Evaluation of dispersibility of amine-modified graphene and ionic liquids based additive in lubricant
DOI:
https://doi.org/10.62239/jca.2026.018Keywords:
reduced graphene oxide, amine, ionic liquid, additive, lubricantAbstract
To develop highly anti-friction additives, this study designed a synergistic dispersion system combining functionalized reduced graphene oxide (rGO) and an ionic liquids (IL). The experiments evaluated distinct components: octylamine-functionalized rGO (rGO-OcA at 0.004 wt%), an ionic liquid (IL at 2 wt%), and a resulting system comprising 0.2 wt% graphene dispersed within the IL base (2 wt% rGO-OcA + IL). The strategy aimed to leverage the long-chain alkylamines of rGO-OcA to establish initial compatibility with the lubricant, while utilizing the IL as a secondary stabilizing agent to prevent nano-additive agglomeration. Stability screening via relative concentration variations over 20 days demonstrated that while octylamine functionalization markedly enhanced baseline dispersibility compared to pristine GO, the rGO-OcA concentration still declined to 73.3%. Crucially, the hybrid system validated the hypothesis: the addition of highly soluble IL successfully arrested this decline, achieving superior long-term colloidal stability through enhanced IL-lubricant solubility and IL-graphene compatibility.
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Copyright (c) 2026 Bui Thi Le Thuy, Nguyen Thi Huyen Nga, Trinh Khac Vu, Ta Thi Toan, Do Thi Hai
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