Diffusing wave spectroscopy in Maxwellian fluids

Galván-Miyoshi, J.M.; Delgado, Jorge A.; Castillo, Rolando

doi:10.1140/epje/i2007-10335-8

Cited by 63 publications

(122 citation statements)

References 29 publications

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“…The inconsistent results obtained for G'LL are most likely due to some cantilever inhomogeneities or to non-ideal clamping, effects which are not yet taken into account in the model. Nevertheless, except for G'LL, the cantilever-based shear modulus measurements seem to corroborate and extend the Diffusion Wave Spectroscopy reference measurements [33] up to 100 kHz. …”

Section: Use Of Hydrodynamic Force Study For the Measurement Of Fluidsupporting

confidence: 78%

“…An example of characterization of CTAB (CetylTrimethylAmmonium Bromide) with microcantilevers at 19°C is given in Fig. 10, as are measurements made with the same concentration of polymer by Galvan-Miyoshi et al at 22°C [33] and cone-plate measurements made at 19°C. As expected, unlike Newtonian fluids, G' is no longer negligible.…”

Section: Use Of Hydrodynamic Force Study For the Measurement Of Fluidmentioning

confidence: 98%

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Effect of hydrodynamic force on microcantilever vibrations: Applications to liquid-phase chemical sensing

Dufour

Lemaire

Caillard

et al. 2014

Sensors and Actuators B: Chemical

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Abstract:At the microscale, cantilever vibrations depend not only on the microstructure's properties and geometry but also on the properties of the surrounding medium. In fact, when a microcantilever vibrates in a fluid, the fluid offers resistance to the motion of the beam. The study of the influence of the hydrodynamic force on the microcantilever's vibrational spectrum can be used to either (1) optimize the use of microcantilevers for chemical detection in liquid media or (2) extract the mechanical properties of the fluid. The classical method for application (1) in gas is to operate the microcantilever in the dynamic transverse bending mode for chemical detection. However, the performance of microcantilevers excited in this standard out-of-plane dynamic mode drastically decreases in viscous liquid media. When immersed in liquids, in order to limit the decrease of both the resonant frequency and the quality factor, and improve sensitivity in sensing applications, alternative vibration modes that primarily shear the fluid (rather than involving motion normal to the fluid/beam interface) have been studied and tested: these include inplane vibration modes (lateral bending mode and elongation mode). For application (2), the classical method to measure the rheological properties of fluids is to use a rheometer. However, such systems require sampling (no insitu measurements) and a relatively large sample volume (a few milliliters). Moreover, the frequency range is limited to low frequencies (less than 200Hz). To overcome the limitations of this classical method, an alternative method based on the use of silicon microcantilevers is presented. The method, which is based on the use of analytical equations for the hydrodynamic force, permits the measurement of the complex shear modulus of viscoelastic fluids over a wide frequency range.

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Section: Use Of Hydrodynamic Force Study For the Measurement Of Fluidsupporting

confidence: 78%

Section: Use Of Hydrodynamic Force Study For the Measurement Of Fluidmentioning

confidence: 98%

Effect of hydrodynamic force on microcantilever vibrations: Applications to liquid-phase chemical sensing

Dufour

Lemaire

Caillard

et al. 2014

Sensors and Actuators B: Chemical

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“…Fig. 1D shows a SEM image of the FISP formed from precursor 50 (FISP 50 ), exhibiting entangled, branched, and multiconnected networks.…”

Section: Effect Of Salt On Branched Wormlike Micellesmentioning

confidence: 99%

“…However, the resolution of cryo-TEM tends to be decreased due to the vitreous ice layer within the sample. Taking these factors into consideration, we performed both cryo-TEM and TEM microscopy of FISP 50 , as shown in Fig. 3.…”

Section: Effect Of Salt On Branched Wormlike Micellesmentioning

confidence: 99%

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Microstructure and rheology of a flow-induced structured phase in wormlike micellar solutions

Cardiel

Dohnálková

Dubash

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Surfactant molecules can self-assemble into various morphologies under proper combinations of ionic strength, temperature, and flow conditions. At equilibrium, wormlike micelles can transition from entangled to branched and multiconnected structures with increasing salt concentration. Under certain flow conditions, micellar structural transitions follow different trajectories. In this work, we consider the flow of two semidilute wormlike micellar solutions through microposts, focusing on their microstructural and rheological evolutions. Both solutions contain cetyltrimethylammonium bromide and sodium salicylate. One is weakly viscoelastic and shear thickening, whereas the other is strongly viscoelastic and shear thinning. When subjected to strain rates of ∼10 3 s −1 and strains of ∼10 3 , we observe the formation of a stable flow-induced structured phase (FISP), with entangled, branched, and multiconnected micellar bundles, as evidenced by electron microscopy. The high stretching and flow alignment in the microposts enhance the flexibility and lower the bending modulus of the wormlike micelles. As flexible micelles flow through the microposts, it becomes energetically favorable to minimize the number of end caps while concurrently promoting the formation of cross-links. The presence of spatial confinement and extensional flow also enhances entropic fluctuations, lowering the energy barrier between states, thus increasing transition frequencies between states and enabling FISP formation. Whereas the rheological properties (zero-shear viscosity, plateau modulus, and stress relaxation time) of the shear-thickening precursor are smaller than those of the FISP, those of the shear-thinning precursor are several times larger than those of the FISP. This rheological property variation stems from differences in the structural evolution from the precursor to the FISP. microfluidics | microrheology | mesh size S urfactant molecules in aqueous solutions can self-assemble into different structures, such as spherical micelles, cylindrical micelles, lamellar phases, and vesicles (1). The morphology of these self-assembled structures is influenced by surfactant concentration, temperature, external additives (e.g., cosurfactants or salts), and flow conditions. Cylindrical micelles in the presence of inorganic or organic salts can self-assemble into large, flexible, and elongated wormlike micelles that exhibit viscoelastic properties (2-4). The ionic strength of the salt screens the electrostatic repulsions between the charged surfactant head groups, promoting cylindrical micellar growth (1-3). At higher salt concentrations, the entangled linear micelles can transition to branched and multiconnected micellar networks, as evidenced by rheological measurements, light scattering techniques, and electron microcopy (EM) imaging (5-18). Additionally, wormlike micellar solutions are known to exhibit a variety of interesting phenomena, some of which are shear banding (19-21), shear thickening (22, 23), shear-induced transitions and insta...

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Quantitative modeling of threadlike micellar solution rheology

Tan

Larson

2022

Rheol Acta

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Diffusing wave spectroscopy in Maxwellian fluids

Cited by 63 publications

References 29 publications

Effect of hydrodynamic force on microcantilever vibrations: Applications to liquid-phase chemical sensing

Effect of hydrodynamic force on microcantilever vibrations: Applications to liquid-phase chemical sensing

Microstructure and rheology of a flow-induced structured phase in wormlike micellar solutions

Quantitative modeling of threadlike micellar solution rheology

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