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Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 410-416页

作者：史雪婷 ZHU Yali LIU Yanhua 冯利邦 School of Materials Science and Engineering Lanzhou Jiaotong University

Magnesium alloys with superhydrophobicity are constructed by controlling rough surface structure and grafting long hydrophobic alkyl chains. Changes of morphology, phase structure, chemical composition as well as wettability, corrosion resistance of superhydrophobic magnesium alloy upon immersing in corrosive media are investigated comparatively. Meanwhile, the contaminating particles on as-prepared superhydrophobic surfaces can be taken away easily by rolling water droplets. Therefore, the results show that as-prepared superhydrophobic magnesium alloys exhibit enhanced corrosion resistance and self-healing performance. Finally, anti-corrosion and self-cleaning mechanisms are deduced. It can be concluded that it is an effective strategy of preparing superhydrophobic surfaces for improving the corrosion resistance and selfcleaning performance of magnesium alloys.

关键词： magnesium alloy superhydrophobicity anti-corrosion self-cleaning

self-cleaning Anti-fouling TiO2/Poly(aryl ether sulfone) Composite Ultrafiltration Membranes

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Chemical Research in Chinese Universities 2019年第4期35卷 714-720页

作者： JIANG Hongchuan YANG Xia FENG Yong WANG Xinyu GENG Zhi HUO Mingxin Jilin Engineering Lab for Water Pollution Control and Resources Recovery College of EnvironmentNortheast Normal UniversityChangchun 130117P.R.China

A series of novel TiO2/poly(aryl ether sulfone) ultrafiltration membranes with anti-fouling and self-cleaning properties was designed and prepared. First, anti-photocatalytic degraded fluorine contained polv(aryl ether sulfone) matrix(PAES-F) was synthesized. Then the composite membranes were prepared via TiO2 nanopartides and PAES-F polymer matrix by solution blending and non-solvent induced phase inversion methods. Further, separation efficiency, fouling behavior and self-cleaning property of the composite ultrafiltration(UF) membranes were investigated by dead-end filtration experiments using a polyacn lamide solution. The composite UF membranes exhibited outstanding self-cleaning efficiency and anti-photocatalytic degraded property after exposure to simulated sunliglit irradiation.The water flux recovery ratios(FRR)of the optimal composite UF membranes could reach 74.24%, which was attributable to photocatalytic degradation of the organic contaminant by TiO2. And the retention rates of the composite UF membranes could maintain over 97%, which indicated the excellent photocatalytic degradation resistance of the fluorine contained PAES-F matrix. The novel high perfomiance composite UF membranes have a broad application prospect in water treatment.

关键词： Poly(aryl ether sulfone) Ultrafiltration Anti-fouling self-cleaning Titanium dioxide

Gecko-inspired composite micro-pillars with both robust adhesion and enhanced dry self-cleaning property

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Chinese Chemical Letters 2019年第12期30卷 2333-2337页

作者： Xiaoxiao Dong Hong Zhao Zhihang Wang Miray Ouzounian Travis Shihao Hu Yongjian Guo Lipeng Zhang Quan Xu College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing 102249China Department of Mechanical Engineering California State UniversityLos AngelesCA 90032United States Energy College Beijing University of Chemical TechnologyBeijing 100029China

self-cleaning surfaces are desirable in many engineering applications where low energy consumption,reusability and sustainability are of the biggest concerns.Inspired by the gecko’s unique ’dry selfcleaning’ hierarchical structures.Here we fabricated artificial Fe304/PDMS composites that show robust self-cleaning capabilities.The enhanced adhesion performance is attributable to the decrease of PDMS polymerization degree and the load transfer between PDMS matrix and Fe304 magnetic particles.The self-cleaning surfaces showed up to 24.3% self-cleaning rate with as few as 4 steps.Simulation result indicated that the changing of cross linking between Fe304 and PDMS is the main reason for the enhanced self-cleaning surfaces.This work reveals an alternative route of making high-performance self-cleaning smart surfaces that are applicable in the textile industry,robotic locomotion/gripping technology,outerspace explorations and tissue engineering.

关键词： Geock Dry adhesion self-cleaning PDMS Fe3O4 Composites

Transparent Coating with TiO2 Nanorods for High-performance Photocatalytic self-cleaning and Environmental Remediation

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Chemical Research in Chinese Universities 2020年第6期36卷 1097-1101页

作者： JIANG Wenshuai ZONG Xupeng WANG Xiayan SUN Zaicheng Center of Excellence for Environmental Safety and Biological Effects Beijing Key Laboratory for Green Catalysis and SeparationDepartment of Chemistry and BiologyBeijing University of TechnologyBeijing 100124P.R.China

High-performance self-cleaning coatings are highly desired by the industry and market.Herein,we synthesized two kinds of ultrafine TiO2 nanocrystals,one is anatase dots with a diameter of 5 nm,and the other is rutile rods with 1.5 nm in width and 7 nm in length.The prepared TiO:nanocrystal is highly dispersed and stable in water over a month.The coating can be fabricated via a simple spraving method,displaying excellent optical properties and photocatalytic performance on self-cleaning and surrounding environment remediation.The transmittance of glass remains 80%-90%for visible and near-infrared light after 30 cycles of spray.RhB solution(50 mg/L)was applied to the coating surface and form a solid RhB layer was formed,which can be completely removed in 30 min's light irradiation.RhB aqueous solution(100 mL,5 mg/L)was purified after 180 min by a 10 cm×10 cmglass,on which the coating was sprayed 30 times.The concentrations of formaldehyde and PM2.5 in surrounding air displayed a significant decrease along 50 min's monitoring.This high-performance coating shows great potential for constructing functional coating on various substrates for industrial applications.

关键词： TiO2 Photocatalysis Transparent coating self-cleaning Environment remediation

Experimental study on blocking and self-cleaning behaviors of beam dam in debris flow hazard mitigation

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International Journal of Sediment Research 2018年第4期33卷 395-405页

作者： Hao Sun Yong You Jinfeng Liu Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Blocking is one of the important features when a beam dam intercepts debris flow, while self-cleaning is another when managing suspended debris flow. Both features determine the debris flow control benefits of beam dam but the latter often is not considered in practical engineering design. In this paper, a series of specially designed flume experiments were done to simulate blocking and self-cleaning processes. The blocking ratio and deposition features were measured to contrast the blocking and self-cleaning performance before and after artificial self-cleaning. The experimental results reveal that the beam dam net opening, particle diameter of sediment, sediment concentration, and gradient of the channel are the main factors affecting blocking performance. A new criterion of blocking performance of beam dams that considers the interaction of multiple factors and can provide guidance to practical project design is proposed. For all three types of blocking, sediment deposited upstream of a beam dam can be effectively transported downstream by erosion from post-debris-flow floods, self-cleaning performance is most efficient for temporary blocking, followed by partial-blocking, and total-blocking. The efficiency of selfcleaning largely depends on the change of the sediment deposit due to erosion. Finally, a discussion is given for the optimal design of an open-type check dam and the feasibility of synergistic effects of selfcleaning in combination with artificial cleaning. Some supporting artificial silt-cleaning should be implemented in practice. A beam dam will, thus, have more storage capacity with which to control the next debris flow event.

关键词： Debris flow Beam dam Critical blocking criterion self-cleaning Flume experiment

Sol-Gel Preparation of TiO2/SiO2 Nanocomposites and Their Application in self- cleaning Textiles

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Journal of Donghua University(English Edition) 2014年第5期31卷 589-594页

作者： LI Wan-di LIU Jun TANG Hong-yu XUE Hai-jun GAO Jing WANG Lu Key Laboratory of Textile Science and Technology Ministry of Education Donghua University Shanghai 201620 China Heilan Home Ltd. Jiangyin 214426 China

The present study involves the preparation of TiO2/SiO2 nanocrystals and their application in self-clcaning wool-polyester fabrics. The TiO2/SiO2 nanocrystals were successfully synthesized and deposited onto wool-polyester fabrics using the low-temperature sol-gel technique. The as-prepared nanoeomposites and the nanocomposites coated samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The XRD and SEM results showed that the single-phase anatase nanocrystallites were formed and loaded on the fabric surface successfully. The photocatalytic activities of TiO2 -coated and TiO2/SiO2-coated wool-polyester fabrics were measured by studying photodegradation of methylene blue dye. Comparison of the photocatalytic activity of the coated samples reveals superiority of TiO2/SiO2 modified sample with respect to that of pure TiO2 modified sample. Our observations indicate that by applying this technique to the fabrics, self-cleaning materials can be designed for practical application.

关键词： wool-polyester fabrics Ti02 / SiO2 sol-gel photocatalytic self-cleaning

Robust Polystyrene/Fluorinated Silica Superhydrophobic Composite Coatings with Rapid Curing at Room Temperature Prepared by One-Step Spraying

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Journal of Bionic Engineering 2023年第6期20卷 2742-2754页

作者： Yong Wang Lihua Yu Junhua Xu Kai Jing Ningxin Mao School of Materials Science and Engineering Jiangsu University of Science and Technology2 Mengxi RoadZhenjiang CityJiangsu ProvinceChina

Superhydrophobic materials are severely limited in their applications due to their weak mechanical properties and complex preparation process.In this paper,polystyrene/fluorinated silica(PS/SiO_(2))superhydrophobic composite coatings were prepared on the surface of 304 stainless steel using a simple one-step spraying method.The effects of different PS contents on the wettability as well as the wear properties of the samples were investigated.SiO_(2) was encapsulated in polystyrene to form a structure similar to cement encapsulated stones.With the addition of PS,a mound-like structure was formed on the sample surface,and a more optimized micro–nano structure was obtained when the content of PS was 0.6 g.At this time,the sample exhibited excellent wettability with a contact angle of 157.86°and a sliding angle of 0.84°.In addition,the contact angle of 151.09°was achieved after 180 cm of friction under a 100 g load and the composite coating prepared by this method also has excellent chemical stability,water impact resistance,corrosion resistance,and self-cleaning properties.This opens up new possibilities for the development of simple and robust superhydrophobic materials.

关键词： Superhydrophobic Room temperature curing Mechanical durability Corrosion resistance self-cleaning

Recent advances in preparation of metallic superhydrophobic surface by chemical etching and its applications

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Chinese Journal of Chemical Engineering 2023年第9期61卷 221-236页

作者： Shitong Zhu Wenyi Deng Yaxin Su College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

In the past few decades,inspired by the superhydrophobic surfaces(SHPS)of animals and plants such as lotus leaves,rose petals,legs of water striders,and wings of butterflies,preparing metal materials with metallic SHPS(MSHPS)have attracted great research interest,due to the great prospect in practical applications.To obtain SHPS on conventional metal materials,it is necessary to construct rough surface,followed by modification with low surface energy substances.In this paper,the action mechanism and the current research status of MSHPS were reviewed through the following aspects.Firstly,the model of wetting theory was presented,and then the progress in MSHPS preparation through chemical etching method was discussed.Secondly,the applications of MSHPS in self-cleaning,anti-icing,corrosion resistance,drag reduction,oil-water separation,and other aspects were introduced.Finally,the challenges encountered in the present application of MSHPS were summarized,and the future research interests were discussed.

关键词： Metal Superhydrophobic surface Chemical etching Low adhesion self-cleaning

A green and efficient strategy facilitates continuous solar-induced steam generation based on tea-assisted synthesis of gold nanoflowers

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Nano Research 2022年第7期15卷 6705-6712页

作者： Guoshuai Zhu Gaoxing Jing Guorong Xu Qiang Li Ruijia Huang Feng Li Haoxuan Li Dong Wang Wenwen Chen Ben Zhong Tang Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging School of Biomedical EngineeringShenzhen University Health Science CenterShenzhen 518055China Key Laboratory of Eco-Textiles(Ministry of Education) Nonwoven Technology LaboratoryJiangnan UniversityWuxi 214122China The Institute of Seawater Desalination and Multipurpose Utilization Ministry of Natural Resources(MNR)Tianjin 300192China Centre for AIE Research College of Material Science and EngineeringShenzhen UniversityShenzhen 518055China School of Science and Engineering Shenzhen Key Laboratory of Functional Aggregate MaterialsThe Chinese University of Hong KongShenzhen 518172China

Developing a highly efficient system for solar steam generation(SSG)using a straightforward and eco-friendly method to harvest freshwater is fascinating but challenging.Here,we stir the mixture of brewed tea and HAuCl4 to prepare Au nanoflowers,possessing broad wavelength light absorption and excellent photothermal effects.After freeze-drying the mixture of Au nanoflowers,cellulose nanocrystals(CNCs),and aqueous polyurethane(PU)emulsion,we obtain three-dimensional(3D)porous structures(CNC-PU-Au)for SSG.The whole process does not involve any sophisticated procedure or produce detrimental byproducts.The evaporation rates are 2.24 kg·m^(−2)·h^(−1) for pure water and 2.18 kg·m^(−2)·h^(−1) for seawater using CNC-PU-Au under one sun.The solar energy conversion efficiency is up to 90.92%under one sun illumination.Besides,CNC-PU-Au shows self-driven salt resistance and durability.In outdoors application for seawater desalination,the maximum evaporation rate can maintain at 2.19 kg·m^(−2)·h^(−1) in spring and 3.42 kg·m^(−2)·h^(−1) in summer.These unique features promise the utility of CNC-PU-Au in the ecofriendly water treatment industry.

关键词： Au nanoflowers solar steam generation eco-friendly self-cleaning seawater desalination

Preparation and Properties of Superhydrophobic ZnO Nanorod-based Nanocomposite on the Surface of Stainless Steel Mesh

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Journal of Bionic Engineering 2023年第3期20卷 910-922页

作者： Shunuo Bian Junhua Xu Lihua Yu Di Lu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

Bionic superhydrophobic coating has extremely broad application prospects and practical value. It is based on two important conditions, one is the construction of micro–nano structure, the other is the material with low surface energy. How to stabilize the micro–nano structure has become the focus of researches. In this work, a layer of Zn film is deposited on the stainless steel mesh with sturdy micron structure by RF magnetron sputtering. The solid micron structure of the stainless steel mesh itself, combined with the method of thermal oxidation, the surface of the stainless steel mesh is thus formed into a nanorod like ZnO nano structure, and then modified with perfluorodecyltriethoxysilane (PFDS) for low surface energy. The maximum contact angle of the superhydrophobic sample is 154.8°, and the minimum sliding angle is 2°, and it also has excellent corrosion resistance, thermal stability, self-cleaning, anti-aging and anti-icing properties, which provides a design idea for the preparation of superhydrophobic coatings.

关键词： Superhydrophobic Corrosion resistance self-cleaning Magnetron sputtering