2016/04/08 by Nataša Adžić, Natasa Adzic, Rudolf Podgornik
Chemistry · Medicine · Physics and Astronomy · #Coupling (piping) #Electrolyte #Electrostatics and Colloid Interactions #Ion #Ionic bonding #Renal function and acid-base balance #Salt (chemistry) #Spectroscopy and Quantum Chemical Studies #Titratable acid #cond-mat.soft #physics.bio-ph #physics.chem-ph
paper · pdf · doi:10.1063/1.4952980
13 pages, 7 figures, submitted to J. Chem. Phys
arxiv created 2016/04/08 · openalex publication_date 2016/06/01 · arxiv updated 2016/06/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a theoretical description of the effect of polyvalent ions on the interaction between titratable macroions. The model system consists of two point-like macroions with dissociable sites, immersed in an asymmetric ionic mixture of monovalent and polyvalent salts. We formulate a dressed ion strong coupling theory, based on the decomposition of the asymmetric ionic mixture into a weakly electrostatically coupled monovalent salt and into polyvalent ions that are strongly electrostatically coupled to the titratable macro-ions. The charge of the macroions is not considered as fixed, but is allowed to respond to local bathing solution parameters (electrostatic potential, pH of the solution, and salt concentration) through a simple charge regulation model. The approach presented, yielding an effective polyvalent-ion mediated interaction between charge-regulated macroions at various solution conditions, describes the strong coupling equivalent of the Kirkwood-Schumaker interaction.