title: Charging and aggregation of negatively charged colloidal latex particles in the presence of multivalent oligoamine cations.
abstract: Charging and aggregation of negatively charged carboxyl latex particles in the presence of positively charged linear oligoamines containing 1-6 amine groups were investigated by electrophoretic mobility and dynamic light scattering. The oligoamines of low valence resemble simple inert salts and destabilize the suspensions by screening their charge. The oligoamines of higher valence induce overcharging at low concentrations, whereby destabilization is triggered by charge neutralization. At higher concentrations, destabilization is also induced by screening. The onset of first fast aggregation regime scales with the inverse six power of the valence in agreement with the Schulze-Hardy rule. The aggregation rates can be relatively well described by the DLVO theory which indicates that the interactions are governed by van der Waals and electrostatic double layer forces.
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva, Switzerland. Electronic address: istvan.szilagyi@unige.ch.
authors.forename: Istvan
authors.initials: I
authors.lastname: Szilagyi
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
authors.forename: Anna
authors.initials: A
authors.lastname: Polomska
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
authors.forename: Damian
authors.initials: D
authors.lastname: Citherlet
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
authors.forename: Amin
authors.initials: A
authors.lastname: Sadeghpour
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
authors.forename: Michal
authors.initials: M
authors.lastname: Borkovec