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    • One-step Strategy of Cellulose-Assisted Ionic Liquids to Realize the Integration of Graphite Exfoliation and Surface Functionalization

    Zhiqiang Shan,Xiaohua Jia,Ding Wang,Jin Yang,Zhaofeng Wang,Haojie Song

    COMPOSITES COMMUNICATIONS（2025）

    Cited 0|Views4
    Abstract
    Graphene has been widely applied in the field of lubrication due to its high in-plane strength, interlayer slipping capability, and chemical stability. Although important advances have been made in the preparation and surface functionalization techniques of high-quality graphene nanosheets (GNS), the pulverizing effect of mechanical exfoliation and the destructive effect of chemical exfoliation can lead to degradation of GNS quality and the production of micro flakes. Herein, large-sized GNS was prepared using cellulose nanofibrils (CNF) constructed as mesh cages to limit the aggregation and sedimentation of flake graphite in water, which facilitated the exfoliation and functionalization of graphite by ionic liquids-CNF (ILs-CNF). The interlayer space of graphite was increased during hydrothermal process and the ILs molecules were entered into the interlayers of bulk graphite. The unbound CNF surface is enriched with ILs and enters into the swollen flake graphite interlayer subsequently, achieving the non-destructive exfoliation of graphite. The ILs-CNF functionalized GNS (IC-G) can be obtained by mechanical shock treatment. Furthermore, IC-G was introduced into the epoxy resin/poly-tetrafluorowax hybrid matrix (EP@PFW) to obtain the monolithic composites with excellent self-lubricating properties.
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    Key words
    Graphene,Nanocellulose,Ionic liquids,Surface properties
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