abstract

• In this paper, we present a Monte Carlo simulation study on the structure of the electrical double layer around a spherical colloid surrounded by a binary electrolyte composed of spherical and non-spherical ions. Results are provided for the radial distribution functions between the colloid and ions, the orientation correlations between the colloid and non-spherical particles, and the integrated charge. Work is reported mainly for non-spherical particles modeled as spherocylinders, although a particular comparison is made between spherocylindrical particles and dimers. For the conditions investigated here, spherocylinders and dimers produce essentially the same structural information. Additionally, it is shown that spherocylinders mostly orient tangentially to the colloid at its surface; this preferred orientation disappears for larger distances. We also evidence that, near the colloid, the integrated charge attenuates monotonically when the macroparticle is highly charged, whereas for intermediate and low charged states of the colloid, the integrated charge can display charge reversal, overcharging, or both, with magnitudes that are sensitive to the salt concentration and to the localization of charge inside the spherocylinders. © 2018 Author(s).

authors

• Chávez Páez Martín
• Chávez-Navarro M.A.
• González Tovar Enrique
• Hernández-Martínez L.F.

publication date

• 2018-01-01

funding provided via

• 182132, FC-2015-2-1155  Grant

published in

• Journal of Chemical Physics  Journal

keywords

• Colloids; Distribution functions; Electrolytes; Intelligent systems; Spheres; Asymmetric electrolytes; Binary electrolyte; Electrical double layers; Nonspherical particle; Preferred orientations; Radial distribution functions; Salt concentration; Structural information; Monte Carlo methods

Digital Object Identifier (DOI)

• 10.1063/1.5038797

PubMed ID

• 30384730

start page

end page

volume

• 149

issue

• 16