The pH and temperature dual-responsive micelle transition in the mixture of hydrotrope potassium phthalic acid and quaternary ammonium surfactants cetyltrimethylammonium bromide |
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| Authors: | Cunchuan Zheng Li Wang Zhiyu Huang |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China;2. Sichuan Institute of Fine Chemical Industry Research and Design, Chengdu, P. R. China;3. Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu, P. R. China;4. Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, P. R. China |
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| Abstract: | A facile and effective route to prepare a pH and temperature dual-responsive surfactant micelle has been introduced based on hydrotrope potassium phthalic acid (PPA) and quaternary ammonium surfactants cetyltrimethylammonium bromide (CTAB). The system can be switched between viscoelastic solution and water-like fluid by adjusting pH values. In this paper, different binding abilities between the hydrotrope and surfactants have been demonstrated during the process of adjusting pH because the hydrotrope has different ionization degrees with the pH variation. And with the aid of rheological measurements and cryo-TEM observation, we discussed the different effects of the hydrotrope on surfactants at various pH values in detail and analyzed the possible aggregate transition mechanism of CTAB–PPA system induced by pH. Besides, this CTAB–PPA system has temperature-responsive property when pH?
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| Keywords: | micells transition pH responsive temperature responsive |
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