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Synthetic Kilogram Carbon Dots for Superior Friction Reduction and Antiwear Additives
Langmuir ( IF 3.7 ) Pub Date : 2022-06-10 , DOI: 10.1021/acs.langmuir.2c00852 Yiping Zhang 1 , Xiaohua Jia 1 , Qiao Tian 1 , Jin Yang 1 , Sizhe Wang 1 , Yong Li 1 , Dan Shao 1 , Lei Feng 1 , Haojie Song 1
Langmuir ( IF 3.7 ) Pub Date : 2022-06-10 , DOI: 10.1021/acs.langmuir.2c00852 Yiping Zhang 1 , Xiaohua Jia 1 , Qiao Tian 1 , Jin Yang 1 , Sizhe Wang 1 , Yong Li 1 , Dan Shao 1 , Lei Feng 1 , Haojie Song 1
Affiliation
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Because of the high synthesis cost, strong chemical inertness, complex process, and easy to endanger environment of traditional carbon-based nanolubricant additives, the development of its application in lubrication is limited. Therefore, a new type of lubricant additive with low cost, high yield, high performance, and environmental protection is urgently needed. Herein, a kilogram-scale carbon dots (CDs) lubricant additive was prepared by a simple and green one-step reaction of aldol condensation, which showed excellent lubricating properties in water and sunflower oil. The tribological properties of the CDs lubricant additive at different concentrations, loads, and speeds were systematically studied. The results show that the average friction coefficient of water is significantly reduced by 75% by a CDs lubricant additive. In particular, CDs not only exhibited excellent service life and lubrication stability during friction but also kept the friction coefficient change rate of sunflower seed oil close to 0 within 500 min. According to the tribological evaluation and wear surface analysis, the lubrication mechanism of CDs was attributed to their own morphological characteristics and abundant oxygen-containing functional groups on the surface. In the friction process, the charge adsorption effect, the adsorption protective film, and the hydrogen bonding layer are generated, which play an essential role in obvious antiwear and friction reduction. Therefore, this work provides a reference for the preparation of high-performance and high-yield lubricant additives.
中文翻译：
用于卓越减摩和抗磨添加剂的合成千克碳点
传统碳基纳米润滑油添加剂由于合成成本高、化学惰性强、工艺复杂、易危害环境等问题，限制了其在润滑领域的应用发展。因此，迫切需要一种低成本、高收率、高性能、环保的新型润滑油添加剂。在此，通过简单且绿色的羟醛缩合一步反应制备了千克级碳点 (CDs) 润滑油添加剂，该添加剂在水和葵花油中表现出优异的润滑性能。系统研究了不同浓度、载荷和速度下 CDs 润滑油添加剂的摩擦学性能。结果表明，CDs 润滑剂添加剂可显着降低水的平均摩擦系数 75%。尤其是，CD不仅在摩擦过程中表现出优异的使用寿命和润滑稳定性，而且在500分钟内保持葵花籽油的摩擦系数变化率接近0。根据摩擦学评价和磨损表面分析，CDs的润滑机理归因于其自身的形态特征和表面丰富的含氧官能团。在摩擦过程中，会产生电荷吸附作用、吸附保护膜和氢键层，对明显的抗磨减摩起到至关重要的作用。因此，该工作为高性能、高收率的润滑油添加剂的制备提供了参考。
更新日期：2022-06-10
中文翻译：
用于卓越减摩和抗磨添加剂的合成千克碳点
传统碳基纳米润滑油添加剂由于合成成本高、化学惰性强、工艺复杂、易危害环境等问题，限制了其在润滑领域的应用发展。因此，迫切需要一种低成本、高收率、高性能、环保的新型润滑油添加剂。在此，通过简单且绿色的羟醛缩合一步反应制备了千克级碳点 (CDs) 润滑油添加剂，该添加剂在水和葵花油中表现出优异的润滑性能。系统研究了不同浓度、载荷和速度下 CDs 润滑油添加剂的摩擦学性能。结果表明，CDs 润滑剂添加剂可显着降低水的平均摩擦系数 75%。尤其是，CD不仅在摩擦过程中表现出优异的使用寿命和润滑稳定性，而且在500分钟内保持葵花籽油的摩擦系数变化率接近0。根据摩擦学评价和磨损表面分析，CDs的润滑机理归因于其自身的形态特征和表面丰富的含氧官能团。在摩擦过程中，会产生电荷吸附作用、吸附保护膜和氢键层，对明显的抗磨减摩起到至关重要的作用。因此，该工作为高性能、高收率的润滑油添加剂的制备提供了参考。
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