Abstract
Dual-stimulated wormlike micelles regulated by pH and temperature in a surface active ionic liquid system comprising of a cationic surfactant (N-cetyl-N-methylpyrrolidinium bromide (C16MDB)) and an aromatic dibasic acid (pyrocatechol) were investigated. Such a system can be reversibly switched between liquid-like and gel-like states on adjusting the solution pH value. The rheology, light scattering techniques and cryogenic-transmission electron microscopy (cryo-TEM) results show the growth of spherical micelles into long and entangled wormlike micelles was responsible for the changes in flow properties such as high viscosity, shear-thinning behaviour and Maxwell-type dynamic rheology. The nuclear magnetic resonance results reveal the binding capacity of pyrocatechol to C16MDB is proposed as the key factor of the unusual rheological and micellar responses of this pH-stimulated system. In addition, with the increase of temperature, molecular motion of surfactant molecules becomes more active, which endow the property of thermo-stimulated to the surface active ionic liquid system.
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We are grateful to the donors of the National Science Fund for Distinguished Young Scholars (51425406), the Chang Jiang Scholars Program (T2014152), the National Natural Science Foundation of China (21303268) and the Fundamental Research Funds for the Central Universities (15CX06022A) for their generous support of our research.
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Yan, Z., Dai, C., Zhao, M. et al. Thermal and pH dual stimulated wormlike micelle in aqueous N-cetyl-N-methylpyrrolidinium bromide cationic surfactant-aromatic dibasic acid system. Colloid Polym Sci 293, 2617–2624 (2015). https://doi.org/10.1007/s00396-015-3655-z
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DOI: https://doi.org/10.1007/s00396-015-3655-z