Ion Density Deviations in Semipermeable Ionic Microcapsules

Abstract

By implementing the nonlinear Poisson-Boltzmann theory in a cell model, we theoretically investigate the influence of polyelectrolye gel permeability on ion densities and pH deviations inside the cavities of ionic microcapsules. Our calculations show that variations in permeability of a charged capsule shell cause a redistribution of ion densities within the capsule, which ultimately affects the pH deviation and Donnan potential induced by the electric field of the shell. We find that semipermeable capsules can induce larger pH deviations inside their cavities that can permeable capsules. Furthermore, with increasing capsule charge, the influence of permeability on pH deviations progressively increases. Our theory, while providing a self-consistent method for modeling the influence of permeability on fundamental properties of ionic microgels, makes predictions of practical significance for the design of microcapsules loaded with fluorescent dyes, which can serve as biosensors for diagnostic purposes.

7 pages, 6 figures

References in corpus (3)

• Many-body interactions and melting of colloidal crystals
• Ion Density Deviations in Polyelectrolyte Microcapsules: Influence on Biosensors
• Interactions of neutral semipermeable shells in asymmetric electrolyte solutions

Cited by in corpus (4)

• Ratiometric Organic Fibers for Localized and Reversible Ion Sensing with Micrometer-Scale Spatial Resolution
• Osmotic Pressure and Swelling Behavior of Ionic Microcapsules
• Electrostatic Interactions and Electro-osmotic Properties of Semipermeable Surfaces
• Complex Self-Assembly from Simple Interaction Rules in Model Colloidal Mixtures