Dynamic interfacial properties and tuning aqueous foamability stabilized by cationic surfactants in terms of their structural hydrophobicity, free drainage and bubble extent

Kumar, Vinod; Pal, Nilanjan; Jangir, Anil Kumar; Manyala, Dhana Lakshmi; Varade, Dharmesh; Kuperkar, Ketan

doi:10.1016/j.colsurfa.2019.124362

Cited by 38 publications

(16 citation statements)

References 49 publications

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“…Here, at low concentrations, CTAB molecules tend to adsorb at the air–water interface until they reach saturation at the surface, resulting in a sharp break point that is generally referred as the critical micelle concentration (CMC), above which the ST is almost constant. Here, the measured CMC value of CTAB in water (i.e., in the absence of PG) is in good agreement with the reported value. , However, with increasing [PG], the CMC as well as the γ decreases, which shows that PG promotes quicker micellization in CTAB. Such behavior could be attributed to the induced hydrophobicity of PG in CTAB.…”

Section: Results and Discussionsupporting

confidence: 91%

“…Here, the measured CMC value of CTAB in water (i.e., in the absence of PG) is in good agreement with the reported value. 18,53 However, with increasing [PG], the CMC as well as the γ decreases, which shows that PG promotes quicker micellization in CTAB. Such behavior could be attributed to the induced hydrophobicity of PG in CTAB.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Tuning Cationic Micelle Properties with an Antioxidant Additive: A Molecular Perspective

et al. 2021

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In this work, we characterize the micellization and morphology transition induced in aqueous cetyltrimethylammonium bromide (CTAB) solution by the addition of the antioxidant propyl gallate (PG) using tensiometry, rheology, and small-angle neutron scattering (SANS) techniques combined with the molecular dynamics (MD) simulation approach. The adsorption of CTAB at the air–water interface in the presence of varying [PG] revealed a progressive decrease in the critical micelle concentration (CMC), while the changes in different interfacial parameters indicated enhancement of the hydrophobicity induced by PG in the CTAB micellar system. The dynamic rheology behavior indicated an increase in the flow viscosity (η) as a function of [PG]. Moreover, the rheological components (storage modulus, G′, and loss modulus, G″) depicted the viscoelastic features. SANS measurements depicted the existence of ellipsoidal micelles with varying sizes and aggregation number (N agg) as a function of [PG] and temperature. Computational simulation performed using density functional theory (DFT) calculations and molecular dynamics (MD) provided an insight into the atomic composition of the examined system. The molecular electrostatic potential (MEP) analysis depicted a close proximity of CTAB, i.e., emphasized favorable interactions between the quaternary nitrogen of CTAB and the hydroxyl group of the PG monomer, further validated by the two-dimensional nuclear Overhauser enhancement spectroscopy (2D-NOESY), which showed the penetration of PG inside the CTAB micelles. In addition, various dynamic properties, viz., the radial distribution function (RDF), the radius of gyration (R g), and solvent-accessible surface area (SASA), showed a significant microstructural evolution of the ellipsoidal micelles in the examined CTAB–PG system, where the changes in the micellar morphology with a more elongated hydrophobic chain and the increased R g and SASA values indicated the notable intercalation of PG in the CTAB micelles.

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Section: Results and Discussionsupporting

confidence: 91%

Section: ■ Results and Discussionmentioning

confidence: 99%

Tuning Cationic Micelle Properties with an Antioxidant Additive: A Molecular Perspective

et al. 2021

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“…This shows that SDS had a higher Γ value or a lower Α s than TX‐100, which shows, consistent with previous studies, that the packing density at the air‐water interface decreases with increasing hydrophobic chain length. [ 40,41 ]…”

Section: Resultsmentioning

confidence: 99%

Formation and stability of oil‐laden foam: Effect of surfactant and hydrocarbon solvent

Lin

Huang

et al. 2021

Can J Chem Eng

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Oil‐laden (OL) foams could serve an important role in various processes, particularly in enhanced oil recovery; however, OL foams are less studied than aqueous foams. In this work, the formation and stability of OL foam, by either sodium dodecyl sulphate (SDS) or Triton X‐100 (TX‐100) in water‐pentane mixture, was evaluated. We first constructed a diagram of good and poor foaminess against pentane content in the mixture and aqueous surfactant concentration. It was shown that surfactant onset concentration for good foaming was increased with increasing pentane content. The result was fitted using a mathematical model that considers the surfactant dilution and adsorption effects by pentane. Foam height decay profiles were also monitored. Results indicated that SDS resulted in a more stable foam than TX‐100 at the same critical micelle concentration (CMC). Depending on surfactant concentration, OL foams exhibited strikingly different stability behaviours. Pentane acted as an anti‐foamer at surfactant concentrations at the CMC or lower. However, very high foam stability was displayed at high surfactant concentration (e.g., 3× CMC) and medium to high pentane contents; this is a result contradictory to the predication of entering, spreading, and bridging coefficients in the classic theory. The stable OL foams of this study could be attractive to potential foam applications.

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“…In real foam flooding process, however, foams are usually produced by coinjection of gas and surfactant solution into porous media (Hosseini-Nasab et al, 2018;Hussain et al, 2019;Lu et al, 2017;Xu et al, 2020). The bubbling method is, therefore, often used for producing foams for performance evaluation (Chen et al, 2019;Kumar et al, 2020;Manan, 2015). For comparison, the performances of the surfactant systems involved were also tested by the bubbling method here, with the total concentration set at 5 mM and the C 16 HSB molar fraction in binary mixtures at 0.2.…”

Section: Improving Foam Performances By Using Mixed Surfactantsmentioning

confidence: 99%

Synergistic Effects between Anionic and Sulfobetaine Surfactants for Stabilization of Foams Tolerant to Crude Oil in Foam Flooding

Liu

Cui

2021

J Surfact & Detergents

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In foam flooding, foams stabilized by conventional surfactants are usually unstable in contacting with crude oil, which behaves as a strong defoaming agent. In this article, synergistic effects between different surfactants were utilized to improve foam stability against crude oil. Targeted to reservoir conditions of Daqing crude oil field, China (45 C, salinity of 6778 mg L −1 , pH = 8-9), foams stabilized by typical anionic surfactants fatty alcohol polyoxyethylene ether sulfate (AES) and sodium dodecyl sulfate (SDS) show low composite foam index (200-500 L s) and low oil tolerance index (0.1-0.2). However, the foam stability can be significantly improved by mixing the anionic surfactant with a sulfobetaine surfactant, which behaves as a foam stabilizer increasing the half-life of foams, and those with longer alkyl chain behave better. As an example, by mixing AES and SDS with hexadecyl dimethyl hydroxypropyl sulfobetaine (C 16 HSB) at a molar fraction of 0.2 (referring to total surfactant, not including water), the maximum composite foaming index and oil tolerance index can be increased to 3000/5000 L s and 1.0/4.0, respectively, at a total concentration between 3 and 5 mM. The attractive interaction between the different surfactants in a mixed monolayer as reflected by the negative β s parameter is responsible for the enhancement of the foam stabilization, which resulted in lower interfacial tensions and therefore negative enter (E), spreading (S), and bridging (B) coefficients of the oil. The oil is then emulsified as tiny droplets dispersed in lamellae, giving very stable pseudoemulsion films inhibiting rupture of the bubble films. This made it possible to utilize typical conventional anionic surfactants as foaming agents in foam flooding.

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Dynamic interfacial properties and tuning aqueous foamability stabilized by cationic surfactants in terms of their structural hydrophobicity, free drainage and bubble extent

Cited by 38 publications

References 49 publications

Tuning Cationic Micelle Properties with an Antioxidant Additive: A Molecular Perspective

Tuning Cationic Micelle Properties with an Antioxidant Additive: A Molecular Perspective

Formation and stability of oil‐laden foam: Effect of surfactant and hydrocarbon solvent

Synergistic Effects between Anionic and Sulfobetaine Surfactants for Stabilization of Foams Tolerant to Crude Oil in Foam Flooding

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