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Effects of Chain Length and Heat Treatment on the Nanotribology of Alkylsilane Monolayers Self-Assembled on a Rough Aluminum Surface

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Department of Mechanical Engineering, Indian Institute of Science, Bangalore - 560012, India, and Department of Chemistry, University of Oxford, Mansfield Rd., Oxford OX1 3TA, United Kingdom
Cite this: J. Phys. Chem. B 2005, 109, 49, 23405–23414
Publication Date (Web):November 17, 2005
https://doi.org/10.1021/jp054074e
Copyright © 2005 American Chemical Society
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    Abstract

    The conformational order of alkylsilane monolayers self-assembled on a rough aluminum surface is affected by the molecular chain length and the thermal history of the sample. These monolayers have been characterized by grazing angle FTIR spectroscopy. Tribological mechanisms were explored using initial molecular conformation order, sliding distance, normal load, and substrate compliance as experimental variables. Results indicate that the initial conformational disorder of the molecules determines the level of friction at the commencement of sliding. Adverse changes in dynamic friction and monolayer life during sliding are not thermally induced but are related to substrate roughness and local plasticity. Plastic deformation reduces the spatial density of the alkylsilane monolayer and is accentuated by an increase in the normal load.

    †

     Indian Institute of Science.

    ‡

     University of Oxford.

    *

     Corresponding author. Tel.:  +91-80-2293 2512, 2351. Fax:  +91-80-2360 0648. Email address:  [email protected].

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