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Recent advances in ocular lubrication

Friction 2024年第9期12卷 1929-1954页

作者： Jianhua ZHANG Yunjuan SU Jian WU Hongdong WANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

The ocular lubrication,where the eyelid constantly slides on the curved corneal surface,is considered as one of primary lubrication systems in *** reliable lubrication conditions,sensitive ocular tissues remain intact from fatigue damage during spontaneous blink *** tear film,evenly filled between cornea and conjunctiva,is a biological fluid with dynamic adjustment ability,which provides superior lubrication with the friction coefficient of below ***,the lubrication failure may result in a variety of uncomfortable symptoms such as inflammatory reactions,tissue damage and neurological ***,it is essential to clarify the fundamental mechanism of ocular lubrication,which helps to alleviate and even recover from various ocular *** review firstly demonstrates that the ocular components,containing lipids and mucins,contribute to maintaining the lubrication stability of tear ***,the ocular lubrication state in various physiological environments and the physical effect on tear film dynamics are further *** typical applications,the therapeutic agents of dry eye syndrome and contact lens with superior lubrication effects are introduced and their lubrication mechanisms are ***,this review summarizes a series of the latest research inspired by ocular ***,this work will provide a valuable guidance on the theoretical research and extensive applications in the field of biological lubrication.

关键词： bio-tribology ocular lubrication tear film dry eye syndrome tear film dynamics

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Superlubricity achieved by polyvinylpyrrolidone at Si3N4/sapphire interfaces

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摩擦（英文版） 2025年第6期13卷 112-121页

作者： Hongdong Wang Zhen Luo Kunpeng Wang Yuhong Liu Jianhua Zhang School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Polymers have complex molecular structures that often lead to interchain friction and hinder movement,making it difficult to achieve ***,in the field of hydration lubrication,the electronegative interface of ceramics readily adsorbs water molecules,creating a protective water film that covers the frictional interface and effectively reduces *** achieve hydration lubrication,it is essential to create a continuous lubricating film by selectively enriching specific functional groups of adsorbed water molecules from the polymer solution onto the ceramic *** adsorbing a hydrophilic layer composed of polyvinylpyrrolidone with pyrrolidone groups onto a negatively charged Si3N4/sapphire interface,we formed a continuous lubricating *** has shown that the interaction between the polymer chain structure of polyvinylpyrrolidone molecules(such as PVP10000)in solution and water molecules could result in excellent *** the contact pressure exceeds 198 MPa,the coefficients of friction(COF)can be reduced to *** detailed surface analyses and sophisticated simulations,we uncovered the underlying mechanism *** pyrrolidone moieties of polyvinyl pyrrolidone(PVP)formed hydrogen bonds with the Si3N4 surface,transforming the initially difficult frictional interface into a PVP/sapphire interface with significantly reduced sliding energy *** findings highlight the vital role of PVP in superlubricity and hydration lubrication and provide a theoretical and experimental basis for the design of materials and lubricants with exceptional lubricating properties.

关键词： superlubricity polyvinyl pyrrolidone(PVP) hydration lubrication molecular simulation

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Optimizing Photonic Annealing Technique for Full-Solution-Processed Oxide Thin Film Transistor

Optimizing Photonic Annealing Technique for Full-Solution-Pr...

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International Conference on display Technology, 2024

作者： Xu, Meng Li, Xifeng Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China

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Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions

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Friction 2023年第7期11卷 1138-1149页

作者： Wenrui LIU Hongdong WANG Yuhong LIU State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

Polyalkylene glycol(PAG)aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient(COF,μ<0.01).However,the prolonged running-in period and low bearing capacity have limited its widespread *** this study,we determined that the running-in period can be decreased by more than 75%when the pH value of the lubricant is controlled at 3 by introducing various acid ***,less time was required to realize stable superlubricity with inorganic acid at lower pH *** was mainly attributed to the acceleration effect of hydrogen ions around the contact *** case of PAG aqueous solution with organic acid,the wear loss between sliding solid surfaces was reduced,and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 ***,the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid *** in turn strengthened the structure of the adsorption *** unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications.

关键词： superlubricity running-in time bearing pressure organic acid hydrogen bond

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Simple and effective:Superlubricity behaviour of the G-quadruplex hydrogel with high selectivity for K^(+) ions based on the ocular environment

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Friction 2024年第11期12卷 2548-2562页

作者： Hongdong WANG Jian WU Kunpeng WANG Yunjuan SU Xiacong ZHANG Yuhong LIU Jianhua ZHANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Hydrogels have been the subject of significant research in the field of friction due to their exceptional lubricating *** this study,the G-quadruplex hydrogel with high selectivity for K^(+) ions was formed by introducing a mixture of G,2-formylphenylboronic acid,and polyethylene glycol diamine into simulated artificial tears solution with high transparency,and an ultra-low coefficient of friction(COF)of about 0.004 was obtained based on the simulated ocular environment,thus achieving macroscopic *** friction pairs simulating the ocular environment,to assess the frictional performance of the G-quadruplex hydrogel as both a lubricant and a friction pair based on the simulated ocular environment,we conducted experiments considering various factors such as concentration,sliding speed,and *** these experiments,it was found that superlubricity was achieved when the G-quadruplex hydrogel was applied as lubricant or friction *** effect was attributed to the three-dimensional network structure and hydrophilicity of the hydrogel,which facilitated the formation of a highly bearing and flowing hydration layer,promoting macroscopic *** to the G-quadruplex hydrogel with low concentration,the high concentration hydrogel(75 mM)exhibited increased mechanical strength and robustness in *** with biocompatibility experiments,our synthesized G-quadruplex hydrogel has excellent biocompatibility and offers a novel approach to achieve superlubricity in ocular drug delivery.

关键词： superlubricity ocular environment G-quadruplex hydrogel bio-compatibility

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Artificial synapses based on organic electrochemical transistors with self-healing dielectric layers

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Chinese Chemical Letters 2024年第3期35卷 423-427页

作者： Yushan Gao Junyao Zhang Dapeng Liu Tongrui Sun Jun Wang Li Li Shilei Dai Jianhua Zhang Zhenglong Yang Jia Huang School of Materials Science and Engineering Tongji UniversityShanghai 201804China Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200072China National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji UniversityShanghai 201804China

Organic electrochemical transistors(OECTs)have emerged as one type of promising building block for neuromorphic systems owing to their capability of mimicking the morphology and functions of biological neurons and ***,numerous kinds of OECTs have been developed,while self-healing performance has been neglected in most reported *** this work,the OECTs using self-healing polymer electrolytes as dielectric layers are *** important synaptic behaviors are simulated in the OECTs by doping the channel layers with ions from the *** from the dynamic hydrogen bonds in the self-healing polymer electrolytes,the OECTs can successfully maintain their electrical performance and the ability of emulating synaptic behaviors after self-healing compared with the initial *** significantly,the sublinear spatial summation function is demonstrated in the OECTs and their potential in flexible electronics is also *** results suggest that our devices are expected to be a vital component in the development of future wearable and bioimplantable neuromorphic systems.

关键词： Organic electrochemical transistors Artificial synapses Synaptic behaviors Self-healing Flexibility

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A skin-conformal and breathable humidity sensor for emotional mode recognition and non-contact human-machine interface

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npj Flexible Electronics 2024年第1期8卷 929-937页

作者： Tongkuai Li Tingting Zhao Hao Zhang Li Yuan Congcong Cheng Junshuai Dai Longwei Xue Jixing Zhou Hai Liu Luqiao Yin Jianhua Zhang Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai University149 Yanchang RoadShanghai 200072China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University333 Nanchen RoadShanghai 200444China School of Microelectronics Shanghai University20 Chengzhong RoadShanghai 201800China

Noncontact humidity sensor overcomes the limitations of its contact sensing counterparts,including mechanical wear and cross infection,which becomes a promising candidate in healthcare and human-machine interface ***,current humidity sensors still suffer the ubiquitous issue of uncomfortable wear and skin irritation hindering the long-term *** this study,we report a skin-conformal and breathable humidity sensor assembled by anchoring MXenes-based composite into electrospun elastomer nanofibers coated with a patterned *** composite is highly sensitive to the water molecules due to its large specific surface area and abundant water-absorbing hydroxyl groups,while the elastomeric nanofibers provide an ultrathin,highly flexible,and permeable substrate to support the functional materials and *** sensor presents not only excellent air permeability(0.078 g cm^(−2)d^(−1)),high sensitivity(S=704),and fast response/recovery(0.9 s/0.9 s),but also high skin conformability and ***,this humidity sensor is confirmed to realize the recognition of motional states and emotional modes,which provides a way for the advanced noncontact human-machine interface.

关键词： composite interface conformal

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Experimental study of the circular subsonic pipe jet expanding into near vacuum environment

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Science China(Physics,Mechanics & Astronomy) 2025年

作者： Xin Chen Fangyuan Liu Yu-Ze Wang Si-Yu Zhang Qingxiang Li Jian-Zhao Wu Bo-Fu Wang Kai Leong Chong Cheng Wang Jian-Hua Zhang Quan Zhou Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering Science Shanghai University Zhangjiang Laboratory School of Microelectronics Key Laboratory of Advanced Display and System Application of Ministry of EducationShanghai University

In extreme ultraviolet(EUV) lithography, mitigation of tin(Sn) debris contamination during EUV light generation is an important issue. In practice, the high-speed jet flows are used to transport debris away from the collector mirror, thereby protecting it and improving system performance. Since EUV light is generated in a near-vacuum environment, understanding jet flow behavior in these extreme conditions is crucial for effective contamination control. In this study, we introduce a new facility designed to investigate jet extruded into near-vacuum environments using particle image velocimetry(PIV) and particle tracking velocimetry(PTV). Our results reveal a significantly extended potential core and a “top-hat” velocity profile with an inlet flow rate of 0.28standard liter per minute(SLPM) and ambient pressure of 13.9 Pa. We also investigate the effects of inlet flow rate, ambient pressure, and jet diameter on the centerline streamwise velocity of the jet flow. These findings aim to guide the design of equipment operating in vacuum conditions.

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Efficient Certificateless Conditional Privacy-Preserving Authentication Scheme with Dynamic Pseudonyms for VANETs

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IEEE Sensors Journal 2025年

作者： Chen, Shangji Guan, Yepeng Shanghai University Key Laboratory of Advanced Display and System Application of Ministry of Education School of Communication and Information Engineering Shanghai China

Vehicular Ad hoc Networks (VANETs) are essential technology in intelligent transportation systems, enhancing traffic safety and improving traffic flow management. However, the increasing transmission of sensitive data raises serious security and privacy concerns. Existing certificateless aggregate signature (CLAS)-based authentication schemes face the following limitations in addressing these challenges: First, the complex construction leads to high computational overhead. Second, some schemes have security vulnerabilities and overlook physical-layer protection. Third, pseudonyms are tied to the key generated by trusted authority (TA) in a one-to-one relationship. To address these issues, we propose an efficient identity authentication scheme with conditional privacy-preserving, named ECPAS. By restructuring the existing CLAS scheme and utilizing pairing-free operations to achieve efficiency in computation. Also, ECPAS allows vehicles to cooperate with TA in generating dynamic pseudonyms and key pairs, avoiding key escrow and enhancing privacy. Moreover, the pseudonym of vehicle is generated by biometric identity and two hash seeds, so that the computation and storage overhead can be reduced efficiently under the condition that security is guaranteed. We performed formal and informal analysis that shows ECPAS satisfies the security requirements of VANETs. Finally, experimental results show that ECPAS outperforms existing schemes in computational cost, communication overhead, and transmission delay, and NS3-based simulations further validate its practicality and scalab.lity. © 2001-2012 IEEE.

关键词： Street traffic control

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Color liquid crystal grating based color holographic 3D display system with large viewing angle

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Light(Science & applications) 2024年第1期13卷 103-112页

作者： Di Wang Yi-Long Li Fan Chu Nan-Nan Li Zhao-Song Li Sin-Doo Lee Zhong-Quan Nie Chao Liu Qiong-Hua Wang School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Display Technology Research Center Seoul National UniversityGwanak-ro 1Gwanak-guSeoul 08826Republic of Korea Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

Holographic 3D display is highly desirable for numerous applications ranging from medical treatments to military ***,it is challenging to simultaneously achieve large viewing angle and high-fidelity color reconstruction due to the intractable constraints of existing ***,we conceptually propose and experimentally demonstrate a simple and feasible pathway of using a well-designed color liquid crystal grating to overcome the inevitable chromatic aberration and enlarge the holographic viewing angle,thus enabling large-viewing-angle and color holographic 3D *** use of color liquid crystal grating allows performing secondary diffraction modulation on red,green and blue reproduced images simultaneously and extending the viewing angle in the holographic 3D display *** principle,a chromatic aberration-free hologram generation mechanism in combination with the color liquid crystal grating is proposed to pave the way for on such a superior holographic 3D *** proposed system shows a color viewing angle of~50.12°,which is about 7 times that of the traditional system with a single spatial light *** work presents a paradigm for achieving desirable holographic 3D display,and is expected to provide a new way for the wide application of holographic display.

关键词： holographic angle crystal

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