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Effect of the Janus Amphiphilic Wall on the Viscosity Behavior of Aqueous Surfactant Solutions.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-17 , DOI: 10.1021/acs.langmuir.0c01359
Hiroaki Tsujinoue 1 , Yusei Kobayashi 1 , Noriyoshi Arai 1
Affiliation  

The effects of the chemical nature of an interface are one of the key parameters which can affect self-assembly and rheological behavior. To date, several studies have reported self-assembled structures and rheological behaviors in the development of various functional materials. In this study, we investigated the self-assembly and viscosity behavior of aqueous surfactant solutions confined in three types of Janus amphiphilic nanotubes (JANTs), which have two, four, and eight sequential domains, respectively, using molecular simulation. We found that the viscosity behavior depends on the surfactant concentration and the chemical nature of the wall surface. For instance, although the concentration levels of the surfactants are the same (c = 10%), completely different viscosity behaviors were observed in the two sequential domains (Newtonian-like) and the four and eight sequential domains (strong shear-thinning) of the JANTs. Our simulations demonstrated how the rheological properties of aqueous surfactant solutions, including viscosity and velocity profiles, can be controlled by the chemical nature of the JANT wall surface, effect of confinement, and their self-assembly structures. Considering the foregoing, we hope that our study offers new knowledge on nanofluid systems.

中文翻译:

Janus两亲性壁对表面活性剂水溶液粘度行为的影响。

界面化学性质的影响是可能影响自组装和流变行为的关键参数之一。迄今为止,数项研究报告了在各种功能材料开发过程中的自组装结构和流变行为。在这项研究中,我们使用分子模拟研究了局限在三种类型的Janus两亲纳米管(JANTs)中的表面活性剂水溶液的自组装和粘度行为,分别具有两个,四个和八个顺序域。我们发现,粘度行为取决于表面活性剂的浓度和壁表面的化学性质。例如,虽然表面活性剂的浓度水平是相同的(C ^= 10%),在JANTs的两个顺序域(牛顿样)和四个和八个顺序域(强剪切稀化)中观察到完全不同的粘度行为。我们的模拟表明,如何通过JANT壁表面的化学性质,约束作用及其自组装结构来控制表面活性剂水溶液的流变特性(包括粘度和速度分布)。考虑到上述情况,我们希望我们的研究提供有关纳米流体系统的新知识。
更新日期:2020-09-15
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