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Rheological behavior and wall slip of dilute and semidilute CPyCl/NaSal surfactant solutions  

Kibum Sung (Department of Chemical and Biological Engineering and Applied Rheology Center Korea University)
Han, Min-Soo (Department of Chemical and Biological Engineering and Applied Rheology Center Korea University)
Kim, Chongyoup (Department of Chemical and Biological Engineering and Applied Rheology Center Korea University)
Publication Information
Korea-Australia Rheology Journal / v.15, no.3, 2003 , pp. 151-156 More about this Journal
Abstract
In this research, experimental studies were performed to examine the rheological behavior of equimolar solutions of cetylpyridinium chloride (CPyCl) and sodium salicylate (NaSal) solutions with concentration. The surfactant solutions were prepared by dissolving 2 mM/2 mM - 80 mM/80 mM of surfactant/counterion in double-distilled water. It has been observed that the zero shear viscosity shows abrupt changes at two critical values of C^*$ and C^{**}$. These changes are caused by the switching of relaxation mechanism with concentration of CPyCl/NaSal solutions at those concentrations. The wall slip velocities of dilute and semidilute CPyCl/NaSal solutions show a dramatic increase with shear rate where the shear viscosity exhibits shear thickening behavior for dilute solutions and shear thinning behavior for semi-dilute solutions, respectively. Considering that the dramatic increase in wall slip velocity should be related to the formation of shear-induced structure (SIS) in the surfactant solution, the shear thickening behavior of semi-dilute solutions is caused by elastic instability unlike the case of dilute solutions.
Keywords
zero shear viscosity; wall slip; shear induced structure; elastic instability;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 4  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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