Surfactant mediated particle aggregation in nonpolar solvents
Mojtaba Farrokhbin1, Biljana Stojimirović2, Marco Galli2
1Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland. gregor.trefalt@unige.ch and Department of Physics, Faculty of Sciences, Yazd University, Yazd 89195-741, Iran.
Abstract:
The aggregation behavior of particles in nonpolar media is studied with time-resolved light scattering. At low surfactant concentrations particles are weakly charged and suspensions are not stable. The suspensions become progressively more stable with increasing surfactant concentration as particles become more highly charged. At high concentrations the particles become neutralized and aggregation is again fast. The theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO) is able to predict the stability ratios quantitatively by using the experimentally measured surface charges, screening lengths and van der Waals forces.
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