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首页> 外文期刊>Journal of Colloid and Interface Science >Chemically functionalized graphene for lubricant applications: Microscopic and spectroscopic studies of contact interfaces to probe the role of graphene for enhanced tribo-performance
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Chemically functionalized graphene for lubricant applications: Microscopic and spectroscopic studies of contact interfaces to probe the role of graphene for enhanced tribo-performance

机译：用于润滑剂应用的化学官能化石墨烯：接触界面的微观和光谱研究探讨石墨烯的作用，以增强摩擦性能

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摘要

Shear-induced transfer of graphene on the contact interfaces was studied by microscopic and spectroscopic analyses of steel balls lubricated with chemically functionalized graphene-based mineral lube base oil (SN-150). The 3,5-di-tert-butyl-4-hydroxybenzaldehyde (DtBHBA) grafted-graphene (Gr-DtBHBA) was prepared by two-steps approach using graphene oxide as a precursor. Chemical and structural features of Gr-DtBHBA are probed by FTIR, XPS, Raman, TGA, and HRTEM analyses. The van der Waals interaction between the tertiary-butyl group in the Gr-DtBHBA and hydrocarbon chains of mineral lube base oil facilitates the dispersion of Gr-DtBHBA in the SN-150 lube base oil, which is very important for the optimized performance of Gr-DtBHBA as a lubricant additive. The minute dosing (0.2-0.8 mg mL(-1)) of the Gr-DtBHBA in the SN-150 lube base oil showed the significant reduction in the coefficient of friction (40%) and wear scar diameter (17%) under the rolling contact between steel balls. The microscopic and EDX analysis of the worn area suggested the role of Gr-DtBHBA nanosheets for enhanced tribo-performance of the SN-150 lube base oil. A detailed Raman study of the worn area of steel ball revealed the deposition of a graphene-based tribo thin film in the forms of irregular patches. The shear-induced deposition of graphene thin film on the contact interfaces reduced the friction and protected the tribo-surfaces against the wear. (C) 2017 Elsevier Inc. All rights reserved.
机译：通过使用化学官能化石墨烯基矿石基础油（SN-150）的微观和光谱分析，通过微观和光谱分析研究了剪切诱导的石墨烯对接触界面的转移。通过使用石墨烯氧化物作为前体，通过双步方法制备3,5-二叔丁基-4-羟基苯甲醛（DTBHBA）接枝 - 石墨烯（GR-DTBHBA）。 GR-DTBHBA的化学和结构特征是通过FTIR，XPS，拉曼，TGA和HRTEM分析探测。矿质润滑油基础油的叔丁基之间的范德华与矿石基础油的烃链之间的相互作用有助于GR-DTBHBA在SN-150润滑油基础油中的分散，这对于GR的优化性能非常重要-dtbhba作为润滑剂添加剂。 SN-150润滑油基础油中的微小剂量（0.2-0.8mg ml（-1））的GR-DTBHBA在摩擦系数（40％）和磨损疤痕直径（17％）下显着降低钢球之间的滚动接触。磨损区域的微观和EDX分析表明GR-DTBHBA纳米蛋白酶对SN-150润滑油基础油的增强摩擦性能的作用。对钢球破旧区域的详细拉曼研究显示了以不规则贴剂的形式沉积石墨烯的摩擦薄膜。剪切诱导的石墨烯薄膜在接触界面上沉积降低摩擦并保护摩擦表面抵抗磨损。 （c）2017年Elsevier Inc.保留所有权利。

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