Boundary Lubrication of Oxide Surfaces by Poly(L-lysine)-g-poly(ethylene glycol) (PLL-g-PEG) in Aqueous Media (original) (raw)

Abstract

In this work, we have explored the application of poly(L-lysine)-_g_-poly(ethylene glycol) (PLL-_g_-PEG) as an additive to improve the lubricating properties of water for metal-oxide-based tribo-systems. The adsorption behavior of the polymer onto both silicon oxide and iron oxide has been characterized by optical waveguide lightmode spectroscopy (OWLS). Several tribological approaches, including ultra-thin-film interferometry, the mini traction machine (MTM), and pin-on-disk tribometry, have been employed to characterize the frictional properties of the oxide tribo-systems in various contact regimes. The polymer appears to form a protective layer on the tribological interface in aqueous buffer solution and improves both the load-carrying and boundary-layer-lubrication properties of water.

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Authors and Affiliations

  1. Laboratory for Surface Science and Technology, Department of Materials, ETH-Zürich, Sonneggstrasse 5, Zürich, CH-8092, Switzerland
    Seunghwan Lee, Markus Müller, Janos Vörös, Stéphanie Pasche, Susan M. De Paul, Marcus Textor & Nicholas D. Spencer
  2. Tribology Section, Department of Mechanical Engineering, Imperial College, London, SW7 2BX, U.K
    Monica Ratoi-Salagean & Hugh A. Spikes

Authors

  1. Seunghwan Lee
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  2. Markus Müller
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  3. Monica Ratoi-Salagean
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  4. Janos Vörös
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  5. Stéphanie Pasche
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  6. Susan M. De Paul
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  7. Hugh A. Spikes
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  8. Marcus Textor
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  9. Nicholas D. Spencer
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Correspondence toNicholas D. Spencer.

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Lee, S., Müller, M., Ratoi-Salagean, M. et al. Boundary Lubrication of Oxide Surfaces by Poly(L-lysine)-_g_-poly(ethylene glycol) (PLL-_g_-PEG) in Aqueous Media.Tribology Letters 15, 231–239 (2003). https://doi.org/10.1023/A:1024861119372

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