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Macroscale Superlubricity Achieved on the Hydrophobic Graphene Coating with Glycerol.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-10 , DOI: 10.1021/acsami.0c01515 Yanfei Liu 1 , Jinjin Li 1 , Xiangyu Ge 1 , Shuang Yi 1 , Hongdong Wang 1 , Yuhong Liu 1 , Jianbin Luo 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-10 , DOI: 10.1021/acsami.0c01515 Yanfei Liu 1 , Jinjin Li 1 , Xiangyu Ge 1 , Shuang Yi 1 , Hongdong Wang 1 , Yuhong Liu 1 , Jianbin Luo 1
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Introduction of graphene-family nanoflakes in liquid results in a reduction in friction and enhanced wear resistance. However, the high demand for dispersity and stability of the nanoflakes in liquid largely restricted the choice of graphene-family nanoflakes thus far. This study proposed a new strategy to overcome this limitation, involving the formation of a graphene coating with deposited graphene-family nanoflakes, followed by the lubrication of the coating with glycerol solution. Pristine graphene (PG), fluorinated graphene (FG), and graphene oxide (GO) nanoflakes were chosen to be deposited on the respective SiO2 substrates to form graphene coatings, and then an aqueous solution of glycerol was used as lubricant. The coefficient of friction (COF) and wear rate were reduced for all deposited coatings. However, the PG coating exhibited better lubrication and antiwear performance than FG and GO coatings. A robust superlubricity with COF of approximately 0.004 can be achieved by combining glycerol with the PG coating. The superlubricity mechanism was attributed to the formation of a tribofilm, mainly composed of graphene nanoflakes in the contact zone. The extremely low friction achieved on the hydrophobic graphene coating with liquid can aid in the development of a high-performing new lubrication system for industrial applications.
中文翻译：
甘油疏水性石墨烯涂层实现了宏观超润滑性。
在液体中引入石墨烯族纳米薄片可减少摩擦并提高耐磨性。然而，迄今为止，对纳米薄片在液体中的分散性和稳定性的高要求极大地限制了石墨烯族纳米薄片的选择。这项研究提出了一种克服这一局限性的新策略，包括形成具有沉积的石墨烯族纳米薄片的石墨烯涂层，然后用甘油溶液润滑该涂层。选择原始石墨烯（PG），氟化石墨烯（FG）和氧化石墨烯（GO）纳米片沉积在各自的SiO2基底上以形成石墨烯涂层，然后将甘油水溶液用作润滑剂。所有沉积涂层的摩擦系数（COF）和磨损率均降低。然而，PG涂层比FG和GO涂层具有更好的润滑和抗磨性能。通过将甘油与PG涂层结合，可以实现具有约0.004的COF的稳固超润滑性。超润滑机理归因于摩擦膜的形成，该摩擦膜主要由接触区内的石墨烯纳米薄片组成。在疏水性石墨烯液体涂层上实现的极低摩擦可帮助开发适用于工业应用的高性能新型润滑系统。
更新日期：2020-04-23
中文翻译：
甘油疏水性石墨烯涂层实现了宏观超润滑性。
在液体中引入石墨烯族纳米薄片可减少摩擦并提高耐磨性。然而，迄今为止，对纳米薄片在液体中的分散性和稳定性的高要求极大地限制了石墨烯族纳米薄片的选择。这项研究提出了一种克服这一局限性的新策略，包括形成具有沉积的石墨烯族纳米薄片的石墨烯涂层，然后用甘油溶液润滑该涂层。选择原始石墨烯（PG），氟化石墨烯（FG）和氧化石墨烯（GO）纳米片沉积在各自的SiO2基底上以形成石墨烯涂层，然后将甘油水溶液用作润滑剂。所有沉积涂层的摩擦系数（COF）和磨损率均降低。然而，PG涂层比FG和GO涂层具有更好的润滑和抗磨性能。通过将甘油与PG涂层结合，可以实现具有约0.004的COF的稳固超润滑性。超润滑机理归因于摩擦膜的形成，该摩擦膜主要由接触区内的石墨烯纳米薄片组成。在疏水性石墨烯液体涂层上实现的极低摩擦可帮助开发适用于工业应用的高性能新型润滑系统。
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