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contact angle Prediction Model for Underwater Oleophobic Surfaces Based on Multifractal Theory

中国炼油与石油化工:英文版 2023年第3期25卷 37-48页

作者： Jiang Huayi You Yanzhen Hu Juan Tian Dongmei Qi Hongyuan Sun Nana Liu Mei College of Petroleum Engineering Xi’an Shiyou UniversityXi’an 710065ShaanxiChina Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs Xi’an Shiyou UniversityXi’an 710065ShaanxiChina The Second Gas Production Plant Changqing Oilfield CompanyYulin 719000ShaanxiChina

Traditional microstructure scale parameters have difficulty describing the structure and distribution of a roughmaterial’s surface morphology comprehensively and quantitatively. This study constructs hydrophilic and underwateroleophobic surfaces based on polyvinylidene fluoride (PVDF) using a chemical modification method, and the fractaldimension and multifractal spectrum are used to quantitatively characterize the microscopic morphology. A new contactangle prediction model for underwater oleophobic surfaces is established. The results show that the fractal dimension ofthe PVDF surface first increases and then decreases with the reaction time. The uniformity characterized by the multifractalspectrum was generally consistent with scanning electron microscope observations. The contact angle of water droplets onthe PVDF surface is negatively correlated with the fractal dimension, and oil droplets in water are positively correlated.When the fractal dimension is 2.0975, the new contact angle prediction model has higher prediction accuracy. Themaximum and minimum relative deviations of the contact angle between the theoretical and measured data are 18.20%and 0.72%, respectively. For water ring transportation, the larger the fractal dimension and spectral width of the materialsurface, the smaller the absolute value of the spectral difference, the stronger the hydrophilic and oleophobic properties, andthe better the water ring transportation stability.

关键词： contact angle hydrophilic-oleophobic surface polyvinylidene fluoride multifractal prediction model

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A Simple Method to Measure the contact angle of Metal Droplets on Graphite

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Nanomanufacturing and Metrology 2023年第4期6卷 35-45页

作者： Bozhao Wu Yongping Kang Cai Lu Langquan Shui Wengen Ouyang Qi Peng Qiankun He Ze Liu Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072HubeiChina School of Civil Engineering Architecture and Environment Hubei University of TechnologyWuhan 430068HubeiChina System Design Institute of Hubei Areospace Technology Academy Wuhan 430040China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

The determination of solid–liquid interfacial tension plays an important role in science and technology.Here,we propose a simple method to directly measure the contact angle between metal droplets and a graphite substrate for the determination of metal–graphite interfacial tension.The proposed method involves the synthesis of micro-and nanosized metal droplets on graphite by arc melting.Owing to its small volume,the rapid cooling of the prepared metal droplets on the graphite substrate leads to the freezing of equilibrium contact confguration after solidifcation.We observe that the measured contact angle between micro-and nanosized Au(or Ag)particles and the graphite substrate is almost size independent,even though the size of the particles synthesized herein is 1–3 orders of magnitude smaller than that studied in previous works.In addition,the interfacial tensions of Au and Ag on the step edges(edge plane)of graphite are found to be larger than that on the(0001)plane(basal plane).The proposed method provides a simple approach to determine the solid–liquid interfacial tension and may be efective in the study of interface related science and technology.

关键词： Metal droplets Graphite/graphenes contact angle Interfacial tension

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contact angle Determination in Multicomponent Lattice Boltzmann Simulations

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Communications in Computational Physics 2011年第5期9卷 1165-1178页

作者： Sebastian Schmieschek Jens Harting Institute for Computational Physics University of StuttgartPfaffenwaldring 2770569 StuttgartGermany Department of Applied Physics Eindhoven University of TechnologyP.O.Box 5135600 MB EindhovenThe Netherlands

Droplets on hydrophobic surfaces are ubiquitous in microfluidic applications and there exists a number of commonly used multicomponent and multiphase lattice Boltzmann schemes to study such systems.In this paper we focus on a popular implementation of a multicomponent model as introduced by Shan and Chen.Here,interactions between different components are implemented as repulsive forces whose strength is determined by model parameters.In this paper we present simulations of a droplet on a hydrophobic surface.We investigate the dependence of the contact angle on the simulation parameters and quantitatively compare different approaches to determine it.Results show that the method is capable of modelling the whole range of contact angles.We find that the a priori determination of the contact angle is depending on the simulation parameters with an uncertainty of 10%to 20%.

关键词： Lattice Boltzmann Shan-Chen model contact angle droplets hydrophobic surface

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Mechanism of contact angle saturation and an energy-based model for electrowetting

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Chinese Physics B 2016年第6期25卷 360-365页

作者：赵瑞梁忠诚 College of Optoelectronic Engineering Center of Optofluidic TechnologyNanjing University of Posts and Telecommunications

Electrowetting,as a well-known approach to increasing droplet wettability on a solid surface by electrical bias,has broad applications.However,it is limited by contact angle saturation at large voltage.Although several debated hypotheses have been proposed to describe it,the physical origin of contact angle saturation still remains obscure.In this work,the physical factors responsible for the onset of contact angle saturation are explored,and the correlated theoretical models are established to characterize electrowetting behavior.Combination of the proper 3-phase system employed succeeds in dropping the saturating contact angle below 25？,and validates that the contact angle saturation is not a result of devicerelated imperfection.

关键词： electrowetting contact angle saturation

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NUMERICAL STUDY OF THE RELATIONSHIP BETWEEN APPARENT SLIP LENGTH AND contact angle BY LATTICE BOLTZMANN METHOD

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Journal of Hydrodynamics 2012年第4期24卷 535-540页

作者： ZHANG Ren-liang DI Qin-feng WANG Xin-liang DING Wei-peng GONG Wei Shanghai Institute of Applied Mathematics and Mechanics and Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200072China

The apparent slip between solid wall and liquid is studied by using the Lattice Boltzmann Method （LBM） and the Shan-Chen multiphase model in this paper. With a no-slip bounce-back scheme applied to the interface, flow regimes under different wall wettabilities are investigated. Because of the wall wettability, liquid apparent slip is observed. Slip lengths for different wall wettabilities are found to collapse nearly onto a single curve as a function of the static contact angle, and thereby a relationship between apparent slip length and contact angle is suggested. Our results also show that the wall wettability leads to the formation of a low-density layer between solid wall and liquid, which produced apparent slip in the micro-scale.

关键词： Lattice Boltzmann Method （LBM） wettability apparent slip contact angle nano-particles adsorbing method

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A new model for the formation of contact angle and contact angle hysteresis

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Chinese Physics B 2010年第10期19卷 390-395页

作者：公茂刚刘远越许小亮 Department of Physics University of Science and Technology of China

The formation mechanism of the contact angle and the sliding angle for a liquid drop on a solid surface plays an important role in producing hydrophobic surfaces. A new half soakage model is established in this paper as a substitute for Wenzel （complete soakage） and Cassie （no soakage） models. The model is suited to many solid surfaces, whether they are hydrophilic or hydrophobic, or even superhydrophobic. Based on the half soakage model, we analyse two surfaces resembling lotus, i.e. taper-like surface and corona-like surface. Furthermore, this new model is used to establish a quantitative relationship between the sliding angle and the parameters of surface morphology.

关键词： contact angle half soakage model contact angle hysteresis

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Surface Characterization of Helium Plasma Treated Nano-SiO2 Sol-gel Coating UHMWPE Filaments by contact angle Experiments and ATR-FTIR

Surface Characterization of Helium Plasma Treated Nano-SiO2 ...

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绿色纺织，健康生活——第三届纺织生物工程及信息学国际会...

作者： Ying-Chen Zhang1 2 Jian-Xin He1 Hong-Yan Wu1 Yi-Ping Qiu2 1Zhongyuan University of Technology Zhengzhou 450007 China 2Engineering Research Center of Textile Technical Education Ministry Donghua University Shanghai 201620 China

Ultrahigh molecular weight polyethylene （UHMWPE） Filaments has a low surface free energy and therefore a modification of their surface properties before any use is often needed. Atmospheric pressure plasmas treatment is a convenient and environment friendly way to obtain these modifications by introducing new chemical groups at the surface without affecting the bulk properties. This paper studies the influence of nano-SiO2 Sol-gel coating pretreatment on atmospheric pressure jet （APPJ） treatment of UHMWPE fibers with helium used as the treatment gas. The surface properties of the plasma-treated UHMWPE Filaments are characterized using contact angle measurements and ATR-FTIR spectroscopy. The UHMWPE Filaments show a remarkable increase in surface free energy after plasma treatment. ATR-FTIR spectroscopy of the plasma-treated UHMWPE Filaments reveals that plasma treatment introduces oxygen-containing functionalities, such as ketones, aldehydes, alcohols and carboxylic acids on the UHMWPE Filaments surface leading to the increased surface free energy.

关键词： plasma jets UHMWPE contact angle fourier transform infrared spectroscopy

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Wetting behavior of CaO-Al_(2)O_(3)-based mold flux with various BaO and MgO contents on the steel substrate

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1179-1185页

作者： Lejun Zhou Hao Luo Wanlin Wang Houfa Wu Erzhuo Gao You Zhou Daoyuan Huang School of Metallurgy and Environment Central South UniversityChangsha 410083China National Center for International Cooperation of Clean Metallurgy Changsha 410083China

The Interfacial phenomena in mold have a great impact on the smooth operation of continuous casting process and the quality of the casting product.In this paper,the wetting behavior of CaO-Al_(2)O_(3)-based mold flux with different BaO and MgO contents was studied.The results showed that the contact angle between molten flux and interstitial free(IF)steel substrate increased from 62.4°to 74.5°with the increase of BaO content from 3 wt%to 7 wt%,while it decreased from 62.4°to 51.3°with the increase of MgO content from 3 wt%to 7 wt%.The interfacial tension also increased from 1630.3 to 1740.8 mN/m when the BaO content increased,but it reduced from 1630.3 to 1539.7 mN/m with the addition of MgO.The changes of contact angle and interfacial tension were mainly due to the fact that the bridging oxygen(O^(0)) at the interface was broken into non-bridging oxygen(O^(-)) and free oxygen(O_(2-)) by MgO.However,more O^(-) and O_(2-) connected into O^(0) when BaO was added,since the charge compensation effect of BaO was so stronger that it offset the effect of providing O_(2-).

关键词： mold flux wetting contact angle interfacial tension melt structure continuous casting

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High-performance martensitic stainless steel nanocomposite powder for direct energy deposition prepared by ball milling

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Rare Metals 2023年第7期42卷 2419-2432页

作者： Zhen Wang Shu-Rong Xu Qing-Xuan Sui Jiang Wang Bo Liu Hao Wen Tian-Yi Xiao Quan Yuan Feng-Jun Zhao Jun Liu School of Materials Science and Engineering Central South UniversityChangsha410083China Jinchuan Nickel Cobalt Research and Design Institute Jinchuan Group Co.LtdJinchang737100China

Direct energy deposition(DED)has great potential for the production of stainless steel matrix nanocomposite parts.However,the propensity of nanoparticle agglomeration leads to the difficulty in realizing homogenous dispersion of nanoparticles in the matrix.In this study,a series of agglomeration-free nanoWC-Co-reinforced 420 stainless steel matrix nanocomposite powders with high flowability were prepared by ball milling under the optimal parameters.The effect of ball milling time on the properties of the composite powders was investigated.Excellent powder properties ensure the DED processing performance.Furthermore,the corresponding composites were fabricated by DED,and the effects of nano-WC-Co content on the properties of the composites were comprehensively investigated.The contact angles between the single pass cladding layer and the substrate change with increasing nano-WC-Co content(decrease from 127.38°to 113.07°).The different contact angles will significantly influence the quality of the multipass cladding layer.Furthermore,the addition of nanoWC-Co leads not only to further grain refinement but also to more pronounced isotropy of the micros tructure.With the increase in nano-WC-Co content,the corrosion resistance is significantly improved(62.28%lower corrosion current for 420-15 wt%nano-WC-Co than for 420).

关键词： Steel matrix composites Direct energy deposition(DED) Ball milling time contact angle Microstructure Mechanical property

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Study on Surface Wettability of Bamboo by Measurement of contact angle

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Chinese Forestry Science and Technology 2002年第1期1卷 5-15页

作者： JIANG Zehui YU Wenji FEI BenhuaChinese Academy of Forestry. Beijing 100091. China

The main objective of this research is to evaluate the wettability of the processed bamboo surfaces. The important surface energy and acid-base properties for processed bamboo have been estimated by using contact angle techniques. According to the results, the change of ages has a positive relation with the contact angles of water on processed bamboo. The contact angles were increased after the bamboo surface treated in high temperature condition and preservation. The different treat methods have a stro...

关键词： Bamboo contact angle Wettability Surface

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