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Self-Assembled Monolayers (SAMs) for Controlling Adhesion, Friction, and Wear

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Nanotribology and Nanomechanics

Abstract

Making micro- and nanodevices as well as magnetic storage devices reliable necessitates the use of protective hydrophobic lubricating films that can minimize the adhesion, friction, and wear of sliding surfaces. Because of the small clearances associated with these devices, such films need to be very thin (on the order of a few molecules thick). Chemically-bonded low surface tension liquid films are suitable for this purpose, as are a select number of hydrophobic solid films. Highly hydrophobic ordered molecular assemblies can also be used; these are engineered by chemically grafting various polymer molecules with suitable functional head groups, spacer chains and nonpolar surface terminal groups to the surface involved. In this chapter, we focus on the use of self-assembled monolayers (SAMs) for high hydrophobicity and/or low adhesion, friction and wear applications. SAMs are produced by various organic precursors, so the chapter starts with a primer for the organic chemistry associated with this field. This is followed by an overview of selected SAMs with various spacer chains and terminal groups in their molecular chains on a variety of substrates, and a summary of the tribological properties of SAMs. The adhesion, friction and wear properties of SAMs with various spacer chains and surface terminal and head groups (hexadecane thiol, biphenyl thiol, alkylsilane, perfluoroalkylsilane and alkylphosphonate) on various substrates (Au, Si, and Al) are then surveyed. Degradation mechanisms and environmental effects are studied. Nanotribological studies of various SAM films by atomic force microscopy (AFM), show that perfluoroalkylsilane SAMs in particular exhibit attractive hydrophobic and tribological properties.

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  1. Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB2), Ohio State University, 201W. 19th Avenue, 43210-1142, Columbus, Ohio, USA

    Bharat Bhushan

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Bhushan, B. (2008). Self-Assembled Monolayers (SAMs) for Controlling Adhesion, Friction, and Wear. In: Nanotribology and Nanomechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-77608-6_17

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