Interfacial viscoelasticity in oscillating drops of cyclodextrin-surfactant aqueous solution: experiments and theory.

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL Soft Matter Pub Date : 2024-11-14 DOI:10.1039/d4sm01007h
J Roberto Romero-Arias, Alberto S Luviano, Miguel Costas, Aurora Hernández-Machado, Rafael A Barrio
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Abstract

We present experiments involving oscillating droplets in aqueous cyclodextrin-surfactant solutions. In these experiments, α-cyclodextrin (αCD) and anionic surfactants exhibit remarkable viscoelasticity at the liquid/air interface, with dilatational modulus varying across orders of magnitude. This rheological response depends on the concentrations of different complexes in the solution, particularly of the 2 : 1 inclusion complexes formed by two αCD molecules (αCD2), and one surfactant (S). We propose a model that describes the distribution of these complexes on the droplet surface using a free energy approach, accounting for dipole-dipole interactions. The results of the model reproduce the interfacial behavior of the viscoelastic modulus and phase shift in excellent agreement with the data, clearly indicating that dipole-dipole interactions determine and control the viscoelastic properties of the drops.

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环糊精-表面活性剂水溶液振荡液滴中的界面粘弹性:实验与理论。
我们展示了环糊精-表面活性剂水溶液中的振荡液滴实验。在这些实验中,α-环糊精(αCD)和阴离子表面活性剂在液体/空气界面上表现出显著的粘弹性,其扩张模量在不同数量级之间变化。这种流变反应取决于溶液中不同复合物的浓度,尤其是由两个 αCD 和阴离子表面活性剂形成的 2 :由两个 αCD 分子(αCD2)和一个表面活性剂(S)形成的 2 : 1 包合物。我们提出了一个模型,利用自由能方法描述了这些复合物在液滴表面的分布,并考虑了偶极-偶极相互作用。模型的结果再现了粘弹模量和相移的界面行为,与数据非常吻合,清楚地表明偶极-偶极相互作用决定并控制着液滴的粘弹特性。
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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Where physics meets chemistry meets biology for fundamental soft matter research.
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