Effect of the Surface Charge Discretization (Mobile Charge) on Electric Double Layer
Date
2010-06-28
Authors
Mirfit Mahmoud Amleh
ميرفت محمود العملة
Journal Title
Journal ISSN
Volume Title
Publisher
Al-Quds University
Abstract
The structure of the electric double layer (EDL) in contact with discrete and
continuously charged sphere macroion surfaces is studied within the framework of
the primitive model through Monte Carlo simulations.
Mobile charge discretization models (point charges localized on the macroion surface
and finite-sized charges protruding into the solution) are considered together with the
case of uniform charge distribution (central). The distribution of counterions near a
macroion is determined using a spherical cell. The effect of discreteness is analyzed
in terms of radial distribution functions, charge density profiles, and potential
profiles. The effect of discretization, radius of the counterions and the presence of salt
on the potential of EDL and accumulated charges are also studied.
It is established that with protruding charges the counterions are less accumulated
near the macroion because the excluded volume effect dominating over the increased
correlation ability. But with point charges distributions, counterions become more
strongly accumulated to the macroion and the effect increases with counterion
valence. At low salt concentration, the macroion accumulated charge is reduced due
to multivalent counterion adsorption. At high salt concentrations, the macroions
become overcharged so that their apparent charge has the opposite sign to the
stoichiometric one. The character of charge distribution affects the EDL structure
near the macroion, whereas its effect is much weaker at larger distances.
Description
Keywords
Citation
Amleh، Mirfit Mahmoud. (2010). Effect of the Surface Charge Discretization (Mobile
Charge) on Electric Double Layer [رسالة ماجستير منشورة، جامعة القدس، فلسطين]. المستودع
الرقمي لجامعة القدس. https://arab-scholars.com/121999
Amleh، Mirfit Mahmoud. (2010). Effect of the Surface Charge Discretization (Mobile Charge) on Electric Double Layer [رسالة ماجستير منشورة، جامعة القدس، فلسطين]. المستودع الرقمي لجامعة القدس. https://arab-scholars.com/121999
Amleh، Mirfit Mahmoud. (2010). Effect of the Surface Charge Discretization (Mobile Charge) on Electric Double Layer [رسالة ماجستير منشورة، جامعة القدس، فلسطين]. المستودع الرقمي لجامعة القدس. https://arab-scholars.com/121999