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The screening length of charge-asymmetric electrolytes: A hypernetted chain calculation

Summary: The screening length of charge-asymmetric electrolytes: A hypernetted
chain calculation
Andrew McBride and Markus Kohonen
Department of Applied Mathematics, Research School of Physical Sciences and Engineering,
Australian National University, Canberra ACT 0200, Australia
Phil Attard
Ian Wark Research Institute, University of South Australia, The Levels, SA 5095, Australia
Received 25 February 1998; accepted 5 May 1998
The screening length of the charge-asymmetric electrolyte is calculated in the hypernetted chain
approximation. Results are presented for 1:1, 2:1, 3:1, and 4:1 electrolyte with concentrations
ranging from 10 5
to 1 M. A number of analytic approximations for the screening length are
compared to the hypernetted chain data. We find that the second moment approach of Attard Phys.
Rev. E 48, 3604 1993 gives good results for monovalent but not asymmetric electrolyte. A
nonlinear version of the second moment approach is found to give good results for asymmetric
electrolytes. We also find that the asymptotic formula of Mitchell and Ninham Chem. Phys. Lett.
53, 397 1978 , although giving a null result for monovalent electrolyte, is a satisfactory estimate
for asymmetric electrolytes. 1998 American Institute of Physics. S0021-9606 98 52030-2
The interaction of charged surfaces in electrolyte solu-


Source: Attard, Phil - School of Chemistry, University of Sydney


Collections: Chemistry