The preparation of CeF3 nanocluster capped with oleic acid by extraction method and application to lithium grease |
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| Authors: | Libo Wang Ming Zhang Xiaobo Wang Weimin Liu |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China;1. Universidad de Monterrey, Departamento de Ingeniería, Av. Morones Prieto 4500 Pte. San Pedro Garza García, N. L. 66238, Mexico;2. Instytut Technologii Eksploatacji, Department of Tribology, Ul. K. Pulaskiego 6/10, 26-600 Radom, Poland;1. SKF Engineering & Research Centre, Nieuwegein, The Netherlands;2. University of Twente, Enschede, The Netherlands;1. Universidade Federal de Minas Gerais (UFMG), Postgraduate Program on Metallurgical, Materials and Mining Engineering, Brazil;2. Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Department of Chemistry, Brazil;3. Universidade Federal do Rio de Janeiro (UFRJ), Program of Metallurgical and Materials Engineering, Brazil;4. National Institute of Science and Technology on Mineral Resources, Water and Biodiversity (INCT-Acqua), Brazil;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK;4. Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, China |
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| Abstract: | CeF3 nanocluster surface-capped with oleic acid (coded as OA-CeF3) were prepared using extraction method. The resulting OA-CeF3 nanocluster was characterized by means of transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transformation infrared spectrometry (FTIR), and X-ray photoelectron spectroscopy (XPS). The effect of the OA-CeF3 nanocluster as an additive in synthetic lithium grease was investigated using a four-ball friction and wear tester. It was found that the as-prepared OA-CeF3 nanocluster had a broad size distribution, with the average diameter to be about 20 nm, which was confirmed by both the XRD and TEM analytical results. The oleic acid as the capping agent was chemically bonded to the CeF3 nanocores via strong chemical interaction. The OA-CeF3 nanocluster as the additive led to an obvious improvement in the antiwear and extreme pressure properties of the synthetic lithium grease. However, the OA-CeF3 nanocluster as the additive had little effect on the friction-reducing behavior of the lithium grease. |
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