Light Scattering Experiments on Shear Induced Structures of Micellar Solutions

Prötzl, Brigitte; Springer, Jürgen

doi:10.1006/jcis.1997.4866

Cited by 25 publications

(23 citation statements)

References 24 publications

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“…Electrostatic structure factors were observed on salt-free solutions of C 14 DMAO/SDS [85], gemini 12-2-12 [88,90] and CTAT [75,79,108]. During the last two decades, neutron [54,56,75,76,79,85,88,90,103,108] and light [87,91,92,93,106,107] scattering under shear were performed repeatedly on dilute thickening systems. As early as in 1986, Bewersdorff and coworkers set up a Couette cell on a neutron spectrometer in order to detect the anisotropy of the scattering induced by the shearing [54].…”

Section: Ii41 Small-angle Scattering Under Shearmentioning

confidence: 99%

“…(*) For the system hexadecyltrimethylammonium p-toluenesulfonate without monovalent counterions, the notation CTAT is prefered to C 16 TAB/Tos. (a) [51,52,58], (b) [54,55,56,59,60,61], (c) [55,60,62,63,64,65,66,67,68,69,70,71,72,73,74], (d) [68,71,75,76,77,78,79,80,81,82], (e) [83,84], (f) [61], (g) [85,86,87], (h) [88,89,90,91,92,93,94,95], (i) [57,96,97,…”

Section: Ii1 Introductionmentioning

confidence: 99%

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Shear-Induced Transitions and Instabilities in Surfactant Wormlike Micelles

Lerouge

Berret

2009

Polymer Characterization

147

153

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In this review, we report recent developments on the shear-induced transitions and instabilities found in surfactant wormlike micelles. The survey focuses on the nonlinear shear rheology and covers a broad range of surfactant concentrations, from the dilute to the liquid-crystalline states and including the semidilute and concentrated regimes. Based on a systematic analysis of many surfactant systems, the present approach aims to identify the essential features of the transitions. It is suggested that these features define classes of behaviors. The review describes three types of transitions and/or instabilities: the shear-thickening found in the dilute regime, the shear-banding which is linked in some systems to the isotropic-tonematic transition, and the flow-aligning and tumbling instabilities characteristic of nematic structures. In these three classes of behaviors, the shear-induced transitions are the result of a coupling between the internal structure of the fluid and the flow, resulting in a new mesoscopic organization under shear. This survey finally highlights the potential use of wormlike micelles as model systems for complex fluids and for applications.

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Section: Ii41 Small-angle Scattering Under Shearmentioning

confidence: 99%

Section: Ii1 Introductionmentioning

confidence: 99%

Shear-Induced Transitions and Instabilities in Surfactant Wormlike Micelles

Lerouge

Berret

2009

Polymer Characterization

147

153

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“…Using light scattering experiments to study the shear thickening regime, Prötzl and Springer (1997) showed that SIS formation can be divided into three consecutive stages, namely, induction, aggregation, and orientation of micelles. With the same technique, Hu et al (1998) attributed the origin of the shear thickening regime specically to heterogenous nucleation of SIS because of the presence of impurities and/or surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Self-similar shear thickening behavior in CTAB/NaSal surfactant solutions

Vasudevan

Shen

Khomami

et al. 2008

Journal of Rheology

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The eect of salt concentration C s on the critical shear rateγ c required for the onset of shear thickening and apparent relaxation time λ of the shear-thickened phase, has been investigated systematically for dilute CTAB/NaSal solutions. Experimental data suggest a self-similar behavior ofγ c and λ as functions of C s . Specically,γ c ∼ C s −6 whereas λ ∼ C s 6 such that an eective Weissenberg number We ≡ λγ for the onset of the shear thickened phase is only weakly dependent on C s . A procedure has been developed to collapse the apparent shear viscosity versus shear rate data obtained for various values of C s into a single master curve. The eect of C s on the elastic modulus and mesh size of the shear-induced gel phase for dierent surfactant concentrations is discussed.Experiments performed using dierent ow cells (Couette and cone-and-plate) show thatγ c , λ and the maximum viscosity attained are geometry-independent. The elastic modulus of the gel phase inferred indirectly by employing simplied hydrodynamic instability analysis of a sheared gel-uid interface is in qualitative agreement with that predicted for an entangled phase of living polymers. A qualitative mechanism that combines the eect of C s on average micelle length and Debye parameter with shearinduced congurational changes of rod-like micelles is proposed to rationalize the selfsimilarity of SIS formation.

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“…The rheological behavior of shear thickening micellar solutions has been studied under shear and extension by using rheometry [9][10][11][12], birefringence [13][14][15][16], light and neutron scattering [17][18][19][20], as well as velocimetry [8,[21][22][23][24]. However, there has been comparatively little research on their electrorheological properties [4,25].…”

Section: Introductionmentioning

confidence: 98%