CO2/N2 switchable aqueous foam stabilized by SDS/C12A surfactants: Experimental and molecular simulation studies

Sun, Su-Qin; Zhang, Xiqiang; Feng, Shengxiang; Wang, Hongbing; Wang, Yan; Luo, Jia; Li, Chunling; Hu, Songqing

doi:10.1016/j.ces.2019.115218

Cited by 23 publications

(10 citation statements)

References 44 publications

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“…CO 2 foam flooding is always preferred because it can be used for geological storage of CO 2 , as well as EOR. , Under oil reservoir condition (high pressure and high temperature), CO 2 can dissolve in crude oil, which expands the volume and reduces the viscosity of the fluids. Hence, it is used to mobilize the residual oil in the pore structure. − CO 2 foam flooding technology has attracted worldwide attention in terms of research in laboratory and industrial development in oilfield within decades. ,− …”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

et al. 2020

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CO2 foam flooding technology can be used for geological storage of greenhouse gas CO2 while enhancing oil recovery. In this paper, we performed molecular dynamics simulations for the CO2 foam film systems stabilized with an anionic surfactant of sodium dodecyl sulfate (SDS). Compared to other factors of a foam system, interfacial tension was used as the primary indicator to evaluate the stability of the SDS foam film. The effects of the concentration of the SDS surfactant, temperature, and pressure on the interfacial tension were studied. Based on the calculated results, the stability of the CO2 foam film was discussed. It is found that under the high-concentration condition, SDS molecules can form a dense and thick molecular layer at the interface, blocking the contact of CO2 molecules and water molecules and reducing the interfacial tension. Consequently, the stability of the foam liquid film can be improved. Low temperature and high pressure lead to high density of the CO2 phase, which enables strong interactions between CO2 and the hydrophobic tails of SDS molecules. The interfacial structure thus formed can reduce the contact probability between CO2 and water molecules, generating lower interfacial tension. Therefore, high SDS concentration, low temperature, and high pressure are beneficial to the stability of the CO2 foam. We show that the adsorption of CO2 molecules at the interface, the interfacial thickness, and solvent accessible surface area of the surfactant to the CO2 phase are affected by the density of CO2 bulk phase, which are important interfacial properties affecting the CO2/water interfacial tension and the stability of the CO2 foam.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

et al. 2020

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“…Hu and co-workers developed CO 2 /N 2 dual stimuli-responsive foams by mixing two common surfactants ( N , N -dimethyl- N -dodecyl amine and sodium dodecyl sulfate), and investigated the stimuli-switching mechanism of the foams by means of both experiments and molecular dynamics simulations. This research further enhanced the understanding of the switchability mechanism of smart foams as well as provided possible solutions to overcome the defoaming/demulsification issues in practical applications …”

Section: Introductionmentioning

confidence: 85%

“…This research further enhanced the understanding of the switchability mechanism of smart foams as well as provided possible solutions to overcome the defoaming/ demulsification issues in practical applications. 9 Among many types of stimulations, photostimulation or light is taken as a clean and renewable external trigger, which has gained more focus of researchers owing to its easily adjustable parameters such as wavelength, intensity, or time (duration of exposure). 10−12 In this regard, various surfactants containing photoresponsive chromophores were synthesized and further utilized for the fabrication of photosensitive switchable foams.…”

Section: ■ Introductionmentioning

confidence: 99%

Preparation and Insights of Smart Foams with Phototunable Foamability Based on Azobenzene-Containing Surfactants

et al. 2020

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Smart foams with tunable foamability exhibit superb applications in many fields such as colloidal and interface science. Herein, we have synthesized an azobenzene-containing surfactant with excellent photoresponsiveness by a simple thiol-maleimide click reaction between thioglycolic acid and 4-(N-maleimide) azobenzene (MAB). The structure and the photoresponsive behavior of the novel surfactant are characterized. Depending on the solution concentration, the synthesized surfactant demonstrated various speeds for the trans/cis photoisomerization varying from 9 to 24 s for the given concentration range and excellent reversible photoisomerization cycling stability (more than 20 cycles) upon light irradiation. Based on these conformational switches, a series of phototriggered obvious surface properties (e.g., critical micelle concentration (CMC), surface tension (γ), and surface excess concentration (Γ)) changes of the surfactant are achieved. More specifically, the smart foam system with tunable foamability is realized. As-formed smart foams with rapid photocontrolled reversible foaming/defoaming transition and excellent cycling stability make them very attractive candidates for applications in wastewater treatment, green textile, oil extraction, and emulsification.

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“… Chen et al., 2014b ), pH value ( Fujii et al., 2005 ; Huang and Yang, 2015 ; Sarker et al., 2017 ; Tu and Lee, 2014 ; Yang et al., 2013 ), magnetic field (Y. Chen et al., 2014a ; Lam et al., 2011 ), redox chemistry ( Quesada et al., 2013 ), or CO 2 ( Chai et al., 2014 ; Chen et al., 2020 ; Guo and Zhang, 2019 ; Sun et al., 2019 ; Yuan et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al. ( Sun et al., 2019 ) prepared a new CO 2 -N 2 switchable surfactant by combining CO 2 -responsive surfactant C 12 A with conventional surfactant SDS. The foam produced by the SDS/C 12 A surfactant with CO 2 or N 2 as the trigger can be quickly switched between foaming and defoaming.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and stability of switchable CO2-responsive foaming coupled with nanoparticles

et al. 2022

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CO2/N2 switchable aqueous foam stabilized by SDS/C12A surfactants: Experimental and molecular simulation studies

Cited by 23 publications

References 44 publications

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

Preparation and Insights of Smart Foams with Phototunable Foamability Based on Azobenzene-Containing Surfactants

Synthesis and stability of switchable CO2-responsive foaming coupled with nanoparticles

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CO2/N2 switchable aqueous foam stabilized by SDS/C12A surfactants: Experimental and molecular simulation studies

Cited by 23 publications

References 44 publications

Molecular Dynamics Study on CO2 Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

Molecular Dynamics Study on CO2 Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

Preparation and Insights of Smart Foams with Phototunable Foamability Based on Azobenzene-Containing Surfactants

Synthesis and stability of switchable CO2-responsive foaming coupled with nanoparticles

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Product

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About

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension

Molecular Dynamics Study on CO₂ Foam Films with Sodium Dodecyl Sulfate: Effects of Surfactant Concentration, Temperature, and Pressure on the Interfacial Tension