首页|Exploring the relevance between load-bearing capacity and surface friction behavior based on a layered hydrogel cartilage prototype

Exploring the relevance between load-bearing capacity and surface friction behavior based on a layered hydrogel cartilage prototype

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Cartilage is well lubricated over a lifetime and this phenomenon is attributed to both of the surface hydration lubrication and the matrix load-bearing capacity.Lubricious hydrogels with a layered structure are designed to mimic cartilage as potential replacements.While many studies have concentrated on improving surface hydration to reduce friction,few have experimentally detected the relationship between load-bearing capacity of hydrogels and their interface friction behavior.In this work,a bilayer hydrogel,serving as a cartilage prototype consisted of a top thick hydrated polymer brush layer and a bottom hydrogel matrix with tunable modulus was designed to investigate this relationship.The coefficient of friction(COF,μ)is defined as the sum of interfacial component(μInt)and deformation/hysteresis component(μHyst).The presence of the top hydration layer effectively dissipates contact stress and reduces the interface interaction(μInt),leading to a stable and low COF.The contribution of mechanical deformation(μHyst)during the sliding shearing process to COF can be significantly reduced by increasing the local mechanical modulus,thereby enhancing the load-bearing capacity.These results show that the strategy of coupling surface hydration layer with a high load-bearing matrix can indeed enhance the lubrication performance of hydrogel cartilage prototypes,and implies a promising routine for designing robust soft matter lubrication system and friction-control devices.

soft contacthydration,deformationload-bearingfriction control

Yunlei ZHANG、Weiyi ZHAO、Xiaoduo ZHAO、Jinshuai ZHANG、Bo YU、Shuanhong MA、Feng ZHOU

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State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China

Shandong Laboratory of Yantai Advanced Materials and Green Manufacture,Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering,Yantai 264006,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesOutstanding Youth Fund of Gansu ProvinceKey Research Project of Shandong Provincial Natural Science FoundationGansu Province Basic Research Innovation Group ProjectWest Light Foundation of The Chinese Academy of Sciences

220320065207552252322506XDB 047020121JR7RA095ZR2021ZD2722JR5RA093xbzgzdsys-202211

2024

10.1007/s40544-023-0846-3

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CSTPCDEI
ISSN：2223-7690
年,卷(期)：2024.12(8)
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