Modified Graphene Oxide as an Additive to Enhance the Lubricity of the Ionic Liquid, 1-Heptyl-3-methylimidazolium Bis[(trifluoromethane)sulfonyl]amide
Modified Graphene Oxide as an Additive to Enhance the Lubricity of the Ionic Liquid, 1-Heptyl-3-methylimidazolium Bis[(trifluoromethane)sulfonyl]amide
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DOI：
10.1021/acsaenm.2c00177
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Sujoy Talukder;J. Kaur;Jeremy Lawerence;Jiahe Xu;Ramesh Choudhary;C. Korzeniewski;E. Quitevis;Chang-Dong Yeo
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文献类型：
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作者：
Sujoy Talukder;J. Kaur;Jeremy Lawerence;Jiahe Xu;Ramesh Choudhary;C. Korzeniewski;E. Quitevis;Chang-Dong Yeo
纳米碳产品和石墨烯衍生物通常作为添加剂应用于基础润滑剂中，以减少接触引起的表面失效，提高工程应用的可靠性。通过系统的实验和材料表征，研究了改性氧化石墨烯（MGO）对离子液体（IL）--[C7 C1 im][NTf 2]）润滑性能的影响。为了增强GO在IL [C7 Clim][NTf 2]润滑剂中的分散体的稳定性，将1-丁基-3-（9-羧基壬基）咪唑溴化物（ILC 9-COOH）共价接枝到GO上，这产生ILC 9-COOH改性的氧化石墨烯（MGO）。将合成的MGO/IL润滑剂应用于不锈钢球与轴承钢板之间的滑动接触。测量的摩擦和磨损相对于MGO浓度和温度进行了分析。实验结果表明，MGO是IL [C7 C1 im][NTf 2]润滑油的有效减摩添加剂，且在较高温度下效果更为明显。从三维表面轮廓仪和扫描电子显微镜（SEM）测量的分析，它被发现，磨料类型的磨损是占主导地位的磨损表面。如果适当地控制MGO浓度，则MGO添加剂可以有益于降低在较高温度下的磨损。
Nanocarbon products and graphene derivatives are often applied to base lubricants as an additive to reduce contact-induced surface failures and improve the reliability of engineering applications. In this study, the effects of modified graphene oxide (MGO) on the lubricity of the ionic liquid (IL), 1-heptyl-3-methyl imidazolium bis[(trifluoromethane)sulfonyl]amide ([C7C1im][NTf2]), are investigated through systematic experiments and material characterizations. To enhance the stability of the dispersion of GO in the IL [C7C1im][NTf2] lubricant, 1-butyl-3-(9-carboxynonyl)imidazolium bromide (ILC9-COOH) is covalently grafted onto GO, which produces ILC9-COOH-modified graphene oxide (MGO). The synthesized MGO/IL lubricant is applied to the sliding contact between the stainless steel ball and the bearing steel plate. The measured friction and wear are analyzed with respect to the MGO concentration and temperature. The experimental results support that MGO is an effective additive to the IL [C7C1im][NTf2] lubricant in decreasing the friction, and its benefit is more obvious at the higher temperature. From the analysis of the 3D surface profilometer and scanning electron microscopy (SEM) measurements, it is found that the abrasive type of wear is dominant on the worn surface. If the MGO concentration is appropriately controlled, MGO additive can be beneficial in decreasing the wear at the higher temperature.