Effect of ionic sizes on the stability ratio of a dispersion of particles with a charge-regulated surface.
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.
Hsu
Jyh-Ping
JP
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617, Republic of China. jphsu@ccms.ntu.edu.tw
Huang
Shih-Wei
SW
Tseng
Shiojenn
S