Polyelectrolyte multilayer formation: electrostatics and short-range interactions

Details Polyelectrolyte multilayer formation: electrostatics and short-range interactions Polyelectrolyte multilayer formation: electrostatics and short-range interactions

2005-09-06

arxiv.org/abs/cond-mat/0509157v2

Eur. Phys. J. E 19, 155-162 (2006)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 7 figures

Scientific paper

10.1140/epje/e2006-00018-3

We investigate the phenomenon of multilayer formation via layer-by-layer deposition of alternating charge polyelectrolytes. Using mean-field theory, we find that a strong short-range attraction between the two types of polymer chains is essential for the formation of multilayers. The dependence of the required short-range attraction on the polymer charge fraction and salt concentration is calculated. For weak short-range attraction between any two adjacent layers, the adsorbed amount (per added layer) decays as the distance from the surface increases, until the chains stop adsorbing altogether. For strong short-range attraction, the adsorbed amount per layer increases after an initial decrease, and finally it stabilizes in the form of a polyelectrolyte multilayer that can be repeated many times.

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