Lu Han , Huoxin Luan , Jia Ren , Qun Zhang , Chongjun Xu , Gen Li , Hongyan Xiao , Zhaohui Zhou , Lei Zhang , Lu Zhang
{"title":"双链阴离子表面活性剂对甜菜碱溶液动态界面张力的影响","authors":"Lu Han , Huoxin Luan , Jia Ren , Qun Zhang , Chongjun Xu , Gen Li , Hongyan Xiao , Zhaohui Zhou , Lei Zhang , Lu Zhang","doi":"10.1016/j.molliq.2023.121866","DOIUrl":null,"url":null,"abstract":"<div><p>To clarify the effect of the anionic surfactant with double alkyl chains on the interfacial tension (IFT) of betaine solutions, the IFT values of the sodium dialkyl sulfosuccinates (AOT) mixed with different betaines (alkyl sulphobetaine (ASB) and benzyl substituted alkyl sulphobetaine (BSB)) against n-alkanes and crude oil were detected by the spinning drop method. Additionally, molecular dynamics (MD) simulation was employed to verify the interaction mechanism between AOT and different betaine molecules. The results demonstrate that AOT molecules reach hydrophilic-lipophilic balance and form a relatively compacted interfacial film at the dodecane-water interface. Owing to the flexible double alkyl chains, AOT molecules possess a robust self-regulating ability at the oil–water interface. It is the self-regulating ability of AOT molecules and the electrostatic attraction between betaines and AOT molecules that achieve superior synergistic effects between AOT and betaine molecules with different molecular sizes. Besides, mixed adsorption and hydrophilic-lipophilic balance (HLB) reduce the IFT values of mixed systems containing AOT and different betaines effectively. The equilibrium IFT of the AOT-ASB system and the AOT-BSB system can be reduced to ultralow vales of 5.7 × 10<sup>−3</sup> mN/m and 8.2 × 10<sup>−3</sup> mN/m, respectively. At the crude oil–water interface, active components in crude oil compete with AOT molecules, which results in a significant increase in IFT values for AOT solution alone. Despite the different molecular sizes of ASB and BSB molecules, the flexible double alkyl chains of AOT molecules enable AOT to have synergistic effects with both ASB and BSB molecules at crude oil–water interface. Ultralow IFTs against crude oil can be obtained at optimized ratio of AOT to betaines, which is meaningful for the application of mixed solutions containing betaines and anionic surfactants in enhanced oil recovery.</p></div>","PeriodicalId":371,"journal":{"name":"Journal of Molecular Liquids","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of double chain anionic surfactant on the dynamic interfacial tensions of betaine solutions\",\"authors\":\"Lu Han , Huoxin Luan , Jia Ren , Qun Zhang , Chongjun Xu , Gen Li , Hongyan Xiao , Zhaohui Zhou , Lei Zhang , Lu Zhang\",\"doi\":\"10.1016/j.molliq.2023.121866\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>To clarify the effect of the anionic surfactant with double alkyl chains on the interfacial tension (IFT) of betaine solutions, the IFT values of the sodium dialkyl sulfosuccinates (AOT) mixed with different betaines (alkyl sulphobetaine (ASB) and benzyl substituted alkyl sulphobetaine (BSB)) against n-alkanes and crude oil were detected by the spinning drop method. Additionally, molecular dynamics (MD) simulation was employed to verify the interaction mechanism between AOT and different betaine molecules. The results demonstrate that AOT molecules reach hydrophilic-lipophilic balance and form a relatively compacted interfacial film at the dodecane-water interface. Owing to the flexible double alkyl chains, AOT molecules possess a robust self-regulating ability at the oil–water interface. It is the self-regulating ability of AOT molecules and the electrostatic attraction between betaines and AOT molecules that achieve superior synergistic effects between AOT and betaine molecules with different molecular sizes. Besides, mixed adsorption and hydrophilic-lipophilic balance (HLB) reduce the IFT values of mixed systems containing AOT and different betaines effectively. The equilibrium IFT of the AOT-ASB system and the AOT-BSB system can be reduced to ultralow vales of 5.7 × 10<sup>−3</sup> mN/m and 8.2 × 10<sup>−3</sup> mN/m, respectively. At the crude oil–water interface, active components in crude oil compete with AOT molecules, which results in a significant increase in IFT values for AOT solution alone. Despite the different molecular sizes of ASB and BSB molecules, the flexible double alkyl chains of AOT molecules enable AOT to have synergistic effects with both ASB and BSB molecules at crude oil–water interface. Ultralow IFTs against crude oil can be obtained at optimized ratio of AOT to betaines, which is meaningful for the application of mixed solutions containing betaines and anionic surfactants in enhanced oil recovery.</p></div>\",\"PeriodicalId\":371,\"journal\":{\"name\":\"Journal of Molecular Liquids\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2023-07-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Molecular Liquids\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0167732223006694\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Molecular Liquids","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167732223006694","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effect of double chain anionic surfactant on the dynamic interfacial tensions of betaine solutions
To clarify the effect of the anionic surfactant with double alkyl chains on the interfacial tension (IFT) of betaine solutions, the IFT values of the sodium dialkyl sulfosuccinates (AOT) mixed with different betaines (alkyl sulphobetaine (ASB) and benzyl substituted alkyl sulphobetaine (BSB)) against n-alkanes and crude oil were detected by the spinning drop method. Additionally, molecular dynamics (MD) simulation was employed to verify the interaction mechanism between AOT and different betaine molecules. The results demonstrate that AOT molecules reach hydrophilic-lipophilic balance and form a relatively compacted interfacial film at the dodecane-water interface. Owing to the flexible double alkyl chains, AOT molecules possess a robust self-regulating ability at the oil–water interface. It is the self-regulating ability of AOT molecules and the electrostatic attraction between betaines and AOT molecules that achieve superior synergistic effects between AOT and betaine molecules with different molecular sizes. Besides, mixed adsorption and hydrophilic-lipophilic balance (HLB) reduce the IFT values of mixed systems containing AOT and different betaines effectively. The equilibrium IFT of the AOT-ASB system and the AOT-BSB system can be reduced to ultralow vales of 5.7 × 10−3 mN/m and 8.2 × 10−3 mN/m, respectively. At the crude oil–water interface, active components in crude oil compete with AOT molecules, which results in a significant increase in IFT values for AOT solution alone. Despite the different molecular sizes of ASB and BSB molecules, the flexible double alkyl chains of AOT molecules enable AOT to have synergistic effects with both ASB and BSB molecules at crude oil–water interface. Ultralow IFTs against crude oil can be obtained at optimized ratio of AOT to betaines, which is meaningful for the application of mixed solutions containing betaines and anionic surfactants in enhanced oil recovery.
期刊介绍:
The journal includes papers in the following areas:
– Simple organic liquids and mixtures
– Ionic liquids
– Surfactant solutions (including micelles and vesicles) and liquid interfaces
– Colloidal solutions and nanoparticles
– Thermotropic and lyotropic liquid crystals
– Ferrofluids
– Water, aqueous solutions and other hydrogen-bonded liquids
– Lubricants, polymer solutions and melts
– Molten metals and salts
– Phase transitions and critical phenomena in liquids and confined fluids
– Self assembly in complex liquids.– Biomolecules in solution
The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include:
– Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.)
– Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.)
– Light scattering (Rayleigh, Brillouin, PCS, etc.)
– Dielectric relaxation
– X-ray and neutron scattering and diffraction.
Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.