Like likes like: counterion-mediated attraction in macroionic and colloidal interaction

Physical Chemistry Chemical Physics : PCCP
N Ise

Abstract

The colloidal and macroionic interaction is discussed within the mean-field approach. Bound pairs of latex particles are photographed at a low particle volume fraction of 10(-4). The effective pair-potential obtained therefrom has an attractive tail for highly charged samples, while no attraction is detected for a low-charge sample. This attraction also manifests itself in the reversible aggregation of polystyrene sulfonate or DNA double strands by multivalent counterions. It is furthermore found in intra-macroionic interaction, affecting the conformation of flexible macroions. The reason why the DLVO theory predicts only repulsion is discussed. The Fowler-Guggenheim-McQaurrie analysis of the Debye-Hückel theory indicates that electrostatic Helmholtz free energy F(el) is generally not equal to Gibbs free energy G(el). The difference (G(el)-F(el))/V (V: system volume) corresponds to the electrostatic osmotic pressure p(el), which increases with increasing charge number. This consideration hints that (G(el)-F(el)) might not be negligible for highly charged macroions and colloidal particles. On the other hand, the DLVO approach is based on the assumption of G(el) = F(el). Using a mean-field approach, Sogami showed that the pair-po...Continue Reading

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Citations

Dec 11, 2013·The Journal of Chemical Physics·Yu A BudkovN V Brilliantov
Mar 14, 2018·Scientific Reports·Naoya YamaguchiNobuyoshi Miyamoto
Apr 17, 2015·Chemistry : a European Journal·Shi-Chao WeiCheng-Yong Su
Nov 6, 2018·The Journal of Chemical Physics·N F BunkinS V Gudkov
Jan 1, 2018·The Journal of Chemical Physics·Alexandros Chremos, Jack F Douglas
Nov 21, 2013·Physical Chemistry Chemical Physics : PCCP·Yiing-Rei Chen, Chi-Lun Lee
Dec 10, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Chantel C TesterJillian F Banfield

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