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Effects of Image Charges on Double Layer Structure and Forces

Wang, Rui and Wang, Zhen-Gang (2013) Effects of Image Charges on Double Layer Structure and Forces. In: 87th ACS Colloid and Surface Science Symposium, June 23-26, 2013, Riverside, CA.

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The study of the electrical double layer lies at the heart of soft matter physics and biophysics. Here, we address the effects of the image charges on the double layer structure and forces using a weak coupling theory. For electrolyte solutions between two neutral plates, we show that depletion of the salt ions by the image charge repulsion results in short-range attractive and long-range repulsive forces. If cations and anions are of different valency, the asymmetric depletion leads to the formation of an induced electrical double layer. In comparison to a 1:1 electrolyte solution, both the attractive and the repulsive parts of the interaction are stronger for the 2:1 electrolyte solution. For two charged plates, the competition between the surface charge and the image charge effect can give rise to like-charge attraction and charge inversion. These results are in stark contrast with predictions from the Poisson-Boltzmann theory.

Item Type:Conference or Workshop Item (Paper)
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Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2012 Regents of the University of California.
Record Number:CaltechAUTHORS:20130715-084014607
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39354
Deposited By: Tony Diaz
Deposited On:12 Aug 2013 21:21
Last Modified:03 Oct 2019 05:06

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