title: Flocculation, deflocculation, and ions migration in latex suspensions.
abstract: We have studied the dynamics of the flocculation of poly(styrene-butadiene-acrylic acid) latex suspensions. These suspensions were flocculated by the addition of Ca2+ ions at high concentrations of latex particles. Using diffusing wave spectroscopy and dynamic single light scattering after dilution, we have observed--depending on the pH and on the Ca2+ concentration--several scenarios for flocculation including successive flocculation and deflocculation. This complex behavior reveals that the Ca2+ migration within the shell of the latex is slow in acidic solvent but fast in basic solvent.
authors.affiliation: Laboratoire de Dynamique des Fluides Complexes, Institut de Physique, 3, rue de l'Université 67084, Strasbourg, France. deniz.gunes@cit.kuleuven.ac.be
authors.forename: D Z
authors.initials: DZ
authors.lastname: Gunes
authors.forename: J P
authors.initials: JP
authors.lastname: Munch
authors.forename: M
authors.initials: M
authors.lastname: Dorget
authors.forename: A
authors.initials: A
authors.lastname: Knaebel
authors.forename: F
authors.initials: F
authors.lastname: Lequeux