Flexible polyelectrolytes with monovalent salt

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• 作者：Paulo S. Kuhn and Marcia C. Barbosa
• 刊名：Physica A
• 出版年：2005
• 期刊代码：138_03784371
• 类别：et
• 出版时间：2005
• 卷：357
• 期：1
• 页码：142-149
• 文件大小：215 K

摘要

We present a model for describing flexible polyelectrolytes in a good solvent and in the presence of monovalent salt. The molecule composed by N monomers is characterized by the end-to-end distance R_e=b(Z-1)^γ and the number of associated counterions n. At high temperatures the polyelectrolyte behaves as a neutral polymer (γ=0.588). Decreasing the temperature, the macromolecule changes from this extended configuration (γ=0.588) to a stretched form (γ≈1). At even lower temperatures, above the Manning condensation threshold, the polyelectrolyte collapses (γ≈0.3). Our results show good agreement with simulations.