JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2015, Vol. 50 ›› Issue (11): 32-39.doi: 10.6040/j.issn.1671-9352.0.2014.586

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Study of the stability of the CO2 aqueous foam

LI Xiang-liang1, SUN Yan-ge2, LI Ying2   

  1. 1. Geological Scientific Research Institute, Shengli Oilfield, Dongying 257015, Shandong, China;;
    2. Key Lab for Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, Shandong, China
  • Received:2014-12-26 Revised:2015-06-27 Online:2015-11-20 Published:2015-12-09

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Abstract: The stability of carbon dioxide (CO2) water-based foam stablized by surfactants was detected. It was found that sodium dodecyl sulfate (SDS) have apparently better stabilization capacity for the CO2 foam. The molecular array behavior of CO2 and surfactant molecules in foam films was investigated by molecular dynamics simulation. A kind of bipolar-headed surfactant alkyl polyoxyethylene sulfate (AES) having the same alkyl chain and negative charged head group with SDS was investigated as a comparison system, to find out how the microcharacter and array behavior of molecules in the foam films determined by molecular interaction and CO2 effect the foam stability. It was found that the carbon dioxide could not only distribute in the tail chains of surfactant molecules in gas/water interface, but also have interactions with water molecules distributed near the head groups of surfactants, which resulted in two effects of aspect:one is the increase of the chance that carbon dioxide molecules penetrating through the foam film, which made the carbon dioxide foam instability, and the other is the increase of the hydrophobicity of surfactants, which induced the variation of the array behavior of surfactants. Fourier transform infrared (FT-IR) was used to detect the gas permeability of the foam film. The experimental results showed that the tail chains of SDS arranged closely and the amount of CO2 penetrating through the foam film was little, which was in favor of the nice foam stability. The experimental results agreed very well with the molecular simulation results.

Key words: carbon dioxide water-based foam, molecular array behavior, foam stability, FT-IR

CLC Number: 

  • O647
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