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Scalable Fabrication of Modified Graphene Nanoplatelets as an Effective Additive for Engine Lubricant Oil

机译：改性石墨烯纳米片的可扩展制备作为发动机润滑油的有效添加剂

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The use of nano-additives is widely recognized as a cheap and effective pathway to improve the performance of lubrication by minimizing the energy loss from friction and wear, especially in diesel engines. In this work, a simple and scalable protocol was proposed to fabricate a graphene additive to improve the engine lubricant oil. Graphene nanoplates (GNPs) were obtained by a one-step chemical exfoliation of natural graphite and were successfully modified with a surfactant and an organic compound to obtain a modified GNP additive, that can be facilely dispersed in lubricant oil. The GNPs and modified GNP additive were characterized using scanning electron microscopy, X-ray diffraction, atomic force microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. The prepared GNPs had wrinkled and crumpled structures with a diameter of 10–30 µm and a thickness of less than 15 nm. After modification, the GNP surfaces were uniformly covered with the organic compound. The addition of the modified GNP additive to the engine lubricant oil significantly enhanced the friction and antiwear performance. The highest reduction of 35% was determined for the wear scar diameter with a GNP additive concentration of approximately 0.05%. The mechanism for lubrication enhancement by graphene additives was also briefly discussed.
机译：纳米添加剂的使用已被广泛认为是一种廉价有效的途径，可通过最大程度地减少摩擦和磨损产生的能量损失来改善润滑性能，尤其是在柴油发动机中。在这项工作中，提出了一种简单且可扩展的协议来制造石墨烯添加剂以改善发动机润滑油。石墨烯纳米板（GNP）是通过天然石墨的一步化学剥落而获得的，并成功地用表面活性剂和有机化合物进行了改性，从而获得了可以方便地分散在润滑油中的改性GNP添加剂。使用扫描电子显微镜，X射线衍射，原子力显微镜，拉曼光谱和傅里叶变换红外光谱对GNP和改性的GNP添加剂进行表征。制备的GNP具有皱纹和皱纹结构，直径为10–30 µm，厚度小于15 nm。改性后，GNP表面均匀地覆盖有有机化合物。在发动机润滑油中添加改性的GNP添加剂可显着增强摩擦和抗磨性能。对于磨损痕迹直径，GNP添加剂浓度约为0.05％，确定了最高减少35％。还简要讨论了石墨烯添加剂增强润滑的机理。

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