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表面活性剂囊泡的自我组装在加热后转化为粘弹性虫状囊
Tanner S Davies1, Aimee M Ketner, Srinivasa R Raghavan
1Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742-2111, USA.
Journal of the American Chemical Society
|May 18, 2006
概括
用5甲基酸 (5mS) 加热 cetyl trimethylammonium bromide (CTAB) 的水溶液将囊泡转化为类似虫的小胞. 这种过渡大大增加了液体粘度,在微流体学和石油回收方面提供了潜在的应用.
科学领域:
- 合体和表面科学科学
- 材料科学 材料科学 材料科学
- 类风病学 类风病学 类风病学
背景情况:
- 像 cetyl trimethylammonium bromide (CTAB) 这样的阴离子表面活性剂在水溶液中形成各种自组装结构.
- 添加特定的添加剂可以改变表面活性剂聚合行为和溶液特性.
研究的目的:
- 为了研究CTAB在5甲基酸 (5mS) 的存在下自我组装.
- 描述温度诱导的阶段过渡,从囊泡变成类似虫的微粒.
- 探索与此过渡相关的风质变化及其潜在应用.
主要方法:
- 在不同度下制备CTAB和5mS的水溶液.
- 温度控制的风湿学测量以评估粘度和粘性弹性.
- 微角中子散射 (SANS) 用于确定自组装结构的形态.
主要成果:
- 在5mS的存在下,CTAB的单状囊泡形成.
- 在高于临界温度的温度下加热后,囊泡转化为长,灵活的虫状囊.
- 这种转变导致溶液粘度显著增加 (高达1000倍),并从牛顿式转变为粘弹性,剪切稀释行为.
- 过渡温度取决于5mS的度.
- SANS数据表明,在一个狭窄的温度范围内,囊泡和小胞的共存带有连续的相位过渡.
结论:
- 通过加热CTAB/5mS溶液,可以诱导可调节的囊泡到囊的过渡.
- 随着加热后粘度的显著增加,具有潜在的应用.
- 潜在的应用包括微流体,控制释放系统和增强的石油回收.
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