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- W3214926859 abstract "Understanding how the surfactant molecular structure affects foam stability is important in various applications, such as enhanced oil recovery, hydraulic fracturing, and soil remediation. In this study, we conduct a systematic series of experiments in a Hele-Shaw cell to assess and explain the effect of surfactants on the foaminess and foam stability in the absence and presence of oil and asphaltene aggregates. Four surfactants with different molecular weights were studied, incl. three anionic surfactants: sodium 1,5-bis[(1H,1H,2H,2H-perfluorohexyl)oxy]- 1,5-dioxopentane-2-sulfonate (FG4), C18H37SO4Na (LSES), and sodium dodecyl sulfate (SDS); and one cationic [CTAB, (C16H33NMe3)Br]. The higher electrostatic repulsion between the foam film surfaces for the anionic surfactants (FG4 > LSES > SDS) strongly influences the process of foam generation and stability when compared with cationic (CTAB). Furthermore, the foam experiments performed in the presence of oil revealed maximum long-term stability and minimum bubble coarsening for the partially fluorinated FG4 surfactant. The experiments in the presence of asphaltene-oil mixtures revealed that the latter have detrimental effect on foam stability, except for FG4. The foam experiments clearly show the significance of the subtle interactions between surfactant head-group charge, chain length and branching. The obtained results could be useful in designing appropriate surfactants for foam stabilization in various applications." @default.
- W3214926859 created "2021-12-06" @default.
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- W3214926859 date "2021-12-01" @default.
- W3214926859 modified "2023-09-24" @default.
- W3214926859 title "The role of surfactant structure and asphaltene aggregates on the generation and stability of foam in porous media" @default.
- W3214926859 hasPublicationYear "2021" @default.
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