Extremes of Some Foam Properties and Elasticity of Thin Foam Films near the Critical Micelle Concentration

Русанов, А. И.; Krotov, V. V.; Nekrasov, A. G.

doi:10.1021/la0358623

Cited by 16 publications

(12 citation statements)

References 11 publications

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“…According to this figure, foam stability for nonionic LA-7 surfactant is much more than SDS. As known from literature 32 and as Figure 10 also shows, SDS surfactant solution has the most stable foam at 1 cmc; reducing the SDS concentration below and above the cmc results in the rapid reduction of foam stability; for LA-7 at 0.1 cmc, maximum foam stability is established; and for concentrations other than this point, stability reduces. Marangoni theory explains the higher foam stability at surfactant cmc regions.…”

Section: Resultssupporting

confidence: 60%

Experimental Investigation of Foam Flooding Using Anionic and Nonionic Surfactants: A Screening Scenario to Assess the Effects of Salinity and pH on Foam Stability and Foam Height

et al. 2022

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Gravity override and viscous fingering are inevitable in gas flooding for improving hydrocarbon production from petroleum reservoirs. Foam is used to regulate gas mobility and consequently improve sweep efficiency. In the enhanced oil recovery process, when the foam is introduced into the reservoir and exposed to the initial saline water saturation and pH condition, selection of the stable foam is crucial. Salinity and pH tolerance of generated foams are a unique concern in high salinity and pH variable reservoirs. NaOH and HCl are used for adjusting the pH, and NaCl and CaCl 2 are utilized to change salinity. Through analyzing these two factors along with surfactant concentration, we have instituted a screening scenario to optimize the effects of salinity, pH, surfactant type, and concentration to generate the most stable state of the generated foams. An anionic (sodium dodecyl sulfate) and a nonionic (lauric alcohol ethoxylate-7) surfactants were utilized to investigate the effects of the surfactant type. The results were applied in a 40 cm synthetic porous media fully saturated with distilled water to illustrate their effects on water recovery at ambient conditions. This most stable foam along with eight different stabilities and foamabilities and air alone was injected into the sand pack. The results show that in optimum surfactant concentration, the stability of LA-7 was not highly changed with salinity alteration. Also, we probed that serious effects on foam stability are due to divalent salt and CaCl 2 . Finally, we found the most water recovery that was obtained by the three most stable foams by the formula of 1 cmc SDS + 0.5 M NaCl, 1 cmc SDS + 0.01 M CaCl 2 , and LA-7@ pH ∼ 6 from porous media flooding. Total water recovery for the most stable foam increased by an amount of 65% compared to the state of air alone. A good correlation between foam stability and foamability at higher foam stabilities was observed.

show abstract

Section: Resultssupporting

confidence: 60%

Experimental Investigation of Foam Flooding Using Anionic and Nonionic Surfactants: A Screening Scenario to Assess the Effects of Salinity and pH on Foam Stability and Foam Height

et al. 2022

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“…The foaming properties of SL-esters and natural SLs with paraffin oil have not yet been reported. surfactant concentration is often attributed to a reduction in interfacial elasticity which reduces foam thin film stability [33]. Results in Figure 4(d) show that, regardless of SL-structure and concentration, the addition of 10% paraffin oil to solutions results in poor foam stabilization.…”

Section: Sophorolipid Ester Foamingmentioning

confidence: 99%

“…These studies have shown CMCs ranging from 20-130 mg/L and mSFT ranging from [32][33][34][35][36][37][38][39][40][41][42] mN/m [10][11][12][13]. Hirata et al studied the initial foaming performance of LSL [11].…”

Section: Introductionmentioning

confidence: 99%

Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

Koh

Gross

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Sophorolipids (SLs) are naturally produced glycolipid biosurfactants that offer safe alternatives to chemical surfactants that have been identified as ecologically-hazardous.Molecular editing of SLs by esterification of the lipid tail was used to prepare a family of SLesters whose hydrophobic moiety is extended from 18 carbons (17-HOC18:1Δ 9 ) to 20, 24, or 28 carbons, respectively. The interfacial properties of natural and SL-esters were evaluated with paraffin and a synthetic crude oil. SL-esters reduced paraffin oil/water interfacial tension (IFT) by 89-97% and had critical aggregation concentrations (CACs) between 0.02-0.008mg/mL. SLesters were also found to emulsify paraffin and synthetic crude oil with oil/surfactant ratios up to 200:1 wt/wt for 1 week with emulsion droplet sizes below 5μm. SL-hexyl ester had the lowest CAC, 0.008 mg/mL, and generally, the lowest droplet sizes, particularly at 10wt% paraffin oil.While, SL-decyl ester had the highest (97.2%) maximum %-IFT reduction and gave paraffin oil emulsions that were most stable over time. SL-ester emulsions of synthetic crude oil resulted in emulsion sizes that are similar to those with paraffin oil. However, the absence of SL-ester precipitation over the range of SL-ester/synthetic crude oil emulsions tested suggest that the affinity of SL-esters to the oil phase is enhanced by the presence of o-xylene and 1,2-dimethylcyclohexane in the crude oil formulation. A natural SL mixture consisting of 1:1 lactonic (LSL) and acidic (ASL) forms has a CAC that is about an order of magnitude larger than SL-esters. Furthermore, the natural SL mixture was unable to emulsify paraffin and synthetic oil when the ratio of oil-to-surfactant is greater than 1:1. The predictive connection between CAC and emulsion sizes is discussed. IFT and emulsion data show that SL-esters are promising surfactants for crude oil related oil compositions.

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“…The presence of micellar nanostructures has an impact on the properties and the stability of thin liquid films and on systems, which contain them as key ingredients (foams and emulsions) [16,17]. This aspect is closely related to the stability and lifetime of the existing micelles, as well as to the possible reorganization of micellar aggregates in the bulk of the film.…”

Section: Foam Films From Micellar Solutionsmentioning

confidence: 99%

Amphiphilic nanostructures in foam films

Mileva

Exerowa

2008

Current Opinion in Colloid & Interface Science

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Extremes of Some Foam Properties and Elasticity of Thin Foam Films near the Critical Micelle Concentration

Cited by 16 publications

References 11 publications

Experimental Investigation of Foam Flooding Using Anionic and Nonionic Surfactants: A Screening Scenario to Assess the Effects of Salinity and pH on Foam Stability and Foam Height

Experimental Investigation of Foam Flooding Using Anionic and Nonionic Surfactants: A Screening Scenario to Assess the Effects of Salinity and pH on Foam Stability and Foam Height

Molecular editing of sophorolipids by esterification of lipid moieties: Effects on interfacial properties at paraffin and synthetic crude oil-water interfaces

Amphiphilic nanostructures in foam films

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