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Colloidal suspension of graphene oxide in ionic liquid as lubricant

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Abstract

In this paper, we successfully prepared stable colloidal suspensions of chemically modified graphene oxide (MGO) in hydrophobic ionic liquid (IL) as a lubricant. The graphene oxide (GO) sheets were synthesized from natural graphite by modified Hummers method. To achieve stable dispersion, a surfactant containing ionic liquid unit with carboxylic acid group was synthesized and covalently grafted on GO sheets surfaces. The stability of the MGO/IL colloid was attributed to the high affinity of the surfactant, which might provide sufficient steric and electrostatic repulsions. Tribological results showed that the lubrication property of MGO/IL nanofluids has been improved significantly compared with neat IL. In addition, the lubricating effect is connected with the concentration of the MGO in IL. At the low concentration, the lubricity is ineffective. While at high concentration, the MGO sheets aggregate and the characteristic of interlayer sliding of MGO is no more active. The nanofluids with moderate MGO concentration exhibit good performance both in friction and wear resistance.

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Acknowledgements

The authors are grateful for the support provided by the National Natural Science Foundation of China (No. 51475241) and the Fundamental Research Funds for the Central Universities (No. NE2017104).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Yudao Street 29#, Nanjing, 210016, China

    Tingxia He, Qingwen Dai, Wei Huang & Xiaolei Wang

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  1. Tingxia He
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  2. Qingwen Dai
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  3. Wei Huang
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  4. Xiaolei Wang
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Correspondence to Wei Huang.

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He, T., Dai, Q., Huang, W. et al. Colloidal suspension of graphene oxide in ionic liquid as lubricant. Appl. Phys. A 124, 777 (2018). https://doi.org/10.1007/s00339-018-2207-z

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