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Adsorption mechanism of asphaltenes and surfactants at oil-water interface: based on dissipative particle dynamics method.

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Title: Adsorption mechanism of asphaltenes and surfactants at oil-water interface: based on dissipative particle dynamics method.
Authors: Liu, Xiaoyan1 (AUTHOR), Liang, Chonghao1 (AUTHOR), Jiang, Hui2 (AUTHOR), Ma, Chuan1 (AUTHOR) mcnepu@nepu.edu.cn, Jia, Yongying1 (AUTHOR)
Source: Journal of Dispersion Science & Technology. 2025, Vol. 46 Issue 9, p1378-1388. 11p.
Subjects: Interface dynamics, Oil-water interfaces, Radial distribution function, Petroleum, Adsorption capacity, Interfacial tension
Abstract: The study of emulsion stabilization mechanisms is of great importance in the field of crude oil extraction, transportation and processing. In order to further investigate the roles of asphaltenes and surfactants in the emulsion stabilization process, the adsorption mechanisms of asphaltenes and surfactants at the oil-water interface were investigated using dissipative particle dynamics. The results show that: the asphaltene interfacial film gradually becomes thicker before the saturation adsorption of asphaltene molecules at the oil-water interface, and the interfacial tension decreases with the increase of the number of molecules until it reaches the equilibrium state; different surfactant molecules have different influences on the interface, and the calculations of the radial distribution function and the interfacial tension show that H2T4 molecules have a stronger effect than H4T4 at the oil-water interface and have stronger surface activity. H2T4 reaches saturation adsorption capacity faster than H4T4 and has higher interfacial efficiency. The asphaltene-surfactant composite system can stabilize the oil-water interface more effectively. Competitive and synergistic effects of asphaltene and surfactant in the process of interfacial adsorption. When the concentration of surfactant in the composite system is low, there is a synergistic effect between the two in the interfacial adsorption process; when the concentration of surfactant is high, there is a competitive effect between the two in the synergistic adsorption process. The surfactant H4T4 has both interfacial adsorption and self-aggregation in the competitive adsorption process. This paper provides ideas for exploring the kinematic laws of molecular behavior in the stabilization mechanism of crude oil emulsions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Dispersion Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Adsorption mechanism of asphaltenes and surfactants at oil-water interface: based on dissipative particle dynamics method.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Xiaoyan%22">Liu, Xiaoyan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liang%2C+Chonghao%22">Liang, Chonghao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Hui%22">Jiang, Hui</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ma%2C+Chuan%22">Ma, Chuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mcnepu@nepu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Jia%2C+Yongying%22">Jia, Yongying</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Dispersion+Science+%26+Technology%22">Journal of Dispersion Science & Technology</searchLink>. 2025, Vol. 46 Issue 9, p1378-1388. 11p.
– Name: Subject
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Interface+dynamics%22">Interface dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Oil-water+interfaces%22">Oil-water interfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Radial+distribution+function%22">Radial distribution function</searchLink><br /><searchLink fieldCode="DE" term="%22Petroleum%22">Petroleum</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+capacity%22">Adsorption capacity</searchLink><br /><searchLink fieldCode="DE" term="%22Interfacial+tension%22">Interfacial tension</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The study of emulsion stabilization mechanisms is of great importance in the field of crude oil extraction, transportation and processing. In order to further investigate the roles of asphaltenes and surfactants in the emulsion stabilization process, the adsorption mechanisms of asphaltenes and surfactants at the oil-water interface were investigated using dissipative particle dynamics. The results show that: the asphaltene interfacial film gradually becomes thicker before the saturation adsorption of asphaltene molecules at the oil-water interface, and the interfacial tension decreases with the increase of the number of molecules until it reaches the equilibrium state; different surfactant molecules have different influences on the interface, and the calculations of the radial distribution function and the interfacial tension show that H2T4 molecules have a stronger effect than H4T4 at the oil-water interface and have stronger surface activity. H2T4 reaches saturation adsorption capacity faster than H4T4 and has higher interfacial efficiency. The asphaltene-surfactant composite system can stabilize the oil-water interface more effectively. Competitive and synergistic effects of asphaltene and surfactant in the process of interfacial adsorption. When the concentration of surfactant in the composite system is low, there is a synergistic effect between the two in the interfacial adsorption process; when the concentration of surfactant is high, there is a competitive effect between the two in the synergistic adsorption process. The surfactant H4T4 has both interfacial adsorption and self-aggregation in the competitive adsorption process. This paper provides ideas for exploring the kinematic laws of molecular behavior in the stabilization mechanism of crude oil emulsions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Dispersion Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1080/01932691.2024.2327419
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 1378
    Subjects:
      – SubjectFull: Interface dynamics
        Type: general
      – SubjectFull: Oil-water interfaces
        Type: general
      – SubjectFull: Radial distribution function
        Type: general
      – SubjectFull: Petroleum
        Type: general
      – SubjectFull: Adsorption capacity
        Type: general
      – SubjectFull: Interfacial tension
        Type: general
    Titles:
      – TitleFull: Adsorption mechanism of asphaltenes and surfactants at oil-water interface: based on dissipative particle dynamics method.
        Type: main
  BibRelationships:
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          Name:
            NameFull: Liu, Xiaoyan
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            NameFull: Liang, Chonghao
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            NameFull: Jiang, Hui
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            NameFull: Ma, Chuan
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            NameFull: Jia, Yongying
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            – D: 01
              M: 08
              Text: 2025
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              Y: 2025
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              Value: 46
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