Thermodynamic Properties of a Simple Model of Like-Charged Attracting Rods |
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Authors: | Jürgen F Stilck Yan Levin Jeferson J Arenzon |
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Institution: | (1) Instituto de Física, Universidade Federal Fluminense, Av. Litorânea s/n, 24210-340 Niterói, Rio de Janeiro, Brazil;(2) Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil |
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Abstract: | We study the thermodynamic properties of a simple model for the possible mechanism of attraction between like charged rod-like polyions inside a polyelectrolyte solution. We consider two polyions in parallel planes, with Z charges each, in a solution containing multivalent counterion of valence . The model is solved exactly for Z13 for a general angle between the rods and supposing that n counterions are condensed onto each polyion. The free energy has two minima, one at =0 (parallel rods) and another at =/2 (perpendicular rods). The stability of the parallel and perpendicular configurations is analyzed. |
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Keywords: | polyelectrolytes DNA Manning condensation like-charge attraction |
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