Percolation and critical exponents for the viscosity of microemulsions

Saidi, Z.; Mathew, C.T.; Peyrelasse, J.; Boned, Christian

doi:10.1103/physreva.42.872

Cited by 46 publications

(27 citation statements)

References 24 publications

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“…The o s η behaviour in dilute and semidilute regime resembles that already seen in other C i E j solutions 5,10,13,14 and microemulsions 15,16,17 . In the latter it was interpreted on the ground of percolation processes and, in analogy, we tried to describe our data according to the scaling relations of the asymptotic behaviour of o At high concentration (from 65 to 100 wt%) the viscosity exhibits a different trend, i.e.…”

Section: A Viscositysupporting

confidence: 78%

Shear and Longitudinal Viscosity of Non-ionic C₁₂E₈ Aqueous Solutions

D’Arrigo¹,

Briganti²,

Maccarini³

2006

J. Phys. Chem. B

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We present an extensive set of measurements of steady shear viscosity (η°s), longitudinal elastic modulus (M') and ultrasonic absorption (α) in the one-phase isotropic liquid region of the nonionic surfactant C 12 E 8 aqueous solutions. Within a given temperature interval, this phase extends along the entire surfactant concentration range, that could be fully covered in the experiments. In agreement with previous studies, the overall results support the presence of two separated intervals of concentration corresponding to different structural properties. In the surfactant-rich region the temperature dependence of η°s follows an equation characteristic of glass-like systems. The ultrasonic absorption spectra show unambiguous evidence of viscoelastic behaviour that can be described by a ColeCole relaxation formula. In this region, when both the absorption and the frequency are scaled by the static shear viscosity (η°s), the scaled attenuation reduces to a single universal curve for all temperatures and concentrations. In the water-rich region the behaviour of η°s, M' and α are more complex and reflect the presence of dispersed aggregates whose size increases with temperature and concentration. At these concentrations the ultrasonic spectra are characterized by a multiple decay rate. The high frequency tail falls in the same frequency range seen at high surfactant content and exhibits similar behaviors. This contribution is ascribed to the mixture of hydrophilic terminations and water present at the micellar interfaces that resembles the condition of a concentrated polymer solution. An additional low frequency contribution is also observed, which is ascribed to the exchange of water molecules and/or surfactant monomers between the aggregates and the bulk solvent region.

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Section: A Viscositysupporting

confidence: 78%

Shear and Longitudinal Viscosity of Non-ionic C₁₂E₈ Aqueous Solutions

D’Arrigo¹,

Briganti²,

Maccarini³

2006

J. Phys. Chem. B

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“…Attempts have been made to formulate and characterize water-free microemulsions, 70,71,72,73 for example by replacing water with ethylene glycerol 74 , glycol or formamide. 75 In recent years, progress has been made by formulating nonaqueous microemulsions with Ionic Liquids.…”

Section: Definitionmentioning

confidence: 99%

“…Boned and coworkers replaced water by glycerol in a microemulsion consisting of AOT, water and isooctane. 74 In that case the condition was fulfilled as η oil << η glycerol . They found that the critical exponents obtained from viscosity measurements are very close to those obtained from conductivity measurements.…”

mentioning

confidence: 99%

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Zech¹,

Thomaier²,

Kolodziejski³

et al. 2010

Chemistry A European J

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“…The global viscosity maxima at R= 0.3 coincides with the formation of a bicontinuous microstructure, characterized by sample spanning, interpenetrating oil and water channels. In the past, both shear thinning (Saidi et al, 1990) and Newtonian flow behavior (Blom & Mellema, 1988;Peyerlasse et al, 1988;Saidi et al, 1990) was observed for bicontinuous structures at R = 0.3-0.5. However, most reports point to a Newtonian behaviour indicating that there could be occurrence of different microstructures other than bicontinuous for the R values indicated above.…”

Section: Viscosity Changes Across the 1- Channel At 28 ºCmentioning

confidence: 99%