Charge regulation of colloidal particles in aqueous solutions

Abstract

We study charge regulation of colloidal particles inside aqueous electrolyte solutions. To stabilize colloidal suspension against precipitation, colloidal particles are synthesized with either acidic or basic groups on their surface. In contact with water these surface groups undergo proton transfer reaction, resulting in colloidal surface charge. The charge is determined by the condition of local chemical equilibrium between hydronium ions inside the solution and at the colloidal surface. We use a model of Baxter sticky spheres to explicitly calculate the equilibrium dissociation constants and to construct a theory which is able to quantitatively predict the effective charge of colloidal particles with either acidic or basic surface groups. The predictions of the theory for the model are found to be in excellent agreement with the results of Monte Carlo simulations. The theory is further extended to treat colloidal particles with a mixture of both acidic and basic surface groups.

References in corpus (26)

• Electrostatic correlations: from Plasma to Biology
• The Electrostatic Screening Length in Concentrated Electrolytes Increases with Concentration
• Dipolar Poisson-Boltzmann Equation: Ions and Dipoles Close to Charged Surfaces
• Scaling of dynamics with the range of interaction in short-range attractive colloids
• Competition of percolation and phase separation in a fluid of adhesive hard spheres
• A simple approach for charge renormalization of highly charged macro-ions
• Electrostatic Correlations and the Polyelectrolyte Self Energy
• Charge renormalization for effective interactions of colloids at water interfaces
• pH dependence of charge multipole moments in proteins
• Charge Regulation with Fixed and Mobile Charges
• Dielectric Constant of Ionic Solutions: Combined Effects of Correlations and Excluded Volume
• Charge regulation: a generalized boundary condition?
• Charge regulation and local dielectric function in planar polyelectrolyte brushes
• Simulations of Coulomb systems confined by polarizable surfaces using periodic Green functions
• Charge Regulation of Colloidal Particles: Theory and Simulations
• Interfacial solvation explains attraction between like-charged objects in aqueous solution
• Charge Regulating Macro-ions in Salt Solutions: Screening Properties and Electrostatic Interactions
• Donnan equilibrium and the osmotic pressure of charged colloidal lattices
• Spontaneous symmetry breaking of charge-regulated surfaces
• Anomalous Multipole Expansion: Charge Regulation of Patchy, Inhomogeneously Charged Spherical Particles
• Coupling between bulk- and surface chemistry in suspensions of charged colloids
• Charge regulation of nonpolar colloids
• Charge regulation radically modifies electrostatics in membrane stacks
• General theory of charge regulation within the Poisson-Boltzmann framework: study of a sticky-charged wall model
• Complex Fluids with Mobile Charge-Regulated Macro-Ions
• Role of metallic core for the stability of virus-like particles in strongly coupled electrostatics

Cited by in corpus (9)

• Accelerated simulation method for charge regulation effects
• Theory of Charge Regulation of Colloidal Particles in Electrolyte Solutions
• Brownian dynamics simulations of hard rods in external fields and with contact interactions
• Interaction between charge-regulated metal nanoparticles in an electrolyte solution
• Reactive Monte Carlo Simulations for Charge Regulation of Colloidal Particles
• Equilibrium conformations and surface charge regulation of spherical polymer brushes in stretched regimes
• Fast Brownian cluster dynamics
• Charge fluctuations in charge regulated systems: dependence on statistical ensemble
• Charge Regulation Effect on Nanoparticles Interaction Mediated by Polyelectrolyte