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Guo R, Bao Y, Zheng X, Chen J, Yang H, Zhang W, Liu C, Xu J. Superhydrophobic and Photocatalytic Synergistic Self-Cleaning Coating Constructed by Hierarchically Structured Flower-like Hollow SiO 2@TiO 2 Spheres with Oxygen Vacancies. ACS APPLIED MATERIALS & INTERFACES 2023; 15:47447-47462. [PMID: 37768891 DOI: 10.1021/acsami.3c08571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
The self-cleaning coating has both superhydrophobic physical and photocatalytic chemical self-cleaning properties, which has attracted the wide attention of researchers in recent years. First, the flower-like hollow SiO2@TiO2 spheres with oxygen vacancies (rFHSTs) were prepared by the liquid-phase reduction method, in which several different functional components were integrated. Meanwhile, the influence mechanisms of the physical structure and chemical composition on the photocatalytic properties are discussed in detail. The results proved that rFHSTs exhibited the enhanced photoresponse range and photocatalytic degradation performance in visible light because of the synergistic effect of the microstructure (internal cavity, 3D flower-like nanosheet), SiO2/TiO2 heterojunction structure, and oxygen vacancies. After that, superhydrophobic modified rFHSTs were used as fillers to fabricate PVA/PFDTS-rFHSTs composite coatings with both physical and chemical self-cleaning properties. The self-cleaning performances and principles of the composite coating were examined and explored. The results showed that the low surface energy of the hydrophobic chain segment, the inherent particle effect, and the photocatalytic activity of rFHSTs were responsible for the superhydrophobic and photocatalytic effects, finally endowing the composite coating with self-cleaning performance. In short, this study is profound for the development and application of self-cleaning coatings with both physical and chemical performances.
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Affiliation(s)
- Ruyue Guo
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
| | - Yan Bao
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
| | - Xi Zheng
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
| | - Jie Chen
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
| | - Hong Yang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
| | - Wenbo Zhang
- Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, Shaanxi University of Science and Technology, Xi'an 710021, PR China
| | - Chao Liu
- Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, Shaanxi University of Science and Technology, Xi'an 710021, PR China
| | - Jiachen Xu
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, PR China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, PR China
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Lu L, Zhu L, Liu X, Li J. Self-cleaning mechanisms and laws of hydrophilic or hydrophobic surfaces of solar photovoltaic glass. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.09.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Advances in the Fabrication and Characterization of Superhydrophobic Surfaces Inspired by the Lotus Leaf. Biomimetics (Basel) 2022; 7:biomimetics7040196. [PMID: 36412724 PMCID: PMC9680393 DOI: 10.3390/biomimetics7040196] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/28/2022] [Accepted: 11/02/2022] [Indexed: 11/12/2022] Open
Abstract
Nature has proven to be a valuable resource in inspiring the development of novel technologies. The field of biomimetics emerged centuries ago as scientists sought to understand the fundamental science behind the extraordinary properties of organisms in nature and applied the new science to mimic a desired property using various materials. Through evolution, living organisms have developed specialized surface coatings and chemistries with extraordinary properties such as the superhydrophobicity, which has been exploited to maintain structural integrity and for survival in harsh environments. The Lotus leaf is one of many examples which has inspired the fabrication of superhydrophobic surfaces. In this review, the fundamental science, supported by rigorous derivations from a thermodynamic perspective, is presented to explain the origin of superhydrophobicity. Based on theory, the interplay between surface morphology and chemistry is shown to influence surface wetting properties of materials. Various fabrication techniques to create superhydrophobic surfaces are also presented along with the corresponding advantages and/or disadvantages. Recent advances in the characterization techniques used to quantify the superhydrophobicity of surfaces is presented with respect to accuracy and sensitivity of the measurements. Challenges associated with the fabrication and characterization of superhydrophobic surfaces are also discussed.
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Shao J, Huang Y, Zhao M, Yang Y, Zheng Y, Zhu R. Molecular Dynamics Simulation on the Wettability of Nanoscale Wrinkles: High Water Adhesion of Rose Petals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8854-8861. [PMID: 35834741 DOI: 10.1021/acs.langmuir.2c00974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the high water adhesion of rose petals is of great significance in artificial surface design. With all-atom molecular dynamics simulation, the wettability of nanoscale wrinkles was explored and compared to that of nanoscale strips with favorable hydrophobicity. The dewetting and wetting of gaps between nanoscale structures represent the Cassie-Baxter (CB) and Wenzel (WZ) states of the macroscopic droplet deposited on the textured surface, respectively. We uncovered the intermediate state, which is different from the CB and WZ states for wrinkles. Structures and free-energy profiles of metastable and transition states under various pressures were also investigated. Moreover, free-energy barriers for the (de)wetting transitions were quantified. On this basis, the roles of pressure and the unique structures of nanoscale wrinkles in the high water adhesion of rose petals were identified.
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Affiliation(s)
- Jinwei Shao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yinguo Huang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Meirong Zhao
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yong Yang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Yelong Zheng
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, People's Republic of China
| | - Rui Zhu
- Shanghai YangZhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center), School of Medicine, Tongji University, Shanghai 200092, China
- Shanghai University of Medicine and Health Sciences, 279 Zhouzhu Road, Shanghai 201318, China
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Liu X, Zhao X, Lu L, Li J. Liquid bridges between particles and the hydrophobic or hydrophilic surfaces of solar photovoltaic glass. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 822:153552. [PMID: 35114234 DOI: 10.1016/j.scitotenv.2022.153552] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/22/2022] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
Photovoltaic (PV) power generation technology is one of the most important methods for reaching the carbon peak and achieving carbon neutralization. Dust accumulation on the surface of PV glass greatly reduces the working performance and power generation efficiency of PVs. The hydrophobic or hydrophilic surfaces on the PV glass have substantial self-cleaning potential. In this study, the liquid bridges formed between particles and the hydrophobic or hydrophilic surfaces of solar PV glass are investigated. The effects of the liquid bridge force and the influencing factors for these two surfaces on particle dynamics behaviours are studied. Furthermore, the self-cleaning abilities of these two surfaces are also discussed. The results indicate that the liquid bridges formed between a particle and a hydrophilic PV glass placed horizontally or obliquely exhibit similar saddle shapes, but the liquid bridges wrap the particle on the surface of hydrophobic PV glass. The influence of the liquid bridges causes particles to adhere to the tilted hydrophilic or hydrophobic surfaces at liquid bridge volumes (VL) < 6 μL, making initially moving particles stay on these two tilted surfaces with 6 μL ≤ VL ≤ 20 μL and even achieving self-cleaning properties at VL > 20 μL. Both hydrophobic and hydrophilic surfaces increase the self-cleaning forces resulting from the liquid bridge formation with increasing VL, thus completing the self-cleaning process. Increasing the self-cleaning forces and decreasing the friction force and the liquid bridge force improves the self-cleaning abilities of the surface. These research findings have important theoretical significance and commercial engineering value in preventing and reducing dust accumulation on glass.
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Affiliation(s)
- Xueqing Liu
- State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Xiaodong Zhao
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Luyi Lu
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jianlan Li
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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6
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Mandal P, Ivvala J, Arora HS, Ghosh SK, Grewal HS. Bioinspired micro/nano structured aluminum with multifaceted applications. Colloids Surf B Biointerfaces 2022; 211:112311. [PMID: 34979496 DOI: 10.1016/j.colsurfb.2021.112311] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 11/26/2021] [Accepted: 12/26/2021] [Indexed: 10/19/2022]
Abstract
Inspired by many biological systems such as lotus leaves, insect wings and rose petals, great attention has been devoted to the study and fabrication of artificial superhydrophobic surfaces with multiple functionalities. In the present study, a simple and ecological synthesis route has been employed for large scale fabrication of self-assembled, sustainable nanostructures on unprocessed and micro imprinted aluminum surfaces named 'Nano' and 'Hierarchy'. The processed samples show extreme wettability ranging from superhydrophilicity to superhydrophobicity depending on post-processing conditions. The densely packed ellipsoidal nanostructures exhibited superhydrophobicity with excellent water, bacterial and dust repellency when modified by low surface energy material 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FOTES), characterized by a static contact angle of 163 ± 1° and contact angle hysteresis (CAH) ~3°. These coated surfaces show significant corrosion resistance with current density of 6 nA/cm2 which is 40 times lower than unprocessed counterpart and retain chemical stability after prolonged immersion in corrosive media. These surfaces show excellent self-cleaning ability with significantly low water consumption (< 0.1 µl/mm2-mg) and prevent biofouling which ensures its applicability in biological environment and marine components. The nanostructured superhydrophilic aluminum shows maximum antibacterial activity due to disruption of cell membrane. This work can offer a simple strategy to large scale fabrication of multifunctional biomimetic metallic surfaces.
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Affiliation(s)
- Priya Mandal
- Department of Physics, School of Natural Sciences, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Jayanth Ivvala
- Surface Science and Tribology Lab, Department of Mechanical Engineering, School of Engineering, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Harpreet S Arora
- Surface Science and Tribology Lab, Department of Mechanical Engineering, School of Engineering, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Sajal K Ghosh
- Department of Physics, School of Natural Sciences, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Harpreet S Grewal
- Surface Science and Tribology Lab, Department of Mechanical Engineering, School of Engineering, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India.
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Lu C, Gao Y, Yu S, Zhou H, Wang X, Li L. Non-Fluorinated Flexible Superhydrophobic Surface with Excellent Mechanical Durability and Self-Cleaning Performance. ACS APPLIED MATERIALS & INTERFACES 2022; 14:4750-4758. [PMID: 35029969 DOI: 10.1021/acsami.1c21840] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Although plenty of superhydrophobic surfaces have been developed owing to their tremendous potential applications, it is still a great challenge for the superhydrophobic surfaces to possess environmental friendliness, biocompatibility, and mechanical durability simultaneously. Herein, a non-fluorinated flexible superhydrophobic surface was designed by constructing a film-substrate system with labyrinth-like wrinkles combining an intrinsically hydrophobic Zn film and a polydimethylsiloxane (PDMS) substrate. Excellent superhydrophobicity with a contact angle up to 168.5° and a slide angle as low as 0° has been achieved on the Zn/PDMS surface, which is attributed to the micro-/nano-textured structures of the labyrinth-like wrinkles, providing sufficient air pockets to form a stable Cassie-Baxter state. Furthermore, the Zn/PDMS surface retains excellent superhydrophobicity under stretching, bending, and twisting mechanical deformation up to 500 cycles due to the stability of the micro-/nano-textured structures of the labyrinth-like wrinkles protected by the fantastic self-healing ability of the micro-cracks. Additionally, the Zn/PDMS superhydrophobic surface possesses an outstanding self-cleaning performance for various contaminants. The present work provides a valuable routine to design non-fluorinated flexible superhydrophobic surfaces with superb mechanical durability and self-cleaning property as promising functional layers for flexible electronics, wearable devices, biomedical engineering, and so forth.
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Affiliation(s)
- Chenxi Lu
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, P. R. China
| | - Yuan Gao
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, P. R. China
| | - Senjiang Yu
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, P. R. China
| | - Hong Zhou
- Department of Physics, China Jiliang University, Hangzhou 310018, P. R. China
| | - Xin Wang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, P. R. China
| | - Lingwei Li
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, P. R. China
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Chen J, Chen J, Li L, Wang S, Xie Y. Study on the self-cleaning phenomenon and anti-pollution flashover performance of micro-nanostructure superhydrophobic coating surface under a high humidity environment. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127552] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sow PK, Singhal R, Sahoo P, Radhakanth S. Fabricating low-cost, robust superhydrophobic coatings with re-entrant topology for self-cleaning, corrosion inhibition, and oil-water separation. J Colloid Interface Sci 2021; 600:358-372. [PMID: 34023697 DOI: 10.1016/j.jcis.2021.05.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/04/2021] [Accepted: 05/05/2021] [Indexed: 11/15/2022]
Abstract
HYPOTHESIS The superhydrophobic surfaces with re-entrant microstructures are known to provide robust superhydrophobicity by enhancing the energy barrier for Cassie-Baxter to Wenzel transition. However, the fabrication of such structured surfaces often involves sophisticated techniques and expensive ingredients. EXPERIMENTS Herein, a multifunctional, low-cost, and fluorine-free superhydrophobic coating with re-entrant surface topology was fabricated using fly ash (FA) and room-temperature-vulcanizing silicone. A systematic study was performed to evaluate the coating properties and durability. The robustness was evaluated as a function of particle size and inter-particle spacing. The performance in self-cleaning, corrosion inhibition and oil-water separation has been presented. FINDINGS The synthesized coatings are substrate-versatile and demonstrate superhydrophobic behavior. The close-packed coating of re-entrant FA particles attained via vibration compaction was seen to provide high robustness. The coatings retain their superhydrophobicity after multiple cycles of tape-peeling and exposure to environmental factors including temperature, pH, and UV radiation. These coatings exhibit excellent corrosion inhibition (corrosion efficiency > 99.999%), outperforming the majority of the previously reported superhydrophobic coatings. It also displays excellent self-cleaning property and high separation efficiencies in oil-water separation (>99%). We envision that such FA-based superhydrophobic coatings can solve the issues of synthesizing cheaper, sustainable, and robust superhydrophobic surfaces while simultaneously opening new avenues for FA utilization.
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Affiliation(s)
- Pradeep Kumar Sow
- Department of Chemical Engineering, BITS Pilani, K. K. Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Richa Singhal
- Department of Chemical Engineering, BITS Pilani, K. K. Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Priyanka Sahoo
- Department of Chemical Engineering, BITS Pilani, K. K. Birla Goa Campus, Zuarinagar, Goa 403726, India
| | - Shriram Radhakanth
- Department of Chemical Engineering, BITS Pilani, K. K. Birla Goa Campus, Zuarinagar, Goa 403726, India
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Ren S, Wang S, Dong Z, Chen J, Li L. Dynamic behaviors and self-cleaning property of droplet on superhydrophobic coating in uniform DC electric field. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Wang L, Xiao X, Liu E, Yu S, Yin X, Wang J, Zhu G, Li Q, Li J. Fabrication of superhydrophobic needle-like Ca-P coating with anti-fouling and anti-corrosion properties on AZ31 magnesium alloy. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126568] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Yilbas BS, Abubakar AA, Ali H, Al-Sharafi A, Sahin AZ, Sunar M, Al-Qahtani H. Impacting Water Droplets Can Alleviate Dust from Slanted Hydrophobic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4355-4369. [PMID: 33789039 DOI: 10.1021/acs.langmuir.1c00436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Water droplet impacting on a slanted dusty hydrophobic surface is examined in relation to dust mitigation from surfaces. Impacting droplet characteristics including droplet spreading/retraction rates, slipping length, and rebound heights are analyzed via high-speed recording and a tracker program. The environmental dust characteristics in terms of size, shape, elemental composition, and surface free energy are evaluated by adopting the analytical methods. The findings reveal that the dynamic characteristics of the impacting droplet on the slanted hydrophobic surface are significantly influenced by the dust particles. The maximum droplet spreading over the dusty surface becomes smaller than that of the nondusty surface. The presence of the dust particles on the slanted hydrophobic surface increases energy dissipation, and the water droplet slipping length over the surface becomes less than that corresponding to the nondusty surface. Impacting droplet fluid infuses over the dust particle surface, which enables mitigation of dust from the surface to the droplet fluid. A dust-mitigated area on the slanted surface is larger than that corresponding to the horizontal surface; in which case, the area ratio becomes almost six-fold, which slightly reduces with increasing Weber number. The optical transmittance of the dust-mitigated surface by the impacting droplet remains high.
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Affiliation(s)
- Bekir S Yilbas
- Mechanical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia
- Center of Research Excellence in Renewable Energy (CoRE-RE), KFUPM, Dhahran 31261, Saudi Arabia
- Senior Researcher at K.A.CARE Energy Research & Innovation Center, Dhahran 31261, Saudi Arabia
| | - Abba A Abubakar
- Mechanical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia
| | - Haider Ali
- DHA Suffa University, Karacity City 75500, Pakistan
| | - Abdullah Al-Sharafi
- Mechanical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia
- Researcher at K.A.CARE Energy Research & Innovation Center, Dhahran 31261, Saudi Arabia
| | - Ahmet Z Sahin
- Mechanical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia
| | - Mehmet Sunar
- Yildirim Beyazit Universitesi, Ankara 06760, Turkey
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Lin C, Xie J, Li W. Measuring the micromechanical properties of oesophageal mucosa with atomic force microscopy. BIOSURFACE AND BIOTRIBOLOGY 2020. [DOI: 10.1049/bsbt.2020.0015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Chengxiong Lin
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
- National Engineering Research Center for Healthcare DevicesGuangdong Key Lab of Medical Electronic Instruments and Polymer Material ProductsGuangdong Institute of Medical InstrumentsGuangzhouGuangdong510500People's Republic of China
| | - Jingyang Xie
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
| | - Wei Li
- Key Laboratory for Advanced Technology of Materials of Ministry of EducationTribology Research InstituteSouthwest Jiaotong UniversityChengdu610031People's Republic of China
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14
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Sun D, Böhringer KF. An active self-cleaning surface system for photovoltaic modules using anisotropic ratchet conveyors and mechanical vibration. MICROSYSTEMS & NANOENGINEERING 2020; 6:87. [PMID: 34567697 PMCID: PMC8433153 DOI: 10.1038/s41378-020-00197-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 07/01/2020] [Accepted: 07/03/2020] [Indexed: 05/02/2023]
Abstract
The purpose of this work is to develop an active self-cleaning system that removes contaminants from a solar module surface by means of an automatic, water-saving, and labor-free process. The output efficiency of a solar module can be degraded over time by dust accumulation on top of the cover glass, which is often referred to as "soiling". This paper focuses on creating an active self-cleaning surface system using a combination of microsized features and mechanical vibration. The features, which are termed anisotropic ratchet conveyors (ARCs), consist of hydrophilic curved rungs on a hydrophobic background. Two different ARC systems have been designed and fabricated with self-assembled monolayer (SAM) silane and fluoropolymer thin film (Cytop). Fabrication processes were established to fabricate these two systems, including patterning Cytop without degrading the original Cytop hydrophobicity. Water droplet transport characteristics, including anisotropic driving force, droplet resonance mode, cleaning mechanisms, and system power consumption, were studied with the help of a high-speed camera and custom-made test benches. The droplet can be transported on the ARC surface at a speed of 27 mm/s and can clean a variety of dust particles, either water-soluble or insoluble. Optical transmission was measured to show that Cytop can improve transmittance by 2.5~3.5% across the entire visible wavelength range. Real-time demonstrations of droplet transport and surface cleaning were performed, in which the solar modules achieved a 23 percentage-point gain after cleaning.
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Affiliation(s)
- Di Sun
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA 98195 USA
- Institute for Nano-Engineered Systems, University of Washington, Seattle, WA 98195 USA
| | - Karl F. Böhringer
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA 98195 USA
- Institute for Nano-Engineered Systems, University of Washington, Seattle, WA 98195 USA
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15
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Wang N, Wang Q, Xu S, Zheng X. Mechanical Stability of PDMS-Based Micro/Nanotextured Flexible Superhydrophobic Surfaces under External Loading. ACS APPLIED MATERIALS & INTERFACES 2019; 11:48583-48593. [PMID: 31790573 DOI: 10.1021/acsami.9b17901] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Superhydrophobicity based on the micro- and nanostructures is frangible to external loading. It is a challenging issue for flexible superhydrophobic surfaces to maintain superhydrophobicity while deforming under external loading. Herein, PDMS-based micro/nanotextured flexible surfaces with robust superhydrophobicity were fabricated by an effective and environmentally friendly method. The formation mechanism of the micro/nanotextured structures and the formation reason for superhydrophobicity were investigated. The effects of reaction time on wettability were also explored. Besides, the changes of morphology and superhydrophobicity under external loading were studied. It is found that micro/nanotextured structures remained unchanged, and only the bottom layer generated cracks under external loading. There were no obvious changes of superhydrophobicity under a tensile strain up to breakage, 500 cycles of bending, and 100 cm height of water droplets and NaCl particle impact. The self-cleaning property was also verified in cleaning the surfaces covered with various contaminants by water droplets. The fabricated PDMS-based micro/nanotextured flexible surfaces with good mechanical stability and self-cleaning property are expected to be applied in flexible electronic devices.
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Affiliation(s)
- Ning Wang
- Institute of NanoEngineering, College of Civil Engineering and Architecture , Shandong University of Science and Technology , Qingdao 266590 , P. R. China
| | - Qing Wang
- Institute of NanoEngineering, College of Civil Engineering and Architecture , Shandong University of Science and Technology , Qingdao 266590 , P. R. China
| | - Shuangshuang Xu
- Institute of NanoEngineering, College of Civil Engineering and Architecture , Shandong University of Science and Technology , Qingdao 266590 , P. R. China
| | - Xu Zheng
- Institute of NanoEngineering, College of Civil Engineering and Architecture , Shandong University of Science and Technology , Qingdao 266590 , P. R. China
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16
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Sun D, Böhringer KF. Self-Cleaning: From Bio-Inspired Surface Modification to MEMS/Microfluidics System Integration. MICROMACHINES 2019; 10:E101. [PMID: 30704097 PMCID: PMC6412494 DOI: 10.3390/mi10020101] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/22/2019] [Accepted: 01/28/2019] [Indexed: 11/16/2022]
Abstract
This review focuses on self-cleaning surfaces, from passive bio-inspired surface modification including superhydrophobic, superomniphobic, and superhydrophilic surfaces, to active micro-electro-mechanical systems (MEMS) and digital microfluidic systems. We describe models and designs for nature-inspired self-cleaning schemes as well as novel engineering approaches, and we discuss examples of how MEMS/microfluidic systems integrate with functional surfaces to dislodge dust or undesired liquid residues. Meanwhile, we also examine "waterless" surface cleaning systems including electrodynamic screens and gecko seta-inspired tapes. The paper summarizes the state of the art in self-cleaning surfaces, introduces available cleaning mechanisms, describes established fabrication processes and provides practical application examples.
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Affiliation(s)
- Di Sun
- Department of Electrical & Computer Engineering, University of Washington, Seattle, WA 98105, USA.
| | - Karl F Böhringer
- Department of Electrical & Computer Engineering, University of Washington, Seattle, WA 98105, USA.
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17
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Ai J, Guo Z. Biomimetic polymeric superamphiphobic surfaces: their fabrication and applications. Chem Commun (Camb) 2019; 55:10820-10843. [DOI: 10.1039/c9cc03813b] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In this review, we summarize recent developments in polymeric superamphiphobic surfaces, including their design, fabrication, and potential applications.
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Affiliation(s)
- Jixin Ai
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
- Hubei University
- Wuhan 430062
- People's Republic of China
- State Key Laboratory of Solid Lubrication
| | - Zhiguang Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
- Hubei University
- Wuhan 430062
- People's Republic of China
- State Key Laboratory of Solid Lubrication
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18
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Testing the self-cleaning properties of a coordination polymer surface. ADSORPTION 2018. [DOI: 10.1007/s10450-018-9987-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Boguslavsky Y, Shemesh M, Friedlander A, Rutenberg R, Filossof AM, Buslovich A, Poverenov E. Eliminating the Need for Biocidal Agents in Anti-Biofouling Polymers by Applying Grafted Nanosilica Instead. ACS OMEGA 2018; 3:12437-12445. [PMID: 31457975 PMCID: PMC6645711 DOI: 10.1021/acsomega.8b01438] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/22/2018] [Indexed: 05/07/2023]
Abstract
A nondestructive one-step approach was applied for grafting biocide-free monodispersed silica nanoparticles (SNPs) with a diameter of 30 ± 10 nm on polystyrene, polyethylene, and polyvinyl chloride surfaces. The prepared surfaces were comprehensively characterized using spectroscopic (Fourier transform infrared attenuated total reflection, ultraviolet-visible, and X-ray photoelectron spectroscopy) and microscopic (high-resolution scanning electron microscopy and atomic force microscopy) methods. The modified polymers were found to maintain their original mechanical and physical properties, while their nanoroughness on the other hand had risen by 1.6-2.7 times because of SNP grafting. The SNP-grafted surfaces displayed anti-biofouling properties, resulting in a significant reduction in the attached Gram-positive Bacillus licheniformis or Gram-negative Pseudomonas aeruginosa bacteria compared to their nongrafted counterparts. Confocal laser scanning microscopy and scanning electron microscopy studies have confirmed that bacterial cells could not successfully adhere onto the SNP-grafted polymer films regardless of the polymer type, and their biofilm formation was therefore damaged. The presented facile and straightforward protocol allows eliminating the need for biocidal agents and resorts to grafted nanosilica instead. This strategy may serve as a feasible and safe platform for the development of sustainable anti-biofouling surfaces in biomedical devices; food, water, and air treatment systems; and industrial equipment.
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Affiliation(s)
- Yonit Boguslavsky
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Moshe Shemesh
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Alon Friedlander
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Biofilm
Research Laboratory, Hadassah School of Dental Medicine, The Hebrew University, POB 12272, Jerusalem 91120, Israel
| | - Roi Rutenberg
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Institute
of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty
of Agriculture, Food and Environment, The
Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Anat Molad Filossof
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Aviva Buslovich
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Department
of Chemistry, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Elena Poverenov
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
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20
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Fenero M, Palenzuela J, Azpitarte I, Knez M, Rodríguez J, Tena-Zaera R. Laponite-Based Surfaces with Holistic Self-Cleaning Functionality by Combining Antistatics and Omniphobicity. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39078-39085. [PMID: 29039644 DOI: 10.1021/acsami.7b13535] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present work, perfluoroalkylated laponite nanoparticles with a high degree of functionalization (60 wt %) have been prepared and a methodology to prepare transparent, antistatic, and omniphobic laponite-based films with holistic self-cleaning properties against liquids, solids and liquid-solid mixtures has been developed. The intrinsic electrical and ionic conductivities observed in unmodified laponite coatings are combined with perfluoroalkyl-modified laponite clays. As a result, films with improved self-cleaning functionality based on dust-repellency and omniphobic liquid-repellence (sheet resistance in the range of 107 Ω/□ and contact angles of 106° (H2O) and 93° (oil)) were obtained. These unique films, being capable to repel dust and liquids, were applied to a variety of substrates (i.e., glass and plastics) and tested against solids and liquids of different nature with excellent performance. Bending tests of these holistic self-cleaning films deposited over flexible substrates showed better mechanical performance than unmodified laponite films.
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Affiliation(s)
- Marta Fenero
- IK4-CIDETEC , Parque Tecnológico de San Sebastián, Paseo Miramón, 196, 20014 Donostia - San Sebastián, Spain
| | - Jesús Palenzuela
- IK4-CIDETEC , Parque Tecnológico de San Sebastián, Paseo Miramón, 196, 20014 Donostia - San Sebastián, Spain
| | - Itxasne Azpitarte
- CIC nanoGUNE , Tolosa Hiribidea, 76, 20018 Donostia - San Sebastián, Spain
| | - Mato Knez
- CIC nanoGUNE , Tolosa Hiribidea, 76, 20018 Donostia - San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science , Maria Díaz de Haro 3, 48013 Bilbao, Spain
| | - Javier Rodríguez
- IK4-CIDETEC , Parque Tecnológico de San Sebastián, Paseo Miramón, 196, 20014 Donostia - San Sebastián, Spain
| | - Ramón Tena-Zaera
- IK4-CIDETEC , Parque Tecnológico de San Sebastián, Paseo Miramón, 196, 20014 Donostia - San Sebastián, Spain
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21
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Dong J, Jin Y, Dong H, Sun L. Numerical Calculation Method of Apparent Contact Angles on Heterogeneous Double-Roughness Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10411-10418. [PMID: 28885028 DOI: 10.1021/acs.langmuir.7b02564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Double-roughness surfaces can be used to mimic lotus surfaces. The apparent contact angles (ACAs) of droplets on these surfaces were first calculated by Herminghaus. Then Patankar utilized the pillar model to improve the Herminghaus approach and put forward the formulas for ACAs calculation of the homogeneous double-roughness surfaces where the dual-scale structures and the bases were the same wettable materials. In this paper, we propose a numerical calculation method of ACAs on the heterogeneous double-roughness surfaces where the dual-scale structures and the bases are made of different wettable materials. This numerical calculation method has successfully enhanced the Herminghaus approach. It is promising to become a novel design approach of heterogeneous superhydrophobic surfaces, which are frequently applied in technical fields of self-cleaning, anti-icing, antifogging, and enhancing condensation heat transfer.
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Affiliation(s)
- Jian Dong
- Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou, 310014, China
| | - Yanli Jin
- Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou, 310014, China
| | - He Dong
- Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou, 310014, China
| | - Li Sun
- Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou, 310014, China
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22
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Chung DK, Huynh SH, Katariya M, Chan AYC, Wang S, Jiang X, Muradoglu M, Liew OW, Ng TW. Drops on a Superhydrophobic Hole Hanging On under Evaporation. ACS OMEGA 2017; 2:6211-6222. [PMID: 31457866 PMCID: PMC6644627 DOI: 10.1021/acsomega.7b01114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 09/15/2017] [Indexed: 05/04/2023]
Abstract
Drops with larger volumes placed over a superhydrophobic (SH) surface with a hole do not fall through unless they are evaporated to a size that is small enough. This feature offers the ability to preconcentrate samples for biochemical analysis. In this work, the influence of pinning on the behavior of drops placed on a 0.1 mm thick SH substrate with a 2 mm diameter hole as they evaporated was investigated. With 16 μL of water dispensed, the sessile drop component volume was initially higher than that of the overhanging drop component and maintained this until the later stages where almost identical shapes were attained and full evaporation was achieved without falling off the hole. With 15 μL of water dispensed, the volume of the sessile drop was initially higher than that of the overhanging drop component but the liquid body was able to squeeze through the hole after 180 s due to the contact line not having sufficient pinning strength when it encountered the edge of the hole. This resulted in the liquid body either falling through the hole or remaining pinned with an oval-like shape. When it did not fall-off, the liquid body had volume and contact angle characteristics for the sessile drop and overhanging drop components that were reversed. In the later stages, however, nearly identical shapes were again attained and full evaporation was achieved without falling off the hole. The effects of pinning, despite the substrate being SH, offer another path toward achieving practical outcomes with liquid bodies without the need for chemical surface functionalization. Similarities and differences could be seen in the behavior of a sessile drop on a SH plate that was inclined at 30° to the horizontal and evaporated.
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Affiliation(s)
- Dwayne
Chung Kim Chung
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - So Hung Huynh
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Mayur Katariya
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Aaron Yin Chun Chan
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Shufen Wang
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Xuchuan Jiang
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Murat Muradoglu
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Oi Wah Liew
- Cardiovascular
Research Institute, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System,
Centre for Translational Medicine, 14 Medical Drive, 117599 Singapore
| | - Tuck Wah Ng
- Department of Mechanical &
Aerospace Engineering, Laboratory
for Optics and Applied Mechanics and Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia
- E-mail: . Tel: 61-3-99054647. Fax: 61-3-99051825
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23
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Xiang Y, Si Y, Xin Y, Guo Z. One-step Strategy to Prepare Utility ZnO–Stearic Acid (STA) Superhydrophobic Nanocoating. CHEM LETT 2017. [DOI: 10.1246/cl.170545] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yun Xiang
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, P. R. China
| | - Yifan Si
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, P. R. China
| | - Yan Xin
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, P. R. China
| | - Zhiguang Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, P. R. China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, P. R. China
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24
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Quan YY, Zhang LZ, Qi RH, Cai RR. Self-cleaning of Surfaces: the Role of Surface Wettability and Dust Types. Sci Rep 2016; 6:38239. [PMID: 27917900 PMCID: PMC5137015 DOI: 10.1038/srep38239] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 11/07/2016] [Indexed: 11/09/2022] Open
Abstract
The self-cleaning property is usually connected to superhydrophobic surfaces (SHSs) where the dust particles can be easily removed by the rolling motion of droplets. It seems that superhydrophobicity (its durability is questionable nowadays) is a necessity. However here, it is disclosed that self-cleaning can also be realized on an ordinary surface by droplet impinging. The effects of surface wettability and the types of dust particles are considered. The self-cleaning is realized by two steps: (1) the pickup of particles by the water-air interface of an impinging droplet, (2) the release of the impinging droplets from the surface. It can be observed that only the trailing edges of the droplets can pick up particles when the droplets recoil from the inclined surfaces. The hydrophilic surface can also achieve self-cleaning under some conditions. This interesting finding may be helpful for the successful implementation of self-cleaning with common surfaces.
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Affiliation(s)
- Yun-Yun Quan
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Li-Zhi Zhang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.,State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China
| | - Rong-Hui Qi
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Rong-Rong Cai
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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25
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Hybrid MWCNTs membrane with well-tunable wettability. J Colloid Interface Sci 2016; 484:173-182. [DOI: 10.1016/j.jcis.2016.08.084] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 08/30/2016] [Accepted: 08/31/2016] [Indexed: 11/22/2022]
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26
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Si Y, Guo Z, Liu W. A Robust Epoxy Resins @ Stearic Acid-Mg(OH)2 Micronanosheet Superhydrophobic Omnipotent Protective Coating for Real-Life Applications. ACS APPLIED MATERIALS & INTERFACES 2016; 8:16511-20. [PMID: 27265834 DOI: 10.1021/acsami.6b04668] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Superhydrophobic coating has extremely high application value and practicability. However, some difficult problems such as weak mechanical strength, the need for expensive toxic reagents, and a complex preparation process are all hard to avoid, and these problems have impeded the superhydrophobic coating's real-life application for a long time. Here, we demonstrate one kind of omnipotent epoxy resins @ stearic acid-Mg(OH)2 superhydrophobic coating via a simple antideposition route and one-step superhydrophobization process. The whole preparation process is facile, and expensive toxic reagents needed. This omnipotent coating can be applied on any solid substrate with great waterproof ability, excellent mechanical stability, and chemical durability, which can be stored in a realistic environment for more than 1 month. More significantly, this superhydrophobic coating also has four protective abilities, antifouling, anticorrosion, anti-icing, and flame-retardancy, to cope with a variety of possible extreme natural environments. Therefore, this omnipotent epoxy resins @ stearic acid-Mg(OH)2 superhydrophobic coating not only satisfies real-life need but also has great application potential in many respects.
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Affiliation(s)
- Yifan Si
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University , Wuhan 430062, People's Republic of China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, People's Republic of China
| | - Zhiguang Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University , Wuhan 430062, People's Republic of China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, People's Republic of China
| | - Weimin Liu
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, People's Republic of China
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27
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Lei H, Xiao J, Zheng L, Xiong M, Zhu Y, Qian J, Zhuang Q, Han Z. Superhydrophobic coatings based on colloid silica and fluorocopolymer. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.01.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Yamamoto M, Nishikawa N, Mayama H, Nonomura Y, Yokojima S, Nakamura S, Uchida K. Theoretical Explanation of the Lotus Effect: Superhydrophobic Property Changes by Removal of Nanostructures from the Surface of a Lotus Leaf. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7355-7363. [PMID: 26075949 DOI: 10.1021/acs.langmuir.5b00670] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Theoretical study is presented on the wetting behaviors of water droplets over a lotus leaf. Experimental results are interpreted to clarify the trade-offs among the potential energy change, the local pinning energy, and the adhesion energy. The theoretical parameters, calculated from the experimental results, are used to qualitatively explain the relations among surface fractal dimension, surface morphology, and dynamic wetting behaviors. The surface of a lotus leaf, which shows the superhydrophobic lotus effect, was dipped in ethanol to remove the plant waxes. As a result, the lotus effect is lost. The contact angle of a water drop decreased dramatically from 161° of the original surface to 122°. The water droplet was pinned on the surface. From the fractal analysis, the fractal region of the original surface was divided into two regions: a smaller-sized roughness region of 0.3-1.7 μm with D of 1.48 and a region of 1.7-19 μm with D of 1.36. By dipping the leaf in ethanol, the former fractal region, characterized by wax tubes, was lost, and only the latter large fractal region remained. The lotus effect is attributed to a surface structure that is covered with needle-shaped wax tubes, and the remaining surface allows invasion of the water droplet and enlarges the interaction with water.
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Affiliation(s)
- Minehide Yamamoto
- †Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194, Japan
| | - Naoki Nishikawa
- ‡Mitsuboshi Belting Ltd., 4-1-21 Hamazoe-dori, Nagata-ku, Kobe 653-0024, Japan
| | - Hiroyuki Mayama
- §Research Institute for Electronic Science, Hokkaido University, N21, W10 Kita-ku, Sapporo 001-0021, Japan
| | - Yoshimune Nonomura
- ∥Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Satoshi Yokojima
- ⊥RIKEN Research Cluster for Innovation, Nakamura Laboratory, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- #School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Shinichiro Nakamura
- ⊥RIKEN Research Cluster for Innovation, Nakamura Laboratory, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Kingo Uchida
- †Department of Materials Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194, Japan
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29
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Song D, Song B, Hu H, Du X, Zhou F. Selectively splitting a droplet using superhydrophobic stripes on hydrophilic surfaces. Phys Chem Chem Phys 2015; 17:13800-3. [DOI: 10.1039/c5cp01530h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The droplet can be split by impinging on the hybrid hydrophobic–hydrophilic surface at a high velocity.
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Affiliation(s)
- Dong Song
- School of Marine Science and Technology
- Northwestern Polytechnical University
- Xi'an
- P. R. China
| | - Baowei Song
- School of Marine Science and Technology
- Northwestern Polytechnical University
- Xi'an
- P. R. China
| | - Haibao Hu
- School of Marine Science and Technology
- Northwestern Polytechnical University
- Xi'an
- P. R. China
| | - Xiaosong Du
- Microproducts Breakthrough Institute
- Corvallis
- USA
| | - Feng Zhou
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
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30
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Zhang S, Ouyang X, Li J, Gao S, Han S, Liu L, Wei H. Underwater drag-reducing effect of superhydrophobic submarine model. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 31:587-593. [PMID: 25496725 DOI: 10.1021/la504451k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
To address the debates on whether superhydrophobic coatings can reduce fluid drag for underwater motions, we have achieved an underwater drag-reducing effect of large superhydrophobic submarine models with a feature size of 3.5 cm × 3.7 cm × 33.0 cm through sailing experiments of submarine models, modified with and without superhydrophobic surface under similar power supply and experimental conditions. The drag reduction rate reached as high as 15%. The fabrication of superhydrophobic coatings on a large area of submarine model surfaces was realized by immobilizing hydrophobic copper particles onto a precross-linked polydimethylsiloxane (PDMS) surface. The pre-cross-linking time was optimized at 20 min to obtain good superhydrophobicity for the underwater drag reduction effect by investigating the effect of pre-cross-linking on surface wettability and water adhesive property. We do believe that superhydrophobic coatings may provide a promising application in the field of drag-reducing of vehicle motions on or under the water surface.
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Affiliation(s)
- Songsong Zhang
- Key Laboratory of Superlight Materials and Surface Technology of the Ministry of Education and ‡Institute of Advanced Marine Materials, Harbin Engineering University , Harbin 150001, PR China
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