物理化学学报 >> 2012, Vol. 28 >> Issue (05): 1213-1217.doi: 10.3866/PKU.WHXB201203053

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Gemini表面活性剂乙烷基-α,ω-双十四烷基二甲基溴化铵产生的高稳定泡沫

吴晓娜, 邹文生, 赵剑曦   

  1. 福州大学化学化工学院, 胶体与界面化学研究所, 福州 350108
  • 收稿日期:2011-12-20 修回日期:2012-02-27 发布日期:2012-04-26
  • 通讯作者: 赵剑曦 E-mail:jxzhao.colloid@fzu.edu.cn
  • 基金资助:

    国家自然科学基金(20673021, 20873024)及福建省自然科学基金(2010J01038)资助项目

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 E-mail:jxzhao.colloid@fzu.edu.cn
  • 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).

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摘要： 报道了由gemini 表面活性剂乙烷基-α,ω-双十四烷基二甲基溴化铵(14-2-14)产生的高稳定泡沫体系.泡沫塌陷到初始高度一半所对应的时间(t1/2)用来表征泡沫的稳定性. 测得14-2-14体系的t1/2高达961 min, 远大于乙烷基-α,ω-双十二烷基二甲基溴化铵(12-2-12)产生泡沫的t1/2 (754 min), 表明带有一根短联接链和两条长尾链的gemini 表面活性剂是高效的泡沫稳定剂. 为了揭示界面弹性与泡沫稳定性之间的关联, 测量了表面活性剂吸附膜的扩张流变行为. 在指定的表面过剩量下, 吸附膜的高频极限弹性再一次被发现与泡沫稳定性相关,较大的极限弹性很好地对应更加稳定的泡沫.

关键词: 泡沫稳定剂, Gemini表面活性剂, 短联接链, 长尾链, 高界面弹性

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