The rheological behavior and microstructure of branched, cationic wormlike micellar (WLM) solutions of 40 mM erucyl bis(hydroxyethyl)methylammonium chloride (EHAC) are studied as a function of added salt (sodium salicylate) concentration, temperature, and shear rate via Rheosmall-angle light scattering (Rheo-SALS). These WLM solutions exhibit shear-enhanced concentration fluctuations leading to shear-induced phase separation (SIPS), manifested as visual turbidity under shear and the appearance of a characteristic “butterfly” scattering pattern in Rheo-SALS experiments. Flow kinematics measurements in a Couette geometry are used to determine the relationship between SIPS and shear banding, i.e., the splitting of the flow into shear bands with different local shear rates. Modeling using the Giesekus constitutive equation aids in discrimination between banding and nonbanding solutions. The combination of Rheo-SALS, dynamic rheology, velocimetry, and constitutive equation modeling allows detailed exploration of the relationship between SIPS, shear banding, fluid microstructure, and the equilibrium phase behavior.
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November 2011
Research Article|
November 01 2011
Shear-induced phase separation (SIPS) with shear banding in solutions of cationic surfactant and salt
Special Collection:
Shear Banding
Prachi Thareja;
Prachi Thareja
Department of Chemical Engineering,
University of Delaware Newark, Delaware 19716
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Ingo H. Hoffmann;
Ingo H. Hoffmann
Technische Universität
, Berlin, 10623 Germany
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Matthew W. Liberatore;
Matthew W. Liberatore
Department of Chemical Engineering,
Colorado School of Mines
, Golden, Colorado 80401
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Matthew E. Helgeson;
Matthew E. Helgeson
Department of Chemical Engineering,
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139
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Y. Thomas Hu;
Y. Thomas Hu
Unilever Research and Development
, Trumbull, Connecticut 06611
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Michael Gradzielski;
Michael Gradzielski
Technische Universität
, Berlin, 10623 Germany
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Norman J. Wagner
Norman J. Wagner
a)
Department of Chemical Engineering,
University of Delaware
, Newark, Delaware 19716
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a)
Author to whom correspondence should be addressed; electronic mail: wagnernj@udel.edu
J. Rheol. 55, 1375–1397 (2011)
Article history
Received:
March 26 2011
Citation
Prachi Thareja, Ingo H. Hoffmann, Matthew W. Liberatore, Matthew E. Helgeson, Y. Thomas Hu, Michael Gradzielski, Norman J. Wagner; Shear-induced phase separation (SIPS) with shear banding in solutions of cationic surfactant and salt. J. Rheol. 1 November 2011; 55 (6): 1375–1397. https://doi.org/10.1122/1.3641517
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