在状表面活性剂相中插入阳离子合成粘土
Isabelle Grillo1, Sylvain Prévost2, Thomas Zemb3
1Large Scale Structures, Institut Laue-Langevin - The European Neutron Source, 71, avenue des Martyrs, 38042, Grenoble, France.
The European physical journal. E, Soft matter
|September 12, 2024
概括
将合成离子粘土与表面活性剂混合,会产生由透压力和水竞争驱动的独特的合溶液. 不同类型的表面活性剂导致胀,入或相分离,揭示了这些混合物的复杂相互作用.
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
- 物理化学 物理化学
背景情况:
- 合成的阳离子粘土和表面活性剂可以形成状相.
- 粘土和表面活性剂之间的相互作用影响着状溶液结构.
- 透压是这些系统内水竞争的关键因素.
研究的目的:
- 为了研究离子粘土和表面活性剂混合的合溶液的相位行为.
- 了解分散,包含和相位分离背后的驱动力.
- 为了描述不同混合条件下形成的微观结构.
主要方法:
- 混合相当数量的合成离子粘土 (拉波尼特) 和各种表面活性剂.
- 对叶片相和粘土悬浮液的透压的分析.
- 小角度中子散射 (SANS) 和小角度X射线散射 (SAXS) 用于结构特征.
- 观察相位图和微观结构变化.
主要成果:
- 与拉波尼特的非离子表面活性剂混合物显示出由于粘土诱导的波纹而导致的胀,在较高度时表面活性剂被排除在外.
- 双离子系统 (AOT-Laponite) 呈现出静电优势,导致三种不同的模式.
- 离子混合物与离子脂 DDAB 显示有效的长距离顺序和排除 2% 门以上的贫土阶段.
结论:
- 奥斯摩斯压力和水竞争是控制离子粘土和表面活性剂混合行为的关键因素.
- 表面活性剂的类型 (非离子,离子,阴离子) 决定了所得到的微观结构和相位行为.
- 这些发现提供了对光热层系统中复杂的相位图和相互作用的洞察.
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