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Issue 16, 2014
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Frictional properties of a polycationic brush

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Abstract

The frictional behaviour of end-grafted poly[2-(dimethyl amino)ethyl methacrylate] films (brushes) has been shown by friction force microscopy to be a strong function of pH in aqueous solution. Data were acquired using bare silicon nitride and gold-coated tips, and gold coated probes that were functionalized by the deposition of self-assembled monolayers. At the extremes of pH (pH = 1, 2, and 12), the friction–load relationship was found to be linear, in agreement with Amontons' law of macroscopic friction. However, at intermediate pH values, the data were fitted by single asperity contact mechanics models; both Johnson–Kendall–Roberts (JKR) and Derjaguin–Muller–Toporov models were observed, with JKR behaviour fitting the data better at relatively neutral pH.

Graphical abstract: Frictional properties of a polycationic brush

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Publication details

The article was received on 27 Dec 2013, accepted on 14 Jan 2014 and first published on 16 Jan 2014


Article type: Paper
DOI: 10.1039/C3SM53201A
Citation: Soft Matter, 2014,10, 2759-2766
  • Open access: Creative Commons BY license
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    Frictional properties of a polycationic brush

    M. Raftari, Z. Zhang, S. R. Carter, G. J. Leggett and M. Geoghegan, Soft Matter, 2014, 10, 2759
    DOI: 10.1039/C3SM53201A

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