Investigation of sheared liquids by neutron backscattering and reflectivity View Full Text


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Article Info

DATE

2002-12

AUTHORS

M. Wolff, A. Magerl, R. Hock, B. Frick, H. Zabel

ABSTRACT

We have investigated by neutron scattering structural and dynamical properties of water solutions of the triblock copolymer P85 under shear. To this end a shear cell that suits the requirements for neutron backscattering and another for reflectivity experiments have been built. In reflectivity measurements we find the polymer concentration (nominal concentration of 33% by weight) to vary right at the surface between 12% and 52% for hydrophilic or hydrophobic coated silicon wavers, for temperatures between 18 °C and 73 °C and for shear rates up to 2500 s-1. Additional structural changes deeper in the bulk are also observed. On the backscattering instrument (IN10 at ILL) we find that the liquid appears to stick to the plates of the shear cell, implying an unusual macroscopic velocity distribution that differs from that found earlier for lubrication oils. We report further on changes of the quasielastic line width in the direction of the shear gradient for different temperatures and shear rates. More... »

PAGES

s374-s376

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003390201885

DOI

http://dx.doi.org/10.1007/s003390201885

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032975200


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