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Probing the intriguing frictional behavior of hydrogels during alternative sliding velocity cycles

摩擦:英文版 2023年第12期11卷 2329-2341页

作者： Yiming ZHAO Gang YI Jiuyu CUI Ziqian ZHAO Yonggan YAN Luxing WEI Jinlong SHAO Hongbo ZENG Jun HUANG Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education National Demonstration Center for Experimental Mechanical Engineering EducationSchool of Mechanical EngineeringShandong UniversityJinan 250061China Shandong Key Laboratory of Advanced Organosilicon Materials and Technologies Zibo 256401China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada Department of Periodontology School and Hospital of StomatologyCheeloo College of MedicineShandong University&Shandong Key Laboratory of Oral Tissue RegenerationJinan 250061China Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration Jinan 250012China

Understanding the friction behavior of hydrogels is critical for the long-term stability of hydrogelrelated bioengineering applications.Instead of maintaining a constant sliding velocity,the actual motion of bio-components(e.g.,articular cartilage and cornea)often changes abruptly.Therefore,it is important to study the frictional properties of hydrogels serving under various sliding velocities.In this work,an unexpected low friction regime(friction coefficientμhydrogel was rotated against a glass substrate under alternative sliding velocity cycles.Interestingly,compared with the friction coefficients under constant sliding velocities,the measuredμdecreased significantly when the sliding velocity changed abruptly from high speeds(e.g.,105 rad/s)to low speeds(e.g.,1.05×10^(-3) rad/s).In addition,μexhibited a downswing trend at low speeds after experiencing more alternative sliding velocity cycles:the measuredμat 1.05 rad/s decreased from 2×10^(-2) to 3×10^(-3) after 10 friction cycles.It is found that the combined effect of hydration film and polymer network deformation determines the lubrication and drag reduction of hydrogels when the sliding velocity changes abruptly.The observed extremely low friction during alternative sliding velocity cycles can be applied to reduce friction at contacted interfaces.This work provides new insights into the fundamental understanding of the lubrication behaviors and mechanisms of hydrogels,with useful implications for the hydration lubrication related engineering applications such as artificial cartilage.

关键词： hydrogel friction alternative sliding velocity ultra-low friction coefficient drag reduction

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