Applications often expose wormlike micelle solutions to a very wide range of shear and temperature conditions. The two-species model presented in Part I [Salipante et al., J. Rheol. 68 (2024)] describes the nonlinear rheology over a wide range of shear rates. Here, we compare the model predictions to measurements using a combination of microcapillary and rotational rheology to measure the viscosity of surfactant solutions across seven decades of shear rate and five decades of viscosity. The effect of temperature is studied between 20 and 60 C for different surfactant concentrations. Model parameters are determined from both small-amplitude shear measurements and fitting to the nonlinear data. Under shear stress, the model predicts due to hindered combination kinetics that the average micelle length decreases from several micrometers to a few hundred nanometers. At sufficiently high stress, the micelle shear rheology exhibits a transition from entangled wormlike behavior to a dilute rod rheology in agreement with the model. Transient stress-growth measurements exhibit a large overshoot, which is rather well predicted by the model with hindered combination rate. Microcapillary flow birefringence also is adequately predicted by the model, confirming the accuracy of its predicted micelle lengths and exhibiting a marked change in stress-optic response at the transition between entangled polymers and dilute rods. The relaxation of retardance after flow cessation follows model predictions that include micelle-micelle interactions, which are sensitive to the rotational diffusivity and length. These methods can be applied broadly to explore relationships between composition and performance.
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November 2024
Research Article|
October 08 2024
Two-species model for nonlinear flow of wormlike micelle solutions. Part II: Experiment
Paul F. Salipante
;
Paul F. Salipante
a)
1
Polymers and Complex Fluids Group, National Institute of Standards and Technology
, Gaithersburg, Maryland 20899a)Authors to whom correspondence should be addressed; electronic mail:paul.salipante@nist.gov; mec2sma@rit.edu; and steven.hudson@nist.gov
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Michael Cromer
;
Michael Cromer
a)
2
School of Mathematics and Statistics, Rochester Institute of Technology
, Rochester, New York 14623a)Authors to whom correspondence should be addressed; electronic mail:paul.salipante@nist.gov; mec2sma@rit.edu; and steven.hudson@nist.gov
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Steven D. Hudson
Steven D. Hudson
a)
1
Polymers and Complex Fluids Group, National Institute of Standards and Technology
, Gaithersburg, Maryland 20899a)Authors to whom correspondence should be addressed; electronic mail:paul.salipante@nist.gov; mec2sma@rit.edu; and steven.hudson@nist.gov
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a)Authors to whom correspondence should be addressed; electronic mail:paul.salipante@nist.gov; mec2sma@rit.edu; and steven.hudson@nist.gov
J. Rheol. 68, 895–911 (2024)
Article history
Received:
October 06 2023
Accepted:
September 14 2024
Citation
Paul F. Salipante, Michael Cromer, Steven D. Hudson; Two-species model for nonlinear flow of wormlike micelle solutions. Part II: Experiment. J. Rheol. 1 November 2024; 68 (6): 895–911. https://doi.org/10.1122/8.0000776
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