Impact of mixed surfactant composition on emulsion stability in saline environment: anionic and nonionic surfactants

Zheng, Yue; Caicedo-Casso, Eduard A.; Davis, Cole R.; Howarter, John A.; Erk, Kendra A.; Martínez, Carlos

doi:10.1080/01932691.2021.1999255

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…al showed that emulsions with SLES produced a larger volume percentage of smaller oil drops than with Triton X-100. They also observed significant flocculation for Triton X-100 emulsions and confirmed this result using the DLVO theory Figure b shows that with 500 ppm SLES, there is a higher number of drops or flocs with diameters < 10 μm dispersed in between larger flocs compared to the Triton X-100 sample in Figure a.…”

Section: Resultssupporting

confidence: 52%

“…They also observed significant flocculation for Triton X-100 emulsions and confirmed this result using the DLVO theory. 34 Figure 2b shows that with 500 ppm SLES, there is a higher number of drops or flocs with diameters < 10 μm dispersed in between larger flocs compared to the Triton X-100 sample in Figure 2a. Qualitatively this may indicate a higher degree of stability for the SLES emulsions compared to Triton X-100.…”

Section: Impact Of Electrostatic Charge On O/w Emulsionmentioning

confidence: 91%

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Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water

et al. 2023

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Oily wastewater in the bilge of ocean vessels (i.e., bilge water) makes oil removal difficult due to the generation of oil-in-water (O/W) emulsions. A ship’s motion can promote emulsification or coalescence, depending on the surfactant type and concentration. This study investigates the effects of motion on model bilge water O/W emulsions, which has yet to be published in the literature. Mineral oil, 0.42 M NaCl DI-water, and a nonionic surfactant (Triton X-100) or an anionic surfactant (sodium lauryl ether sulfate, SLES) served as a model bilge water emulsion. The stability was characterized under static and dynamic conditions via optical microscopy and light diffraction. Ship motion was mimicked using a three-dimensional rocker. Under static conditions, the surfactant-to-oil ratio (S/O) needed to stabilize the emulsions for up to 20 days was 0.2 for SLES and 0.1 for Triton X-100. During dynamic ageing at 12 rpm, the S/O to promote emulsification was 0.1 for SLES and 0.2 for Triton X-100. At 30 rpm, the S/O to promote emulsification was 0.02 for SLES and 0.1 for Triton X-100, suggesting a complex interplay between surfactant concentration and energy input. These results expand on existing knowledge of bilge water and potentially reducing ocean pollution.

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Section: Resultssupporting

confidence: 52%

Section: Impact Of Electrostatic Charge On O/w Emulsionmentioning

confidence: 91%

Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water

et al. 2023

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“…The dispersed phase content was estimated by fitting their turbidity values to the corresponding reference curve. This method has also been described in detail in previous studies from our group. , …”

Section: Methodsmentioning

confidence: 99%

“…This method has also been described in detail in previous studies from our group. 26,59 ■ RESULTS AND DISCUSSION Influence of Surfactant Ratio on Spontaneous Emulsification. For systems with two surfactants, HLD mix depends on the ratio of those surfactants.…”

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confidence: 99%

Spontaneous Emulsions: Adjusting Spontaneity and Phase Behavior by Hydrophilic–Lipophilic Difference-Guided Surfactant, Salt, and Oil Selection

et al. 2022

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Spontaneous emulsion behavior has been difficult to predict and could be influenced by many variables including salinity, temperature, and chemical composition of the oil and surfactant. In this work, the hydrophilic–lipophilic difference (HLD) framework was used to predict the formation of spontaneous emulsions using a mixture of Span-80 and SLES surfactants. The spontaneity and emulsion behavior of different systems were modeled by estimating the HLDmix. The influence of surfactant ratio, salinity, and oil type was investigated. Spontaneous emulsification could only be observed when the HLDmix was between −0.96 and 1.04. Within this range, a negative HLDmix resulted in a greater spontaneity to form o/w emulsion, and a w/o emulsion was more likely to form when the HLDmix was positive. When the HLDmix was close to 0 (between −0.22 and 0.56 in our systems), emulsions were formed in both the oil and aqueous phases with high spontaneity. A combined effect of ultralow interfacial tension, Span-80 micelle swelling, and interfacial turbulence due to Marangoni effects is likely the main mechanism of the spontaneous emulsification observed in this study. A synergistic reduction in interfacial tension was observed between Span-80 and SLES (<1 mN/m). When the HLD of the system was close to 0, a bicontinuous emulsion phase was formed at the oil–water interface. The bicontinuous emulsion broke-up over time due to the ultralow interfacial tension and interfacial turbulence, forming dispersed oil and water droplets. Results from this work provide a practical method to suggest what surfactant composition, salinity, and oil type could promote (or eliminate) the conditions favorable for spontaneous emulsification.

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Surface properties, aggregation behavior and wettability of the mixed system of fluorocarbon cationic surfactant and hydrocarbon anionic surfactant in dilute solutions

Zhang,

Peng,

Yang

et al. 2024

Journal of Molecular Liquids

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Impact of mixed surfactant composition on emulsion stability in saline environment: anionic and nonionic surfactants

Cited by 4 publications

References 49 publications

Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water

Effect of Dynamic Ageing on the Stability of Oil-in-Water Emulsions with Anionic and Nonionic Surfactants in High-Salinity Water

Spontaneous Emulsions: Adjusting Spontaneity and Phase Behavior by Hydrophilic–Lipophilic Difference-Guided Surfactant, Salt, and Oil Selection

Surface properties, aggregation behavior and wettability of the mixed system of fluorocarbon cationic surfactant and hydrocarbon anionic surfactant in dilute solutions

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