Instabilities of micellar systems under homogeneous and non-homogeneous flow conditions

Arturo F. Méndez-Sánchez, M. Rosario López-González, V. Hugo Rolón-Garrido, José Pérez-González, Lourdes de Vargas

Research output: Contribution to journalArticleResearchpeer-review

45 Citations (Scopus)

Abstract

The rheological behavior of a cetylpyridinium chloride 100 mmol 1-1/sodium salicylate 60 mmol 1-1 aqueous solution was studied in this work under homogeneous (cone and plate) and nonhomogeneous flow conditions (vane-bob and capillary rheometers), respectively. Instabilities consistent with non-monotonic flow curves were observed in all cases and the solution exhibited similar behavior under the different flow conditions. Hysteresis and the sigmoidal flow curve suggested as characteristic of systems that show constitutive instabilities were observed when running cycles of increasing and decreasing stress or shear rate, respectively. This information, together with a detailed determination of steady states at shear stresses close to the onset of the instabilities, allowed one to show unequivocally that "top and bottom jumping" are the mechanisms to trigger the instabilities in this micellar system. It is shown in addition that there is not a true plateau region in between the "top and bottom jumping". Finally, the flow behavior beyond the upturn seemed to be unstable and was found accompanied by an apparent violation of the no-slip boundary condition.
Original languageAmerican English
Pages (from-to)56-63
Number of pages49
JournalRheologica Acta
DOIs
StatePublished - 1 Jan 2003
Externally publishedYes

Fingerprint

Cetylpyridinium
Sodium Salicylate
sodium salicylates
Rheometers
vanes
rheometers
Shear deformation
Hysteresis
Cones
Shear stress
curves
Sodium
shear stress
Boundary conditions
plateaus
cones
slip
actuators
chlorides
hysteresis

Cite this

Méndez-Sánchez, Arturo F. ; López-González, M. Rosario ; Rolón-Garrido, V. Hugo ; Pérez-González, José ; de Vargas, Lourdes. / Instabilities of micellar systems under homogeneous and non-homogeneous flow conditions. In: Rheologica Acta. 2003 ; pp. 56-63.
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abstract = "The rheological behavior of a cetylpyridinium chloride 100 mmol 1-1/sodium salicylate 60 mmol 1-1 aqueous solution was studied in this work under homogeneous (cone and plate) and nonhomogeneous flow conditions (vane-bob and capillary rheometers), respectively. Instabilities consistent with non-monotonic flow curves were observed in all cases and the solution exhibited similar behavior under the different flow conditions. Hysteresis and the sigmoidal flow curve suggested as characteristic of systems that show constitutive instabilities were observed when running cycles of increasing and decreasing stress or shear rate, respectively. This information, together with a detailed determination of steady states at shear stresses close to the onset of the instabilities, allowed one to show unequivocally that {"}top and bottom jumping{"} are the mechanisms to trigger the instabilities in this micellar system. It is shown in addition that there is not a true plateau region in between the {"}top and bottom jumping{"}. Finally, the flow behavior beyond the upturn seemed to be unstable and was found accompanied by an apparent violation of the no-slip boundary condition.",
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Instabilities of micellar systems under homogeneous and non-homogeneous flow conditions. / Méndez-Sánchez, Arturo F.; López-González, M. Rosario; Rolón-Garrido, V. Hugo; Pérez-González, José; de Vargas, Lourdes.

In: Rheologica Acta, 01.01.2003, p. 56-63.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Méndez-Sánchez, Arturo F.

AU - López-González, M. Rosario

AU - Rolón-Garrido, V. Hugo

AU - Pérez-González, José

AU - de Vargas, Lourdes

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AB - The rheological behavior of a cetylpyridinium chloride 100 mmol 1-1/sodium salicylate 60 mmol 1-1 aqueous solution was studied in this work under homogeneous (cone and plate) and nonhomogeneous flow conditions (vane-bob and capillary rheometers), respectively. Instabilities consistent with non-monotonic flow curves were observed in all cases and the solution exhibited similar behavior under the different flow conditions. Hysteresis and the sigmoidal flow curve suggested as characteristic of systems that show constitutive instabilities were observed when running cycles of increasing and decreasing stress or shear rate, respectively. This information, together with a detailed determination of steady states at shear stresses close to the onset of the instabilities, allowed one to show unequivocally that "top and bottom jumping" are the mechanisms to trigger the instabilities in this micellar system. It is shown in addition that there is not a true plateau region in between the "top and bottom jumping". Finally, the flow behavior beyond the upturn seemed to be unstable and was found accompanied by an apparent violation of the no-slip boundary condition.

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