Electrolytes at spherical dielectric interfaces

R.A. Curtis, L. Lue

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A variational theory is developed and applied to study the properties of dielectric spheres immersed in a symmetric electrolyte solution. In the limit that the radius of the sphere becomes much larger than the Debye screening length, the system reduces to that of a planar dielectric interface. For this case, the excess surface tension obtained by the variational theory reduces to the Onsager-Samaras [J. Chem. Phys. 2, 528 (1934)] limiting law at low electrolyte concentrations. As the radius of the dielectric sphere decreases, the excess surface tension also decreases. The implications of this work to protein-salt interactions and the salting out of proteins are discussed.
LanguageEnglish
Number of pages11
JournalJournal of Chemical Physics
Volume123
Issue number17
Early online date31 Oct 2005
DOIs
Publication statusPublished - 1 Nov 2005

Fingerprint

Electrolytes
electrolytes
Surface tension
interfacial tension
proteins
radii
Screening
Proteins
screening
Salts
salts
interactions

Keywords

  • proteins
  • molecular biophysics
  • electrolytes
  • bioelectric phenomena

Cite this

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Electrolytes at spherical dielectric interfaces. / Curtis, R.A.; Lue, L.

In: Journal of Chemical Physics, Vol. 123, No. 17, 01.11.2005.

Research output: Contribution to journalArticle

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AU - Curtis, R.A.

AU - Lue, L.

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N2 - A variational theory is developed and applied to study the properties of dielectric spheres immersed in a symmetric electrolyte solution. In the limit that the radius of the sphere becomes much larger than the Debye screening length, the system reduces to that of a planar dielectric interface. For this case, the excess surface tension obtained by the variational theory reduces to the Onsager-Samaras [J. Chem. Phys. 2, 528 (1934)] limiting law at low electrolyte concentrations. As the radius of the dielectric sphere decreases, the excess surface tension also decreases. The implications of this work to protein-salt interactions and the salting out of proteins are discussed.

AB - A variational theory is developed and applied to study the properties of dielectric spheres immersed in a symmetric electrolyte solution. In the limit that the radius of the sphere becomes much larger than the Debye screening length, the system reduces to that of a planar dielectric interface. For this case, the excess surface tension obtained by the variational theory reduces to the Onsager-Samaras [J. Chem. Phys. 2, 528 (1934)] limiting law at low electrolyte concentrations. As the radius of the dielectric sphere decreases, the excess surface tension also decreases. The implications of this work to protein-salt interactions and the salting out of proteins are discussed.

KW - proteins

KW - molecular biophysics

KW - electrolytes

KW - bioelectric phenomena

U2 - 10.1063/1.2102890

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VL - 123

JO - Journal of Chemical Physics

T2 - Journal of Chemical Physics

JF - Journal of Chemical Physics

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