通过尿素添加调节伪端微乳液中的界面性质:表面活性剂对逆细胞结构和相互作用的影响
Ipshita Majumdar1, Ashok K Ganguli1,2
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Langmuir : the ACS journal of surfaces and colloids
|August 1, 2024
概括
尿素添加会根据酒精与表面活性剂的连锁长度不同地影响逆细胞 (RM) 结构. 这项研究揭示了尿素可以诱导RM的聚合或分解,改变溶解动力学和细胞间相互作用.
科学领域:
- 物理化学 物理化学
- 合体和表面科学科学
- 超分子化学 超分子化学
背景情况:
- 反向微粒 (RMs) 在水性核中的疏水性物质溶解中至关重要.
- 了解RM的结构和界面特性是它们在各种领域应用的关键.
- 表面活性剂和尿素等添加剂对RM行为的影响需要详细调查.
研究的目的:
- 为了研究CTAB/异 octane/酒精/水性尿素反向微粒的结构和界面特性.
- 为了探索不同酒精与表面活性剂连锁长度对在尿素存在时RM行为的影响.
- 阐明尿素对细胞聚合,溶解动态和细胞间相互作用的影响.
主要方法:
- 利用时间分辨的光异质性来研究动态特性和细胞聚合.
- 采用小角度X射线散射 (SAXS) 来分析微乳液结构和细胞间相互作用.
- 研究了三个系统:CTAB/1-butanol,CTAB/1-hexanol和CTAB/1-octanol/isooctane/water,具有固定水负载 (w0 = 12).
主要成果:
- 尿素诱导了CTAB/1-butanol和CTAB/1-hexanolRM中的细胞聚合,但导致了CTAB/1-octanolRM中的分解.
- 尿素添加在较高度的RMs中减缓了溶解动态,由更长的溶剂相关性衰变寿命表明.
- 通过Sticky Hard Sphere (SHS) 和Macroion模型建模的SAXS数据分别揭示了不同的吸引力和排斥力细胞间力量.
结论:
- 该研究表明,尿素对RMS的影响取决于辅表面活性剂的酒精链长度.
- 虽然RM的形状保持不变,但尿素和表面活性剂的变化显著改变了RM的大小和界面特性.
- 调查结果为设计和控制特定应用的伪第三方RM系统提供了洞察力.
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