Ionization properties of interfaces and linear polyelectrolytes: a discrete charge Ising model

Michal Borkovec, John Daicic and Ger J.M. Koper

Physica A: Statistical Mechanics and its Applications, 2001, vol. 298, issue 1, 1-23

Abstract: The proton binding characteristics of ionizable interfaces and linear polyelectrolytes are different. While ionizable interfaces protonate in a single broad protonation step, linear polyelectrolytes often show distinct two-step protonation behavior. We explain this phenomenon on the basis of a discrete charge Ising model. The interaction energies between two sites are derived by considering two point charges in a dielectric medium in contact with an electrolyte solution. A semi-infinite dielectric is used to model the planar interface, while a dielectric cylinder mimics the linear polyelectrolyte. For the plane, the inter-charge potential is stronger and much more long ranged than for the cylinder. This results in a mean-field like behavior for the planar system, while for the cylinder the interactions are short ranged and the system behaves in a non-mean-field like fashion. The model is in semi-quantitative agreement with experimental data for fatty-acid monolayers, water–oxide interfaces, and various linear polyelectrolytes.

Keywords: Ising model; Polymer solutions; Chemical equilibria (search for similar items in EconPapers)
Date: 2001
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0378437101002072
Full text for ScienceDirect subscribers only. Journal offers the option of making the article available online on Science direct for a fee of $3,000

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:298:y:2001:i:1:p:1-23

DOI: 10.1016/S0378-4371(01)00207-2

Access Statistics for this article

Physica A: Statistical Mechanics and its Applications is currently edited by K. A. Dawson, J. O. Indekeu, H.E. Stanley and C. Tsallis

More articles in Physica A: Statistical Mechanics and its Applications from Elsevier
Bibliographic data for series maintained by Catherine Liu ().