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Larbi Hammadi, Alain Ponton
Rheological investigation of vase of dam: effects of aging time, shear rate and temperature
Appl. Rheol. 27:1 (2017) 14667 (9 pages)
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In this paper we investigate the rheological complex behavior of a vase of Fergoug dam which is located in the region Perregaux
(Western Algeria) as a function of aging time, shear rate, and temperature. The modified Herschel-Bulkley model is used to
fit the stationary flow curves of vase as a function of aging time and the generalized model of Kelvin-Voigt is successfully
applied to fit the creep and recovery data and to analyze the viscoelastic properties of vase as a function of temperature. Finally
the thixotropic behavior studied at constant temperature is analyzed by using the Herschel-Bulkley model including a structural
parameter in order to account for time dependent effect. It is demonstrated that the increase in shear rate induces a restructuring
and reorganization of the particles of the vase at the microstructural level.
► Cite this publication as follows:
Hammadi L, Ponton A: Rheological investigation of vase of dam: effects of aging time, shear rate and temperature, Appl. Rheol. 27 (2017) 14667.
Florentina Talos, Alain Ponton, Berengere Abou, Alexandre Chevillot, Helene Lecoq, Simion Simon
Multiscale viscoelastic investigation of silica-calcium-phosphate sol-gel materials
Appl. Rheol. 25:6 (2015) 63567 (12 pages)
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The sol-gel transition of homogeneous biocomposites synthesized using tetraethyl-orthosilicate alkoxide, calcium nitrate
tetrahydrate and di-ammonium hydrogen phosphate salts as reagents are investigated at the macroscopic scale by small
amplitude oscillatory shear measurements and probed locally by passive microrheology at 37 C. Structural evolutions during
the sol-gel transition are studied by using Fourier Transform Infrared (FT-IR) analysis. The Young's modulus of the aged gels is
measured as a function of time, at room temperature. Moreover the materials are dried, thermally treated and characterized
by laser scattering analysis and X-ray diffraction to obtain the particle size distribution and crystallite size respectively and
to observe the morphology by Scanning Electron Microscopy.
► Cite this publication as follows:
Talos F, Ponton A, Abou B, Chevillot A, Lecoq H, Simon S: Multiscale viscoelastic investigation of silica-calcium-phosphate sol-gel materials, Appl. Rheol. 25 (2015) 63567.
Alain Ponton, Claire Meyer, Guillaume Foyart, Luc Aymard, Karim Djellab
Structural and thermomechanical investigation of lyotropic liquid crystal phases doped with monodisperse microparticles
Appl. Rheol. 24:1 (2014) 14147 (7 pages)
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We present a study of the structural and thermomechanical properties of lyotropic phase in the quasi ternary system made
of Cetylpyridinium chloride (CPCl)/hexanol/salt water (0.9% by mass) with and without cobalt microparticles. Phase transition
temperatures of the structural sequence isotropic L1/nematic calamitic Nc,/hexagonal H have been determined by differential
scanning microcalorimetry. Temperature induced developable domains in hexagonal phase H and disclinations in
calamitic nematic phase Nc were observed in crossed polar optical microscopy in confined geometry. A rheological study of
calamitic nematic phase Nc highlighted structuring effect of cobalt microparticles from a concentration of 2% to be demonstrated
by an increase in viscosity and viscoelastic moduli. This could be explained by a stabilization of disclinations.
► Cite this publication as follows:
Ponton A, Meyer C, Foyart G, Aymard L, Djellab K: Structural and thermomechanical investigation of lyotropic liquid crystal phases doped with monodisperse microparticles, Appl. Rheol. 24 (2014) 14147.
M. Guettari, I. Ben Naceur, G. Kassab, A. Ponton, T. Tajouri
Temperature and concentration induced complex behavior in ternary microemulsion
Appl. Rheol. 23:4 (2013) 44966 (7 pages)
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Viscosity measurements were performed in water/AOT (sodium bis(2-ethylhexyl) sulfoccinate)/isooctane microemulsions as
a function of temperature between 25 C and 55 C, molar ratio Wo = water/AOT ranging from 3 to 45 and three values of
AOT/isooctane volume fractions (Φm = 0.1, 0.15, and 0.2). It was shown that microemulsions behaved as Newtonian fluids in
the studied range of shear rate. For a critical molar ratio, Woc,
the corresponding viscosity, ηoc, was shown to be constant with
temperature but dependent on the micellar concentration.
For Wo < Woc, the solutions behaved as simple fluids and the temperature
dependence of viscosity was described by an Arrhenius law. The total activation energy was found to be dependent
on W with a maximum for Wo = 5.
A correlation between the microscopic structure of the reverse micelles and the total activation
energy was proposed. However, a complex fluid behavior was observed for Wo > Woc,
where the viscosity increased
with temperature. For some values of Wo,
the viscosity reached a maximum, which could be explained by attractive interdroplet
interactions and formation of droplet clusters.
► Cite this publication as follows:
Guettari M, BenNaceur I, Kassab G, Ponton A, Tajouri T: Temperature and concentration induced complex behavior in ternary microemulsion, Appl. Rheol. 23 (2013) 44966.
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