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Self-Assembled Monolayers for Nanotribology and Surface Protection

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Nanotribology and Nanomechanics II

Abstract

Reliability of various micro- and nanodevices requiring relative motion as well as magnetic storage devices requires the use of hydrophobic and lubricating films to minimize adhesion, stiction, friction, and wear. In various applications, surfaces need to be protected from exposure to the operating environment, and hydrophobic films are of interest. The surface films should be molecularly thick, well-organized, chemically bonded to the substrate, and insensitive to environment. Ordered molecular assemblies with high hydrophobicity can be engineered using chemical grafting of various polymer molecules with suitable functional head groups, spacer chains, and nonpolar surface terminal groups.

In this chapter, we focus on self-assembled monolayers (SAMs) with high hydrophobicity and good nanotribological properties. SAMs are produced by various organic precursors. We first present a primer to organic chemistry, followed by an overview of selected SAMs with various substrates, spacer chains, and terminal groups in the molecular chains and an overview of nanotribological properties of SAMs. The contact angle, adhesion, friction, and wear properties of SAMs having various spacer chains with different surface terminal and head groups (hexadecane thiol, biphenyl thiol, perfluoroalkylsilane, alkylsilane, perfluoroalkylphosphonate, and alkylphosphonate) on various substrates (Au, Si, and Al) are surveyed. Chemical degradation mechanisms and environmental effects are studied. Based on the contact angle and nanotribological properties of various SAM films by atomic force microscopy (AFM) it is found that perfluoroalkylsilane and perfluorophosphonate SAMs exhibit attractive hydrophobic and tribological properties.

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Authors and Affiliations

  1. Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics, W390 Scott Laboratory, The Ohio State University, 201 W. 19th Avenue, Columbus, OH, 43210–1142, USA

    Bharat Bhushan

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  1. Bharat Bhushan
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Correspondence to Bharat Bhushan .

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

    Bharat Bhushan

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© 2011 Springer-Verlag Berlin Heidelberg

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Bhushan, B. (2011). Self-Assembled Monolayers for Nanotribology and Surface Protection. In: Bhushan, B. (eds) Nanotribology and Nanomechanics II. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15263-4_18

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  • DOI: https://doi.org/10.1007/978-3-642-15263-4_18

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