Structure and composition of mixed micelles formed by nonionic block copolymers and ionic surfactants in water determined by small-angle neutron scattering with contrast variation
Structure and composition of mixed micelles formed by nonionic block copolymers and ionic surfactants in water determined by small-angle neutron scattering with contrast variation
复制标题
DOI：
10.1016/j.jcis.2021.10.176
复制
发表时间：
2022-03-01
影响因子：
9.9
通讯作者：
Alexandridis, Paschalis
中科院分区：
文献类型：
--
作者：
Kancharla, Samhitha;Bedrov, Dmitry;Alexandridis, Paschalis
假设：包含聚合物和表面活性剂的复杂流体表现出取决于整体组成和溶剂质量的有趣性质。宏观性质的最终决定因素是纳米尺度的缔合结构域。因此，确定结构域的结构和组成，以及它们对整体组成的响应是很重要的。实验：聚合物在水溶液中形成的混合胶束的结构和组成聚环氧乙烷聚环氧丙烷（环氧乙烷）（PEO-PPO-PEO）嵌段共聚物（普朗尼克或泊洛沙姆）和离子表面活性剂十二烷基硫酸钠（SDS）的浓度由在不同对比度下获得的小角中子散射（SANS）强度数据的分析确定。不同的聚合物和浓度已经probed.Findings：SDS +普朗尼克混合胶束包括聚合物和一些水的胶束核心，主要是由烷基链形成。这与之前报道的不同，但与各种实验观察结果一致。本文首次报道了SDS + Pluronic P123（EO 19 PO 69 EO 19）组装体的结构。混合胶束的结构和组合物的表面活性剂的浓度和聚合物的疏水性的影响在这里讨论的上下文中的不同组分之间的相互作用。(C)2021爱思唯尔公司All rights reserved.
Hypothesis: Complex fluids comprising polymers and surfactants exhibit interesting properties which depend on the overall composition and solvent quality. The ultimate determinants of the macroscopic properties are the nano-scale association domains. Hence it is important to ascertain the structure and composition of the domains, and how they respond to the overall composition.Experiments: The structure and composition of mixed micelles formed in aqueous solution between poly (ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers (Pluronics or Poloxamers) and the ionic surfactant sodium dodecylsulfate (SDS) are determined from an analysis of small-angle neutron scattering (SANS) intensity data obtained at different contrasts. Different polymers and concentrations have been probed.Findings: The SDS + Pluronic mixed micelles include polymer and some water in the micelle core that is formed primarily by alkyl chains. This is different than what was previously reported, but is consistent with a variety of experimental observations. This is the first report on the structure of SDS + Pluronic P123 (EO19PO69EO19) assemblies. The effects on the mixed micelle structure and composition of the surfactant concentration and the polymer hydrophobicity are discussed here in the context of interactions between the different components. (C) 2021 Elsevier Inc. All rights reserved.