Interplay of distinct modes of charge regulation on poly-acid ionization and conformation
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908498360532992 |
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| author | Ghosh, Souradeep Chowdhury, Aritra Tomares, Dylan T. Schuler, Benjamin Kundagrami, Arindam Pappu, Rohit V. |
| author_facet | Ghosh, Souradeep Chowdhury, Aritra Tomares, Dylan T. Schuler, Benjamin Kundagrami, Arindam Pappu, Rohit V. |
| contents | We adapt the Edwards-Muthukumar theoretical framework for a single polymer chain to investigate the interplay between proton binding and counterion condensation for poly-acids. We find that changes to pH enable non-monotonic transitions between anti- and conventional polyelectrolyte behaviors. In the former, the net charge and the overall dimensions increase with increasing salt concentration, while the converse is true for conventional polyelectrolytes. The polymeric nature and local solvent polarization drive significant pKa shifts when compared to the values of reference monoacids. These pKa shifts are enhanced in semi-flexible chains. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_07055 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interplay of distinct modes of charge regulation on poly-acid ionization and conformation Ghosh, Souradeep Chowdhury, Aritra Tomares, Dylan T. Schuler, Benjamin Kundagrami, Arindam Pappu, Rohit V. Soft Condensed Matter Statistical Mechanics We adapt the Edwards-Muthukumar theoretical framework for a single polymer chain to investigate the interplay between proton binding and counterion condensation for poly-acids. We find that changes to pH enable non-monotonic transitions between anti- and conventional polyelectrolyte behaviors. In the former, the net charge and the overall dimensions increase with increasing salt concentration, while the converse is true for conventional polyelectrolytes. The polymeric nature and local solvent polarization drive significant pKa shifts when compared to the values of reference monoacids. These pKa shifts are enhanced in semi-flexible chains. |
| title | Interplay of distinct modes of charge regulation on poly-acid ionization and conformation |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2508.07055 |