Two processes of physical liquid phase stripping and chemical redox reduction were used to obtain graphene sheets. Fourier transform infrared spectroscopy and Raman spectroscopy test methods were used to compare and analyze the structure and disorder of graphene. The obtained graphene was modified with oleic acid and stearic acid. The dispersion stability of graphene as a lubricating oil additive was investigated by natural sedimentation method and spectrophotometry. The tribological properties of the graphene dispersion were investigated by a four-ball friction and wear tester. Scanning electron microscope and energy spectrometer were used to characterize and analyze the microscopic morphology and composition of the worn surface. The results showed that the modified liquid phase stripping graphene demonstrated the best anti-wear and anti-friction properties of the dispersion, the lowest friction coefficient is 0.0677, and the average friction coefficient is reduced by about 26%.

中文翻译：

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不同制备工艺对石墨烯摩擦学性能的影响

采用物理液相剥离和化学氧化还原还原两种工艺获得石墨烯片。采用傅里叶变换红外光谱和拉曼光谱测试方法对石墨烯的结构和无序进行比较分析。得到的石墨烯用油酸和硬脂酸改性。采用自然沉降法和分光光度法研究石墨烯作为润滑油添加剂的分散稳定性。通过四球摩擦磨损试验机研究了石墨烯分散体的摩擦学性能。采用扫描电子显微镜和能谱仪对磨损表面的微观形貌和成分进行表征和分析。