Xu
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China
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31
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Parisi G, Szewczyk PK, Narayan S, Stachewicz U. Photoresponsive Electrospun Fiber Meshes with Switchable Wettability for Effective Fog Water Harvesting in Variable Humidity Conditions. ACS Appl Mater Interfaces 2023; 15:40001-40010. [PMID: 37556848 PMCID: PMC10450686 DOI: 10.1021/acsami.3c07044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 07/31/2023] [Indexed: 08/11/2023]
Abstract
The global water supply worsens yearly with climate change; therefore, the need for sustainable water resources is growing. One of them is fog water collectors with variable surface wettability, with multifunctional designs for utilization worldwide and to address regions with low humidity levels. Therefore, we created fiber meshes with a photoresponsive switchable surface. This study uses electrospun polyvinylidene fluoride (PVDF) meshes, whose wettability is controlled by adding TiO2. The fog water collection performance is studied at high and low humidity levels. With TiO2-PVDF, the electrospun mesh can be converted from hydrophobic to hydrophilic under UV irradiation and transformed back to a hydrophobic state with heat treatment. The switchable meshes were found to be more effective at water collection after UV irradiation at lower fog rates of 200 mL·h-1. The ability to switch between hydrophobic and hydrophilic properties as needed is highly desired in fog collection applications using electrospun meshes, as it can improve overall efficiency after UV irradiation.
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Affiliation(s)
- Gregory Parisi
- Department
of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Piotr K. Szewczyk
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Krakow, al. A. Mickiewicza 30, Krakow 30-059, Poland
| | - Shankar Narayan
- Department
of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Urszula Stachewicz
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Krakow, al. A. Mickiewicza 30, Krakow 30-059, Poland
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32
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Heo J, Lee J, Shim W, Kim H, Fujii S, Lim J, Kappl M, Butt HJ, Wooh S. Evaporation-driven Supraparticle Synthesis by Self-Lubricating Colloidal Dispersion Microdrops. ACS Appl Mater Interfaces 2023; 15:38986-38995. [PMID: 37530444 DOI: 10.1021/acsami.3c07719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
The surface-templated evaporation-driven (S-TED) method that uses liquid-repellent surfaces has attracted considerable attention for its use in fabricating supraparticles of defined shape, size, and porosity. However, challenges in achieving mass production have impeded the widespread adoption of the S-TED method. To overcome this limit, we introduce an evaporation-driven "multiple supraparticle" synthesis by drying arrays of self-lubricating colloidal dispersion microdrops. To facilitate this synthetic method, a hydrophilic micropattern is prepared on a hydrophobic substrate as a template. During the removal of the substrate out of a dispersion, liquid drops are trapped and generate a microdrop array. To produce supraparticles, the contact lines of the trapped drops must be able to recede freely during evaporation. However, hydrophilic micropatterns induce strong contact line pinning for microdrops that hinders supraparticle formation. Herein, we solve this contradiction by employing an Ouzo-like colloidal dispersion, where we can control the wettability of the drop trapping domain. The self-lubrication effect provided by the Ouzo-like solution enables smooth movement of the drops' contact lines during evaporation, thereby resulting in the successful fabrication of supraparticle arrays even within the trapping domain. This strategy offers a promising and scalable approach for large-scale evaporation-driven supraparticle synthesis with a potential for extension to various primary colloidal particles, further broadening its applicability.
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Affiliation(s)
- Jeongbin Heo
- School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Jaeseung Lee
- School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Wonmi Shim
- School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Hyeonjin Kim
- School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Jaehoon Lim
- SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Michael Kappl
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany
| | - Sanghyuk Wooh
- School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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33
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Niu P, Mao H, Lim KH, Wang Q, Wang WJ, Yang X. Nanocellulose-Based Hollow Fibers for Advanced Water and Moisture Management. ACS Nano 2023; 17:14686-14694. [PMID: 37459214 DOI: 10.1021/acsnano.3c02553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Natural plant fibers such as cotton have favorable performance in water and moisture management; however, they suffer from inferior processing ability due to limited diameter and length, as well as natural defects. Although commercially available regenerated cellulose fibers such as lyocell fibers can have tunable structures, they rely on the complete dissolution of cellulose molecules, including the highly crystalline parts, leading to inferior mechanical properties. Through a specially designed coaxial wet-spinning process, we prepare a type of hollow fiber using only cellulose nanofibrils (CNFs) as building blocks. It mimics cotton fibers with a lumen structure but with a tunable diameter and a long length. Moreover, such hollow fibers have superior mechanical properties with a Young's modulus of 24.7 GPa and tensile strength of 341 MPa, surpassing lyocell fibers and most wet-spun CNF-based fibers. Importantly, they have 10 times higher wicking ability, wetting rate, drying rate, and maximum wetting ratio compared to lyocell fibers. Together with a superior long-term performance after 500 rounds of wetting-drying tests, such CNF-based hollow fibers are sustainable choices for advanced textile applications. And this study provides a greater understanding of nanoscale building blocks and their assembled macromaterials, which may help to reveal the magic hierarchical design of natural materials, in this case, plant fibers.
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Affiliation(s)
- Panpan Niu
- State Key Laboratory of Chemical Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
- Institute of Zhejiang University, Quzhou 324000, People's Republic of China
| | - Hui Mao
- State Key Laboratory of Chemical Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Khak Ho Lim
- Institute of Zhejiang University, Quzhou 324000, People's Republic of China
| | - Qingyue Wang
- Institute of Zhejiang University, Quzhou 324000, People's Republic of China
| | - Wen-Jun Wang
- State Key Laboratory of Chemical Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
- Institute of Zhejiang University, Quzhou 324000, People's Republic of China
| | - Xuan Yang
- State Key Laboratory of Chemical Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
- Institute of Zhejiang University, Quzhou 324000, People's Republic of China
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34
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Shen J, Chen C, Zhang M. Microscopic Analysis of the Wetting Morphology and Interfacial Bonding Mechanism of Preoxidised Kovar Alloys with Borosilicate Glass. Materials (Basel) 2023; 16:4628. [PMID: 37444941 DOI: 10.3390/ma16134628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 07/15/2023]
Abstract
This paper investigates the wettability of Kovar alloys with high-borosilicate glass and microscopically analyses the mechanism of wettability and diffusion between Kovar and borosilicate glass. First, Kovar was oxidised at 800 °C for 5, 15, 25, 35, and 60 min to observe the oxide morphology of the Kovar surface layer and to analyse the composition of the oxide layer. To investigate the wetting pattern formations of Kovar and high-borosilicate glass under different wetting temperatures, times, and preoxidation conditions, Kovar and high-borosilicate glass obtained from different oxidation treatments were held at 1060 °C for 20 min for wetting experiments, and the glass-metal wetting interface morphology and elemental distribution were observed using SEM and EDS. The elemental diffusion at the wetting interface between the borosilicate glass and the Kovar with different preoxidation and at the glass spreading boundary was investigated. The longitudinal diffusion of the liquid glass in the metal oxide layer formed a new tight chemical bond of Fe2SiO4, and the lateral diffusion of the liquid glass in the Kovar surface layer formed a black halo.
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Affiliation(s)
- Jiajia Shen
- Laser Processing Research Center, School of Mechanical and Electric Engineering, Soochow University, Suzhou 215131, China
| | - Changjun Chen
- Laser Processing Research Center, School of Mechanical and Electric Engineering, Soochow University, Suzhou 215131, China
| | - Min Zhang
- Laser Processing Research Center, School of Mechanical and Electric Engineering, Soochow University, Suzhou 215131, China
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35
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Grübel J, L Albernaz V, Tsianaka A, Jauch CO, Quirin S, Kerger C, Kohl CG, Burger-Kentischer A, Tovar GEM, Southan A. Preparation of multifunctional hydrogels with accessible isothiouronium groups via radical cross-linking copolymerization. Sci Rep 2023; 13:10361. [PMID: 37365250 PMCID: PMC10293292 DOI: 10.1038/s41598-023-36956-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 06/13/2023] [Indexed: 06/28/2023] Open
Abstract
Hydrogels can be equipped with functional groups for specific purposes. Isothiouronium groups can enhance adsorptivity, or allow coupling of other functional groups through mild reactions after transformation to thiol groups. Here we present a method to prepare multifunctional hydrogels by introducing isothiouronium groups into poly(ethylene glycol) diacrylate (PEGDA) hydrogels, and convert them into thiol-functionalized hydrogels by the reduction of the isothiouronium groups. For this purpose, the amphiphilic monomer 2-(11-(acryloyloxy)-undecyl)isothiouronium bromide (AUITB), containing an isothiouronium group, was synthesized and copolymerized with PEGDA. In this convenient way, it was possible to incorporate up to 3 wt% AUITB into the hydrogels without changing their equilibrium swelling degree. The successful functionalization was demonstrated by surface analysis of the hydrogels with water contact angle measurements and increased isoelectric points of the hydrogel surfaces from 4.5 to 9.0 due to the presence of the isothiouronium groups. The hydrogels showed a suitability as an adsorbent, as exemplified by the pronounced adsorption of the anionic drug diclofenac. The potential of the functionalization for (bio)conjugation reactions was demonstrated by the reduction of isothiouronium groups to thiols and subsequent immobilization of the functional enzyme horseradish peroxidase on the hydrogels. The results show that fully accessible isothiouronium groups can be introduced into radically cross-linked hydrogels.
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Affiliation(s)
- Jana Grübel
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Vanessa L Albernaz
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Anastasia Tsianaka
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Corinna O Jauch
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Silia Quirin
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Christian Kerger
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Christina G Kohl
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Anke Burger-Kentischer
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstr. 12, 70569, Stuttgart, Germany
| | - Günter E M Tovar
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany.
- Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, Nobelstr. 12, 70569, Stuttgart, Germany.
| | - Alexander Southan
- Institute of Interfacial Process Engineering and Plasma Technology IGVP, University of Stuttgart, Nobelstr. 12, 70569, Stuttgart, Germany.
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany.
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36
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Dai Y, Li M, Ji B, Wang X, Yang S, Yu P, Wang S, Hao C, Wang Z. Liquid metal droplets bouncing higher on thicker water layer. Nat Commun 2023; 14:3532. [PMID: 37316489 PMCID: PMC10267135 DOI: 10.1038/s41467-023-39348-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 06/08/2023] [Indexed: 06/16/2023] Open
Abstract
Liquid metal (LM) has gained increasing attention for a wide range of applications, such as flexible electronics, soft robots, and chip cooling devices, owing to its low melting temperature, good flexibility, and high electrical and thermal conductivity. In ambient conditions, LM is susceptible to the coverage of a thin oxide layer, resulting in unwanted adhesion with underlying substrates that undercuts its originally high mobility. Here, we discover an unusual phenomenon characterized by the complete rebound of LM droplets from the water layer with negligible adhesion. More counterintuitively, the restitution coefficient, defined as the ratio between the droplet velocities after and before impact, increases with water layer thickness. We reveal that the complete rebound of LM droplets originates from the trapping of a thinly low-viscosity water lubrication film that prevents droplet-solid contact with low viscous dissipation, and the restitution coefficient is modulated by the negative capillary pressure in the lubrication film as a result of the spontaneous spreading of water on the LM droplet. Our findings advance the fundamental understanding of complex fluids' droplet dynamics and provide insights for fluid control.
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Affiliation(s)
- Yuhang Dai
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
- Department of Mechanical and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Minfei Li
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Bingqiang Ji
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Xiong Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Siyan Yang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China
| | - Peng Yu
- Department of Mechanical and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China.
| | - Chonglei Hao
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, 518055, China.
| | - Zuankai Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, 999077, China.
- Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, 999077, China.
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37
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Šako M, Staniscia F, Schneck E, Netz RR, Kanduč M. Conditions for the stable adsorption of lipid monolayers to solid surfaces. PNAS Nexus 2023; 2:pgad190. [PMID: 37383024 PMCID: PMC10299894 DOI: 10.1093/pnasnexus/pgad190] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 05/22/2023] [Accepted: 05/31/2023] [Indexed: 06/30/2023]
Abstract
Lipid monolayers are ubiquitous in biological systems and have multiple roles in biotechnological applications, such as lipid coatings that enhance colloidal stability or prevent surface fouling. Despite the great technological importance of surface-adsorbed lipid monolayers, the connection between their formation and the chemical characteristics of the underlying surfaces has remained poorly understood. Here, we elucidate the conditions required for stable lipid monolayers nonspecifically adsorbed on solid surfaces in aqueous solutions and water/alcohol mixtures. We use a framework that combines the general thermodynamic principles of monolayer adsorption with fully atomistic molecular dynamics simulations. We find that, very universally, the chief descriptor of adsorption free energy is the wetting contact angle of the solvent on the surface. It turns out that monolayers can form and remain thermodynamically stable only on substrates with contact angles above the adsorption contact angle, θads. Our analysis establishes that θads falls into a narrow range of around 60∘-70∘ in aqueous media and is only weakly dependent on the surface chemistry. Moreover, to a good approximation, θads is roughly determined by the ratio between the surface tensions of hydrocarbons and the solvent. Adding small amounts of alcohol to the aqueous medium lowers θads and thereby facilitates monolayer formation on hydrophilic solid surfaces. At the same time, alcohol addition weakens the adsorption strength on hydrophobic surfaces and results in a slowdown of the adsorption kinetics, which can be useful for the preparation of defect-free monolayers.
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Affiliation(s)
- Marin Šako
- Department of Theoretical Physics, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia
| | - Fabio Staniscia
- Department of Theoretical Physics, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia
| | - Emanuel Schneck
- Department of Physics, Technische Universität Darmstadt, Hochschulstrasse 8, Darmstadt 64289, Hesse, Germany
| | - Roland R Netz
- Fachbereich Physik, Freie Universität Berlin, Berlin 14195, Germany
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38
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Tran HH, Lee D, Riassetto D. Wetting ridges on slippery liquid-infused porous surfaces. Rep Prog Phys 2023; 86. [PMID: 36990071 DOI: 10.1088/1361-6633/acc87a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 03/28/2023] [Indexed: 05/23/2023]
Abstract
Slippery liquid-infused porous surfaces (SLIPS) show remarkable liquid repellency, making them useful for many coating applications. The outstanding repellency of SLIPS comes from a lubricant layer stabilized within and at the surface of a porous template. The stability of this lubricant layer is key for SLIPS to exhibit their unique functionality. The lubricant layer, however, is depleted over time, causing degradation of liquid repellency. The formation of wetting ridges surrounding liquid droplets on the surface of SLIPS is one of the primary sources of lubricant depletion. Here, we present the fundamental understanding and characteristics of wetting ridges and highlight the latest developments that enable the detailed investigation and suppression of wetting ridge formation on SLIPS. In addition, we offer our perspectives on new and exciting directions for SLIPS.
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Affiliation(s)
- Hong-Huy Tran
- University Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering University Grenoble Alpes), LMGP, Grenoble 38000, France
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, United States of America
| | - David Riassetto
- University Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering University Grenoble Alpes), LMGP, Grenoble 38000, France
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39
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Wang Y, Chang H, Rao W. Surface Oxidation and Wetting Synergistic Effect of Liquid Metals. ACS Appl Mater Interfaces 2023; 15:24003-24012. [PMID: 37150931 DOI: 10.1021/acsami.3c04202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Various functions of liquid metals are closely related to their surface performances, among which oxidation and wetting are the two most important surface processes. The two processes of liquid metals are inseparable in most practical applications; however, the coupling of oxidation and wetting of liquid metals has received little attention. Here, we demonstrate the synergistic effect of oxidation and wetting of liquid metals through establishing a liquid system containing the copper ion acid solution. By modulating the concentrations of copper ions and hydrogen ions, three different modes of the liquid metal surface are presented, where the oxidation process and the wetting process are in a competitive relationship. Whichever of the two processes is dominant can determine the stability of copper particles produced on the surface of liquid metals, that is, affect whether the "phagocytosis" process can occur. It is revealed that the magnitude of current density on the surface of liquid metals, caused by galvanic corrosion behavior between liquid metals and copper particles, is the key factor influencing the dominance of different surface processes of liquid metals. Utilizing the synergistic effect, we prepare a liquid metal film with adjustable reflectivity, in which surface states can be changed repeatedly between the bright state and the darken state by simple solution immersion. The liquid metal film with different surface states can show obvious difference in optical performance, which has application potential in color camouflage. Understanding the surface synergistic effect will facilitate further exploration of the abundant exotic liquid metal interface phenomena.
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Affiliation(s)
- Yushu Wang
- Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Hao Chang
- Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wei Rao
- Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Engineering, University of Chinese Academy of Sciences, Beijing 100864, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100864, China
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40
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Yang M, Wan X, Liu M, Wang Z, Jia L, Zhang F, Wang S. Wetting-Enabled Three-Dimensional Interfacial Polymerization (WET-DIP) for Bioinspired Anti-Dehydration Hydrogels. Small 2023; 19:e2208157. [PMID: 36808873 DOI: 10.1002/smll.202208157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/04/2023] [Indexed: 05/25/2023]
Abstract
Anti-dehydration hydrogels have attracted considerable attention due to their promising applications in stretchable sensors, flexible electronics, and soft robots. However, anti-dehydration hydrogels prepared by conventional strategies inevitably depend on additional chemicals or suffer from cumbersome preparation processes. Here, inspired by the succulent Fenestraria aurantiaca a one-step wetting-enabled three-dimensional interfacial polymerization (WET-DIP) strategy for constructing organogel-sealed anti-dehydration hydrogels is developed. By virtue of the preferential wetting on the hydrophobic-oleophilic substrate surfaces, the organogel precursor solution can spread on the three-dimensional (3D) surface and encapsulate the hydrogel precursor solution, forming anti-dehydration hydrogel with 3D shape after in situ interfacial polymerization. The WET-DIP strategy is simple and ingenious, and accessible to discretionary 3D-shaped anti-dehydration hydrogels with a controllable thickness of the organogel outer layer. Strain sensors based on this anti-dehydration hydrogel also exhibit long-term stability in signal monitoring. This WET-DIP strategy shows great potentialities for constructing hydrogel-based devices with long-term stability.
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Affiliation(s)
- Man Yang
- 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
| | - Xizi Wan
- 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
| | - Mingqian Liu
- 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
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhao 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
| | - Lanxin Jia
- 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
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Feilong Zhang
- 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
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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41
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Gao P, MacKay I, Gruber A, Krantz J, Piccolo L, Lucchetta G, Pelaccia R, Orazi L, Masato D. Wetting Characteristics of Laser-Ablated Hierarchical Textures Replicated by Micro Injection Molding. Micromachines (Basel) 2023; 14:863. [PMID: 37421096 DOI: 10.3390/mi14040863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/06/2023] [Accepted: 04/15/2023] [Indexed: 07/09/2023]
Abstract
Texturing can be used to functionalize the surface of plastic parts and, in particular, to modify the interaction with fluids. Wetting functionalization can be used for microfluidics, medical devices, scaffolds, and more. In this research, hierarchical textures were generated on steel mold inserts using femtosecond laser ablation to transfer on plastic parts surface via injection molding. Different textures were designed to study the effects of various hierarchical geometries on the wetting behavior. The textures are designed to create wetting functionalization while avoiding high aspect ratio features, which are complex to replicate and difficult to manufacture at scale. Nano-scale ripples were generated over the micro-scale texture by creating laser-induced periodic surface structures. The textured molds were then replicated by micro-injection molding using polypropylene and poly(methyl methacrylate). The static wetting behavior was investigated on steel inserts and molded parts and compared to the theoretical values obtained from the Cassie-Baxter and Wenzel models. The experimental results showed correlations between texture design, injection molding replication, and wetting properties. The wetting behavior on the polypropylene parts followed the Cassie-Baxter model, while for PMMA, a composite wetting state of Cassie-Baxter and Wenzel was observed.
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Affiliation(s)
- Peng Gao
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Ian MacKay
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Andrea Gruber
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Joshua Krantz
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Leonardo Piccolo
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
- Department of Industrial Engineering, University of Padova, 35100 Padova, Italy
| | - Giovanni Lucchetta
- Department of Industrial Engineering, University of Padova, 35100 Padova, Italy
| | - Riccardo Pelaccia
- Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 41124 Reggio Emilia, Italy
| | - Leonardo Orazi
- Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 41124 Reggio Emilia, Italy
- EN&TECH, University of Modena and Reggio Emilia, 41124 Reggio Emilia, Italy
| | - Davide Masato
- Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
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42
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Khatir B, Golovin K. Comment on "Vapor Lubrication for Reducing Water and Ice Adhesion on Poly(dimethylsiloxane) Brushes": Vapor Alteration Alone Reduces Water Droplet Adhesion. Advanced Materials 2023; 35:e2208783. [PMID: 36960482 DOI: 10.1002/adma.202208783] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/26/2022] [Indexed: 05/17/2023]
Abstract
A reduction in lateral adhesion of water droplets on poly(dimethylsiloxane) (PDMS) brush surfaces exposed to various vapor conditions was recently reported. It was suggested that the mobility of droplets is due to swelling of the PDMS brushes. When changing the vapor surrounding sliding droplets on bare surfaces, a similar phenomenon is observed, presenting a much simpler explanation of the observed results.
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Affiliation(s)
- Behrooz Khatir
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada
| | - Kevin Golovin
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada
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43
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Guo Y, Song W, Guo L, Li X, He W, Yan X, Dingwell DB, Guo H. Molten-Volcanic-Ash-Phobic Thermal Barrier Coating based on Biomimetic Structure. Adv Sci (Weinh) 2023; 10:e2205156. [PMID: 36727826 PMCID: PMC10074056 DOI: 10.1002/advs.202205156] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 01/11/2023] [Indexed: 05/30/2023]
Abstract
Volcanic ash is a major threat to aviation safety. The softening/melting temperatures of volcanic ash lie far below typical aero-engine operating temperatures. Thus, molten ash can accelerate the failure of thermal barrier coatings (TBCs). Here, inspired by natural superhydrophobic surfaces (e.g., the lotus leaf), a molten-volcanic-ash-phobic TBC, which provides a large possibility to eliminate molten ash issues of TBCs, is developed. A hierarchically structured surface is first prepared on a (Gd0.9 Yb0.1 )2 Zr2 O7 (GYbZ) pellet by ultrafast laser direct writing technology, aiming to confirm the feasibility of the biomimetic microstructure to repel molten volcanic ash wetting. Then biomimetic-structured GYbZ TBCs are successfully fabricated using plasma spray physical vapor deposition, which reveals "silicate" phobicity at high temperatures. The exciting molten-volcanic-ash-phobic attribute of the designed surfaces is attributed to the lotus-leaf-like dual-scale microstructure, emulating in particular the existence of nanoparticles. These findings may be an important step toward the development of next-generation aviation engines with greatly reduced vulnerability to environmental siliceous debris.
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Affiliation(s)
- Yiqian Guo
- School of Materials Science and EngineeringBeihang UniversityXueyuan Road 37Beijing100191China
| | - Wenjia Song
- School of Materials Science and EngineeringBeihang UniversityXueyuan Road 37Beijing100191China
- Tianmushan LaboratoryXixi Octagon City, Yuhang DistrictHangzhou310023China
| | - Lei Guo
- School of Materials Science and EngineeringTianjin UniversityWeijin Road 92Tianjin300072China
| | - Xinxin Li
- School of Mechanical Engineering and AutomationBeihang UniversityXueyuan Road 37Beijing100191China
| | - Wenting He
- School of Materials Science and EngineeringBeihang UniversityXueyuan Road 37Beijing100191China
| | - Xudong Yan
- School of Materials Science and EngineeringBeihang UniversityXueyuan Road 37Beijing100191China
| | - Donald B. Dingwell
- Department of Earth and Environmental SciencesLudwig‐Maximilians‐Universität MünchenTheresienstrasse 4180333MunichGermany
| | - Hongbo Guo
- School of Materials Science and EngineeringBeihang UniversityXueyuan Road 37Beijing100191China
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44
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Lazauskas A, Andrulevičius M, Abakevičienė B, Jucius D, Grigaliūnas V, Guobienė A, Meškinis Š. Hydrophilic Surface Modification of Amorphous Hydrogenated Carbon Nanocomposite Films via Atmospheric Oxygen Plasma Treatment. Nanomaterials (Basel) 2023; 13:1108. [PMID: 36986002 PMCID: PMC10051189 DOI: 10.3390/nano13061108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/13/2023] [Accepted: 03/18/2023] [Indexed: 06/18/2023]
Abstract
Herein we investigated hydrophilic surface modification of SiOx containing amorphous hydrogenated carbon nanocomposite films (DLC:SiOx) via the use of atmospheric oxygen plasma treatment. The modified films exhibited effective hydrophilic properties with complete surface wetting. More detailed water droplet contact angle (CA) measurements revealed that oxygen plasma treated DLC:SiOx films maintained good wetting properties with CA of up to 28 ± 1° after 20 days of aging in ambient air at room temperature. This treatment process also increased surface root mean square roughness from 0.27 nm to 1.26 nm. Analysis of the surface chemical states suggested that the hydrophilic behavior of DLC:SiOx treated with oxygen plasma is attributed to surface enrichment with C-O-C, SiO2, and Si-Si chemical bonds as well as significant removal of hydrophobic Si-CHx functional groups. The latter functional groups are prone to restoration and are mainly responsible for the increase in CA with aging. Possible applications of the modified DLC:SiOx nanocomposite films could include biocompatible coatings for biomedical applications, antifogging coatings for optical components, and protective coatings to prevent against corrosion and wear.
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45
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Gibalova A, Arndt NB, Burg L, Ravoo BJ. Light-Responsive Conductive Surface Coatings on the Basis of Azidomethyl-PEDOT Electropolymer Films. ACS Appl Mater Interfaces 2023; 15:12363-12371. [PMID: 36848114 DOI: 10.1021/acsami.2c21995] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The design of responsive coatings has gained increasing attention recently, with light-responsive interfaces receiving particular appreciation, as their surface properties can be modulated with excellent spatiotemporal control. In this article, we present light-responsive conductive coatings acquired through a copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction between electropolymerized azide-functionalized poly(3,4-ethylenedioxythiophene) (PEDOT-N3) and arylazopyrazole (AAP)-bearing alkynes. The UV/vis and X-ray photoelectron spectroscopy (XPS) data indicate a successful post-modification, supporting a covalent attachment of AAP moieties to PEDOT-N3. The thickness and degree of PEDOT-N3 modification are accessible by varying the amount of passed charge during electropolymerization and time of reaction, respectively, providing a degree of synthetic control over the physicochemical material properties. The produced substrates demonstrate a reversible and stable light-driven switching of photochromic properties in both "dry" and swelled states, as well as efficient electrocatalytic Z → E switching. The AAP-modified polymer substrates exhibit a light-controlled wetting behavior, demonstrating a consistently reversible switching of the static water contact angle with a difference up to 10.0° for CF3-AAP@PEDOT-N3. The results highlight the application of conducting PEDOT-N3 for the covalent immobilization of molecular switches while preserving their stimuli-responsive features.
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Affiliation(s)
- Anna Gibalova
- Organic Chemistry Institute and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Corrensstr. 36, D-48149 Münster, Germany
| | - Niklas B Arndt
- Organic Chemistry Institute and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Corrensstr. 36, D-48149 Münster, Germany
| | - Luca Burg
- Organic Chemistry Institute and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Corrensstr. 36, D-48149 Münster, Germany
| | - Bart Jan Ravoo
- Organic Chemistry Institute and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Corrensstr. 36, D-48149 Münster, Germany
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46
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Luo S, Liu Y, Luo H, Jing G. Glycerol Droplet Spreading on Growing Bacillus Subtilis Biofilms. Micromachines (Basel) 2023; 14:599. [PMID: 36985005 PMCID: PMC10055872 DOI: 10.3390/mi14030599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/24/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Bacterial biofilm is a three-dimensional matrix composed of a large number of living bacterial individuals. The strong bio-interaction between the bacteria and its self-secreted matrix environment strengthens the mechanical integrity of the biofilm and the sustainable resistance of bacteria to antibiotics. As a soft surface, the biofilm is expected to present different dynamical wetting behavior in response to shear stress, which is, however, less known. Here, the spreading of liquid droplet on Bacillus subtilis biofilm at its different growing phases was experimentally investigated. Due to the viscoelastic response of the biofilm to fast spreading of the droplet, three stages were identified as inertial, viscous stages, and a longer transition in between. The physical heterogeneity of growing biofilm correlates with the spreading scaling within the inertial stage, followed by the possible chemical variation after a critical growing time. By using the duration of inertial spreading, the characteristic time scale was successfully linked to the shear modulus of the elastic dissipation of the biofilm. This measurement suggests a facile, non-destructive and in vivo method to understand the mechanical instability of this living matter.
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Affiliation(s)
| | | | - Hao Luo
- Correspondence: (Y.L.); (H.L.)
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Fodor F, Bak M. Studying the Wettability and Bonding Properties of Acetylated Hornbeam Wood Using PVAc and PUR Adhesives. Materials (Basel) 2023; 16:2046. [PMID: 36903161 PMCID: PMC10004202 DOI: 10.3390/ma16052046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 02/21/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
The present study aimed to determine how acetylation affected the bonding properties of European hornbeam wood. The research was supplemented with the investigation of wetting properties, wood shear strength, and microscopical studies of bonded wood, as these all have strong relationships with wood bonding. Acetylation was carried out on an industrial scale. Acetylated hornbeam showed a higher contact angle and lower surface energy than untreated hornbeam. Although the adhesion of the acetylated wood surface is lower due to its lower polarity and porosity, the bonding strength of acetylated hornbeam was similar to that of untreated hornbeam when bonded with PVAc D3 adhesive, and it was higher in the case of PVAc D4 and PUR adhesives. Microscopical studies proved these findings. After acetylation, hornbeam could be used in applications where it is exposed to moisture, as its bonding strength after soaking or boiling in water was significantly higher than that of untreated hornbeam.
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48
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Abstract
A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.
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Affiliation(s)
- Fei Wang
- Institute for Applied Materials - Microstructure Modelling and Simulation (IAM-MMS), Karlsruhe Institute of Technology (KIT), Strasse am Forum 7, 76131, Karlsruhe, Germany
| | - Yanchen Wu
- Institute for Applied Materials - Microstructure Modelling and Simulation (IAM-MMS), Karlsruhe Institute of Technology (KIT), Strasse am Forum 7, 76131, Karlsruhe, Germany
| | - Britta Nestler
- Institute for Applied Materials - Microstructure Modelling and Simulation (IAM-MMS), Karlsruhe Institute of Technology (KIT), Strasse am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestrasse 30, 76133, Karlsruhe, Germany
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Chevalier X, Pound-Lana G, Gomes Correia C, Cavalaglio S, Cabannes-Boué B, Restagno F, Miquelard-Garnier G, Roland S, Navarro C, Fleury G, Zelsmann M. Self-organization and de wetting kinetics in sub-10 nm diblock copolymer line/space lithography. Nanotechnology 2023; 34:175602. [PMID: 36657158 DOI: 10.1088/1361-6528/acb49f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 01/19/2023] [Indexed: 06/17/2023]
Abstract
In this work, we investigated the self-assembly of a lamellar block copolymer (BCP) under different wetting conditions. We explored the influence of the chemical composition of under-layers and top-coats on the thin film stability, self-assembly kinetics and BCP domain orientation. Three different chemistries were chosen for these surface affinity modifiers and their composition was tuned in order to provide either neutral wetting (i.e. an out-of-plane lamellar structure), or affine wetting conditions (i.e. an in-plane lamellar structure) with respect to a sub-10 nm PS-b-PDMSB lamellar system. Using such controlled wetting configurations, the competition between the dewetting of the BCP layer and the self-organization kinetics was explored. We also evaluated the spreading parameter of the BCP films with respect to the configurations of surface-energy modifiers and demonstrated that BCP layers are intrinsically unstable to dewetting in a neutral configuration. Finally, the dewetting mechanisms were evaluated with respect to the different wetting configurations and we clearly observed that the rigidity of the top-coat is a key factor to delay BCP film instability.
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Affiliation(s)
- Xavier Chevalier
- ARKEMA France, GRL, Route Nationale 117, BP34, F-64170 Lacq, France
| | - Gwenaelle Pound-Lana
- Univ. Grenoble Alpes, CNRS, CEA/LETI Minatec, Grenoble INP, LTM, F-38000 Grenoble, France
| | | | - Sébastien Cavalaglio
- Univ. Grenoble Alpes, CNRS, CEA/LETI Minatec, Grenoble INP, LTM, F-38000 Grenoble, France
| | | | - Frédéric Restagno
- Laboratoire de Physique des Solides, UMR 8502, Univ. Paris Saclay, F-91405 Orsay, France
| | - Guillaume Miquelard-Garnier
- Laboratoire PIMM, Arts et Metiers Institute of Technology, CNRS, CNAM, HESAM Universite, F-75013 Paris, France
| | - Sébastien Roland
- Laboratoire PIMM, Arts et Metiers Institute of Technology, CNRS, CNAM, HESAM Universite, F-75013 Paris, France
| | | | - Guillaume Fleury
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Marc Zelsmann
- Univ. Grenoble Alpes, CNRS, CEA/LETI Minatec, Grenoble INP, LTM, F-38000 Grenoble, France
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50
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Krichels AH, Greene AC, Jenerette GD, Spasojevic MJ, Glassman SI, Homyak PM. Precipitation legacies amplify ecosystem nitrogen losses from nitric oxide emissions in a Pinyon-Juniper dryland. Ecology 2023; 104:e3930. [PMID: 36451599 DOI: 10.1002/ecy.3930] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 10/20/2022] [Indexed: 12/04/2022]
Abstract
Climate change is increasing the variability of precipitation, altering the frequency of soil drying-wetting events and the distribution of seasonal precipitation. These changes in precipitation can alter nitrogen (N) cycling and stimulate nitric oxide (NO) emissions (an air pollutant at high concentrations), which may vary according to legacies of past precipitation and represent a pathway for ecosystem N loss. To identify whether precipitation legacies affect NO emissions, we excluded or added precipitation during the winter growing season in a Pinyon-Juniper dryland and measured in situ NO emissions following experimental wetting. We found that the legacy of both excluding and adding winter precipitation increased NO emissions early in the following summer; cumulative NO emissions from the winter precipitation exclusion plots (2750 ± 972 μg N-NO m-2 ) and winter water addition plots (2449 ± 408 μg N-NO m-2 ) were higher than control plots (1506 ± 397 μg N-NO m-2 ). The increase in NO emissions with previous precipitation exclusion was associated with inorganic N accumulation, while the increase in NO emissions with previous water addition was associated with an upward trend in microbial biomass. Precipitation legacies can accelerate soil NO emissions and may amplify ecosystem N loss in response to more variable precipitation.
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Affiliation(s)
- Alexander H Krichels
- Environmental Sciences, University of California, Riverside, California, USA.,Center for Conservation Biology, University of California, Riverside, California, USA
| | - Aral C Greene
- Environmental Sciences, University of California, Riverside, California, USA
| | - G Darrel Jenerette
- Center for Conservation Biology, University of California, Riverside, California, USA.,Botany and Plant Sciences, University of California, Riverside, California, USA
| | - Marko J Spasojevic
- Evolution, Ecology, and Organismal Biology, University of California, Riverside, California, USA
| | - Sydney I Glassman
- Microbiology and Plant Pathology, University of California, Riverside, California, USA
| | - Peter M Homyak
- Environmental Sciences, University of California, Riverside, California, USA.,Center for Conservation Biology, University of California, Riverside, California, USA
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