Frictional properties of thin chain alcohol films


Mugele, F. and Salmeron, M. (2001) Frictional properties of thin chain alcohol films. Journal of Chemical Physics, 114 (4). pp. 1831-1836. ISSN 0021-9606

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Abstract:We used the surface forces apparatus (SFA) to measure the viscosity and friction of confined films of octanol and undecanol as a function of film thickness. In contrast to structurally similar alkanes, the alcohols retain their bulk-like lubrication properties down to a thickness of only one (bi)layer. Only the self-assembled monolayers of alcohol molecules that form spontaneously on each mica surface display solid-like stick-slip motion upon shearing. During stick-slip motion, microscopic creep is found to precede macroscopic slip events at high loads. Apart from this creep process, we find a well-defined critical shear stress during stick-slip motion, which decreases weakly with increasing sliding speed.
Item Type:Article
Copyright:© 2001 American Institute of Physics
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