Time-resolved small-angle neutron scattering study of shear-thickening surfactant solutions after the cessation of flow

R. Oda; V. Weber; P. Lindner; D. J. Pine; E. Mendes; F. Schosseler

doi:10.1021/la9913811

Time-resolved small-angle neutron scattering study of shear-thickening surfactant solutions after the cessation of flow

R. Oda, V. Weber, P. Lindner, D. J. Pine, E. Mendes, F. Schosseler

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Shear effects in dilute solutions of gemini surfactant solutions are studied by SANS in the shear-thickening regime. After the cessation of flow, the local anisotropy relaxes in about 10² s and we find evidence for a shear-induced change in the structure of the solutions that is stable for at least a few hours. The results can be understood if the shear-induced viscous phase is a loosely connected network of long-lived aggregates with typical size of 1 μm. Counterions-mediated attraction between rodlike micelles could explain the formation of the aggregates and their long lifetime. The whole picture is consistent with previous results obtained for the same system using different techniques.

Original language	English (US)
Pages (from-to)	4859-4863
Number of pages	5
Journal	Langmuir
Volume	16
Issue number	11
DOIs	https://doi.org/10.1021/la9913811
State	Published - May 30 2000

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la9913811

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abstract = "Shear effects in dilute solutions of gemini surfactant solutions are studied by SANS in the shear-thickening regime. After the cessation of flow, the local anisotropy relaxes in about 102 s and we find evidence for a shear-induced change in the structure of the solutions that is stable for at least a few hours. The results can be understood if the shear-induced viscous phase is a loosely connected network of long-lived aggregates with typical size of 1 μm. Counterions-mediated attraction between rodlike micelles could explain the formation of the aggregates and their long lifetime. The whole picture is consistent with previous results obtained for the same system using different techniques.",

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T1 - Time-resolved small-angle neutron scattering study of shear-thickening surfactant solutions after the cessation of flow

AU - Oda, R.

AU - Weber, V.

AU - Lindner, P.

AU - Pine, D. J.

AU - Mendes, E.

AU - Schosseler, F.

PY - 2000/5/30

Y1 - 2000/5/30

N2 - Shear effects in dilute solutions of gemini surfactant solutions are studied by SANS in the shear-thickening regime. After the cessation of flow, the local anisotropy relaxes in about 102 s and we find evidence for a shear-induced change in the structure of the solutions that is stable for at least a few hours. The results can be understood if the shear-induced viscous phase is a loosely connected network of long-lived aggregates with typical size of 1 μm. Counterions-mediated attraction between rodlike micelles could explain the formation of the aggregates and their long lifetime. The whole picture is consistent with previous results obtained for the same system using different techniques.

AB - Shear effects in dilute solutions of gemini surfactant solutions are studied by SANS in the shear-thickening regime. After the cessation of flow, the local anisotropy relaxes in about 102 s and we find evidence for a shear-induced change in the structure of the solutions that is stable for at least a few hours. The results can be understood if the shear-induced viscous phase is a loosely connected network of long-lived aggregates with typical size of 1 μm. Counterions-mediated attraction between rodlike micelles could explain the formation of the aggregates and their long lifetime. The whole picture is consistent with previous results obtained for the same system using different techniques.

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Time-resolved small-angle neutron scattering study of shear-thickening surfactant solutions after the cessation of flow

Abstract

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