Related Experiment Video
Updated: Aug 25, 2026

Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
Published on: December 25, 2017
Effect of ionic sizes on the stability ratio of a dispersion of particles with a charge-regulated surface
Jyh-Ping Hsu1, Shih-Wei Huang, Shiojenn Tseng
1Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617, Republic of China. jphsu@ccms.ntu.edu.tw
Abstract:
The influence of the ionic sizes on the stability of a dispersion of particles, which have an amphoteric, charged-regulated surface, is discussed. A modified Poisson-Boltzmann equation, which takes into account the sizes of ionic species, is adopted to describe the electrical field. An extended DLVO theory, which takes into account the electrical, the van der Waals, and the hydration energies, is used to estimate the stability of a colloidal dispersion. The effects of the key parameters, including ionic strength, pH, and density of surface sites, on the behavior of problem under consideration are examined. The results obtained are qualitatively consistent with experimental findings in the literature.
Related Concept Videos
The Colloidal State
Colloidal precipitates
Ionic Strength: Effects on Chemical Equilibria
In this solution, the primary cation—the calcium...
Factors Affecting Activity Coefficient
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a decrease in the...
Precipitate Formation and Particle Size Control
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
Complexation Equilibria: Factors Influencing Stability of Complexes