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–NH_(2)) nanosheets and SiO_(2). It was observed that GO–NH_(2) nanosheets form a robust adsorption layer on the worn surfaces owing to the high adsorption of amino groups. This robust GO–NH_(2) 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–NH_(2) interlayers (weak interlayer interactions), resulting in superlubricity. A SiO_(2)-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.
出处
《Friction》
SCIE
EI
CAS
CSCD
2023年第2期187-200,共14页
摩擦（英文版）
基金
the National Key R&D Program of China(Nos.2020YFB2007300,2020YFA0711003)
the Foundation from State Key Laboratory of Tribology(No.SKLTKF20B01)
Beijing Institute of Technology Research Fund Program for Young Scholars,the Fund of Key Laboratory of Advanced Materials of Ministry of Education(No.ADV21-4)
the National Natural Science Foundation of China(No.52005287).
