The Effect of Charge on Boundary Layer Lubrication Seminar
- Time:
- 16:00
- Date:
- 23 March 2012
- Venue:
- Building 27 Lecture room 2001
For more information regarding this seminar, please email Chris-Kriton Skylaris at c.skylaris@soton.ac.uk .
Event details
Dissipative particle dynamics simulations are performed on two interacting polyelectrolyte brushes in an athermal solvent. The standard DPD model is modified by the addition of the electrostatic interactions and by the use of bond repulsion to model chain entanglement. For adsorbed polyelectrolyte monolayers the effect of salt concentration on layer thickness is observed and the results compared with the predictions of scaling theory.
The structural properties of neutral and polyelectrolyte brushes under compression are calculated at fixed solvent chemical potential. The highly charged brushes can support a larger load compared to neutral brushes at the same layer separation. A direct calculation of the friction from the stress tensor for two sliding layers shows that the friction coefficient between the charged polyelectrolyte layers is significantly lower than that of neutral polymer brushes and these results are compared with the experimental studies from the surface forces apparatus.
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Speaker information
Professor Dominic Tildesley, Unilever. Professor Dominic Tildesley is the recipient of the Marlow Medal and the Tilden Lecture and Medal.