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Photo-induced grease/oil switched lubricant for friction regulation

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Friction 2024年第8期12卷 1696-1706页

作者： Zheng ZHANG Shuangxi TANG Liran MA Yu TIAN State key laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Controllable friction regulation has drawn much interest in both scientific and industrial *** there have been many researches on friction regulation by many physical fields and chemical ***-sensitive materials are promising because it is relatively easy to change their properties compared with ***,a new kind of photo-induced grease/oil switched lubricant is designed and shows great reversibility under ultraviolet(UV)and visible(Vis)*** viscosity can change more than 50 times under different irradiation,and the coefficients of friction(COFs)obviously increase under Vis irradiation and decrease under UV irradiation,which performs better than those of the common *** to the experimental results,the phenomena are contributed to the break and reconstruction of the three-dimensional network inside the *** a switchable grease/oil state under different irradiation,this work provides a new principle for designing a smart lubricant with controllable friction regulation.

关键词： photo-induced spiropyran switched lubricant friction regulation

Hydration lubrication modulated by water structure at TiO2–aqueous interfaces

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Friction 2024年第4期12卷 591-605页

作者： Pingsu MA Yuan LIU Ke HAN Yu TIAN Liran MA State key laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

The nature of solid-liquid interfaces is of great significance in *** advances have been made in lubrication based on hydration ***,a detailed molecular-level understanding is still ***,we investigated water molecule behaviors at the TiO2-aqueous interfaces by the sum-frequency generation vibrational spectroscopy(SFG-VS)and atomic force microscope(AFM)to elucidate the fundamental role of solid-liquid interfaces in *** contributions of water structures and hydration effects were revealed,where water structures played the dominant role in lubrication for TiO2 surfaces of varying hydrophilicity,while hydration effects dominated with the increasing of ion *** lubrication is observed on the initial TiO2 surfaces with strongly H-bonded water molecules compared to the hydrophilic TiO2 surfaces with more disordered *** stable ordered water arrangement with strong hydrogen bonds and the shear plane occurring between the ordered water layer and subsequent water layer may play a significant role in achieving lower *** adsorbed hydrated molecules with the increasing ionic concentration perturb ordered water but lead to the enhancement of hydration effects,which is the main reason for the improved lubrication for both *** work provides more insights into the detailed molecular-level understanding of the mechanism of hydration lubrication.

关键词： hydration lubrication interfacial water structures hydration effects titanium dioxide(TiO2)

A review of ultrafast laser micro/nano fabrication:Material processing,surface/interface controlling,and devices fabrication

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Nano Research 2024年第7期17卷 6212-6230页

作者： Heng Guo Jiawang Xie Guangzhi He Dezhi Zhu Ming Qiao Jianfeng Yan Jiachen Yu Jiaqun Li Yuzhi Zhao Ma Luo Haoze Han State key laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Ultrafast laser processing technology has offered a wide range of opportunities in micro/nano fabrication and other fields such as nanotechnology,biotechnology,energy science,and photonics due to its controllable processing precision,diverse processing capabilities,and broad material *** processing abilities and applications of the ultrafast laser still need more *** the field of material processing,controlling the atomic scale structure in nanomaterials is *** effects exist in ultrafast laser surface/interface processing,making it difficult to modulate the nanostructure and properties of the surface/interface as *** the ultrafast laser fabrication of micro functional devices,the processing ability needs to be ***,we review the research progress of ultrafast laser micro/nano fabrication in the areas of material processing,surface/interface controlling,and micro functional devices *** useful ultrafast laser processing methods and applications in these areas are *** various processing effects and abilities,the ultrafast laser processing technology has demonstrated application values in multiple fields from science to industry.

关键词： ultrafast laser micro/nano fabrication material processing surface/interface controlling devices fabrication

A novel UHMWPE composite with low friction coefficient for long-term ice sliding

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Friction 2024年第11期12卷 2480-2490页

作者： Yacong HOU Lei CHEN Zheng ZHANG Jinlin CHANG Ding WENG Yuan MA Jiadao WANG State key laboratory of Tribology in Advanced equipment School of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Low friction ice sliding interfaces were critical for ski performance *** fluorinated ski waxes have attracted considerable attention for enhancing the hydrophobicity,anti-wearing,and oxidation resistance of ski–ice ***,the toxicity and complexity of the waxing process limited batch manufacturing of low-cost and non-toxic ski–ice base,what is more,the wax covering on the base wore and failed during skiing due to the friction between ski and ***,we demonstrated a novel ultra-high molecular weight polyethylene(UHMWPE)composite that could maintain a low coefficient of friction(COF)with about 0.026 for at least 160 min when skiing on the ***(MS)could release liquid(liquid paraffin(LP)).The released LP further enhanced the hydrophobicity of UHMWPE’s surfaces when friction occurred,which would maintain the stability and durability of the water film,and achieved superior and long-lasting friction *** with other microcapsules with lower hydrophobic core,microcapsules with LP performed the best in reducing the friction of ski base from 0.126 to ***,the COF of the surface kept at about 0.02 even after 12 rapid temperature *** presented UHMWPE composite of encapsulated liquids showed great potential and broad application owing to its simplicity and efficiency in winter sports.

关键词： microcapsule(MS) ice friction ski liquid paraffin self-lubrication water film

Experiment and modelling of texture and sliding direction dependence on finger friction behavior

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Friction 2024年第9期12卷 1955-1968页

作者： Yuanzhe LI Xue ZHOU Pengpeng BAI Zhonghuan XIANG Yonggang MENG Liran MA Yu TIAN State key laboratory of Tribology in Advanced equipment School of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Humans rely on their fingers to sense and interact with external *** the tribological behavior between finger skin and object surface is crucial for various fields,including tactile perception,product appearance design,and electronic skin *** describing finger frictional behavior is always challenging,given the complex structure of the *** this study,the texture and sliding direction dependence of finger skin friction was quantified based on explicit mathematic *** proposed double-layer model of finger skin effectively described the nonlinear elastic response of skin and predicted the scaling-law of effective elastic modulus with contact ***,the skin friction model on textured surface considering adhesion and deformation factors was *** revealed that adhesive term dominated finger friction behavior in daily life,and suggested that object texture size mainly influenced friction-induced vibrations rather than the average friction *** with digital image correlation(DIC)technique,the effect of sliding direction on finger friction was *** was found that the anisotropy in finger friction was governed by the finger’s ratchet pawl structure,which also contributes to enhanced stick-slip vibrations in the distal sliding *** proposed friction models can offer valuable insights into the underlying mechanism of skin friction under various operating conditions,and can provide quantitative guidance for effectively encoding friction into haptics.

关键词： finger friction tactile perception tribological model textured surface sliding direction

Recent developments in functional organic polymer coatings for biomedical applications in implanted devices

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Friction 2024年第11期12卷 2399-2440,F0004页

作者： Yinuo YANG Yiran JIA Yanran ZHAO Haimang WANG Hongyu ZHANG State key laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Organic polymer coatings have been commonly used in biomedical field,which play an important role in achieving biological antifouling,drug delivery,and *** the continuous development of polymer science,organic polymer coatings can be designed with complex and advanced functions,which is conducive to the construction of biomedical materials with different *** to different physical and chemical properties of materials,biomedical organic polymer coating materials are classified into zwitterionic polymers,non-ionic polymers,and *** strategies of combining coatings with substrates include physical adsorption,chemical grafting,and *** the coating materials and construction methods are different,many biomedical polymer coatings have been developed to achieve excellent performances,i.e.,enhanced lubrication,anti-inflammation,antifouling,antibacterial,drug release,anti-encrustation,anti-thrombosis,***,a large number of biomedical polymer coatings have been used in artificial lungs,ureteral stent,vascular flow diverter,and artificial *** this review,we summarize different types,properties,construction methods,biological functions,and clinical applications of biomedical organic polymer coatings,and prospect future direction for development of organic polymer coatings in biomedical *** is anticipated that this review can be useful for the design and synthesis of functional organic polymer coatings with various biomedical purposes.

关键词： organic polymer coating implanted biomedical device surface grafting method biological performance clinical application

Ultrafast laser processing of camouflaged metals by topography inherited multistep removal for information encryption

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Nano Research 2024年第8期17卷 7242-7249页

作者： Guangzhi He Jianfeng Yan Jiawang Xie Ming Qiao Ma Luo Yuzhi Zhao Haoze Han State key laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Surfaces with micro-nanoscale structures show different optical responses,including infrared reflection,thermal radiation,and protective *** realization of structure camouflage is important for material ***,external cloaks or coatings are necessary in structure camouflage,which limits the surface ***,we propose a novel strategy for the direct structure camouflage through topography inherited removal(TIR)with ultrafast laser,featuring pristine topography preservation and scattering surface *** multistep TIR,pristine topographies are partially and uniformly removed to preserve the original designed *** response changes show the suppression of specular reflection by uniformizing reflected light intensity to a low level on the inherited *** produce various structure camouflages on large scaled substrates,and demonstrate applications of information encryption in code extraction and word recognition through structure *** proposed strategy opens opportunities for infrared camouflage and other technologies,such as thermal management,device security,and information encryption.

关键词： topography inherited removal ultrafast laser structure camouflage optical response information encryption

Design and test of a wheel-belt type cotton stalk puller

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 102-108页

作者： Jialin Cai Jiaxi Zhang Zebin Gao Xiaoxuan Wang Gang Guo Yasenjiang Baikeli Xuepeng Tang Yichao Wang College of mechanical and Electrical Engineering Xinjiang Agricultural UniversityUrumqi 830052China key laboratory of Xinjiang intelligent Agricultural equipment Urumqi 830052China

During the harvesting process,rigid materials are prone to causing damage to the cotton stalks,which will increase the risk of stalk breakage.A cotton stalk pulling component that blends stiff and flexible materials was devised to lower the breaking *** cotton stalk pulling component was made up of rollers and flexible belts that pull the stalks using clamping force and the forward speed of the *** influence of various factors in the equipment on the harvesting effect of cotton stalks were analyzed through response surface experiments,and a multiple quadratic regression response surface model with missing pulling rate and breakage rate as response values was *** significant of influencing factors on the breaking rate of cotton stalks are in a descending order as:the angle of cotton stalk pulling,tractor’s forward speed,and the clamping speed of the cotton stalk *** working parameters of the wheel-belt type cotton stalk pulling machine have been optimized using the response surface combination experimental method,and the optimal parameter combination was obtained as:tractor forward speed of 4.5 km/h,cotton stalk pulling angle of 60°,and clamping speed of the cotton stalk pulling component of 349 r/*** results of validation experiments showed that the missing pulling rate of cotton stalks was 5.06%and the breakage rate was 13.12%,indicating a good harvesting effect of the cotton *** model was reasonable and the performance parameters could meet the relevant inspection *** results can provide a reference for further research on the technology of flexible cotton stalk pulling.

关键词： cotton stalk puller wheeled belt flexible cotton stalks pulling verification testing

Ultrafast laser-chemical modification hybrid fabrication of hydrostatic bearings with a superhydrophobicity solid-liquid interface

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Science China(Technological Sciences) 2024年第3期67卷 696-708页

作者： GUO MingHui RONG YouMin HUANG Yu FENG XiaoLin HU HaiDong WU CongYi ZHANG GuoJun State key laboratory of intelligent manufacturing equipment and Technology Huazhong University of Science and Technology Wuhan 430074China School of mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Faculty of Engineering and Life Sciences Universiti Selangor Bestari JayaSelangor 45600Malaysia

Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation and chemical modification method is proposed to prepare surfaces with microbulge array structure on 6061 aluminum alloy substrates. Because of the low surface energy of the perfluorododecyltriethoxysilane modification and the bulge geometry of the microbulge array structure, the surface shows excellent superhydrophobicity. The optimum contact angle in air for water is 164°, and that for oil is 139°. Two surfaces with “lotus-leaf effect” and “rose-petal effect” were obtained by controlling the processing parameters. The drag reduction properties of superhydrophobic surfaces were systematically investigated with slip lengths of 22.26 and 36.25 μm for deionized water and VG5 lubricant, respectively. In addition, the superhydrophobic surface exhibits excellent mechanical durability and thermal stability. The proposed method provides a new idea for vortex suppression in hydrostatic bearings and improves the stability of bearings in high-speed operation.

关键词： superhydrophobicity surface ultrafast laser drag reduction solid-liquid interface microbulge array structure