Phase and sedimentation behavior of oil (octane) dispersions in the presence of model mineral aggregates
Document Type
Article
Date of Original Version
10-15-2014
Abstract
Adsorption of suspended particles to the interface of surfactant-dispersed oil droplets can alter emulsion phase and sedimentation behavior. This work examines the effects of model mineral aggregates (silica nanoparticle aggregates or SNAs) on the behavior of oil (octane)-water emulsions prepared using sodium bis(2-ethylhexyl) sulfosuccinate (DOSS). Experiments were conducted at different SNA hydrophobicities in deionized and synthetic seawater (SSW), and at 0.5. mM and 2.5. mM DOSS. SNAs were characterized by thermogravimetric analysis (TGA) and dynamic light scattering (DLS), and the emulsions were examined by optical and cryogenic scanning electron microscopy. In deionized water, oil-in-water emulsions were formed with DOSS and the SNAs did not adhere to the droplets or alter emulsion behavior. In SSW, water-in-oil emulsions were formed with DOSS and SNA-DOSS binding through cation bridging led to phase inversion to oil-in-water emulsions. Droplet oil-mineral aggregates (OMAs) were observed for hydrophilic SNAs, while hydrophobic SNAs yielded quickly sedimenting agglomerated OMAs.
Publication Title, e.g., Journal
Marine Pollution Bulletin
Volume
87
Issue
1
Citation/Publisher Attribution
Gupta, Anju, Maximilian Sender, Sarah Fields, and Geoffrey D. Bothun. "Phase and sedimentation behavior of oil (octane) dispersions in the presence of model mineral aggregates." Marine Pollution Bulletin 87, 1 (2014): 164-170. doi: 10.1016/j.marpolbul.2014.07.062.