Scaling perspectives of underscreening in concentrated electrolyte solutions

We present a scaling view of underscreening observed in salt solutions in the range of concentrations greater than about 1 M, in which the screening length increases with concentration. The system consists of hydrated clusters of positive and negative ions with a single unpaired ion as suggested by...

Full description

Saved in:
Bibliographic Details
Published in:Soft matter 2023-10, Vol.19 (41), p.797-7911
Main Authors: Safran, Samuel A, Pincus, Philip A
Format: Article
Language:English
Subjects:
Clusters
Dielectric constant
Ion concentration
Negative ions
Saline solutions
Scaling
Screening
Self-similarity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a scaling view of underscreening observed in salt solutions in the range of concentrations greater than about 1 M, in which the screening length increases with concentration. The system consists of hydrated clusters of positive and negative ions with a single unpaired ion as suggested by recent simulations. The environment of this ion is more hydrated than average which leads to a self-similar situation in which the size of this environment scales with the screening length. The prefactor involves the local dielectric constant and the cluster density. The scaling arguments as well as the cluster model lead to scaling of the screening length with the ion concentration, in agreement with observations. We present a scaling view of underscreening observed in salt solutions in the range of concentrations greater than about 1 M, in which the screening length increases with concentration.
ISSN:1744-683X
1744-6848
DOI:10.1039/d3sm01094e