Journal
TRIBOLOGY LETTERS
Volume 66, Issue 1, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-017-0963-0
Keywords
Contact mechanics; Polymer films; Polyelectrolytes; Atomic force microscopy; Adhesion
Categories
Funding
- Engineering and Physical Sciences Research Council [EP/F039999/1, EP/I012060/1]
- EPSRC [EP/I012060/1, EP/F039999/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F039999/1, EP/I012060/1] Funding Source: researchfish
Ask authors/readers for more resources
The nanoscopic adhesive and frictional behaviour of end-grafted poly[2-(dimethyl amino) ethyl methacrylate] (PDMAEMA) films (brushes) in contact with gold-or PDMAEMA-coated atomic force microscope tips in potassium halide solutions with different concentrations up to 300 mM is a strong function of salt concentration. The conformation of the polymers in the brush layer is sensitive to salt concentration, which leads to large changes in adhesive forces and the contact mechanics at the tip-sample contact, with swollen brushes (which occur at low salt concentrations) yielding large areas of contact and friction-load plots that fit JKR behaviour, while collapsed brushes (which occur at high salt concentrations) yield sliding dominated by ploughing, with conformations in between fitting DMT mechanics. The relative effect of the different anions follows the Hofmeister series, with I(-)collapsing the brushes more than Br- and Cl- for the same salt concentration.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available