Counterion-only electrical double layer: A constrained entropy approach
Date
2002
Authors
Briscoe, W.
Attard, P.J.
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Journal article
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Journal of Chemical Physics, 2002; 117(11):5452-5464
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<jats:p>A counterion-only double-layer theory is developed taking a constrained entropy maximization approach based on an isothermal thermodynamic system. The double-layer interaction free energy per unit area between two charged planar surfaces is obtained in a consistent manner for the boundary conditions of constant surface charge density and charge regulation. Once applied to the nonpolar medium, it reveals that the electrical double-layer repulsion is weak and long-ranged. Asymptotically, the interaction decays as a power law, in contrast with that in the presence of an ion reservoir which decays exponentially at large surface separation. The applicability of the counterion-only model for describing colloidal stability in nonpolar media is discussed.</jats:p>
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Copyright American Institute of Physics 2002