在SDS-DDAO混合表面活性剂微粒中的度依赖非对称协同作用
Luis M G Torquato1, Gunjan Tyagi1, William N Sharratt1
1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, U.K.
Langmuir : the ACS journal of surfaces and colloids
|March 27, 2024
概括
这项研究揭示了二甲基硫酸盐 (SDS) 和N,N-二甲基甲二胺 N-氧化物 (DDAO) 的混合表面活性剂系统如何改变菌粒结构并与度充电. 在这些混合中,最大的协同作用会随着度的变化而变化,从而提供了对它们相互作用的见解.
科学领域:
- 物理化学 物理化学
- 合体和表面科学科学
- 材料科学 材料科学 材料科学
背景情况:
- 混合表面活性剂系统在各种工业应用中至关重要.
- 了解阳离子和两表面活性剂之间的协同相互作用是优化配方的关键.
- 二甲基硫酸盐 (SDS) 和N,N-二甲基二甲基胺 N-氧化物 (DDAO) 构成了研究这种相互作用的模型系统.
研究的目的:
- 为了研究SDS-DDAO混合表面活性剂小粒的结构和相互作用动态.
- 为了确定不同的表面活性剂度和比率如何影响菌根性质.
- 阐明这种混合细胞系统中的协同行为和潜在机制.
主要方法:
- 微角中子散射 (SANS) 用于微粒结构.
- 福里埃变换红外光谱 (FTIR) 用于头组相互作用.
- 动态光散射 (DLS) 用于微粒大小和扩散.
- 测量pH值以监测表面活性剂的质子和解离.
主要成果:
- 随着表面活性剂度的增加,观察到细胞的延长和细胞电荷的显著增加.
- 表面活性剂的协同作用,影响电荷,大小,扩散和pH值,根据度和成分而异.
- 在低度的不对称DDAO比率 (65-85%) 发生最大的协同作用,并在较高度时转移到等等的.
结论:
- 这项研究提供了对SDS-DDAO混合菌根的协同作用行为的全面了解.
- 正则溶液理论有助于合理化在较低度下观察到的不对称协同作用.
- 这些发现为设计和控制混合表面活性剂系统的特性提供了宝贵的见解.
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