Investigating the morphological transitions in an associative surfactant ternary system
Investigating the morphological transitions in an associative surfactant ternary system
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研究缔合表面活性剂三元体系的形态转变
DOI：
10.1039/d1sm01668g
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Niroobakhsh, Zahra
中科院分区：
文献类型：
--
作者：
Honaryar, Houman;LaNasa, Jacob A.;Hickey, Robert J.;Shillcock, Julian C.;Niroobakhsh, Zahra
涉及极性油的缔合表面活性剂系统最近已显示通过在液体界面处形成纳米结构来稳定不混溶的液体，并且已用于印刷软材料。虽然这些相关的表面活性剂系统显示出很大的希望，创造纳米结构的软材料，自组装过程的基本理解仍然是未知的。在这项研究中，一个系统的阳离子表面活性剂氯化十六烷基吡啶一水合物（CPCl），极性油（油酸）和水的三元相图建立通过实验和模拟，研究平衡相行为。采用目视检查、小角X射线散射（SAXS）和流变测量的组合来建立自组装材料的相行为和性质。耗散粒子动力学（DPD）被用来模拟在这个系统中的形态的形成，并支持实验结果。模拟得到的三元相图与实验结果一致，表明计算模拟作为中尺度实验系统的补充具有鲁棒性。我们观察到形态转变（例如，胶束到双层和囊泡到层状）在三元图上的实验和模拟之间一致。DPD模拟正确地预测缔合表面活性剂系统由于组分的共组装而形成新的纳米级相。建立的三元相图和DPD模型为预测和控制不同介观结构（如片状或囊泡）的形成铺平了道路，为液中液3D打印相关应用定制和合成所需形态开辟了新途径。
Associative surfactants systems involving polar oils have recently been shown to stabilize immiscible liquids by forming nanostructures at the liquid interface and have been used to print soft materials. Although these associating surfactant systems show great promise for creating nanostructured soft materials, a fundamental understanding of the self-assembly process is still unknown. In this study, a ternary phase diagram for a system of cationic surfactant cetylpyridinium chloride monohydrate (CPCl), a polar oil (oleic acid), and water is established using experiment and simulation, to study the equilibrium phase behavior. A combination of visual inspection, small-angle X-ray scattering (SAXS), and rheological measurements was employed to establish the phase behavior and properties of the self-assembled materials. Dissipative particle dynamics (DPD) is used to simulate the formation of the morphologies in this system and support the experimental results. The ternary phase diagram obtained from the simulations agrees with the experimental results, indicating the robustness of the computational simulation as a supplement to the mesoscale experimental systems. We observe that morphological transitions (e.g., micelle-to-bilayer and vesicle-to-lamellar) are in agreement between experiments and simulations across the ternary diagram. DPD simulations correctly predict that associative surfactant systems form new nanoscale phases due to the co-assembly of the components. The established ternary phase diagram and the DPD model pave the way towards predicting and controlling the formation of different mesostructures like lamellar or vesicles, opening new avenues to tailor and synthesize desired morphologies for applications related to liquid-in-liquid 3D printing.