Effects of NaCl and temperature on rheological characteristics and structures of CTAB/NaSal wormlike micellar solutions

다국어 초록 (Multilingual Abstract)

Sodium chloride (NaCl) is the most abundant salt in seawater, which showed the strongest effect inlowering the viscosity of wormlike micellar solutions (WMS) compared to other investigated ioniccompounds. In this study, we examined the effect of NaCl addition on the structure of wormlike micellesusing the semi-quantitative rheo-structure relations provided by the reaction-reptation model. Prior toaddition of NaCl, the structure of wormlike micelles ([CTAB]/[NaSal] = 1 at [CTAB] = 100 mM) in thesolution were investigated at different temperatures (25 ℃

T

60 ℃). At higher temperatures, shorterrelaxation times and lower ratio values for the local minimum of loss modulus G00min



over the plateaumodulus (G00 ) were observed. Our results showed that while the zero-shear viscosity of WMS decreasedby NaCl addition (S = [NaCl]/[CTAB] varied from 0 to 9), itsfirst critical shear rate and shear stress plateauwere observed at their higher values. In addition, while the relaxation time of WMS decreased by addingNaCl, values of G00min=G00 did not change accordingly. These results indicate that branch points were formedupon the addition of NaCl and led to the shorter relaxation time and lower zero-shear viscosity.

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