Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-06-30
Europhysics Letters, VOL 51, pp. 461-467 (2000)
Physics
Condensed Matter
Soft Condensed Matter
published version
Scientific paper
10.1209/epl/i2000-00516-1
In this letter, we study the ground state of two spherical macroions of identical radius, but asymmetric bare charge ((Q_{A}>Q_{B})). Electroneutrality of the system is insured by the presence of the surrounding divalent counterions. Using Molecular Dynamics simulations within the framework of the primitive model, we show that the ground state of such a system consists of an overcharged and an undercharged colloid. For a given macroion separation the stability of these ionized-like states is a function of the difference ((\sqrt{N_{A}}-\sqrt{N_{B}})) of neutralizing counterions (N_{A}) and (N_{B}). Furthermore the degree of ionization, or equivalently, the degree of overcharging, is also governed by the distance separation of the macroions. The natural analogy with ionic bonding is briefly discussed.
Holm Christian
Kremer Kurt
Messina Rene
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