NDLI: Determination of flow activation energy at viscosity maximum for spherical and wormlike micelles of different lengths and flexibility

Content Provider	Springer Nature Link
Author	Razak, razizah A. Khan, M. Niyaz
Copyright Year	2013
Abstract	Steady shear rheological measurements were carried out on aqueous solutions containing 15 mM cetyltrimethylammonium bromide (CTABr) and a constant value of [MX] and temperature for MX = 2,3-; 2,4-; 2,5-; 2,6-; 3,4-; and 3,5-Cl2BzNa with Bz−representing C6H3CO2̅. Plots of zero shear viscosity (η 0) vs. [MX] at 35 °C and 15 mM CTABr show the presence of single maximum and double maxima for MX = 2,3- and 3,5-Cl2BzNa, respectively. Turbidity data (absorbance at 600 nm vs. [MX]) coupled with η 0vs. [MX] data at 35 °C reveal indirectly the presence of vesicles along with wormlike micelles (WM) at MX / CTABr > 0. 7 for MX = 3,5-Cl2BzNa. Temperature dependence of η 0in the vicinity of the viscosity maximum shows nonlinear and linear Arrhenius behavior, within the temperature range of 20–55 °C, for MX = 2,3-; 2,4-; 2,5-; 3,4-; and 3,5-Cl2BzNa, respectively. The values of η 0, $\dot {\gamma }_{\text {cr}} $ (critical shear rate), and flow activation energy correlate with CTABr micellar binding constants of counterions.
Starting Page	927
Ending Page	937
Page Count	11
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	52
Issue Number	10-12
e-ISSN	14351528
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-09-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rheology Wormlike micelles Counterion effect Temperature effect Micellar growth Flow activation energy Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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