Phase and sedimentation behavior of oil (octane) dispersions in the presence of model mineral aggregates

被引：5

作者：

Gupta, Anju ^{[1
]}

Sender, Maximilian ^{[2
]}

Fields, Sarah ^{[2
]}

Bothun, Geoffrey D. ^{[2
]}

机构：

[1] Texas A&M Int Univ, Dept Engn Math & Phys, Dept Biol & Chem, Laredo, TX 78401 USA

[2] Univ Rhode Isl, Dept Chem Engn, Kingston, RI 02881 USA

来源：

MARINE POLLUTION BULLETIN | 2014年 / 87卷 / 1-2期

关键词：

Oil-mineral aggregates; DOSS; AOT; Silica nanoparticles; Oil dispersion; IN-WATER EMULSIONS; BIODEGRADATION; ADSORPTION; STABILITY;

D O I：

10.1016/j.marpolbul.2014.07.062

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：164 / 170

页数：7

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