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Dielectric boundary effects on the interaction between planar charged surfaces with counterions only

Authors :
Santos, Alexandre Pereira dos
Netz, Roland R.
Source :
Repositório Institucional da UFRGS, Universidade Federal do Rio Grande do Sul (UFRGS), instacron:UFRGS
Publication Year :
2018

Abstract

Using Monte Carlo simulations in conjunction with periodic Green’s function methods, we study the interaction between planar charged surfaces with point-like counterions only in the presence of dielectric boundaries. Based on the calculated pressure profiles, we derive phase diagrams featuring correlation-induced negative pressure and thus attraction between the plates for large coupling parameters, i.e., low temperature or high surface charge and high ion valency. The counterion density profiles for low-dielectric and high-dielectric (metallic) surfaces are very different from the idealized case of a homogeneous dielectric constant. By contrast, the phase diagrams including the critical point and the two-phase coexistence region are rather insensitive to the presence of dielectric boundary effects. The single-image approximation that has been used in simulations before is by comparison with the exact formalism shown to be very accurate for low-dielectric surfaces but not for metallic surfaces.

Details

Language :
English
Database :
OpenAIRE
Journal :
Repositório Institucional da UFRGS, Universidade Federal do Rio Grande do Sul (UFRGS), instacron:UFRGS
Accession number :
edsair.od......3056..5e8a7a871202a1a6414655c46558027a