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Frictional properties of a polycationic brush

Lookup NU author(s): Professor Mark GeogheganORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


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. © 2014 the Partner Organisations.

Publication metadata

Author(s): Raftari M, Zhang Z, Carter SR, Leggett GJ, Geoghegan M

Publication type: Article

Publication status: Published

Journal: Soft Matter

Year: 2014

Volume: 10

Issue: 16

Pages: 2759-2766

Print publication date: 21/04/2014

Online publication date: 16/01/2014

Acceptance date: 14/01/2014

Date deposited: 19/12/2019

ISSN (print): 1744-683X

ISSN (electronic): 1744-6848

Publisher: Royal Society of Chemistry


DOI: 10.1039/c3sm53201a

PubMed id: 24668347


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