Energetics of colloids: Do oppositely charged particles necessarily attract each other?

Nir Ben-Tal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The electrostatic free energy of two oppositely charged macroions, suspended in ionic solution is calculated for different distances between the macroions. This is done by using a lattice field theory formulation of the statistical mechanics of Coulomb gas particles of finite size interacting with a fixed charge distribution (J. Chem. Phys. 1995, 102, 4584). In many cases, it is found that, regardless of the size of the mobile ions, the minimum of the free energy is at a separation between the macroions corresponding to a noncontact configuration. Illustrative examples, which emphasize the source of the repulsion at near-touching configurations are presented and discussed.

Original languageEnglish
Pages (from-to)9642-9645
Number of pages4
JournalJournal of Physical Chemistry
Volume99
Issue number24
DOIs
StatePublished - 1995
Externally publishedYes

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