物理化学学报 >> 2016, Vol. 32 >> Issue (4): 863-871.doi: 10.3866/PKU.WHXB201601051

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阳离子表面活性剂和有机酸混合水溶液的热响应特性

韩传红,耿培培,郭严,陈肖肖,郭晓冬,张军红,刘杰,魏西莲*()   

  • 收稿日期:2015-10-21 发布日期:2016-04-07
  • 通讯作者: 魏西莲 E-mail:weixilian123@126.com
  • 基金资助:
    国家自然科学基金(21473084, 21073081, 21373106, ZR2012BQ013);聊城大学科研课题(LDSY2014008);实验技术(314011402)

Thermoresponsive Properties of a Mixed Aqueous Solution of Cationic Surfactant and Organic Acid

Chuan-Hong HAN,Pei-Pei GENG,Yan GUO,Xiao-Xiao CHEN,Xiao-Dong GUO,Jun-Hong ZHANG,Jie LIU,Xi-Lian WEI*()   

  • Received:2015-10-21 Published:2016-04-07
  • Contact: Xi-Lian WEI E-mail:weixilian123@126.com
  • Supported by:
    the National Natural Science Foundation of China(21473084, 21073081, 21373106, ZR2012BQ013);Scientific Research of Liaocheng University, China(LDSY2014008);Experimental Technology Science Research Project of Liaocheng University, China(314011402)

摘要:

用稳态和动态流变学方法研究了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和有机酸3-甲基水杨酸(3MS)的混合水溶液随浓度和温度变化的流变特性。在加热过程中混合溶液呈现三种不同类型的温度响应。其中最有趣的是,当3MS的浓度在80与100 mmol·kg-1之间时,有浅蓝色的稀溶液出现。随着温度的升高,样品由浅蓝色溶液转化成透明的粘弹性溶液,同时聚集态从囊泡转变成长的蠕虫状胶束,且开始转化的温度随溶液中3MS浓度的增加而升高。利用流变温度扫描和电导率测定对此转变进行了验证。定性解释这个转化是因为在高温下吸附的3MS分子从囊泡上解吸被溶解到水相中。

关键词: 表面活性剂, 胶束, 囊泡, 热敏性, 流变性能

Abstract:

Rheological properties of aqueous mixtures of the traditional cationic surfactant cetyltrimethylammonium bromide (CTAB) and organic acid 3-methylsalicylic acid (3MS) were studied as a function of concentration and temperature using steady-state and frequency sweep-rheological measurements. Upon being heated, the solutions exhibited three different types of response. Among them, the most interesting response was that light blue dilute solutions formed over the 3MS concentration range of 80 to 100 mmol·kg-1. These samples changed from dilute pale blue solutions to transparent viscoelastic ones as their aggregation state transitioned from vesicles to long worm-like micelles with increasing temperature. Moreover, the threshold temperature of the transition increased with 3MS concentration. The results of rheological temperature scanning and conductivity measurements verified this trend. A qualitative explanation for this transformation is that bound 3MS molecules dissociate from the vesicles and join the bulk aqueous phase at high temperature.

Key words: Surfactant, Micelle, Vesicle, Thermoresponsive, Rheological property

MSC2000: 

  • O648