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Frontiers of Structural and Civil Engineering 2024年第1期18卷 66-79页

作者： Yaxin TAO Xiaodi DAI Geert de SCHUTTER Kim Van TITTELBOOM Department of Structural Engineering and Building Materials Ghent UniversityGhent 9052Belgium

Robotic-based technologies such as automated spraying or extrusion-based 3-dimensional(3D)concrete printing can be used to build tunnel linings,aiming at reducing labor and mitigating the associated safety issues,especially in the high-geothermal environment.Extrusion-based 3D concrete printing(3DCP)has additional advantages over automated sprayings,such as improved surface quality and no rebound.However,the effect of different temperatures on the adhesion performance of 3D-printed materials for tunnel linings has not been investigated.This study developed several alkali-activated slag mixtures with different activator modulus ratios to avoid the excessive use of Portland cement and enhance sustainability of 3D printable materials.The thermal responses of the mixtures at different temperatures of 20 and 40℃ were studied.The adhesion strength of the alkali-activated material was evaluated for both early and later ages.Furthermore,the structural evolution of the material exposed to different temperatures was measured.This was followed by microstructure characterization.Results indicate that elevated temperatures accelerate material reactions,resulting in improved early-age adhesion performance.Moreover,higher temperatures contribute to the development of a denser microstructure and enhanced mechanical strength in the hardened stage,particularly in mixtures with higher silicate content.

关键词： alkali-activated material 3DCP tunnel lining high-geothermal environment adhesion

adhesion at friction and wear

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Friction 2022年第11期10卷 1859-1878页

作者： Dmitry P.MARKOV Research Institute of Railway Transport Moscow 129851Russia

Our understanding of the surrounding world,from friction to the origin of life,depends on how we imagine the contact interaction of condensed bodies.What are the forces acting in contact with solids?Do they attract(adhesive)or repel(dehesive)?Theory and research at the atomic–molecular level have shown that the force are adhesive,but everyday experiences cast doubt on this conclusion.This article addresses this issue by considering the mistakes made in experimental and theoretical tribology and surface physics.Taking into account the theories of hybridization and dehybridization of electron orbitals and valence bonds,the views on the structure of the surfaces of condensed bodies and the force arising during contact interaction are revised.The influence of van der Waals,hydrogen,covalent,metallic,and ionic bonds on the properties of lubricants is evaluated.The contours of the dehesive–deformation theory of friction and wear are also outlined.

关键词： atomic and molecular interactions adhesion cohesion dehesion friction wear

adhesion and corrosion resistance of polycaprolactone coating on NiTi alloy surface after alkali heat pretreatment

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Biosurface and Biotribology 2022年第4期8卷 307-314页

作者： Zhihui Zhang Yanan Yang Yunting Guo Pengwei Sha Zezhou Xu Zhenglei Yu Jiashun Si Zhengao Zhang Jia Guo Yifan Chen Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchunChina Weihai Institute for Bionic Jilin UniversityWeihaiChina State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchunChina Beijing Reserarch Institute of Automation for Machinery Industry Co. LtdBeijingChina Key Laboratory of Automobile Materials Ministry of EducationCollege of Materials Science and EngineeringJilin UniversityChangchunChina

Selective laser melting of nickel-titanium alloy(SLM-NiTi)can precisely control the size of the sample molding structure and has attracted extensive attention due to its special superelasticity and shape memory effect.However,the biological inertness and poor corrosion resistance of SLM-NiTi alloy limit their wide application as biomedical implant materials.In this study,polycaprolactone(PCL)coating was prepared on SLM-NiTi alloy by dipping and pulling method,and the effects of alkali heat pretreatment on the morphology,adhesion,corrosion resistance,long-term stability and biomineralisation of the PCL coatings were investigated.The results showed that PCL coating can substan-tially improve the performance of SLM-NiTi alloy,and the PCL coating after alkali heat pretreatment has higher adhesion(increased from 1,747 to 2,498 mN)and lower corrosion current density(reduced by about an order of magnitude compared to PCL coating alone).In addition,the necessary stability,biomineralisation and biocompatibility ability of coatings were also further improved.Therefore,the alkali heat pretreated PCL-coated SLM-NiTi alloy has good application prospects in implants due to its superior properties.

关键词： adhesion alkali heat pretreatment corrosion resistance PCL coating SLM-NiTi alloy

adhesion and friction performance of DLC/rubber:The influence of plasma pretreatment

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Friction 2021年第3期9卷 627-641页

作者： Changning BAI Zhenbin GONG Lulu AN Li QIANG Junyan ZHANG Georgy YUSHKOV Alexey NIKOLAEV Maxim SHANDRIKOV Bin ZHANG Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China High Current Electronics Institute Russian Academy of SciencesTomsk 634055Russia

Diamond-like carbon(DLC)films are deposited on rubber surfaces to protect the rubber components,and surface pretreatment of the rubber substrates prior to the film deposition can improve the adhesion between the DLC films and the rubber.Thus,the principal purpose of this work concentrates on determining the effects of argon(Ar),oxygen(O_(2)),nitrogen(N_(2)),and hydrogen(H_(2))plasma pretreatments on the adhesion and friction performance of the DLC films deposited on rubber(DLC/rubber).The results indicated that the Ar plasma pretreatment promoted the formation of a compact layer on the rubber surface.By contrast,massive fillers were exposed on the rubber surface after oxygen or nitrogen plasma pretreatments.Moreover,the typical micrometer-scale patches divided by random cracks were observed on the surface of DLC/rubber,except for the sample pretreated with oxygen plasma.The adhesion of DLC/rubber was found to strengthen with the removal of weak boundary layers and the generation of free radicals on the rubber surface after plasma pretreatment.The tribo-tests revealed that DLC/rubber with O_(2),N_(2),and H_(2) plasma pretreatments cannot achieve optimal friction performance.Significantly,DLC/rubber with Ar plasma pretreatment exhibited a low and stable friction coefficient of 0.19 and superior wear resistance,which was correlated to the high adhesion,good load-bearing of the rubber surface,and the approximate sine function of the surface profile of the DLC film.

关键词： diamond-like carbon(DLC)films rubber plasma pretreatment adhesion friction

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超耐用疏冰涂层的制备及性能研究

Science China Materials 2023年第5期66卷 2071-2078页

作者：卓毅智 Verner Håkonsen 刘思琪李彤王锋罗四海肖森波何健英张志良 Nanomechanical Lab Department of Structural EngineeringNorwegian University of Science and Technology(NTNU)Trondheim 7491Norway NanoLab Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Department of Chemistry Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

被动疏冰涂层作为一种新形防除冰方法,拥有环境友好、耗能低、经济等优势,因此在过去十几年来被广泛研究.但是,目前的主动疏冰涂层仍存在疏冰性与耐久性难以兼容的问题.本文设计了一种兼具高韧性、强基底粘附力和自愈合能力的透明疏冰涂... 详细信息

被动疏冰涂层作为一种新形防除冰方法,拥有环境友好、耗能低、经济等优势,因此在过去十几年来被广泛研究.但是,目前的主动疏冰涂层仍存在疏冰性与耐久性难以兼容的问题.本文设计了一种兼具高韧性、强基底粘附力和自愈合能力的透明疏冰涂层.涂层具有疏水性、光滑表面及低模量,保障了涂层的低冰粘附强度.通过引入类海绵结构,冰粘附强度可降低至26.7±1.1 kPa.涂层高分子网络的多重氢键赋予其高韧性、强基底粘附力和自愈合能力.因此,涂层在35次结冰/除冰循环和600次机械磨损之后能避免涂层剥离并保持疏冰性,且能愈合机械磨损恢复其疏冰性.另外,涂层在海水及近北极气候暴露8个月后仍能保持良好的疏冰性.该工作为耐久性疏冰涂层的设计提供了一种新思路.

关键词： robust icephobic adhesion toughness self-healing

Contact Electrification and adhesion Between Carbon Nanotube and Graphene on Metal Surfaces: Insights from First-principles Study

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Journal of Bionic Engineering 2022年第1期19卷 103-112页

作者： Jing Tao Linfeng Wang Jin Li Zhendong Dai Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

The effect of contact electrification on adhesion has been debated in recent years for gecko and bio-inspired dry adhesion material.To understand the fundamentals of this issue for Carbon Nanotube(CNT)dry adhesives,contact electrification and its relationship with adhesion are systematically studied using the first-principles calculation.Charge transfers from CNT or its special form,graphene,to the metal surface during the contact,and the transferred charge linearly correlates with the work function difference.Meanwhile,the adhesion energy is linearly related to the transferred charge for both CNT and graphene.More charge transfers from the flat graphene to metal surfaces than the curved CNT,leading to higher adhesion between graphene and metal surfaces.The curved structure of the CNT causes an irregular change of charge at the interface and hinders the charge transfer.Moreover,the curved structure induces electronic localization,which also decreases the interfacial charge transfer.The structure affects contact electrification,and hence adhesion is further demonstrated by the CNT with different deformation when contacting different surfaces.This study advances our understanding of contact electrification and its relationship with adhesion at the interface for bio-inspired carbon adhesive materials and sheds light on the control of them for engineering applications.

关键词： Contact electrification adhesion Bio-inspired adhesive CNT First-principles calculation Interfacial interaction

High-adhesion anionic copolymer as solid-state electrolyte for dendrite-free Zn-ion battery

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Nano Research 2022年第8期15卷 7190-7198页

作者： Jiaxu Li Junfeng Ren Caixia Li Pengxian Li Tingting Wu Shiwei Liu Lei Wang State Key Laboratory Base of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyQingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China

To conquer severe dendrites formation and side reactions of zinc metal anodes,which are serious obstacles for the practical applications of aqueous zinc ion battery(ZIB),herein,we develop a sodium allysulfonate(SAS)and acrylamide(AM)copolymer by radical polymerization process(crosslinking of C=C)as solid-state electrolyte.The interface kinetics is improved remarkably due to the high adhesion and excellent ion transferability of AM-SAS(AS)copolymers.Especially the sulfonic acid group in the hydrogel electrolyte can enhance the internal ionic conductivity effectively benefiting from its high affinity to Zn^(2+).Also,polymer chains realize re-regulation to Zn^(2+)flow in atomic-scale,thus leading to controllable deposition of Zn onto the dendrite-free Zn anodes.Consequently,the AS-1.5 electrolyte achieves ultra-stable Zn deposition/stripping behaviors with the lifespan over 1,000 h via the suppression of side-reactions and paralleled Zn deposition.High performances of Zn/Mn-doped V_(2)O_(5)(MnVO)(over 500 cycles)and Zn/diquinoxalino[2,3-a:2',3'-c]phenazine(HATN)(over 2,500 cycles)full cells demonstrate that the AS hydrogel electrolyte is a common approach for ZIBs under various conditions.This molecular regulation engineering opens a novel route for hydrogel electrolyte fabrication,where sulfonic groups perform as media of Zn^(2+)transfer.Therefore,high bulk ionic conductivity as well as excellent interface ion diffusion ability is obtained.

关键词： copolymer adhesion ionic conductivity dendrite-free interface kinetics

A Bioinspired Adhesive Sucker with Both Suction and adhesion Mechanisms for Three-Dimensional Surfaces

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Journal of Bionic Engineering 2022年第6期19卷 1671-1683页

作者： Jing Li Zhenzhen Song Chuandong Ma Tonghang Sui Peng Yi Jianlin Liu College of Mechanical and Electrical Engineering China University of Petroleum(East China)Qingdao266580China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao266580China

There are significant advantages to investigate underwater attachments,which would be valuable in providing inspirations and design strategies for multi-functional surfaces and underwater robots.Here,an abalone-inspired sucker integrating an elastic body and a membrane structure is proposed and fabricated filled with rigid quartz particles to adjust the backing stiffness of the contact like abalone.The membrane is used to conform and contact surfaces well,the center area of which can be pulled in exposed to a negative pressure differential,to create a suction cavity.The pulling experiments indicate that the sucker can adhere to three-dimensional surfaces with both suction and adhesion mechanisms in both dry and liquid environments.The switching between soft/hard contact states leads to the change of adhesive strength over 30 times.Furthermore,we provide theoretical analysis on how the sucker work well in both dry and liquid environments.Finally,the developed sucker can easily lift up smooth planar objects and 3D objects,and can grip objects both smaller and larger than the size of the sucker,which have a difficulty for conventional suckers or friction-based grippers.The potential application of the sucker in flexible transfer robot is demonstrated on various surfaces and environments,paving the way for further bio-inspired adhesive designs for both dry and wet scenarios.

关键词： adhesion Sucker Abalone Suction Jamming Bioinspired

Effect of spatial configuration on adhesion of 1,2-disubstituted cyclohexane derivatives

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中国化学快报:英文版 2023年第8期34卷 196-200页

作者： Qiao Zhang Yuhang Yin Jingfu Song Gai Zhao Shengyi Dong College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Spatial configuration has a significant effect on chemical self-assembly.However,the importance of spatial configuration in supramolecular adhesive materials has been frequently ignored.In this study,the effects of the spatial configuration on cohesion and adhesion were investigated.Owing to the diversities of the chemical structures and assembly patterns,1,2-disubstituted cyclohexane derivatives were used in this combined experimental and theoretical investigation.The self-sorting assembly of enantiopure isomers improved cohesion but had a negative effect on adhesion.In contrast,racemic mixtures displayed stronger adhesion effects.Moreover,it was proven that the cis-configuration was more favorable for supramolecular adhesion than the trans-counterpart.In addition,the influence of the spatial configuration of 1,2-disubstituted cyclohexane derivatives could be effectively mitigated by hydrogen bond donors or acceptors.The addition of natural acids yielded three-dimensional polymeric networks,in which the spatial configuration was not the decisive factor for supramolecular adhesion.

关键词： Spatial configuration Supramolecular adhesive material Assembly Cohesion adhesion

Insight into Atomic-Scale adhesion at the C-Cu Interface During theInitial Stage of Nanoindentation

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Nanomanufacturing and Metrology 2022年第3期5卷 250-258页

作者： Jian Gao Xichun Luo Wenlong Chang Zhengjian Wang Yongda Yan Yanquan Geng Centrefor Precision Manufacturing DMEMUniversity of StrathclydeGlasgowUK Center for Precision Engineering Harbin Institute of TechnologyHarbinPeople's Republic of China

adhesion is a common phenomenon in nanomachining which affects processing accuracy and repeatability.As material removal approaches the atomic or close-to-atomic scale,quantum mechanics becomes the dominant principle behind the atomic-level interaction.However,atomic-scale effects cannot be properly described by empirical potential function-based molecular dynamics simulations.This study uses a first-principles method to reveal the atomic-scale adhesion between a diamond tip and a copper slab during initial-stage nanoindentation.Using a simplified tip and slab model,adhesion energy,electronic distribution,and density of states are analyzed based on quantum chemistry calculation.Results show that atomic adhesion is primarily due to the covalent bonding interaction between C and Cu atoms,which can induce structural changes to the diamond tip and copper slab.The effects of tip position and angles on adhesion are further studied through a series of simulations.The results show that adhesion between the tip and slab is sensitive to the lattice structure and a variant in angstroms is enough to cause different adhesion and structural changes.The actual determinants of adhesion can only be the atomic and electronic structures at the tip-slab interface.Bond rotation and breakage are observed during simulation and their effects on adhesion are further discussed.To conclude,the first-principles method is important for the analysis of an atomic-scale interaction system,even if only as an aid to describing adhesion at atomic and electronic scales.

关键词： Nanoindentation adhesion Diamond Copper First-principles Density functional theory