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Zhang J, Yong J, Yang Q, Chen F, Hou X. Femtosecond Laser-Induced Underwater Superoleophobic Surfaces with Reversible pH-Responsive Wettability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3295-3301. [PMID: 30742769 DOI: 10.1021/acs.langmuir.8b04069] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Wettability-switchable surfaces have become a research hotspot because they can exhibit different superwetting states. In this paper, the copper surfaces with pH-responsive underwater-oil wettability were prepared by femtosecond laser treatment and subsequent chemical modification. The resultant surfaces showed underwater superoleophobicity in alkaline solutions but quasi-superoleophilicity in acidic solutions. The contact angles of an underwater-oil droplet on the resultant surfaces could be reversibly tuned between 157° and 12° by changing the pH of aqueous solutions. Such switchable wettability is ascribed to the modification of the alkyl and carboxylic acids groups on the laser-structured surfaces. The as-prepared surfaces have both oil-resistance and oil-collection abilities by selectively showing underwater superoleophobicity and superoleophilicity. The smart surfaces with pH-responsive oil wettability will have important applications in controlling the oil behavior in water.
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Affiliation(s)
- Jingzhou Zhang
- State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronics & Information Engineering , Xi'an Jiaotong University , Xi'an , 710049 , PR China
- The International Joint Research Laboratory for Micro/Nano Manufacturing and Measurement Technologies , Xi'an Jiaotong University , Xi'an , 710049 , PR China
| | - Jiale Yong
- State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronics & Information Engineering , Xi'an Jiaotong University , Xi'an , 710049 , PR China
- The International Joint Research Laboratory for Micro/Nano Manufacturing and Measurement Technologies , Xi'an Jiaotong University , Xi'an , 710049 , PR China
| | - Qing Yang
- School of Mechanical Engineering , Xi'an Jiaotong University , Xi'an , 710049 , PR China
- The International Joint Research Laboratory for Micro/Nano Manufacturing and Measurement Technologies , Xi'an Jiaotong University , Xi'an , 710049 , PR China
| | - Feng Chen
- State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronics & Information Engineering , Xi'an Jiaotong University , Xi'an , 710049 , PR China
- The International Joint Research Laboratory for Micro/Nano Manufacturing and Measurement Technologies , Xi'an Jiaotong University , Xi'an , 710049 , PR China
| | - Xun Hou
- State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronics & Information Engineering , Xi'an Jiaotong University , Xi'an , 710049 , PR China
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102
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Lu J, Ngo CV, Singh SC, Yang J, Xin W, Yu Z, Guo C. Bioinspired Hierarchical Surfaces Fabricated by Femtosecond Laser and Hydrothermal Method for Water Harvesting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3562-3567. [PMID: 30759979 DOI: 10.1021/acs.langmuir.8b04295] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The world is facing a global issue of water scarcity where two-thirds of the population does not have access to safe drinking water. Water harvesting from the ambient environment has a potential equivalent to ∼10% of the fresh water available on the earth's surface, but its efficiency requires a special control of surface morphology. We report a novel facile physicochemical hybrid method that combines femtosecond laser structuring with hydrothermal treatment to create a surface with a well-arranged hierarchical nanoneedle structures. Polydimethylsiloxane treatment of the thus-produced hierarchical structures nurtured superhydrophobic functionality with a very low water sliding angle (∼3°) and a high water adhesion ability. About 2.2 times higher water-collection efficiency was achieved using hierarchical structures over untreated flat Ti surfaces of the same area under a given experimental condition. The comparison of water-collection behavior with other samples showed that the improved efficiency is due to the structure, and wettability induced superior water attraction and removal ability. Moreover, a uniform water condensation under low humidity (28%) is achieved, which has potential applications in harvesting water from arid environments and in high-precision drop control.
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Affiliation(s)
- Jinlong Lu
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
| | - Chi-Vinh Ngo
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
| | - Subhash C Singh
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
- The Institute of Optics , University of Rochester , Rochester , New York 14627 , United States
| | - Jianjun Yang
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
| | - Wei Xin
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
| | - Zhi Yu
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
| | - Chunlei Guo
- The Guo China-U.S. Photonics Lab , Changchun Institute of Optics, Fine Mechanics, and Physics , Changchun 130033 , China
- The Institute of Optics , University of Rochester , Rochester , New York 14627 , United States
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103
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Li F, Zheng K, Zheng X, Zheng L, Duan C, Xi H. Facile Synthesis of Hierarchical Micro-mesoporous HKUST-1 Using Organic Silane Surfactant as a Novel Template. ChemistrySelect 2019. [DOI: 10.1002/slct.201803971] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Feier Li
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
| | - Ke Zheng
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
| | - Xiang Zheng
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
| | - Liming Zheng
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
| | - Chongxiong Duan
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
- School of nuclear science technology; University of South China, Hunan; 421001, PR P. R. China
| | - Hongxia Xi
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 P. R. China
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control; Guangzhou Higher Education Mega Centre; Guangzhou 510006 P. R. China
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104
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Yang C, Zhu Y, Wang Y, Fu H, Deng X, Yue H, Lu H, Jiang W, Liang B. Preparation of edible superhydrophobic Fe foil with excellent stability and durability and its applications in food containers with little residue. NEW J CHEM 2019. [DOI: 10.1039/c8nj05967e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A facile three-step strategy to prepare edible superhydrophobic Fe foil with excellent stability and regeneration.
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Affiliation(s)
- Chao Yang
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Yingming Zhu
- Institute of New Energy and Low-carbon Technology
- Sichuan University
- Chengdu 610065
- China
| | - Yaoguang Wang
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Hongyan Fu
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Xiaoqiang Deng
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Hairong Yue
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Houfang Lu
- Institute of New Energy and Low-carbon Technology
- Sichuan University
- Chengdu 610065
- China
| | - Wei Jiang
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
| | - Bin Liang
- Low-carbon Technology and Reaction Engineering Laboratory
- School of Chemical Engineering
- Sichuan University
- Chengdu
- China
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105
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Li X, Dai Y, Row KH. Preparation of two-dimensional magnetic molecularly imprinted polymers based on boron nitride and a deep eutectic solvent for the selective recognition of flavonoids. Analyst 2019; 144:1777-1788. [DOI: 10.1039/c8an02258e] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Two-dimensional (2D) boron nitride (BN) were developed as a 2D scaffold material in preparation of magnetic molecularly imprinted polymers (MMIPs).
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Affiliation(s)
- Xiaoxia Li
- Department of Chemistry and Chemical Engineering
- Inha University
- Incheon 402-751
- Korea
| | - Yunliang Dai
- Department of Chemistry and Chemical Engineering
- Inha University
- Incheon 402-751
- Korea
| | - Kyung Ho Row
- Department of Chemistry and Chemical Engineering
- Inha University
- Incheon 402-751
- Korea
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106
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Lin J, Tan X, Shi T, Tang Z, Liao G. Leaf Vein-Inspired Hierarchical Wedge-Shaped Tracks on Flexible Substrate for Enhanced Directional Water Collection. ACS APPLIED MATERIALS & INTERFACES 2018; 10:44815-44824. [PMID: 30461260 DOI: 10.1021/acsami.8b13012] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Water collection has been extensively researched due to its potential for mitigating the water scarcity in arid and semiarid regions. Numerous structures mimicking the fog-harvesting strategy of organisms have been fabricated for improving water-collecting efficiency. In this contribution, we demonstrate four-level wedge-shaped tracks inspired by leaf vein for enhancing directional water collection. Superhydrophilic Cu(OH)2 nanowires are introduced and prepared on flexible hydrophobic polyethylene terephthalate (PET) substrates by alkali-assisted surface oxidation at room temperature. They provide abundant capillary paths for promoting droplet absorption and forming water film tracks. Then, the hierarchical wedge-shaped tracks enable the water to be transported to a certain accumulation region spontaneously owing to the continuous Young-Laplace pressure difference. As a result, the four-level wedge-shaped tracks on PET substrate achieve the highest water-collecting efficiency, increasing by nearly 1150 and 510% compared to the bare PET and Cu(OH)2 nanowires on PET, respectively. After being bent for 105 cycles at a radius of 10 mm, the samples can still preserve high efficiency, indicating that the synthetic structures possess outstanding durability. Our approach provides a novel strategy for water collection and paves ways for directional liquid transportation and microfluidic devices.
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Affiliation(s)
- Jianbin Lin
- State Key Lab of Digital Manufacturing Equipment and Technology , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China
| | - Xianhua Tan
- State Key Lab of Digital Manufacturing Equipment and Technology , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China
| | - Tielin Shi
- State Key Lab of Digital Manufacturing Equipment and Technology , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China
| | - Zirong Tang
- State Key Lab of Digital Manufacturing Equipment and Technology , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China
| | - Guanglan Liao
- State Key Lab of Digital Manufacturing Equipment and Technology , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China
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107
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Zhang F, Duan J, Zhou X, Wang C. Broadband and wide-angle antireflective subwavelength microstructures on zinc sulfide fabricated by femtosecond laser parallel multi-beam. OPTICS EXPRESS 2018; 26:34016-34030. [PMID: 30650832 DOI: 10.1364/oe.26.034016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 11/19/2018] [Indexed: 06/09/2023]
Abstract
The subwavelength microstructures (SWMS) on the surface of ZnS for antireflection in an infrared band have been theoretically designed and experimentally fabricated. The finite difference time domain (FDTD) simulation has been utilized to optimize geometry for obtaining high transmittance of SWMS. Then, during simulation for light field intensity distribution, the inner of SWMS emerges location and wavelength dependent light resonant region, which can be explained by Wood-Rayleigh (WR) law. Furthermore, according to refractive index gradient formation and light field coupling effect, the grating period and height are capable of regulating the band selection of antireflection and value of the transmittance, respectively. In addition, a rapid facile approach based on femtosecond laser parallel multi-beam has been proposed to experimentally realize the designed and optimal structures. The depth, period, and embedded nano-gratings of fabricated SWMS are tunable by controlling laser-processing parameters for antireflection in the wavelength of 8 μm-12 μm. Finally, the broadband and wide-angle antireflective SWMS on ZnS as well as robust mechanical strength and hydrophobicity have been achieved, expecting to be of great potential in an optoelectronic device application.
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108
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Chen D, Li J, Zhao J, Guo J, Zhang S, Sherazi TA, Ambreen, Li S. Bioinspired superhydrophilic-hydrophobic integrated surface with conical pattern-shape for self-driven fog collection. J Colloid Interface Sci 2018; 530:274-281. [DOI: 10.1016/j.jcis.2018.06.081] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 06/26/2018] [Accepted: 06/26/2018] [Indexed: 10/28/2022]
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109
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Baek S, Moon HS, Kim W, Jeon S, Yong K. Effect of liquid droplet surface tension on impact dynamics over hierarchical nanostructure surfaces. NANOSCALE 2018; 10:17842-17851. [PMID: 30221273 DOI: 10.1039/c8nr04539a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Analyzing impact dynamics is important for practical applications of superhydrophobic surfaces, because these nonwetting surfaces frequently encounter impacting liquid droplets in real environments. Thus, various studies have been conducted to investigate impact dynamics by examining the correlation between the behaviors of impacting liquid droplets and several determining parameters, such as impacting velocity, surface structure and surface energy. The impacting behaviors of pure water droplets were the main focus in most previous studies; the effect of surface tension, another critical parameter, on impact dynamics has rarely been investigated. In the current work, we have newly studied the effects of liquid surface tension on impact dynamics using an ethanol-water solution as a model liquid system. We systematically varied the liquid's surface tension between 72 and 32 mN m-1 by changing the ethanol concentration from 0 to 20 wt%. This range of composition drastically changed the surface tension while it did not significantly affect other physical properties, such as density and viscosity. For an impact dynamics study, two surfaces, namely ZnO nanowires (NWs) and ZnO/Si hierarchical (HIE) structures, were prepared. As the surface tension decreased, the static water contact angle (CA) decreased on both surfaces. Under dynamic conditions, our analysis using a high-speed camera and a quartz crystal microbalance (QCM) showed that lowering the surface tension causes the transition from the anti-wetting to wetting state. The transition We numbers were obtained on both surfaces for various surface tensions of liquids. Under the same dropping conditions of liquids, the ZnO/Si HIE surface shows higher transition We numbers than the ZnO NW surface, which is due to the higher fraction of air pockets in the hierarchical structure, originating from dual dimensional structures. To understand the mechanism of dynamic transition, we developed a model for ZnO/Si HIE structures based on three determining pressures: anti-wetting, wetting, and effective water hammer pressures. The modeling results explain the experimental observations. The results of our model system are highly useful for understanding the impact dynamic behaviors of various liquids on non-wetting surfaces.
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Affiliation(s)
- Seunghyeon Baek
- Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
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110
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Yin K, Yang S, Dong X, Chu D, Duan JA, He J. Ultrafast Achievement of a Superhydrophilic/Hydrophobic Janus Foam by Femtosecond Laser Ablation for Directional Water Transport and Efficient Fog Harvesting. ACS APPLIED MATERIALS & INTERFACES 2018; 10:31433-31440. [PMID: 30183242 DOI: 10.1021/acsami.8b11894] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Water scarcity is a serious global challenge, especially in arid and desert regions. Functional devices for directional water transport and fog collection have received increasing attention. Existing methods and technologies suffer from low fog-collecting efficiencies, complicated fabrication processes, and high fabrication costs. Herein, we report a simple and low-cost method to rapidly fabricate nanoparticle-covered microstructures on one side of a copper foam surface, using one-step femtosecond laser direct writing technology, which enormously improved processing efficiency. The resulting foam exhibits superhydrophilic/hydrophobic Janus properties. The foam allows water droplets to pass from the hydrophobic side to the superhydrophilic side, but not in the opposite direction. The Janus foam can therefore be used for harvesting water in fog environments, and the maximum water-collecting efficiency is 3.7 g cm-2 h-1, which is much better than existing data. The Janus foam exhibits excellent stability during abrasion and hydraulic wash tests. This water-collecting design may provide an efficient route for overcoming future water shortages.
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Affiliation(s)
| | | | | | - Dongkai Chu
- The Institute of Optics , University of Rochester , Rochester , New York 14627 , United States
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111
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Song YY, Liu Y, Jiang HB, Li SY, Kaya C, Stegmaier T, Han ZW, Ren LQ. A bioinspired structured graphene surface with tunable wetting and high wearable properties for efficient fog collection. NANOSCALE 2018; 10:16127-16137. [PMID: 30117515 DOI: 10.1039/c8nr04109a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Inspired by the fog harvesting ability of the spider net and the interphase wetting surface of Namib desert beetles, we designed a kind of special bioinspired hybrid wetting surface on a Cu mesh by combining polydimethylsiloxane (PDMS) and graphene (G). A surface containing hydrophobic and superhydrophobic areas is prepared by a combination of laser etching and ultrasonic vibration. Thus, this as-prepared hybrid wetting surface can quickly drive tiny water droplets toward more wettable regions, which makes a great contribution to the improvement of collection efficiency. Moreover, the PDMS/G surface not only is tolerant to many stresses such as excellent anti-corrosion ability, anti-UV exposure and oil contamination, but also shows self-healing simply by burning the worn areas, which thus endows the surface with tunable-wettability change between flame treatment and abrasive wear. This study offers a novel insight into the design of burned healed materials with interphase wettability that may enhance the fog collection efficiency in engineering liquid harvesting equipment and realizes renewable materials in situ cheaply and rapidly by processes that can be easily scaled and automated.
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Affiliation(s)
- Yun-Yun Song
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, P.R. China.
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112
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Zhu H, Duan R, Wang X, Yang J, Wang J, Huang Y, Xia F. Prewetting dichloromethane induced aqueous solution adhered on Cassie superhydrophobic substrates to fabricate efficient fog-harvesting materials inspired by Namib Desert beetles and mussels. NANOSCALE 2018; 10:13045-13054. [PMID: 29952391 DOI: 10.1039/c8nr03277g] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Namib Desert beetles harvest water from harsh environments by using their hydrophilic-hydrophobic dorsal surfaces. Generally, Cassie-state superhydrophobic materials are chosen as substrates to prepare bioinspired (super)hydrophilic/(super)hydrophobic patterned surfaces. However, due to the low adhesion and strong repellency, aqueous solution cannot be directly set on Cassie superhydrophobic materials until the dropping volume is larger than 6.5 μL. Therefore, arranging a (super)hydrophilic substance on Cassie superhydrophobic substrates to construct (super)hydrophilic/superhydrophobic patterned surfaces still remains a challenge. In this work, by prewetting with dichloromethane (DCM), the mussel-inspired hydrophilic and bio-adhesive dopamine solution (DA) could be dripped onto a Cassie superhydrophobic Cu surface with an ultralow volume of 0.1 μL, whereby low surface tension DCM would "cloak" the high surface tension DA. Along with DCM volatility, DA was adhered on the Cassie superhydrophobic surface and would then self-polymerize into hydrophilic polydopamine domains, thus hydrophilic/superhydrophobic patterned surfaces with efficient water collection could be successfully developed inspired by Namib Desert beetles and mussels. The bioinspired materials show the potential for real-world industrialization in a large scale, which is of great significance for providing living security for those living in areas with no access to fresh water.
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Affiliation(s)
- Hai Zhu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, P. R. China.
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113
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Ou JF, Fang XZ, Zhao WJ, Lei S, Xue MS, Wang FJ, Li CQ, Lu YL, Li W. Influence of Hydrostatic Pressure on the Corrosion Behavior of Superhydrophobic Surfaces on Bare and Oxidized Aluminum Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5807-5812. [PMID: 29694782 DOI: 10.1021/acs.langmuir.8b01100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
It is generally recognized that superhydrophobic surfaces in water may be used for corrosion resistance due to the entrapped air in the solid/liquid interface and could find potential applications in the protection of ship hull. For a superhydrophobic surface, as its immersion depth into water increases, the resultant hydrostatic pressure is also increased, and the entrapped air can be squeezed out much more easily. It is therefore predicted that high hydrostatic pressure would cause an unexpected decrease in corrosion resistance for the vessels in deep water (e.g., submarines) because of the unstable entrapped air. In this work, in order to clarify the role of hydrostatic pressure in the corrosion behavior of superhydrophobic surfaces, two typical superhydrophobic surfaces (SHSs) were prepared on bare and oxidized aluminum substrates, respectively, and then were immersed into the NaCl aqueous solutions with different depths of ∼0 cm (hydrostatic pressure ∼0 kPa), 10 cm (1 kPa), and 150 cm (15 kPa). It was found out for the SHSs on the oxidized Al, as the hydrostatic pressure increased, the corrosion behavior became severe. However, for the SHSs on the bare Al, their corrosion behavior was complex due to hydrostatic pressure. It was found that the corrosion resistance under 1 kPa was the highest. Further mechanism analysis revealed that this alleviated corrosion behavior under 1 kPa resulted from suppressing the oxygen diffusion through the liquid and reducing the subsequent corrosion rate as compared with 0 kPa, whereas the relatively low hydrostatic pressure (HP) could stabilize the entrapped air and hence enhance the corrosion resistance, compared with 15 kPa. The present study therefore provided a fundamental understanding for the applications of SHSs to prevent the corrosion, especially for various vessels in deep water.
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Affiliation(s)
- J F Ou
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - X Z Fang
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - W J Zhao
- Key Laboratory of Marine Materials and Related Technologies , Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science , Ningbo 315201 , P. R. China
| | - S Lei
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - M S Xue
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - F J Wang
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - C Q Li
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - Y L Lu
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
| | - W Li
- School of Materials and Engineering , Jiangsu University of Technology , Changzhou 213001 , P. R. China
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114
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Fog-Harvesting Properties of Dryopteris marginata: Role of Interscalar Microchannels in Water-Channeling. Biomimetics (Basel) 2018; 3:biomimetics3020007. [PMID: 31105229 PMCID: PMC6352672 DOI: 10.3390/biomimetics3020007] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 03/31/2018] [Accepted: 04/09/2018] [Indexed: 11/30/2022] Open
Abstract
Several flora and fauna species found in arid areas have adapted themselves to collect water by developing unique structures and to intake the collected moisture. Apart from the capture of the moisture and fog on the surface, water transport and collection both play an important part in fog-harvesting systems as it prevents the loss of captured water through evaporation and makes the surface available for the capture of water again. Here, we report the remarkable fog collection and water-channeling properties of Dryopteris marginata. The surface of D. marginata has developed an integrated system of multiscale channels so that the water spreads quickly and is transported via these channels very efficiently. These integrated multiscale channels have also been replicated using a facile soft lithography technique to prepare biomimetic surfaces and it has been proved that it is the surface architecture that plays a role in the water transport rather than the material’s properties (waxes present on the surface of the leaves). Based on our studies, we infer that the microlevel hierarchy of the structures make the surface hydrophilic and the multiscale channels allow the efficient passage and transport of water. The understanding of the efficient and well-directed water transport and collection in D. marginata is expected to provide valuable insights to design efficient surfaces for fog-harvesting applications.
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