POSS基巨型-小分子复合表面活性剂纳米乳液的构建与性能

doi:10.3969/j.issn.2097-2806.2026.10.004

Abstract

Abstract:

The performance of nanoemulsions is highly dependent on the molecular structure and interfacial behavior of the surfactants. Their large specific surface area, excellent stability, and high permeability offer key advantages for colloidal systems, making them widely applicable in the fields of targeted drug delivery, enhanced oil recovery, and functional coatings. In this work, a sulfonic acid-functionalized cage-like silsesquioxane giant surfactant （7Tau-POSS-C₈） was synthesized, and then it was blended with fatty alcohol polyoxyethylene ether （JFC） and isotridecyl alcohol polyoxyethylene ether （TO-4070） to form ternary surfactant mixtures with different mass ratios. These ternary surfactant mixtures were used to prepare nanoemulsions in which methanol was employed as the co-surfactant and limonene as the oil phase. The influences of the type and proportion of the surfactant mixtures on the nanoemulsion formation were systematically studied by constructing and optimizing pseudo-ternary phase diagrams. The experimental results showed that the area of nanoemulsion region reached the maximum （28.03%） when the mass ratio of 7Tau-POSS-C₈ to JFC to TO-4070 was 1:2:2. The nanoemulsion thus obtained exhibited small droplet size （< 200 nm）, good monodispersity, and low interfacial tension （0.07 mN/m）. Rheological experiments demonstrated that the presence of 7Tau-POSS-C₈ effectively suppressed the viscosity rise during high-rate shearing, thereby enhancing the shear stability of the system. The oil-sand washing experiments showed that the nanoemulsion achieved high oil removal efficiency of 90.48%, which was significantly superior to those systems stabilized by single small-molecule surfactants. According to the results of microscopic morphology, surface tension, and interfacial behavior, this work elucidated the key synergistic roles of 7Tau-POSS-C₈ with small-molecule surfactants in improving the emulsifying ability, interfacial activity, and application performance of nanoemulsions. This work could provide theoretical insights and practical guidance for the design of high-performance nanoemulsions based on giant surfactants.

Key words: giant surfactant, nanoemulsion, pseudo-ternary phase diagram, interfacial property

CLC Number:

TQ423

Rong Zhang, Lijun Zheng, Yan Wang, Jun Wang, Jiarui Hu, Xu Yang, Ping Zhao, Bin Lv. Preparation and properties of the nanoemulsions stabilized by ternary surfactant mixtures of a POSS-based giant surfactant and two small-molecule surfactants[J].China Surfactant Detergent & Cosmetics, 2026, 56(10): 1318-1326.

Figures/Tables 12

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References 26

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类型	m₁/g	m₂/g	m₃/g	洗油率/%
7Tau-POSS-C₈-NANO-E	2.0	28.75	27.13	90.48
TO-4070-NANO-E	2.0	27.99	26.36	88.10
JFC	2.0	28.68	26.87	45.24
TO-4070	2.0	28.55	26.75	47.62

Preparation and properties of the nanoemulsions stabilized by ternary surfactant mixtures of a POSS-based giant surfactant and two small-molecule surfactants

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