Debye length in multivalent electrolyte solutions

Mika M. Kohonen; Marilyn E. Karaman; Richard M. Pashley

doi:10.1021/la991621c

Debye length in multivalent electrolyte solutions

Mika M. Kohonen, Marilyn E. Karaman, Richard M. Pashley

Research output: Contribution to journal › Article › peer-review

101 Citations (Scopus)

Abstract

We present the results of direct force measurements between charged surfaces in solutions of multivalent electrolytes (MgSO₄, K₄Fe(CN)₆, and Th(NO₃)₄). For surface separations greater than approximately 3 nm the measured forces between the surfaces agree, within experimental uncertainty, with the predictions of the Derjaguin-Landau-Verwey-Overbeek theory of colloidal interactions. In particular, we find that various proposed corrections to the electrostatic screening lengths in solutions of multivalent electrolytes are either invalid or beyond the limits of measurement by present techniques.

Original language	English
Pages (from-to)	5749-5753
Number of pages	5
Journal	Langmuir
Volume	16
Issue number	13
DOIs	https://doi.org/10.1021/la991621c
Publication status	Published - 27 Jun 2000

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N2 - We present the results of direct force measurements between charged surfaces in solutions of multivalent electrolytes (MgSO4, K4Fe(CN)6, and Th(NO3)4). For surface separations greater than approximately 3 nm the measured forces between the surfaces agree, within experimental uncertainty, with the predictions of the Derjaguin-Landau-Verwey-Overbeek theory of colloidal interactions. In particular, we find that various proposed corrections to the electrostatic screening lengths in solutions of multivalent electrolytes are either invalid or beyond the limits of measurement by present techniques.

AB - We present the results of direct force measurements between charged surfaces in solutions of multivalent electrolytes (MgSO4, K4Fe(CN)6, and Th(NO3)4). For surface separations greater than approximately 3 nm the measured forces between the surfaces agree, within experimental uncertainty, with the predictions of the Derjaguin-Landau-Verwey-Overbeek theory of colloidal interactions. In particular, we find that various proposed corrections to the electrostatic screening lengths in solutions of multivalent electrolytes are either invalid or beyond the limits of measurement by present techniques.

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Debye length in multivalent electrolyte solutions

Abstract

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