The ionic composition and pair correlations in fluid phases of realistically salt-free charged colloidal sphere suspensions are calculated in the primitive model. We obtain the number densities of all ionic species in suspension, including low-molecular weight microions, and colloidal macroions with acidic surface groups, from a self-consistent solution of a coupled physicochemical set of nonlinear algebraic equations and non-mean-field liquid integral equations. Here, we study suspensions of colloidal spheres with sulfonate or silanol surface groups, suspended in demineralized water that is saturated with carbon dioxide under standard atmosphere. The only input required for our theoretical scheme are the acidic dissociation constants pKa, and effective sphere diameters of all involved ions. Our method allows for an ab initio calculation of colloidal bare and effective charges, at high numerical efficiency.
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28 March 2014
Research Article|
March 27 2014
Coupling between bulk- and surface chemistry in suspensions of charged colloids
M. Heinen;
M. Heinen
a)
1Institut für Theoretische Physik II, Weiche Materie,
Heinrich-Heine-Universität Düsseldorf
, 40225 Düsseldorf, Germany
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T. Palberg;
T. Palberg
2Institut für Physik,
Johannes Gutenberg Universität Mainz
, 55128 Mainz, Germany
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H. Löwen
H. Löwen
1Institut für Theoretische Physik II, Weiche Materie,
Heinrich-Heine-Universität Düsseldorf
, 40225 Düsseldorf, Germany
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J. Chem. Phys. 140, 124904 (2014)
Article history
Received:
October 28 2013
Accepted:
March 12 2014
Citation
M. Heinen, T. Palberg, H. Löwen; Coupling between bulk- and surface chemistry in suspensions of charged colloids. J. Chem. Phys. 28 March 2014; 140 (12): 124904. https://doi.org/10.1063/1.4869338
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