Surfactant mediated particle aggregation in nonpolar solvents, By Mojtaba Farrokhbin

Research

Title	Surfactant mediated particle aggregation in nonpolar solvents
Type	Article
Keywords	Surfactant, Aggregation, Dynamic Light Scattering, Surface Forces, Colloid
Journal	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
DOI	DOI https://doi.org/10.1039/C9CP01985E
Researchers	Mojtaba Farrokhbin (First researcher) , Biljana Stojimirovic (Second researcher) , Marco Galli (Third researcher) , Mohsen Khajeh Aminian (Fourth researcher) , Yannick Hallez (Fifth researcher) , Gregor Trefalt (Not in first six researchers)

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.