NDLI: Effect of salt on the compression of polyelectrolyte brushes in a theta solvent

Content Provider	Springer Nature Link
Author	Matsen, M. W.
Copyright Year	2012
Abstract	Classical strong-stretching theory (SST) predicts that, as opposing polyelectrolyte brushes are compressed together in a salt-free theta solvent, they contract so as to maintain a finite polymer-free gap, which offers a potential explanation for the ultra-low frictional forces observed in experiments despite the application of large normal forces. However, the SST ignores chain fluctuations, which would tend to close the gap resulting in physical contact and in turn significant friction. In a preceding study, we examined the effect of fluctuations using self-consistent field theory (SCFT) and illustrated that high normal forces can still be applied before the gap is destroyed. We now look at the effect of adding salt. It is found to reduce the long-range interaction between the brushes but has little effect on the short-range part, provided the concentration does not enter the salted-brush regime. Consequently, the maximum normal force between two planar brushes at the point of contact is remarkably unaffected by salt. For the crossed-cylinder geometry commonly used in experiments, however, there is a gradual reduction because in this case the long-range part of the interaction contributes to the maximum normal force.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	35
Issue Number	2
e-ISSN	1292895X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soft Matter: Polymers and Polyelectrolytes Soft and Granular Matter, Complex Fluids and Microfluidics Statistical Physics, Dynamical Systems and Complexity Nanotechnology Polymer Sciences Biophysics and Biological Physics Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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