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Wan H, Teng H, Lv F, Lin J, Min J. Interface Wetting Driven by Laplace Pressure on Multiscale Topographies and Its Application to Performance Enhancement of Metal-Composite Hybrid Structure. ACS APPLIED MATERIALS & INTERFACES 2023; 15:18427-18439. [PMID: 36987883 DOI: 10.1021/acsami.2c22358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Surface topography reconstruction is extensively used to address the issue of weak bonding at the polymer-metal interface of metal-composite hybrid structure, while enhancement from this approach is seriously impaired by insufficient interface wetting. In this study, the wetting behavior of polymer on aluminum surfaces with multiscale topographies was theoretically and experimentally investigated to realize stable and complete wetting. Geometric dimensions of multiscale surface topographies have a notable impact on interfacial forces at the three-phase contact line of polymer/air/aluminum, and a competition exists between Laplace pressure and bubble pressure in dominating the wetting behavior. Laplace pressure facilitates the degassing of trapped air bubbles in grooves, bringing more robust interfacial wettability to grooves than dimples and grids. Conversely, dimples with excessive dimensions generate interfacial pores, and this intrinsic mechanism is theoretically unraveled. Moreover, different degrees of interface wetting cause variations in bonding strength of polymer-aluminum interface, which changes from ∼18% improvement to ∼17% reduction compared to original strength. Finally, groove topography perfectly achieved complete wetting between polymer and aluminum and consequently improved flexure performance by over 11% for the aluminum-carbon fiber hybrid side impact bar, which verifies the importance of complete wetting at a part scale. This study deepens the understanding of wetting behavior and clarifies the intrinsic correlation between interfacial bonding performance and surface topography.
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Affiliation(s)
- Hailang Wan
- School of Mechanical Engineering, Tongji University, Cao An Road 4800, Shanghai 201804, China
| | - Hao Teng
- School of Mechanical Engineering, Tongji University, Cao An Road 4800, Shanghai 201804, China
| | - Fangwei Lv
- School of Mechanical Engineering, Tongji University, Cao An Road 4800, Shanghai 201804, China
| | - Jianping Lin
- School of Mechanical Engineering, Tongji University, Cao An Road 4800, Shanghai 201804, China
- Shanghai Key Laboratory for A & D of Metallic Functional Material, Tongji University, Shanghai 200092, China
| | - Junying Min
- School of Mechanical Engineering, Tongji University, Cao An Road 4800, Shanghai 201804, China
- Shanghai Key Laboratory for A & D of Metallic Functional Material, Tongji University, Shanghai 200092, China
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Guo C, Wang C, Huang Q, Wang Z, Gong X, Ramakrishna S. 3D-printed spider-web structures for highly efficient water collection. Heliyon 2022; 8:e10007. [PMID: 35982846 PMCID: PMC9379566 DOI: 10.1016/j.heliyon.2022.e10007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 07/10/2022] [Accepted: 07/15/2022] [Indexed: 11/25/2022] Open
Abstract
Fog and moisture in nature are important freshwater resources, and the collection of these fog water is of great significance to arid regions. Inspired by the unique geometric structure of the spindle knot on spider silk, artificial fibers with periodic structures have been fabricated for water collection, which can effectively alleviate the problem of water shortage in arid areas. Traditional manufacturing methods are difficult to replicate the true shape of the spindle knot, and related research has encountered a bottleneck in improving water collection efficiency. 3D printing technology, which is different from traditional subtractive manufacturing, can directly replicate spider silk with periodic knots, making it possible to study water collection by artificial spider webs of various designs. Here, 3D printing technology is used to fabricate artificial spider webs with different geometric structures for efficient transportation and collection of water. In addition, the artificial spider web is treated with hydrophilic surfaces. In the humid environment for 2 h, the spider web with convex-concave multi-size spindle knots and multi-curvature connections has a maximum water collection capacity of 6.2g, and the mass of water collection is 35% higher than the existing best water collection artificial fibers. This work provides a sustainable and environmentally friendly route for the effective collection of humid air, and has certain reference value for the development of environmentally friendly water collection equipment.
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Affiliation(s)
- Chi Guo
- Jiangsu Totus Technology Co.,ltd., Changzhou, 213164, PR China
| | - Chengquan Wang
- Institute of Materials Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Qi Huang
- Jiangsu Totus Technology Co.,ltd., Changzhou, 213164, PR China
| | - Zhi Wang
- Jiangsu Totus Technology Co.,ltd., Changzhou, 213164, PR China
| | - Xiaojing Gong
- Institute of Materials Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Seeram Ramakrishna
- Center for Nanofibers and Nanotechnology, National University of Singapore, 117576, Singapore
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Zou X, Chen K, Yao H, Chen C, Lu X, Ding P, Wang M, Hua X, Shan A. Chemical Reaction and Bonding Mechanism at the Polymer-Metal Interface. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27383-27396. [PMID: 35648478 DOI: 10.1021/acsami.2c04971] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Polymer-metal hybrid structures have attracted significant attention recently due to their advantage of great weight reduction and excellent integrated physical/chemical properties. However, due to great physicochemical differences between polymers and metals, obtaining an interface with high bonding strength is a challenge, which makes it critically important to clarify the underlying bonding mechanisms. In the present research, we focused on revealing the underlying bonding mechanisms of a laminated Cr-coated steel-ethylene acrylic acid (EAA) strip prepared by hot roll bonding from the microscale to the molecular scale with experimental evidence. The microscale mechanical interlocking was analyzed and proven by scanning white light interferometry and scanning electron microscopy (SEM) by means of observing the surface and cross-sectional morphologies. Additionally, interfacial phases and chemical compositions were analyzed by transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). More directly and effectively, the interface was successfully exposed for X-ray photoelectron spectroscopy (XPS) analysis. Combined with time-of-flight secondary ion mass spectroscopy (ToF-SIMS) and depth profiling analysis, the formation of -(O═)C-O-Cr and -C-(O-Cr)2 covalent bonds through chemical reactions at the interface between -COOH and Cr2O3 was verified. Based on these characterization results, interfacial bonding mechanisms for the laminated Cr-coated steel-EAA strip were clearly identified to be chemical bonding and micromechanical interlocking, along with hydrogen bonding, which were all demonstrated with solid experimental evidence. In addition, 3D-render view and cross-section images of typical ion fragments at the interface were used to reveal the interfacial structure more comprehensively. The contributions of hydrogen bonds and covalent bonds to the interface were evaluated and compared for the first time. This study provides both methodological and theoretical guidance for investigating and understanding interfacial bonding formation in polymer-metal hybrid structures.
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Affiliation(s)
- Xin Zou
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Ke Chen
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Haining Yao
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Cong Chen
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Xueping Lu
- Shanghai Wangxun New Material Co., LTD, No. 1299, Pingan Road, Shanghai 201109, P. R. China
| | - Ping Ding
- Shanghai Wangxun New Material Co., LTD, No. 1299, Pingan Road, Shanghai 201109, P. R. China
| | - Min Wang
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Xueming Hua
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
- Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
| | - Aidang Shan
- School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P. R. China
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Song YY, Yu ZP, Dong LM, Zhu ML, Ye ZC, Shi YJ, Liu Y. Cactus-Inspired Janus Membrane with a Conical Array of Wettability Gradient for Efficient Fog Collection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13703-13711. [PMID: 34767375 DOI: 10.1021/acs.langmuir.1c02368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Fog collection plays an important role in alleviating the global water shortage. Despite great progress in creating bionic surfaces to collect fog, water droplets still could adhere to the microscale hydrophilic region and reach the thermodynamic stable state before falling, which delays the transport of water and hinders the continuous fog collection. Inspired by lotus leaves and cactuses, we designed a Janus membrane that functions to both collect fog from the air and transport it to a certain region. The Janus membrane with opposite wettability contains conical microcolumns with a wettability gradient and hydrophilic copper mesh surface. The apexes of conical microcolumns are superhydrophobic and the rest are hydrophobic. The fog droplets were deposited, coalesced, and directionally transported to the bottom of the conical microcolumns. Then, the droplets unidirectionally passed through the membrane and flowed into the water film on the surface of the copper mesh. The asymmetric structural and wettability merits endow the Janus membrane with an improved fog collection of ∼7.05 g/cm2/h. The study is valuable for designing and developing fluid control equipment in fog collection, liquid manipulation, and microfluidics.
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Affiliation(s)
- Yun-Yun Song
- School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, P. R. China
| | - Zhao-Peng Yu
- School of Automotive Engineering, Changshu Institute of Technology, No. 99 Hushan Road, Changshu, Suzhou 215500, P. R. China
| | - Li-Ming Dong
- School of Automotive Engineering, Changshu Institute of Technology, No. 99 Hushan Road, Changshu, Suzhou 215500, P. R. China
| | - Mao-Lin Zhu
- School of Automotive Engineering, Changshu Institute of Technology, No. 99 Hushan Road, Changshu, Suzhou 215500, P. R. China
| | - Zhi-Chun Ye
- School of Automotive Engineering, Changshu Institute of Technology, No. 99 Hushan Road, Changshu, Suzhou 215500, P. R. China
| | - Yuan-Ji Shi
- Department of Mechanical Engineering, Nanjing Institute of Industry Technology, Nanjing 210046, Jiangsu, P. R. China
| | - Yan Liu
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, P. R. China
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