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- W2040375569 abstract "The electrical potential for the case of two identical, planar parallel particles immersed in a salt-free medium, where the ionic species in the counterions come solely from those that dissociated from the surfaces, is evaluated. Analytical expressions for the electrical potential, the concentration of counterions, and the electrical energy are derived. We show that in a salt-free dispersion, if the separation distance between two particles is sufficiently far, the electrical repulsive force dominates, that is, the total energy is positive and does not have a secondary minimum, which is not the case for a dispersion where both coions and counterions are present. Also, the conditions used to calculate the critical coagulation concentration in the classic Derjaguin–Landau–Verwey–Overbeek theory become inappropriate and the Derjaguin approximation is inapplicable. We show that if the surface charge density exceeds ∼0.04C∕m2, the stability of a salt-free dispersion remains essentially the same. If the surface charge density is sufficiently high, the maximum separation distance between two particles below which coagulation occurs is in the ranges of [0,1nm] and [1,7nm] for the cases where the Hamaker constant is 10−20 and 10−19J, respectively." @default.
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- W2040375569 date "2008-03-14" @default.
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- W2040375569 title "The stability of a salt-free colloidal dispersion" @default.
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- W2040375569 doi "https://doi.org/10.1063/1.2888994" @default.
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