Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (05): 1213-1217.doi: 10.3866/PKU.WHXB201203053

• SOFT MATTER • Previous Articles     Next Articles

Highly Stable Foams Generated by the Gemini Surfactant Ethanediyl-α,ω-bis(tetradecyldimethylammonium bromide)

WU Xiao-Na, ZOU Wen-Sheng, ZHAO Jian-Xi   

  1. Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China
  • Received:2011-12-20 Revised:2012-02-27 Published:2012-04-26
  • Contact: ZHAO Jian-Xi
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20673021, 20873024) and Natural Science Foundation of Fujian Province, China (2010J01038).

Abstract: This paper reports a highly stable foam system generated by the gemini surfactant ethanediyl- α,ω-bis(tetradecyldimethylammonium bromide) (referred to as 14-2-14). The time measured for the collapse of the foam to half its initial height was used to characterize the foam stability; it was as high as 961 min for this system and significantly longer than that (754 min) for ethanediyl-α,ω-bis(dodecyldimethylammonium bromide) (12-2-12) foams. Thus the gemini surfactant structure of a short spacer together with two long tails enabled it to be a highly efficient foam stabilizer. The dilational rheology of the adsorbed films revealed the relationship between the interfacial elasticity and the foam stability. The high-frequency limit of elasticity of the adsorbed film at a specific surface coverage was again found to indicate foam stability. A larger limit of elasticity indicated a more stable foam.

Key words: Foam stabilizer, Gemini surfactant, Short spacer, Long tail, High interfacial-elasticity


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