Spatiotemporal stress and structure evolution in dynamically sheared polymer-like micellar solutions

Gurnon, A. Kate; López‐Barrón, Carlos R.; Eberle, Aaron P. R.; Porcar, Lionel; Wagner, Norman J.

doi:10.1039/c3sm53113a

Cited by 41 publications

(44 citation statements)

References 39 publications

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“…(11)- (14), which we calculated from the Giesekus model coincide quantitatively with the results of Gurnon and Wagner [86]. As Eq.…”

Section: Analytical Solutions For Steady-state Shear Flowsupporting

confidence: 67%

“…The extensive experiments of Calin, Wilhelm, and Balan revealed that, besides studying the shear-thinning properties, LAOS experiments could successfully be applied in order to measure the nonlinear α-parameter (mobility factor) of the Giesekus model [85]. An extensive description of LAOS measurements in aqueous solutions of banding and non-banding wormlike micelles and the evaluation of the Giesekus model parameters were recently performed by Gurnon and Wagner [86]. The mentioned last three publications have extensively analyzed the non-linear properties of the shear stress in LAOS experiments.…”

Section: Introductionmentioning

confidence: 98%

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Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Rehage

Fuchs

2015

Colloid Polym Sci

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In a series of experiments, we investigated the non-linear rheological properties of aqueous solutions of entangled wormlike micelles (WLMs) in steady-state shear flow and in large amplitude oscillating shear (LAOS) experiments. On grounds of their monoexponential stress relaxation properties, we studied semi-dilute solutions of the cationic surfactants cetylpyridinium chloride (CPyCl) or cetyltrimethylammonium bromide (CTAB) after addition of different amounts of sodium salicylate. The rheological data of these networks of WLMs were systematically compared with the numerically calculated results of the one-mode Giesekus constitutive equation. It turned out that the viscous resistance and the first normal stress difference, measured in steady-state shear flow, start-up, and relaxation experiments, were accurately predicted by the one-mode Giesekus model. In rheological tests, where we applied large oscillating shear amplitudes (LAOS), the transient shear stress could also approximately be described by means of the Giesekus model. The non-linear oscillating first normal stress difference, however, showed large deviations in respect to the theoretical predictions. These discrepancies between different rheological experiments, which we observed in oscillating and stationary flow, pointed to the existence of flow instabilities, which occurred in the LAOS regime. These, more complicated rheological processes, were induced by shear-banding and/or the presence of flow-induced phase transitions, which can occur in oscillatory and stationary shear. The non-linear phenomena, discussed in this article, are of general importance, and they can be equally observed in entangled solutions of flexible macromolecules.

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“…(11)- (14), which we calculated from the Giesekus model coincide quantitatively with the results of Gurnon and Wagner [86]. As Eq.…”

Section: Analytical Solutions For Steady-state Shear Flowsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 98%

Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Rehage

Fuchs

2015

Colloid Polym Sci

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“…Using flow SALS, (Ultra)SAXS or SANS a butterfly pattern is observed in the velocityvorticity plane of flow [17,[24][25][26] accompanied by a similar anisotropy in the velocity-velocity gradient plane [17,26]. Detailed flow-SANS measurements show how these anisotropic structure factors (on length scales corresponding to a few particle diameters) correlate with rheology [17,29]. USAXS and SALS measurements show how these anisotropic microstructures extend to large length scales, beyond hundreds of particle diameters [26], which is consistent with the recent microscopic investigations.…”

Section: Introductionmentioning

confidence: 99%

Superposition rheology and anisotropy in rheological properties of sheared colloidal gels

Colombo

Kim

Schweizer

et al. 2017

Journal of Rheology

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Gelling colloidal suspensions represent an important class of soft materials. Their mechanical response is characterized by a solid-to-liquid transition at a given shear stress level. Moreover, they often exhibit a complex time-dependent rheological behavior known as thixotropy. The viscosity changes find their origin in the microstructure, which depends on flow history. Yet, the structural response of colloidal gels to flow differs fundamentally from most complex fluids, where flow induces orientation. Upon yielding, low to intermediate volume fraction gels break down in a spatially anisotropic way. Bonds in the velocity-velocity gradient plane are broken, whereas microstructural features in other planes are less affected. The subsequent flow-induced microstructural anisotropy is characterized by typical butterfly scattering patterns. However, as yet there was no evidence for the pertinence of this anisotropy for the rheological properties of these systems. In the present work, orthogonal superposition rheometry was first used to evaluate how the flow-induced microstructure affects the viscoelastic properties. It was shown to retain significant elasticity in the velocity-vorticity plane, even when the structure liquefied. Further, the shearinduced mechanical anisotropy was measured using two-dimensional small amplitude oscillatory shear, exploiting the fact that for suitable thixotropic samples the recovery after arresting the flow is relatively slow. It was hence possible to measure the anisotropy of the moduli upon cessation of flow. The mechanical anisotropy was shown to be spectacular, with the storage moduli in perpendicular directions differing by as much as 2 orders of magnitude. V C 2017 The Society of Rheology. [http://dx

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“…Since startup experiments are susceptible to wall slippage [Gurnon et al (2014) b. Shear hysteresis. Shear hysteresis characterizations have been widely studied in gel-like fluids with thixotropic and viscoelastic properties [Bird and Marsh (1968); Divoux et al (2013); Mewis and Wagner (2009);Yoon et al (2014)].…”

Section: Hydrophobic Hncmentioning

confidence: 99%

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Zhao

Haward

Shen

2015

Journal of Rheology

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Determination of characteristic lengths and times for wormlike micelle solutions from rheology using a mesoscopic simulation method Journal of Rheology 59, 903 (2015) AbstractAqueous micellar solutions of cationic surfactant cetyltrimethylammonium bromide (CTAB) and organic hydrotropic salt 3-hydroxy naphthalene-2-carboxylate (SHNC) in the semidilute regime have been characterized by linear and nonlinear rheology, and dynamic light scattering. The strong hydrophobicity and naphthalene structure present in the SHNC induces significant growth of CTAB wormlike micelles and promotes stable micellar network formation. Focusing primarily on 75 mM CTAB/SHNC solution, we correlate the rich rheological behavior with structural transitions of the micellar network under different deformation histories with temperatures in the range of 20 C < T < 40 C. Viscous dissipation dominates at low temperature, while short range interactions among micellar head groups, reorganization of micellar networks play important roles at higher temperatures, leading to complex stress responses under large deformations. The influence of double benzene rings on the response of transient and large amplitude oscillatory shear flows in the system was further elucidated by comparing the rheological behavior of CTAB/SHNC with CTAB/NaSal at the same salt and surfactant concentrations. Our studies distinguished SHNC as a stable hydrotrope in a semidilute cationic surfactant system under thermal variations, with potential applications such as drag reduction and fracturing fluids in oil recovery.

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Spatiotemporal stress and structure evolution in dynamically sheared polymer-like micellar solutions

Cited by 41 publications

References 39 publications

Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Experimental and numerical investigations of the non-linear rheological properties of viscoelastic surfactant solutions: application and failing of the one-mode Giesekus model

Superposition rheology and anisotropy in rheological properties of sheared colloidal gels

Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

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