Stability of a dispersion of particles covered by a charge-regulated membrane: effect of the sizes of charged species
Resource
Journal of Colloid and Interface Science 262 (1): 73-80
Journal
Journal of Colloid and Interface Science
Journal Volume
262
Journal Issue
1
Pages
73-80
Date Issued
2003
Date
2003
Author(s)
DOI
246246/2006111501275354
Abstract
The influence of the sizes of charged species on the stability of a colloidal dispersion is investigated theoretically. We consider the case
where a particle comprises a rigid core and an amphoteric, charge-regulated membrane layer, which simulates biocolloids and particles
covered by artificial membranes. A modified Poisson–Boltzmann equation, which takes the sizes of all the charged species into account,
is adopted to describe the electrical field. The effects of other key parameters such as electrolyte concentration, pH, and the valence of
counterions on the behavior of a dispersion are also examined. We show that the larger the effective size of the counterions, the greater the
stability ratio, which is consistent with experimental observations in the literature.
Subjects
Stability ratio
Charge-regulated surface
Amphoteric surface
Ionic sizes
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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