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| 1 | Black phosphorus as a new lubricant显示文摘In recent years, a new 2D-layered material—black phosphorus(BP)—has been a rising star after the era of graphene owing to its high charge carrier mobility, tunable direct bandgap and unique in-plane anisotropic structure. With the development of the synthesis and modification methods of BP, its extensive applications, e.g., transistors, batteries and optoelectronics have emerged. In order to explore its full potential, research into the tribological properties of BP 2D-layered materials such as lubrication additives and fillers in self-lubricating composite materials would be not only of high scientific value but also of practical significance. In this work, recent advances on the friction and lubrication properties of BP nanosheets made by our group, including the micro-friction properties, the lubrication properties of BP nanosheets as water-based and oil-based lubrication additives, and the friction and wear of BP/PVDF composites will be presented. Finally, the future challenges and opportunities in the use of BP materials as lubricants will be discussed. | Wei WANG Guoxin XIE Jianbin LUO | 2018 | Friction2018，6，1： | 23 |
| 2 | Molecular behaviors in thin film lubrication——Part three: Superlubricity attained by polar and nonpolar molecules显示文摘In thin-film lubrication(TFL), generally, the viscosity of the lubricant and its coefficient of friction(Co F) increase. Finding a method to reduce the Co F in TFL is a significant challenge for tribologists. In the present work, we report a robust superlubricity attained by using polyalkylene glycols(PAGs, polar molecules) and poly-α-olefins(PAOs, nonpolar molecules) as lubricants on steel/steel friction pairs that have been pre-treated by wearing-in with polyethylene glycol aqueous solution(PEG(aq)). A steady superlubricity state with a Co F of 0.0045 for PAG100 and 0.006 for PAO6 could be maintained for at least 1 h. Various affecting factors, including the sliding velocity, normal load, and viscosity of the lubricants, were investigated. Element analysis proved that composite tribochemical layers were deposited on the worn region after the treatment with PEG(aq). These layers were formed by the tribochemical reactions between PEG and steel and composed of various substances including oxides, iron oxides, Fe OOH, and Fe(OH)3, which contributed to the superlubricity. In addition to the tribochemical layers, ordered layers and a fluid layer were formed by the PAGs and PAOs during the superlubricity periods. All the three types of layers contributed to the superlubricity, indicating that it was attained in the TFL regime. Accordingly, a mechanism was proposed for the superlubricity of the PAGs and PAOs in the TFL regime in this work. This study will increase the scientific understanding of the superlubricity in the TFL regime and reveal, in the future, the potential for designing superlubricity systems on steel surfaces for industrial applications. | Xiangyu GE Tobias HALMANS Jinjin LI Jianbin LUO | 2019 | Friction2019，7，6： | 11 |
| 3 | 绿色摩擦学的最新进展显示文摘绿色摩擦学是许多摩擦学工作者十分感兴趣的一个新领域。对绿色摩擦学领域最近几年的进展进行综述,主要内容包括节能、减排,超低摩擦和磨损,生态摩擦学材料与技术,清洁能源装备的摩擦学技术,学科体系;并展望其今后的发展。 | 张嗣伟 | 2016 | 润滑与密封2016，41，9： | 6 |
| 4 | Superlubricity achieved with two-dimensional nano-additives to liquid lubricants显示文摘The topic of superlubricity is attracting considerable interest around the world while humanity is facing an energy crisis.Since various liquid superlubricity systems can be commonly achieved on the macroscale in ambient conditions,it is considered an effective solution to reduce unnecessary energy and material losses.However,certain practical problems such as low load-bearing pressure,dependence on hydrogen ions,and relatively long running-in processes still limit its widespread application.Two-dimensional(2D)nano-additives with ultrathin longitudinal dimensions can lower the shear resistance between sliding solid surfaces,and thus further optimize the applied conditions.In this review,the latest studies on 2D nano-additives with a combination of various water-based lubricants in the state of superlubricity are reported,typically including black phosphorus(BP),graphene oxide(GO),and layered double hydroxide.During the sliding process,composite lubricants effectively improved the load capacity(up to 600 MPa),reduced wear,and accelerated the running-in period(within 1,000 s)of the liquid superlubricity system.Both macromechanical experiments and microscopic tests are conducted to precisely analyze various interactions at the interfaces of the nano-additives and solid surfaces.These interactions can be described as tribochemical reactions,physical protection,and adsorption enhancement,and improved wear resistance.This review provides better guidance for applying 2D nanomaterials in liquid superlubricity systems. | Hongdong WANG Yuhong LIU | 2020 | Friction2020，8，6： | 6 |
| 5 | 聚合物刷水润滑条件下水膜厚度和摩擦学行为的相关性研究显示文摘利用表面引发原子转移自由基聚合技术(SI-ARTP)在钢球和玻璃盘摩擦副表面分别接枝亲水性聚合物刷-聚甲基丙烯酸-3-磺酸丙酯钾盐(PSPMA),去离子水作为润滑剂,在球-盘式摩擦试验机和纳米级薄膜厚度测量装置上开展了其宏观摩擦学性能研究,探讨了流体动压效应介入下的聚合物刷水润滑机理.利用光干涉技术观察了低卷吸速度下(4 mm/s)接触区域水膜分布情况,发现滚道两侧水膜的形状由初始状态的圆形随着时间逐渐沿着卷吸方向分布,证实了聚合物刷通过不断捕获周围的水分子形成了1层稳定的水膜;通过控制卷吸速度从1 mm/s连续增加512 mm/s实现了润滑状态的转变,低卷吸速度时处于薄膜润滑状态,膜厚不依赖于速度且稳定在35 nm左右,接触区内有效水膜的建立归功于聚合物刷的水合效应;当速度大于32 mm/s时处于弹流润滑状态,膜厚的测量值高于等黏弹膜厚公式的预测值(2~12 nm)和水合效应促成的膜厚值(约35 nm)之和,这意味着在流体动压润滑作用下聚合物刷表现出了优异的润滑增强作用,是水合效应和流体动压效应协同作用的结果. | 李金鹏 杨淑燕 吴杨 栗心明 郭峰 周峰 | 2021 | 摩擦学学报2021，41，6： | 3 |
| 6 | Water-based superlubricity in vacuum显示文摘This study achieved water‐based superlubricity with the lubrication of H_3PO_4 solution in vacuum(highest vacuum degree <10–4 torr) for the first time by performing a pre‐running process in air before running in vacuum. The stable water‐based superlubricity was sustainable in vacuum(0.02 torr) for 14 h until the test was stopped by the user for non‐experimental factor. A further analysis suggested that the superlubricity may be attributed to the phosphoric acid–water network formed in air, which can efficiently lock water molecules in the liquid lubricating film even in vacuum owing to the strong hydrogen bond interaction. Such capability to lock water is strongly affected by the strength of hydrogen bond and environmental conditions. The realization of water‐based superlubricity with H_3PO_4 solution in vacuum can lead to its application in space environment. | Chen XIAO Jinjin LI Lei CHEN Chenhui ZHANG Ningning ZHOU Tao QING Linmao QIAN Jiyang ZHANG Jianbin LUO | 2019 | Friction2019，7，2： | 0 |
| 7 | Macroscale superlubricity achieved via hydroxylated hexagonal boron nitride nanosheets with ionic liquid at steel/steel interface显示文摘Macroscale superlubricity is a prospective strategy in modern tribology to dramatically reduce friction and wear of mechanical equipment;however,it is mainly studied for point-to-surface contact or special friction pairs in experiments.In this study,a robust macroscale superlubricity for point-to-point contact on a steel interface was achieved for the first time by using hydroxylated modified boron nitride nanosheets with proton-type ionic liquids(ILs)as additives in ethylene glycol aqueous(EG_(aq)).The detailed superlubricity process and mechanism were revealed by theoretical calculations and segmented experiments.The results indicate that hydration originating from hydrated ions can significantly reduce the shear stress of EG_(aq),which plays an essential role in achieving superlubricity.Moreover,the IL induces a tribochemical reaction to form a friction-protective film.Hydroxylated boron nitride nanosheets(HO-BNNs)function as a polishing and self-repairing agent to disperse the contact stress between friction pairs.Superlubricity involves the change in lubrication state from boundary lubrication to mixed lubrication.This finding can remarkably extend the application of superlubricity for point-to-point contact on steel surfaces for engineering applications. | Zhiwen ZHENG Xiaolong LIU Guowei HUANG Haijie CHEN Hongxiang YU Dapeng FENG Dan QIAO | 2022 | Friction2022，10，9： | 0 |
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