Study on rheology of novel UV/visible light sensitive trimeric cationic surfactant/trans-4-phenylazo benzoic acid micelle system

IF 1.2 4区工程技术 Q4 CHEMISTRY, APPLIED

Tenside Surfactants Detergents Pub Date : 2024-09-11 DOI:10.1515/tsd-2024-2590

Xiaoyang Han, Yudie Li, Bo Fang, Wenting Xu

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引用次数: 0

Abstract

The trimeric cetyl cationic surfactant (TGC) forms reversible photosensitive micelle systems with the photosensitive counterions trans-4-phenylazo benzoic acid (trans-ACA). The Carreau-Yasuda model was used for the flow curves before and after UV irradiation. The effects of trans-ACA concentration, TGC concentration, and different durations of UV (365 nm) and visible light (465 nm) irradiation on the rheological properties of TGC/trans-ACA were investigated. Prior to UV irradiation, the TGC/trans-ACA system was composed of wormlike micelles, which showed pronounced shear thinning behavior, good thixotropy and viscoelasticity. Macroscopically, it appears as a difficult to flow solution. After UV irradiation, trans-ACA is isomerized to cis-ACA, and the worm-like micelles are transformed to spherical or short rod-like micelles, resulting in a significant decrease in thixotropy and viscoelasticity, and thus a decrease in viscosity and an increase in fluidity. At lower TGC concentrations, UV irradiation can induce a reversal of the rheological properties of the TGC/trans-ACA system, which exhibits a complete solution state. Exposure to visible light restores the rheology of the system to that prior to UV irradiation. Under UV and visible light irradiation at different times, the system obeys to the rheo-kinetic equation. The UV–vis spectrum confirms that the changes in the rheological properties of the TGC/trans-ACA system are due to the reversible photoisomerization of trans-ACA.

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新型紫外线/可见光敏感三聚阳离子表面活性剂/反式-4-苯基偶氮苯甲酸胶束体系的流变学研究

三聚十六烷基阳离子表面活性剂（TGC）与光敏反离子反式-4-苯基偶氮苯甲酸（反式-ACA）形成可逆的光敏胶束系统。紫外线照射前后的流动曲线采用 Carreau-Yasuda 模型。研究了反式-ACA 浓度、TGC 浓度以及紫外线（365 纳米）和可见光（465 纳米）照射的不同持续时间对 TGC/trans-ACA 流变特性的影响。紫外线照射前，TGC/反式-ACA 体系由蠕虫状胶束组成，具有明显的剪切稀化行为、良好的触变性和粘弹性。从宏观上看，它是一种难以流动的溶液。紫外线照射后，反式-ACA 异构化为顺式-ACA，蚯蚓状胶束转变为球状或短杆状胶束，导致触变性和粘弹性显著降低，从而降低了粘度，增加了流动性。在 TGC 浓度较低时，紫外线照射会导致 TGC/trans-ACA 体系的流变特性发生逆转，呈现完全溶解状态。暴露在可见光下，该体系的流变特性会恢复到紫外线照射前的状态。在不同时间的紫外线和可见光照射下，体系服从流变动力学方程。紫外可见光谱证实，TGC/反式-ACA 体系流变特性的变化是由反式-ACA 的可逆光异构化引起的。

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来源期刊

Tenside Surfactants Detergents 工程技术-工程：化工

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

3.8 months

期刊介绍： Tenside Surfactants Detergents offers the most recent results of research and development in all fields of surfactant chemistry, such as: synthesis, analysis, physicochemical properties, new types of surfactants, progress in production processes, application-related problems and environmental behavior. Since 1964 Tenside Surfactants Detergents offers strictly peer-reviewed, high-quality articles by renowned specialists around the world.