Size-asymmetric primitive model at low temperature: description of ion pairing and location of the critical point
We argue that Bjerrum's approach to ion pairing is inappropriate for the size-asymmetric primitive model in the neighborhood of its critical point, and propose a new approach based on the Stillinger-Lovett pairing procedure. The new approach recursively scales up the ion size until linear appro...
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| Published in | Physical review letters Vol. 95; no. 23; p. 235701 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
02.12.2005
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| Online Access | Get more information |
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| Summary: | We argue that Bjerrum's approach to ion pairing is inappropriate for the size-asymmetric primitive model in the neighborhood of its critical point, and propose a new approach based on the Stillinger-Lovett pairing procedure. The new approach recursively scales up the ion size until linear approximations are suitable for analyzing such a model. To locate the critical point, a residual van der Waals interaction between pairs is added, with an energy cutoff adjusted to match the critical temperature of the restricted primitive model. The locations and downward trends of T(c) and rho(c) with asymmetry are found to compare favorably with simulations. |
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| ISSN: | 0031-9007 |
| DOI: | 10.1103/PhysRevLett.95.235701 |