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Inhomogeneous screening near a dielectric interface

Wang, Rui and Wang, Zhen-Gang (2016) Inhomogeneous screening near a dielectric interface. Journal of Chemical Physics, 144 (13). Art. No. 134902. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:20150812-091441877

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Abstract

Screening is one of the most important concepts in the study of charged systems. Near a dielectricinterface, the ion distribution in a salt solution can be highly nonuniform. Here, we develop a theory that self-consistently treats the inhomogeneous screening effects. At higher concentrations when the bulk Debye screening length is comparable to the Bjerrum length, the double layerstructure and interfacial properties are significantly affected by the inhomogeneous screening. In particular, the depletion zone is considerably wider than that predicted by the bulk screening approximation or the WKB approximation. The characteristic length of the depletion layer in this regime scales with the Bjerrum length, resulting in a linear increase of the negative adsorption of ions with concentration, in agreement with experiments. For asymmetric salts, inhomogeneous screening leads to enhanced charge separation and surface potential.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1505.07340arXivDiscussion Paper
http://dx.doi.org/10.1063/1.4945011DOIArticle
http://scitation.aip.org/content/aip/journal/jcp/144/13/10.1063/1.4945011PublisherArticle
ORCID:
AuthorORCID
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2016 AIP Publishing LLC. Received 18 November 2015; accepted 18 March 2016; published online 5 April 2016. Acknowledgment is made to the donors of the American Chemical Society Petroleum Research Fund for partial support of this research.
Funders:
Funding AgencyGrant Number
American Chemical Society Petroleum Research FundUNSPECIFIED
Record Number:CaltechAUTHORS:20150812-091441877
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150812-091441877
Official Citation:Inhomogeneous screening near the dielectric interface Wang, Rui and Wang, Zhen-Gang, The Journal of Chemical Physics, 144, 134902 (2016), DOI:http://dx.doi.org/10.1063/1.4945011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59440
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Aug 2015 16:33
Last Modified:18 Apr 2016 15:53

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