Journal ArticleDOI
Filament stretching and capillary breakup extensional rheometry measurements of viscoelastic wormlike micelle solutions
TLDR
In this paper, a series of worm-like micelle solutions of both cetylpyridinium chloride and sodium salicylate (NaSal) in an aqueous sodium chloride solution and Cetyltrimethylammonium bromide and NaSal in de-ionized water were used to measure the extensional viscoelasticity of the worms.Abstract:
A filament stretching extensional rheometer and capillary breakup extensional rheometer are used to measure the extensional rheology of a series of wormlike micelle solutions experiencing a uniaxial elongational flow. The experiments are performed using a series of wormlike micelle solutions of both cetylpyridinium chloride and sodium salicylate (NaSal) in an aqueous sodium chloride solution and cetyltrimethylammonium bromide and NaSal in de-ionized water. The linear viscoelasticity of all the wormlike micelle solutions is well described by a Maxwell model with just one or two relaxation times while the steady shear measurements all demonstrate characteristics of shear banding at large shear rates. In transient homogeneous uniaxial extension imposed by a filament stretching rheometer, each of the wormlike micelle solutions demonstrate significant strain hardening. At large extension rates, the wormlike micelle solution filaments are all found to fail through a dramatic rupture near the axial midplane at a constant stress independent of imposed extension rate. The result is an extensional viscosity that decays linearly with increasing extension rate. This filament failure likely stems from the local scission of individual wormlike micelle chains. For the more concentrated solutions, as the imposed extension rate is reduced, a critical extension rate is found below which the filament does not rupture, but instead elastocapillary pinch off is recovered and the elastic tensile stresses achieved in the fluid filament grow far beyond the value observed at rupture. This dramatic upturn in the elastic tensile stress and the extensional viscosity at low extension rates is not intuitively expected and is most likely a result of structural changes to the entangled wormlike micelle solution. Strain hardening is also observed in capillary breakup rheometry experiments, however, when the results of filament stretching and capillary breakup rheometry measurements at nominally the same extension rate are superimposed, the results do not agree; the extensional viscosity measurements from filament stretching are in some instances more than an order of magnitude larger. This result calls into question the use of capillary breakup rheometry for quantitatively measuring the extensional viscosity of wormlike micelle solutions.read more
Citations
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Journal ArticleDOI
New measures for characterizing nonlinear viscoelasticity in large amplitude oscillatory shear
TL;DR: This work defines a robust and physically meaningful scheme to quantify materials which exhibit both viscous and elastic nonlinearities simultaneously, using an imposed large amplitude oscillatory shear (LAOS) strain.
Journal ArticleDOI
Fingerprinting Soft Materials: A Framework for Characterizing Nonlinear Viscoelasticity
TL;DR: In this article, the authors introduce a comprehensive scheme to quantify both viscous and elastic rheological nonlinearities simultaneously, using an imposed large amplitude oscillatory shear (LAOS) strain.
Journal ArticleDOI
A network scission model for wormlike micellar solutions: I. Model formulation and viscometric flow predictions
TL;DR: In this paper, a network model for wormlike micellar solutions is presented which incorporates scission and reforming of the chains, based on a discrete version of Cates' living polymer theory.
Journal ArticleDOI
Extensional rheology and elastic instabilities of a wormlike micellar solution in a microfluidic cross-slot device
TL;DR: In this paper, the authors present an experimental investigation of the flow of a model wormlike micellar solution (cetyl pyridinium chloride and sodium salicylate in deionised water) in a well-defined stagnation point extensional flow field generated within a microfluidic cross-slot device.
Journal ArticleDOI
The effect of step-stretch parameters on capillary breakup extensional rheology (CaBER) measurements
TL;DR: In this article, a series of experiments in which the step-stretch parameters of final length, and the extension rate of the stretch were varied and their effects on the measured extensional viscosity and extensional relaxation time were recorded.
References
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Masao Doi,Sam F. Edwards +1 more
TL;DR: In this article, the viscoelasticity of polymeric liquids was studied in the context of rigid rod-like polymers and concentrated solutions of rigid rods like polymers.
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