Collapse of polyelectrolyte brushes: Scaling theory and simulations |
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Authors: | FS Csajka RR Netz C Seidel J-F Joanny |
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Institution: | Max-Planck-Institut für Kolloid- und Grenzfl?chenforschung, Am Mühlenberg, D-14476 Golm, Germany, DE Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR
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Abstract: | We investigate polyelectrolyte brushes using both scaling arguments and molecular dynamics simulations. As a main result,
we find a novel collapsed brush phase. In this phase, the height of the brush results from a competition between steric repulsion
between ions and monomers and an attractive force due to electrostatic correlations. As a result, the monomer density inside
the brush is independent of the grafting density and the polymerization index. For small ionic and monomer radii (or for large
Bjerrum length) the brush undergoes a first-order phase transition from the osmotic into the collapsed state.
Received 26 September 2000 |
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Keywords: | PACS 61 25 Hq Macromolecular and polymer solutions polymer melts swelling – 68 45 Ws Other nonelectronic properties – 61 20 Qg Structure of associated liquids: electrolytes molten salts etc |
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