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Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials

Lee, S. ; Müller, M. ; Heeb, R. ; Zürcher, S. ; Tosatti, S. ; Heinrich, M. ; Amstad, F. ; Pechmann, S. ; Spencer, N.D.

In: Tribology Letters, 2006, vol. 24, no. 3, p. 217-223

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    Titre
    • Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials
    Auteur
    • Lee, S.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Müller, M.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Heeb, R.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Zürcher, S.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Tosatti, S.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Heinrich, M.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Amstad, F.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Pechmann, S.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Spencer, N.D.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Tribology Letters, 2006, vol. 24, no. 3, p. 217-223. Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:315415
    Summary
    We report on the self-healing behavior of a polyelectrolyte-based aqueous lubricant additive, poly(l-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG), during aqueous lubrication of an oxide-based tribosystem. Combined pin-on-disk tribometry and fluorescence microscopy experiments have shown that stable lubricating performance was enabled by means of rapid healing of the worn tribopair surface by polymers dissolved in the adjoining bulk lubricant. This rapid ‘self-healing' of PLL-g-PEG is attributed to electrostatic interactions between the polycationic poly(l-lysine) (PLL) backbone of the polymer and negatively charged oxide surface. In contrast, a similar healing effect was not readily achievable in the case of methoxy-poly(ethylene glycol)-trimethylsilylether (Sil-PEG), a lubricant additive that is covalently bonded to the surface prior to tribological stress