Abstract
Inorganic nanoparticles have been proved as powerful lubricant additives at elevated temperature. However, the tribological properties are inevitably impaired due to poor dispersion and insufficient high temperature resistance of organic matter modified nanoparticles. Here, we prepare a self-dispersed molybdenum disulfide quantum dot/graphene crumpled ball (MGCB) comprising molybdenum disulfide quantum dot uniformly interspersed on the wrinkled graphene ball. The crumpled ball composite possesses excellent dispersity in polyalkylene glycol base oil without depending on surface modifiers. Compared with the conventional phosphate esters lubricant, our results indicate MGCB could vastly improve the lubrication performance of polyalkylene glycol with an extremely low concentration (0.05 wt%) at elevated temperature (150 °C), showing a friction reduction of 47% and a wear reduction of 30% compared with the conventional phosphate esters lubricant (tricresyl phosphate, TCP). This is because crumpled ball potentiates synergistic lubrication effect within the boundary lubrication. Overall, we envision our designed self-dispersed MGCB has significant potential in tribological application at elevated temperature.
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We acknowledge the financial support provided by the National Natural Science Foundation of China (52105180, 52305189) and the Key Technologies R&D Program of Henan Province (212102210125).
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Guiru DU. She is now a Ph.D. student at Engineering Research Center for Nanomaterials, Henan University, Kaifeng, China. Her current research focuses on preparation and tribological properties investigation of carbon-based material.
Ningning SONG. She received her Ph.D. in chemical engineering and technology from Shanghai Jiao Tong University in 2019 and joined Engineering Research Center for Nanomaterials of Henan University as a lecturer in the same year. Her main research interest is the synthesis of graphene-based composite and application in lubrication field.
Shengmao ZHANG. He graduated from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences in 2005. His main research interest is the synthesis of high-performance nano-lubricant materials and tribological mechanism research.
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Du, G., Zhang, Y., Fan, S. et al. Self-dispersed molybdenum disulfide quantum dot/graphene crumpled ball as efficient high temperature lubricant additive. Friction 12, 1771–1784 (2024). https://doi.org/10.1007/s40544-023-0853-4
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DOI: https://doi.org/10.1007/s40544-023-0853-4