Tunable water-based lubrication behavior of alkyl-and fluoroalkyl-silanes  

作　　者：LIU YuHong LIU PengXiao XIAO YuQi 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Science Bulletin》2012年第15期1879-1885,共7页

基　　金：the National Natural Science Foundation of China(50805086,50730007);the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (51021064)

摘　　要：In this paper,we report the tribological properties of self-assembled molecular(SAM) films of fluoroalkylsilanes and non-fluoroalkylsilanes,with different chain-lengths,adsorbed on Si substrate surfaces by covalent bonds.The SAM films were characterized using a universal ball-disk experimental tester in aqueous solutions.The substrate surface was examined by X-ray photoelectron spectroscopy(XPS),and the SAM films adsorbed on the Si surfaces were inspected by contact angle measurements and XPS.Lubrication studies revealed that several kinds of fluoroalkylsilanes had similar friction coefficients;the small differences were attributed to the chain flexibility.In contrast,differences in the aqueous lubrication properties of SAM films of non-fluoroalkylsilanes were clearly identified.It is suggested that substitution with fluorine atoms and the surface affinities of fluoroalkylsilanes contributed to redistribution of surface changes,causing variations in lubrication behaviors.In this paper, we report the tribological properties of self-assembled molecular （SAM） films of fluoroalkylsilanes and non-fluoroalkylsilanes, with different chain-lengths, adsorbed on Si substrate surfaces by covalent bonds. The SAM films were characterized using a universal bail-disk experimental tester in aqueous solutions. The substrate surface was examined by X-ray photoelectron spectroscopy （XPS）, and the SAM films adsorbed on the Si surfaces were inspected by contact angle measurements and XPS. Lubrication studies revealed that several kinds of fluoroalkylsilanes had similar friction coefficients; the small differ- ences were attributed to the chain flexibility. In contrast, differences in the aqueous lubrication properties of SAM films of non-fluoroalkylsilanes were clearly identified. It is suggested that substitution with fluorine atoms and the surface affinities of fluoroaikylsilanes contributed to redistribution of surface changes, causing variations in lubrication behaviors.

关 键 词：润滑行为 氟烷基 硅烷 X-射线光电子能谱 衬底表面 氟代 水基 可调 

分 类 号：TH117.2[机械工程—机械设计及理论]