Tunable water-based lubrication behavior of alkyl- and fluoroalkyl-silanes |
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Authors: | YuHong Liu PengXiao Liu YuQi Xiao |
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Affiliation: | Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China |
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Abstract: | 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. |
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Keywords: | water-based lubrication wettability self-assmebled molecular films |
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