Study of the Synergistic Effect of Sodium Dodecyl Sulfate and Betaine at the Air/Water and Oil/Water Interfaces
Received date: 2014-02-22
Online published: 2014-04-16
Supported by
Project supported by the National Natural Science Foundation of China (No. 21173134) and the National Major Science and Technology Project (No. 2008ZX05011).
In this paper, the molecular array behavior of anionic surfactant sodium dodecyl sulfate SDS and zwitterionic surfactant Betaine at the air/water and oil/water interfaces were investigated by molecular simulation approaches, which helped to understand the effects of temperature, salts and the proportion of components on the interfacial activity and foam stability of the mixed binary systems, especially how the multivalent inorganic cations influence the interfacial adsorption behavior of the surfactants and the synergistic effect. The oil/water interfacial tension was not only measured experimentally using TEXAS500 spinning drop interface tension meter, but also calculated theoretically using dissipative particle dynamic (DPD) method. Foam decay method was utilized to determine the foam stability. The array behavior of surfactant molecules at the air/water and oil/water interfaces was described by molecular dynamics (MD) simulation method. It was found that the oil/water interfacial activity of mixed binary system was significantly better than unitary system. The synergistic effect between SDS and Betaine was enhanced when there was Ca2+ or Mg2+ existed in the solution. The radial distribution function of head groups of surfactants around inorganic ions showed that there was very strong interaction between the Ca2+ or Mg2+ and the head groups of SDS and Betaine, which not only induced the increase of the maximum interfacial adsorption quantity of the surfactants, but also adjusted the array states of the surfactant molecules in the interface layer. When the proportion of components of SDS/Betaine binary system was 4:6, the oil/water interfacial activity and foam stability of the binary system both were very good with Ca2+ or Mg2+ existing, even use sea water as medium, which could be a good candidate system for foam system used under high salinity condition. The co-adsorption behavior of the surfactant molecules in the binary system at oil/water interface and the foam films was found to be similar. The simulation results agreed well with the experiment results. The knowledge about the microscopic character of the mixtures of surfactants at interfaces could provide useful guidance for the design and application of surfactants under the condition of high salinity, such as low tension foam flooding system used in offshore EOR.
Li Yaping , Lv Weiqin , Cao Xulong , Song Xinwang , Wang Qiwei , Li Ying . Study of the Synergistic Effect of Sodium Dodecyl Sulfate and Betaine at the Air/Water and Oil/Water Interfaces[J]. Acta Chimica Sinica, 2014 , 72(5) : 615 -623 . DOI: 10.6023/A14020124
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