Synthesis, surface activities and aggregation properties of asymmetric Gemini surfactants
Autor: | Tao Yang, Yangchun Xie, Xiaohua He, Junjun Ma |
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Rok vydání: | 2021 |
Předmět: | |
Zdroj: | Physical Chemistry Chemical Physics. 23:27460-27467 |
ISSN: | 1463-9084 1463-9076 |
Popis: | A series of Gemini surfactants with asymmetric structure (PKO 15-3(OH)-n; n = 12, 14 and 16) were synthesized through a simple two-step reaction including ring-opening reaction and quaternization reaction. The surface tension measurements indicated that the surface activities of PKO 15-3(OH)-n were higher than those of traditional single-chain and symmetrical Gemini surfactants. The thermodynamic parameters obtained from electrical conductivity measurements showed that the micellization processes of PKO 15-3(OH)-n were spontaneous and entropy-driven. Transmission electron microscopy and dynamic light scattering measurements confirmed that PKO 15-3(OH)-n molecules with a higher asymmetric degree could form vesicles, in which surfactant molecules were interdigitated side-by-side in the vesicle membrane. The obtained results are not in accordance with those calculated from the critical packing theory, which can further complement the theory. |
Databáze: | OpenAIRE |
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