物理化学学报 >> 2012, Vol. 28 >> Issue (05): 1218-1222.doi: 10.3866/PKU.WHXB201202211

软物质 上一篇    下一篇

Bola反离子诱导的高粘弹十六烷基硫酸钠蠕虫胶束溶液

赵剑曦, 杨铎平   

  1. 福州大学化学化工学院应用化学系胶体与界面化学研究所, 福州 350108
  • 收稿日期:2011-11-16 修回日期:2012-02-01 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 Viscoelastic Worm-Like Micelle Solution of Sodium Hexadecyl Sulfate Induced by Bolaform Counterions

ZHAO Jian-Xi, YANG Duo-Ping   

  1. Institute of Colloid and Interface Chemistry, Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China
  • Received:2011-11-16 Revised:2012-02-01 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).

PDF

1354

赞

摘要： 利用稳态和频率扫描研究了十六烷基硫酸钠(SHS)与Bola 盐(N,N'-双乙基二甲基-α,ω-乙烷溴化铵(Bola2Et)或N,N'-三甲基-α,ω-丁烷溴化铵(Bola4))混合体系的流变行为. 实验结果表明两个体系均在45 °C时形成了长蠕虫胶束, 溶液呈现出高粘弹性, 尤其是SHS/Bola2Et 溶液表现出很高的弹性, 零剪接粘度高达2520 Pa·s, 表观上呈现胶状. 这些结果归因于在Bola 反离子诱导下, 表面活性剂SHS与Bola 反离子形成了静电吸引的2:1结构复合物. 由于这两个Bola 反离子的联接链长度均短于季铵离子的静电平衡距离, 因此形成的复合物在形状上有利于蠕虫胶束生成. 作为对比, 添加简单的四甲基铵反离子无法诱导SHS形成蠕虫胶束,溶液仅呈现低粘度.

关键词: 阴离子表面活性剂, Bola 反离子, 蠕虫状胶束, 高粘弹性

Abstract: The rheological behaviors of mixed aqueous solutions of sodium hexadecyl sulfate (SHS) and a bolaform salt, either N,N'-ethanediyl-α,ω-bis(ethyldimethylammonium bromide) (Bola2Et) or N,N'- propanediyl-α,ω-bis(trimethylammonium bromide) (Bola4), were investigated by steady-state and frequency-sweep measurements. The results showed that long worm-like micelles were formed in both systems at 45 °C, and the solutions exhibited high viscoelasticities, especially the SHS/Bola2Et system in which the solution had very high elasticity. The zero-shear viscosity of SHS/Bola2Et was as high as 2520 Pa·s, and the system was gel-like. These results were attributed to the formation of 2:1 complexes by electrostatic attraction. Since the spacers of both Bola counterions were shorter than the distance between quaternary ammonium ions under electrostatic equilibrium, the generated complex in shape favored formation of worm-like micelles. In comparison, it was difficult to induce SHS to form worm-like micelles by the addition of tetramethylammonium counterions, and the solution exhibited low viscosity.

Key words: Anionic surfactant, Bola-counterion, Worm-like micelle, High viscoelasticity