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Biomimetic Hydrophobic Surfaces with low or High adhesion Based on Poly（vinyl alcohol） and SiO2 Nanoparticles

Journal of Bionic Engineering 2017年第3期14卷 476-485页

作者： Qian Wang Zhao Dong Xiaoxia Yan Yanjiao Chang Lili Ren Jiang Zhou Key Laboratory of Bionic Engineering (Ministry of Education China) College of Biological and Agricultural Engineering Jilin University Changchun 130022 China College of Chemistry Jilin University Changchun 130022 China

Superhydrophobic surfaces are often found in nature, such as plant leaves and insect wings. Inspired by superhydrophobic phenomenon of the rose petals and the lotus leaves, biomimetic hydrophnbic surfaces with high or low adhesion were prepared with a facile drop-coating approach in this paper. Poly（vinyl alcohol）（PVA） was used as adhesive and SiO2 nanoparticles were used to fabricate surface micro-structure. Stearic acid or dodecafluoroheptyl-propyl-trimethoxysilane （DFTMS） were used as low surface energy materials to modify the prepared PVA/SiO2 coating surfaces. The effects of size of SiO2 nanoparticles, concentration of SiO2 nanoparticle suspensions and the modifications on the wettability of the surface were investigated. The morphology of the PVA/SiO2 coating surfaces was observed by using scanning electron microscope. Water contact angle of the obtained superhydrophilic surface could reach to 3°. Stearic acid modified PVA/SiO2 coating surfaces showed hydrophobicity with high adhesion. By mixing the SiO2 nanoparticles with sizes of 40 nm and 200 nm and modifying with DFTMS, water contact angle of the obtained coating surface could be up to 155° and slide angle was only 5°. This work provides a facile and useful method to control surface wettability through changing the roughness and chemical composition of a surface.

关键词： biomimetic surface PVA/SiO2 coating hydrophobicity high adhesion low adhesion

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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

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Preparation of a biomimetic superomniphobic hierarchical structure and analysis of droplet wettability

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Biosurface and Biotribology 2022年第2期8卷 129-139页

作者： Jing Li Qunxiang Feng Nan Guo Fei Wang Xin Du Feng Du College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchunChina School of Opto-Electronic Engineering Changchun University of Science and TechnologyChangchunChina Non-Commissioned Officer School of Army Academy of Armored Forces Changchun Economic and Technological Development Zone of Jilin ProvinceChangchunChina

In this study,a bioinspired hierarchical structure was formed with superomniphobicity on a 7075 aluminium alloy using laser ablation.The morphology and wetting characteristics of the biomimetic sample surface were characterised using scanning electron microscopy,laser confocal microscopy,and contact angle measurements.The effect of the liquid properties and surface structures on the rolling behaviour was investigated.The results suggest that the fabricated biomimetic sample surface was a hierarchical structure.The prepared sample had superomniphobicity and low adhesion properties,and the contact angles of six different liquid droplets on the sample surface reached or approached 150°.Specifically,the largest contact angle was 152°,and the average rolling angle was 7.7°.This multi-hydrophobic surface provides a valuable reference for the research study and use of a variety of solid–liquid contacts.

关键词： bioinspiration hierarchical structures low adhesion superomniphobicity

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Salvinia-like slippery surface with stable and mobile water/air contact line

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National Science Review 2021年第5期8卷 119-129页

作者： Xiaomei Li Jinlong Yang Kaixuan Lv Periklis Papadopoulos Jing Sun Dehui Wang Yanhua Zhao Longquan Chen Dapeng Wang Zuankai Wang Xu Deng Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China State Key Laboratory of Polymer Physics and Chemistry Institute of Applied ChemistryChinese Academy of Sciences Physics Department University of Ioannina University Research Center of Ioannina (URCI) Institute of Materials Science and Computing Department of Mechanical Engineering City University of Hong Kong School of Physics University of Electronic Science and Technology of China

Superhydrophobic surfaces are widely used in many industrial settings, and mainly consist of rough solid protrusions that entrap air to minimize the liquid/solid area. The stability of the superhydrophobic state favors relatively small spacing between protrusions. However, this in turn increases the lateral adhesion force that retards the mobility of drops. Here we propose a novel approach that optimizes both properties simultaneously. Inspired by the hydrophobic leaves of Salvinia molesta and the slippery Nepenthes pitcher plants, we designed a Salvinia-like slippery surface(SSS) consisting of protrusions with slippery heads. We demonstrate that compared to a control surface, the SSS exhibits increased stability against pressure and impact, and enhanced lateral mobility of water drops as well as reduced hydrodynamic drag. We also systematically investigate the wetting dynamics on the SSS. With its easy fabrication and enhanced performance, we envision that SSS will be useful in a variety of fields in industry.

关键词： slippery Cassie state Salvinia molesta stability low adhesion drag reduction

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