title: Influence of the degree of ionization and molecular mass of weak polyelectrolytes on charging and stability behavior of oppositely charged colloidal particles.
abstract: Positively charged amidine latex particles are studied in the presence of poly(acrylic acid) (PAA) with different molecular masses under neutral and acidic conditions by electrophoresis and time-resolved dynamic light scattering. Under neutral conditions, where PAA is highly charged, the system is governed by the charge reversal induced by the quantitatively adsorbing polyelectrolyte and attractive patch-charge interactions. Under acidic conditions, where PAA is more weakly charged, the following two effects come into play. First, the lateral structure of the adsorbed layers becomes more homogeneous, which weakens the attractive patch-charge interactions. Second, polyelectrolyte adsorption is no longer quantitative and partitioning into the solution phase is observed, especially for PAA of low molecular mass.
authors.affiliation: Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland.
authors.forename: Amin
authors.initials: A
authors.lastname: Sadeghpour
authors.forename: Emek
authors.initials: E
authors.lastname: Seyrek
authors.forename: István
authors.initials: I
authors.lastname: Szilágyi
authors.forename: José
authors.initials: J
authors.lastname: Hierrezuelo
authors.forename: Michal
authors.initials: M
authors.lastname: Borkovec