Abstract
Nanomaterials as lubricating oil additives have attracted significant attention because of their designable composition and structure, suitable mechanical property, and tunable surface functionalities. However, the poor compatibility between nanomaterials and base oil limits their further applications. In this work, we demonstrated oil-soluble poly (lauryl methacrylate) (PLMA) brushes-grafted metal-organic frameworks nanoparticles (nanoMOFs) as lubricating oil additives that can achieve efficient friction reduction and anti-wear performance. Macroinitiators were synthesized by free-radical polymerization, which was coordinatively grafted onto the surface of the UiO-67 nanoparticles. Then, PLMA brushes were grown on the macroinitiator-modified UiO-67 by surface-initiated atom transfer radical polymerization, which greatly improved the lipophilic property of the UiO-67 nanoparticles and significantly enhanced the colloidal stability and long-term dispersity in both non-polar solvent and base oil. By adding UiO-67@PLMA nanoparticles into the 500 SN base oil, coefficient of friction and wear volume reductions of 45.3% and 75.5% were achieved due to their excellent mechanical properties and oil dispersibility. Moreover, the load-carrying capacity of 500 SN was greatly increased from 100 to 500 N by the UiO-67@PLMA additives, and their excellent tribological performance was demonstrated even at a high friction frequency of 65 Hz and high temperature of 120 °C. Our work highlights oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient lubricating additives.
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11 July 2024
An Erratum to this paper has been published: https://doi.org/10.1007/s40544-024-0955-7
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Acknowledgements
This work was supported by the Research Fund of State Key Laboratory of Solidification Processing (NPU) (2022-QZ-04) and the National Natural Science Foundations of China (52071270). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University and Shaanxi Materials Analysis and Research Center.
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The authors have no competing interests to declare that are relevant to the content of this article. The author Feng ZHOU is the Editorial Board Member of this journal.
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Jianxi LIU. He is currently a professor at Northwestern Polytechnical University, China. He obtained his Ph.D. degree from Karlsruhe Institute of Technology, Germany, in 2015. He performed postdoctoral research at the Northwestern University, USA, from 2016 to 2018. In 2018, he started his independent research career at Northwestern Polytechnical University, China. Currently, his research interests focus on smart lubrication, multifunctional coatings, nanofabrication and optical sensing.
Yong QIAN. He received his bachelor’s degree in materials science and engineering in 2021 from the University of South China, China, and his master’s degree in the Center of Advanced Lubrication and Sealing Materials in 2024 from Northwestern Polytechnical University, China. His research interests include studying composite materials based on MOFs and their anti-friction and wear properties.
Feng ZHOU. He is a full professor in Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, China, and head of Lanzhou Institute of Chemical Physics and State Key Laboratory of Solid Lubrication, China. He gained his Ph.D. degree in 2004 and spent three years (2005–2008) in the Department of Chemistry, University of Cambridge, UK, as a research associate. He has published more than 500 journal papers, which have received more than 28,000 citations and have a high-index of 90. His research interests include bioinspired tribology, biomimic surfaces/interfaces of soft matter, drag-reduction, anti-biofouling, and boundary lubrication.
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Liu, J., Qian, Y., Li, D. et al. Oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient friction and wear reduction. Friction 12, 1499–1511 (2024). https://doi.org/10.1007/s40544-023-0823-x
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DOI: https://doi.org/10.1007/s40544-023-0823-x