Temperature-induced micelle transition of gemini surfactant in aqueous solution |
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Authors: | Hong Chen Zhongbin Ye Lijuan Han Lei Zhang |
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Institution: | a State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, PR China b College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China |
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Abstract: | The viscosity and morphology of gemini surfactant in aqueous solution at various temperatures are investigated by rheometer and transmission electron microscopy with a freeze fracture replication technique. The viscosity of 18-3-18 or 16-3-16 reaches its maximum when the solution temperature is near the Krafft temperature of the surfactant. The morphology of a gemini surfactant in aqueous solution is strongly influenced by the temperature: vesicles or sphere-like aggregates are formed in the dilute solution of 18-3-18 under 25 °C environment; when the solution temperature goes up to 50 °C, such aggregates will transit to worm-like micelles with the length of each from 100 nm to 400 nm; meanwhile, the increase of concentration may lead to the formation of network; however, the worm-like micelles or network will transit to vesicles or sphere-like aggregates again when the temperature reaches 80 °C. |
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Keywords: | Gemini surfactant Vesicle Worm-like micelle Transition |
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