Rheological properties of the aqueous mixtures of cationic-anionic surfactants |
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Authors: | G -X Zhao J -X Xiao |
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Institution: | (1) Department of Chemistry, Peking University, 100871 Beijing, People's Republic of China;(2) Shanghai Institute of Organic Chemistry, Chinese Academy of Science, 354 Fenglin Lu, 200032 Shanghai, People's Republic of China |
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Abstract: | The rheological properties of the aqueous mixtures of cationic-anionic surfactants, both in single-phase systems and in aqueous two-phase systems, have been studied. Bizarre rheological properties —negative thixotropy, viscoelasticity and hihg viscosity of shear rate dependent at relatively low concentration — have been observed. An unusual viscosity change, that is, viscosity lowering with increasing concentration, was obtained. The negative thixotropy might be due to the existence of lamellar or sheet-like micelles, viscoelasticity might be induced by rodlike and lamellar or sheet-like micelles, the high viscosity might be a consequence of the formation of network by long rodlike micelles and the concentration-induced viscosity lowering could be interpreted in terms of the decrease of micellar dimensions with concentration. |
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Keywords: | Rheological property cationic-anionic surfactants negative thixotropy viscoelasticity |
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