• 文献标题:   Functionalized graphene-oxide nanosheets with amino groups facilitate macroscale superlubricity
  • 文献类型:   Article
  • 作  者:   GE XY, CHAI ZY, SHI QY, LI JJ, TANG JW, LIU YF, WANG WZ
  • 作者关键词:   functionalized grapheneoxide, aminated grapheneoxide, superlubricity, antifriction antiwear
  • 出版物名称:   FRICTION
  • ISSN:   2223-7690 EI 2223-7704
  • 通讯作者地址:  
  • 被引频次:   5
  • DOI:   10.1007/s40544-021-0583-4 EA APR 2022
  • 出版年:   2023

▎ 摘  要

Graphene-oxide (GO) has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, the functional groups of GO that can contribute to anti-friction, anti-wear, and superlubricity are yet to be elucidated. Hence, further improvement in GO-family materials in tribology and superlubricity fields is impeded. In this study, macroscale superlubricity with a coefficient of friction of less than 0.01 is achieved by exploiting the high adhesive force between amino groups within aminated GO (GO-NH2) nanosheets and SiO2. It was observed that GO-NH2 nanosheets form a robust adsorption layer on the worn surfaces owing to the high adsorption of amino groups. This robust GO-NH2 adsorption layer not only protects the contact surfaces and contributes to low wear, but also causes the shearing plane to transform constantly from solid asperities (high friction) into GO-NH2 interlayers (weak interlayer interactions), resulting in superlubricity. A SiO2-containing boundary layer formed by tribochemical reactions and a liquid film are conducive to low friction. Such macroscale liquid superlubricity provides further insights into the effect of functional groups within functionalized GO materials and a basis for designing functionalized GO materials with excellent tribological performances.