Microstructural characteristics of surfactant assembly into a gel-like mesophase for application as an oil spill dispersant

Owoseni, Olasehinde; Zhang, Yueheng; Omarova, Marzhana; Li, Xin; Lal, Jyotsana; McPherson, Gary L.; Raghavan, Srinivasa R.; Bose, Arijit; John, Vijay T.

doi:10.1016/j.jcis.2018.03.089

Title: Microstructural characteristics of surfactant assembly into a gel-like mesophase for application as an oil spill dispersant

Journal Article · Fri Apr 06 00:00:00 EDT 2018 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1016/j.jcis.2018.03.089· OSTI ID:1674952

Owoseni, Olasehinde ^[1]; Zhang, Yueheng ^[1]; Omarova, Marzhana ^[1]; Li, Xin ^[2]; Lal, Jyotsana ^[2]; McPherson, Gary L. ^[1]; Raghavan, Srinivasa R. ^[3]; Bose, Arijit ^[4];

^[1]

Tulane Univ., New Orleans, LA (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Univ. of Maryland, College Park, MD (United States)
Univ. of Rhode Island, Kingston, RI (United States)

Hypothesis: Polyoxyethylene (20) sorbitan monooleate (Tween 80) can be incorporated into the gel-like phase formed by L-α-phosphatidylcholine (PC) and dioctyl sulfosuccinate sodium salt (DOSS) for potential application as a gel-like dispersant for oil spill treatment. Such gel-like dispersants offer advantages over existing liquid dispersants for mitigating oil spill impacts. Experiments: Crude oil-in-saline water emulsions stabilized by the surfactant system were characterized by optical microscopy and turbidity measurements while interfacial tensions were measured by the spinning drop and pendant drop techniques. The microstructure of the gel-like surfactant mesophase was elucidated using small angle neutron scattering (SANS), cryo scanning electron microscopy (cryo-SEM), and ³¹P nuclear magnetic resonance (NMR) spectroscopy. Findings: The gel-like phase consisting of PC, DOSS and Tween 80 is positively buoyant on water and breaks down on contact with floating crude oil layers to release the surfactant components. The surfactant mixture effectively lowers the crude oil-saline water interfacial tension to the 10^-2 mN/m range, producing stable crude oil-in-saline water emulsions with an average droplet size of about 7.81 µm. Finally, analysis of SANS, cryo-SEM and NMR spectroscopy data reveals that the gel-like mesophase has a lamellar microstructure that transition from rolled lamellar sheets to onion-like, multilamellar structures with increasing Tween 80 content.

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Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012432

OSTI ID:: 1674952

Alternate ID(s):: OSTI ID: 1775876

Journal Information:: Journal of Colloid and Interface Science, Vol. 524; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (35)

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