Flow birefringence, stress optical rule and rheology of four micellar solutions with the same low shear viscosity

Decruppe, J. P.; Ponton, Alain

doi:10.1140/epje/i2002-10108-y

Cited by 31 publications

(47 citation statements)

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“…This study suggests that transient extensional rheology might be suitable to distinguish between branched and linear micelles. Other mechanical techniques are so far not available for differentiating branched WLM solutions from linear entangled micelle solutions [Decruppe and Ponton (2003)]. Also in neutron or light scattering experiments, linear micelles and branched micelles show similar behavior.…”

Section: Elongational Flow Of Wlm Solutionsmentioning

confidence: 99%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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We have investigated the uniaxial elongation behavior of six different wormlike micelle systems covering a broad range of surfactant concentrations cs and salt/surfactant ratios R using the capillary breakup elongational rheometry (CaBER). In the fast-breaking limit (high cs and R), filament lifetime tfil is controlled by the equilibrium shear modulus G0 and the breakage time λbr obtained from small oscillatory shear according to tfil/G0∝λbr2/3 and relaxation time ratios λe/λs≈1 are found. When reptation dominates (high cs, low R) λe/λs<1 is observed similar as for solutions of covalently bound polymers. In this concentration regime, the micellar structure seems not to be affected by the strong elongational flow. In contrast, high filament lifetimes up to 1000 s and λe/λs values up to 10 are observed at low cs irrespective of R. This indicates the formation of elongation-induced structures (EISs). A minimum viscosity and a minimum initial diameter are required for creating EIS. Additional filament stretching experiments indicate that a critical total deformation has to be exceeded for structure build-up. Finally, our experiments reveal a distinct difference regarding the dependence between solutions of linear and branched micelles of filament lifetime on viscosity suggesting that CaBER is a versatile means to distinguish between these structures.

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Section: Elongational Flow Of Wlm Solutionsmentioning

confidence: 99%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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show abstract

“…Typically, the stress optical rule holds at shear rates below which the onset of (2008) a rate dependent viscosity occurs. However, it often fails at stresses on the order of the stress plateau for the shear-banding fluids, and for stresses near the onset of shear-thinning for the shear-thinning fluids [Decruppe & Ponton (2003)]. In the CTAB:NaNO 3 system deviations between the predictions of the stress optical rule and experimental results were attributed to a deviation from Gaussian chain statistics for large deformation rates [Lerouge et al (2000)].…”

Section: Flow-induced Birefringencementioning

confidence: 99%

Spatially resolved quantitative rheo-optics of complex fluids in a microfluidic device

Ober¹,

Soulages²,

McKinley³

2011

Journal of Rheology

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In this study, we use micro-particle image velocimetry (µ-PIV) and adapt a commercial birefringence microscopy system for making full-field, quantitative measurements of flow-induced birefringence (FIB) for the purpose of microfluidic, opticalrheometry of two worm-like micellar solutions. In combination with conventional rheometric techniques, we use our microfluidic rheometer to study the properties of a shear-banding solution of cetylpyridinium chloride (CPyCl) with sodium salicylate (NaSal) and a nominally shear thinning system of cetyltrimethylammonium bromide (CTAB) with NaSal across many orders of magnitude of deformation rates (10 −2 ≤γ ≤ 10 4 s −1 ). We use µ-PIV to quantify the local kinematics and use the birefringence microscopy system in order to obtain high-resolution measurements of the changes in molecular orientation in the worm-like fluids under strong deformations in a microchannel. The FIB measurements reveal that the CPyCl system exhibits regions of localized, high optical anisotropy indicative of shear bands near the channel walls, whereas the birefringence in the shear-thinning CTAB system varies more smoothly across the width of the channel as the volumetric flow rate is increased. We compare the experimental results to the predictions of a simple constitutive model, and we document the break-down in the stress optical rule as the characteristic rate of deformation is increased.

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“…More recently, rheo-optical techniques were applied with success to the study of wormlike micelles [2,14,117,161,[169][170][171][172]. Experimental set-ups designed for studying complex fluids generally utilize a Couette cell as a shearing device (Figure 14).…”

Section: Flow Birefringencementioning

confidence: 99%

“…Abbreviations of techniques used to show shear banding: "SANS" for small-angle neutron scattering, "FB" for flow birefringence, "NMR" for nuclear magnetic resonance and "DLS" for dynamic light scattering. [3,15,16,127,181,182,[187][188][189]; (b): [64,132,190]; (c): [132,161,191,192]; (d): [116]; (e): [122,159,164]; (f): [122,123,148,163,183,189,193]; (g): [14,172]; (h): [117,124,160,173]; (i): [194,195]; (j): [165,[196][197][198]; (k): [146,[199][200][201][202][203]; (l): [84]; (m): [42]; (n): [134].…”

Section: Shear Banding In Semi-dilute Regimementioning

confidence: 99%

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Rheology of Wormlike Micelles: Equilibrium Properties and Shear Banding Transitions

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We review the experimental and theoretical results obtained during the past decade on the structure and rheology of wormlike micellar solutions. We focus on the linear and nonlinear viscoelasticity and emphasize the analogies with polymers. Based on a comprehensive survey of surfactant systems, the present study shows the existence of standard rheological behaviors for semidilute and concentrated solutions. One feature of this behavior is a shear banding transition associated with a stress plateau in the nonlinear mechanical response. For concentrated solutions, we show that in the plateau region the shear bands are isotropic and nematic.

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Flow birefringence, stress optical rule and rheology of four micellar solutions with the same low shear viscosity

Cited by 31 publications

References 0 publications

Elongational deformation of wormlike micellar solutions

Elongational deformation of wormlike micellar solutions

Spatially resolved quantitative rheo-optics of complex fluids in a microfluidic device

Rheology of Wormlike Micelles: Equilibrium Properties and Shear Banding Transitions

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