Probing the nanofriction of non-halogenated phosphonium-based ionic liquid additives in glycol ether oil on titanium surface  

作　　者：Xiuhua QIU Linghong LU Zhenyu QU Jiongtao LIAO Qi FAN Faiz Ullah SHAH Wenling ZHANG Rong AN 

机构地区：[1]Herbert Gleiter Institute of Nanoscience,Department of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China [3]Chemistry of Interfaces,Lule?University of Technology,Lule?97187,Sweden [4]Department of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Friction》2022年第2期268-281,共14页摩擦（英文版）

基　　金：We are grateful to the support from Natural Science Foundation of Jiangsu Province(Grant No.BK20191289);the National Natural Science Foundation of China(Grant Nos.21838004,21606131,and 21676137);and the financial support from Instrument&EquipmentOpen Funding of Nanjing University of Science and Technology.The Swedish Foundation for Strategic Research(Grant No.EM16-0013)is also gratefully acknowledged for the financial support.

摘　　要：The nanofrictional behavior of non-halogentated phosphonium-based ionic liquids(ILs)mixed with diethylene glycol dibutyl ether in the molar ratios of 1:10 and 1:70 was investigated on the titanium(Ti)substrate using atomic force microscopy(AFM).A significant reduction is observed in the friction coefficientμfor the IL-oil mixtures with a higher IL concentration(1:10,μ~0.05),compared to that for the lower concentration 1:70(μ~0.1).AFM approaching force–distance curves and number density profiles for IL-oil mixtures with a higher concentration revealed that the IL preferred to accumulate at the surface forming IL-rich layered structures.The ordered IL-rich layers formed on the titanium surface facilitated the reduction of the nanoscale friction by preventing direct surface-to-surface contact.However,the ordered IL layers disappeared in the case of lower concentration,resulting in an incomplete boundary layers,because the ions were displaced by molecules of the oil during sliding and revealed to be less efficient in friction reduction.

关 键 词：ionic liquid nanofriction atomic force microscopy(AFM) ORDERING density 

分 类 号：TG146.23[一般工业技术—材料科学与工程]