Potential of Mean Force and Underscreening of Polarizable Colloids in Concentrated Electrolytes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40534272.
- Also identified by DOI 10.1021/acs.nanolett.5c01541 and PMC identifier 12226989.
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Abstract
This study uses advanced numerical methods to estimate the mean force potential (PMF) between charged, polarizable colloidal particles in dense electrolytes. We observe that when the Debye screening length, λ<sub>D</sub>, is below the hydrated ion size, the PMF shows discernible oscillations of purely electrostatic origin as opposed to chemical affinity, in addition to the expected exponential decay prescribed by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Moreover, our findings suggest concentrated electrolytes are significantly less efficient at muting electrostatic interactions in electrostatically stabilized colloidal suspensions, potentially having significant implications for our understanding of colloidal stability and the forces that govern the behavior of concentrated charged soft matter systems beyond DLVO theory.