Ion distributions near a liquid-liquid interface.
Mean field theories of ion distributions, such as the Gouy-Chapman theory that describes the distribution near a charged planar surface, ignore the molecular-scale structure in the liquid solution. The predictions of the Gouy-Chapman theory vary substantially from our x-ray reflectivity measurements of the interface between two electrolyte solutions. Molecular dynamics simulations, which include the liquid structure, were used to calculate the potential of mean force on a single ion. We used this potential of mean force in a generalized Poisson-Boltzmann equation to predict the full ion distributions. These distributions agree with our measurements without any adjustable parameters.
Luo
Guangming
G
Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA.
Malkova
Sarka
S
Yoon
Jaesung
J
Schultz
David G
DG
Lin
Binhua
B
Meron
Mati
M
Benjamin
Ilan
I
Vanysek
Petr
P
Schlossman
Mark L
ML