<br>盐诱导的非离子胶束扩散泳：盐析和接近表面活性剂浊点的作用,Journal of Molecular Liquids

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盐诱导的非离子胶束扩散泳：盐析和接近表面活性剂浊点的作用
Journal of Molecular Liquids ( IF 5.3 ) Pub Date : 2022-04-29 , DOI: 10.1016/j.molliq.2022.119271
Eliandreina Cruz Barrios ₁ , Taylor C. Krause ₁ , Onofrio Annunziata ₁

Affiliation

盐诱导的扩散电渗疗法是由盐浓度梯度引起的胶体颗粒在水中的迁移。胶体颗粒的一个广泛例子是那些具有受聚乙二醇（PEG）官能团控制的界面特性的颗粒。由于盐析盐强烈影响 PEG-水相互作用，因此预计它们的梯度会产生基于 PEG 的颗粒的扩散泳。在这项工作中，在 Na 2 SO4 存在下表征了聚氧乙烯表面活性剂 tyloxapol 的非离子胶束的扩散电泳。具体来说，使用 Rayleigh 干涉测量法在 25 °C 下测量三元 tyloxapol-Na2SO4-water 系统的多组分扩散系数。这些传输数据，以及浊点和动态光散射扩散系数的测量，用于确定盐浓度对胶束迁移率、盐诱导的胶束扩散和胶束梯度诱导的盐渗透扩散的影响。研究发现，Na 2 SO 4 的梯度诱导胶束扩散电泳从高盐浓度到低盐浓度。此外，由于胶束尺寸和渗透压缩性随盐浓度的增加，扩散电泳成为负责表面活性剂浊点附近胶束运输的主要机制。采用水合模型从理论上描述盐析对胶束扩散和盐渗透扩散的影响。这项工作是第一份显示盐诱导的基于 PEG 的胶体颗粒的扩散泳并表征其在混溶性间隙附近的大小的报告。

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Salt-induced diffusiophoresis of a nonionic micelle: Roles of salting out and proximity to surfactant cloud point

Salt-induced diffusiophoresis is the migration of colloidal particles in water caused by salt concentration gradients. A widespread example of colloidal particles is represented by those with interfacial properties governed by polyethylene glycol (PEG) functionalities. Since salting-out salts strongly affect PEG-water interactions, their gradients are expected to generate diffusiophoresis of PEG-based particles. In this work, diffusiophoresis of nonionic micelles of tyloxapol, a polyoxyethylene surfactant, was characterized in the presence of Na2SO4. Specifically, multicomponent-diffusion coefficients were measured at 25 °C for the ternary tyloxapol-Na2SO4-water system using Rayleigh interferometry. These transport data, together with measurements of cloud points and dynamic-light-scattering diffusion coefficients, were used to determine the effect of salt concentration on micelle mobility, salt-induced micelle diffusiophoresis and salt osmotic diffusion induced by micelle gradients. It was found that gradients of Na2SO4 induce micelle diffusiophoresis from high to low salt concentration. Moreover, diffusiophoresis becomes the dominant mechanism responsible for micelle transport near surfactant cloud point due to increase in both micelle size and osmotic compressibility with salt concentration. A hydration model was employed to theoretically describe salt salting-out effect on micelle diffusiophoresis and salt osmotic diffusion. This work is the first report showing salt-induced diffusiophoresis of a neutral PEG-based colloidal particle and characterizing its magnitude near miscibility gaps.

更新日期：2022-04-29

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