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High-performance lubricant additives based on modified graphene oxide by ionic liquids.

Xiaoqiang Fan1, Liping Wang2

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

Journal of Colloid and Interface Science
|May 4, 2015
PubMed
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Modified graphene oxide (MGO) additives enhance lubricant performance. MGO, derived from graphene oxide and ionic liquids, significantly reduces friction and wear in multialkylated cyclopentanes (MACs).

Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Graphene oxide (GO) possesses functional groups enabling chemical modifications.
  • Ionic liquids (ILs) can interact with GO through various mechanisms.
  • Lubricant additives are crucial for improving tribological performance.

Purpose of the Study:

  • To prepare modified graphene oxide (MGO) using specific ionic liquids.
  • To investigate the stability and tribological properties of MGO and modified graphene (MG) as additives in multialkylated cyclopentanes (MACs).
  • To understand the mechanism behind the improved tribological performance.

Main Methods:

  • Graphene oxide (GO) was chemically modified using three alkyl imidazolium ionic liquids (ILs) via epoxide ring-opening, cation-π stacking, or van der Waals interactions.
Keywords:
GrapheneGraphene oxideIonic liquidsModificationTribology

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  • Modified graphene (MG) was prepared using LB104 via an electrochemical method for comparison.
  • The stability and tribological properties (friction and wear) of MGO and MG as additives in MACs were evaluated.

    • Main Results:

    • Chemical modification using ILs converted GO into graphene.
    • MGO exhibited good dispersion and stability in MACs.
    • MGO significantly improved tribological performance, reducing friction by ~27% and wear by ~74% compared to pure MACs.

    Conclusions:

    • Modified graphene oxide (MGO) is an effective lubricant additive for multialkylated cyclopentanes (MACs).
    • The enhanced tribological properties are due to the formation of an ILs-containing graphene-rich tribofilm.
    • This tribofilm acts as a third body, preventing direct surface contact and improving friction reduction and anti-wear capabilities.