Charge distribution on annealed polyelectrolytes |
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Authors: | M Castelnovo P Sens J-F Joanny |
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Institution: | (1) Institut Charles Sadron (CNRS UPR 022), 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR |
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Abstract: | We investigate the equilibrium charge distribution along a single annealed polyelectrolyte chain under different conditions.
The coupling between the conformation of the chain and the local charge distribution is described for various solvent qualities
and salt concentration. In salt free solution, we find a slight charge depletion in the central part of the chain: the charges
accumulate at the ends. The effect is less important if salt is added to the solution since the charge inhomogeneity is localized
close to the chain ends over a distance of order of the Debye length. In the case of poor solvent conditions we find a different
charge per monomer in the beads and in the strings in the framework of the necklace model. This inhomogeneity leads to a charge
instability and a first order transition between spherical globules and elongated chains.
Received 19 March 1999 and Received in final form 2 August 1999 |
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Keywords: | PACS 61 25 Hq Macromolecular and polymer solutions polymer melts swelling - 36 20 Ey Conformation (statistics and dynamics) - 05 90 +m Other topics in statistical physics thermodynamics and nonlinear dynamical systems |
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