Journal
THERMAL SCIENCE AND ENGINEERING PROGRESS
Volume 38, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tsep.2022.101628
Keywords
Gemini; Fluorocarbon surfactant; Hydrocarbon surfactant; Surface tension; Foaming performance; Foam stability
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This study systematically investigated the surface activity and foam performance of mixed solutions of short-chain fluorocarbon Gemini surfactant (Gemini) with anionic, zwitterionic, and non-ionic hydrocarbon surfactants. The results demonstrated that Gemini exhibited excellent surface activity and foam properties. The combination of Gemini with three ionic hydrocarbon surfactants showed a synergistic effect, and increasing the concentration of Gemini improved foam performance. Gemini enhanced foam performance by enhancing the alignment of surface adsorbed molecules at the liquid-air interface. Among the mixed systems, Gemini/SDS exhibited the highest foam stability.
This work presented a systematic study on the surface activity and foam performance of Gemini short-chain fluorocarbon surfactant (Gemini) solutions mixed with anionic, zwitterion, and non-ionic hydrocarbon surfactants. The results show that Gemini exhibits good surface activity and foam properties. The compounding of Gemini and three ionic hydrocarbon surfactants presents a good synergy, and with the increase of Gemini concentration, the foam performance improved. Gemini improves the foam performance by enhancing the alignment of surface adsorbed molecules at the liquid-air interface. Among all mixed systems, the Gemini/SDS shows the strongest foam stability. Compared to single SDS aqueous solution, the foam filtration time of mixed solution increased by 182.17 % with the addition of Gemini. The average bubble area in 30 min decreases by 8.03 %-46.32 %. The addition of Gemini slightly inhibited the foam coarsening of SDS solution when the Gemini concentration was 0.01 wt%. The foam coarsening process was significantly inhibited when the Gemini concentration was 0.1 wt%. The results of the present study are meant to provide guidance for the practical application of foams generated by the mixtures of the Gemini and hydrocarbon surfactants.
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