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Quantitative analysis on resistant forces at oil-surfactant-rock interfaces with dynamic wettability characterization

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Energy Geoscience 2024年第3期5卷 305-312页

作者： Qiaoyu Ge Tao Ma Guanli Xu Zengmin Lun Science and Technology Experimental Research Center Petroleum Exploration and Production Research InstituteSINOPECBeijingChina

Adhesion of oil at rock surface plays an important role in the liberation of oil from micro-/nano-pores,especially for heavy oil that has extremely high *** molecular dynamics simulation is widely used to study the interfacial interaction for some specific oil-water-rock systems,experimental measurements provide more realistic and reliable *** this work,we propose a dynamic wettability characterization method to indirectly measure resistant forces at oil-surfactant-rock interfaces,including frictional force,wettability hysteresis force,and viscous force,which are parallel with the oil-solid *** adhesive force,which is normal to the oil-solid interface is calculated through measurement of work of *** results show that work of adhesion instead of contact angle can better describe the adhesion of oil at solid *** effect of surfactant concentration on work of adhesion is different for water-wet and oil-wet ***,average viscous forces are calculated through force analysis on oil drops moving along solid surface in different surfactant *** is found that viscous force has a magnitude comparable to the frictional force during the movement,while the wettability hysteresis force is *** the other hand,the adhesive force calculated from the work of adhesion is also comparable to the viscous ***,both the resistant forces parallel with and normal to the oil-solid interface should be minimized for the liberation of oil from rock *** work proposes a simple method to evaluate the wetting capability of different surfactants and measure the adhesive force between heavy oil and rock surfaces indirectly,which provides insight into the adhesion of heavy oil at rock surface and would be valuable for the development of surfactant-based oil recovery methods.

关键词： Work of adhesion Wettability characterization adhesive force Viscous force Surfactant

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Numerical Analysis of the adhesive forces in Nano-Scale Structure

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Journal of Bionic Engineering 2006年第4期3卷 209-216页

作者： Young-Sam Cho Houkseop Han Wan-Doo Kim Department of Future Technology Korea Institute of Machinery and Materials Daejeon 305-343 Republic of Korea

Nanohairs, which can be found on the epidermis of Tokay gecko＇s toes, contribute to the adhesion by means of van der Waals force, capillary force, etc. This structure has inspired many researchers to fabricate the attachable nano-scale structures. However, the efficiency of artificial nano-scale structures is not reliable sufficiently. Moreover, the mechanical parameters related to the nano-hair attachment are not yet revealed qualitatively. The mechanical parameters which have influence on the ability of adhesive nano-hairs were investigated through numerical simulation in which only van der Waals force was considered. For the numerical analysis, finite element method was utilized and van der Waals force, assumed as 12-6 Lennard-Jones potential, was implemented as the body force term in the finite element formulation.

关键词： numerical analysis adhesive force nano-scale structure finite element model van der Waals force 12-6 L-J potential

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A MODEL FOR COMPUTATIONAL INVESTIGATION OF ELASTO-PLASTIC NORMAL AND TANGENTIAL CONTACT CONSIDERING ADHESION EFFECT

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Acta Mechanica Sinica 2004年第2期20卷 165-171页

作者：李群仰余寿文 Key Lab.of Failure Mechanics MoEDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China

With the rapid development of Micro-Electro-Mechanical System(MEMS),we enter a field in which the surface effects have dominated many of the micro-scale phenomena,and the adhesive contact is one of the *** this paper,a feasible model for finite element computation is presented via a macroscopic and microscopic combination approach,in which the adhesive forces are simulated by some non-linear spring elements considering the softening *** basic problems concerning the adhesion effect were considered;through specific quantitative analysis,the results show a consistency with the current elastic continuum theories of adhesion and a brief investigation into the effects of adhesion on plastic deformation and tangential contact will be carried out as well.

关键词： adhesion adhesive force contact tangential contact

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Effect of surface roughness on the angular acceleration for a droplet on a super-hydrophobic surface

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Friction 2021年第5期9卷 1012-1024页

作者： Longyang LI Jingfang ZHU Zhixiang ZENG Eryong LIU Qunji XUE Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an 710054China

The motion of droplets on a super‐hydrophobic surface,whether by sliding or rolling,is a hot research *** affects the performance of super‐hydrophobic materials in many industrial *** this study,a super‐hydrophobic surface with a varied roughness is prepared by chemical‐*** adhesive force of the advancing and receding contact angles for a droplet on a super‐hydrophobic surface is *** adhesive force increases with a decreased contact angle,and the minimum value is 0.0169 mN when the contact angle is 151.47°.At the same time,the motion of a droplet on the superhydrophobic surface is investigated by using a high‐speed camera and fluid *** results show that the droplet rolls instead of sliding and the angular acceleration increases with an increased contact *** maximum value of the angular acceleration is 1,203.19 rad/s^(2) and this occurs when the contact angle is 151.47°.The relationship between the etching time,roughness,angular acceleration,and the adhesion force of the forward and backward contact angle are discussed.

关键词： super‐hydrophobic surface adhesive force rolling friction contact angle

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Morphology and Mechanical Characteristics of Monolayer and Multilayer Ir Coating by Double Glow Plasma

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 190-196页

作者：吴王平 JIANG Jinjin CHEN Zhaofeng JIANG Peng WANG Zhizhi School of Mechanical Engineering Changzhou University College of Material Science and Technology Nanjing University of Aeronautics and Astronautics

Multilayer iridium coating was manufactured on tungsten carbide substrates by a double glow plasma *** comparison,monolayer was also *** microstructure and morphology were observed using scanning electron *** orientation and phase were determined using X-ray *** residual stress of the coating was studied by glancing incidence X-ray *** adhesive force of the coating was measured by a scratch *** results showed that both monolayer and multilayer had a polycrystalline phase with a strong（110） *** coating had an excellent adhesion with no evidence of *** adhesive force of the monolayer and multilayer was about 50 and 43 N,*** interfacial reaction between the substrate and the layer occurred and a new WIr phase was found due to the high-temperature deposition *** residual stress in the monolayer and multilayer was-1.6 and-1.1 GPa,respectively.

关键词： morphology residual stress adhesive force monolayer multilayer iridium

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Internal limiting membrane dragging and peeling:a modified technique for macular holes closure surgery

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International Journal of Ophthalmology(English edition) 2020年第5期13卷 755-760页

作者： Jie Peng Li-Hua Zhang Chun-Li Chen Jing-Jing Liu Xiu-Yu Zhu Pei-Quan Zhao Department of Ophthalmology Xinhua HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200092China Department of Ophthalmology Binzhou Hubin Aier Eye HospitalBinzhou 256600Shandong ProvinceChina Department of Ophthalmology Eye Institute and School of OptometryTianjin Medical University Eye HospitalTianjin 200022China Department of Ophthalmology Shengli Oilfield Central HospitalDongying 257034Shandong ProvinceChina

AIM:To introduce a modified technique of internal limiting membrane(ILM)centripetal dragging and peeling to treat idiopathic macular hole(IMH)and to observe the ILM-retina adhesive ***:Twenty-six consecutive patients with stage 3 to 4 IMH and followed up at least six months were *** patients underwent complete par plana vitrectomy,ILM dragging and peeling,fluid and gas exchange,15%C3 F8 tamponade and 2-week prone *** best corrected visual acuity,macular hole evaluation by optical coherence tomography,and complications were ***:The mean diameter of IMH was 524±148μm(range:201-683μm),with 21 cases(80.8%)greater than 400μ*** dragging and peeling were successfully performed in all *** of the ILM-retina adhesive forces are severe(42.3%,11/26),followed by mild(38.5%,10/26),and moderate(19.2%,5/26).The mean follow-up duration was 21.2±6.1 *** IMH was closed in 25(96.3%)*** acuity(logMAR)improved significantly from 1.2±0.6 preoperatively to 0.7±0.5 postoperatively(Padhesive force is found in IMH *** assistance of this force,this modified technique may help to release the IMH edges and improve the closure rate of large IMH.

关键词： idiopathic macular hole internal limiting membrane adhesive force par plana vitrectomy

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NEW MECHANISM OF LIMITED-SLIP DIFFERENTIAL

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Chinese Journal of Mechanical Engineering 1994年第2期7卷 124-129页

作者： Zhang Shemin Luo Hongtian(Xi’an Jiaotong University)

According to property requirement of differential, create a new mechanism, which is a combination of a paralleogram linkage and a inverse parallelogram linkage,to replace conventional bevel gears of differential and point out that using the new mechanism the differential can meet the needs of the requirements of torque and speed of the two axle shafts. The instantaneous speed ratio (ISR) which is the left and right half-shaft with respect to differential shell is variable. The calculating result of the locking factor of the new mechanism is up to 3. The limited-slip capability increase twice. The mechanism is an ideal new type of mechanism of differential.

关键词： Limited-slip differentials adhesive force Linkages Mechanism

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Preparation and the anti-corrosion of nano-SiO2 composite coating

Preparation and the anti-corrosion of nano-SiO2 composite co...

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2009年全国电子电镀及表面处理学术交流会

作者： Suwei YAO~*,Xiaoyan WANG,Yan XU,Weiguo ZHANG,Hongzhi WANG (SUGIYAMA laboratory of surface technology,School of Chemical Engineering,Tianjin University,Tianjin,300072)

Hydrophobic nano-SiO particles were prepared by surface modification,and the diameter of nano-SiO particle was about 50nm. Using stiring and ultrasonic dispersing,nano-SiO composite coating was obtained by adding modified nano-SiO into alkyd *** experiment, anodic polarization and electrochemical impedance were applied to evaluate the anti-corrosion of coatings,and the results showed that the anticorrosion of coatings was improved by adding modified *** addition,the adhesive force of coating film increased by adding modified nano-SiO by peel and shear *** the influence of content of nano-SiO on the performance of nano-SiO composite coating was *** this paper,the relationship between the adhesive force and the anti-corrosion of coating was studied by comparing the anti-corrosion of coating films with and without adhesive *** was obtained that the larger the adhesive force was,the stronger the anti-corrosion was.

关键词： nano-SiO2 alkyd varnish anti-corrosion adhesive force

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INTERACTION forceS BETWEEN HYDROPHILIC SURFACES IN ELECTROLYTE DMSO SOLUTION MEASURED BY AFM

INTERACTION FORCES BETWEEN HYDROPHILIC SURFACES IN ELECTROLY...

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第二届中日化工学术研讨会

作者： Yoichi KANDA Ko HIGASHITANI Department of Chemical Engineering Kyoto University Kyoto 606-8501 Japan

The experimental measurements of the forces acting on silica-mica surfaces immersed in lithium chloride DMSO solutions were performed using an atom force microscopy (AFM) . Various force curves were obtained by changing the ionic concentration, the radius of curvature of surfaces and approaching velocity of two surfaces. It is found that there exist two kinds of structured layers on the surface;the thin but firm primary layer composed of DMSO molecules, ions and solvated ions adsorbed on the surface, and the thick but fragile secondary layer outside the primary layer.

关键词： AFM DMSO adhesive force Structured layer

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