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High-efficiency preparation of oil-dispersible MoS2 nanosheets with superior anti-wear property in ultralow concentration

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Abstract

Molybdenum disulfide (MoS2) nanosheets are a promising lubricant additive for enhanced engine efficiency in cars. However, high-cost production methods and poor dispersion have limited their application in industry. In this study, the ball milling process is demonstrated as a low-cost and high-efficient method for fabrication of oil-dispersible MoS2 nanosheet, and the ball milling parameters are optimized. Moreover, the lubrication effectiveness of ball-milled MoS2 nanosheet was also evaluated. Results indicated that well-dispersed MoS2 nanosheets with a size of 250 nm can be manufactured with optimized surfactants of zinc dialkyldithiphosphates (ZDDP) and polyisobutylene succinimide (PIBS) after being ball milled for 36 h. Tribological results revealed that a friction coefficient of white oil with 0.25% MoS2 nanosheets reached 0.075, much lower than that of lubricant without nanosheets (0.16). The wear scar radius of 0.015% MoS2 nanosheets was similar with that of Hertz contact, and the wear scar radius reduction reached 20% compared with that of 1% ZDDP. In addition, EDS and XPS results indicated the formation of a MoS2 and FeS tribofilm on the wear surface.

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Funding

The project was supported by the School-Enterprise Cooperation Project (Grant No. 20130412) and China Shipbuilding Industry Corporation (Grant No. J20140204). The first author thanks financial support from the China Scholarship Council (CSC, No. 201606280181).

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Authors and Affiliations

  1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Hongxing Wu, Liping Wang & Guangneng Dong

  2. Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208-3113, USA

    Hongxing Wu & Blake Johnson

  3. China Shipbuilding Industry Corporation, Shanghai, 200031, People’s Republic of China

    Shuncheng Yang & Junfeng Zhang

Authors
  1. Hongxing Wu
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  2. Blake Johnson
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  3. Liping Wang
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  4. Guangneng Dong
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  5. Shuncheng Yang
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  6. Junfeng Zhang
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Correspondence to Guangneng Dong.

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Wu, H., Johnson, B., Wang, L. et al. High-efficiency preparation of oil-dispersible MoS2 nanosheets with superior anti-wear property in ultralow concentration. J Nanopart Res 19, 339 (2017). https://doi.org/10.1007/s11051-017-4035-z

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  • DOI: https://doi.org/10.1007/s11051-017-4035-z

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