Investigation of sheared liquids by neutron backscattering and reflectivity

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Magerl A, Hock R
Zeitschrift: Applied Physics A-Materials Science & Processing
Verlag: Springer Verlag (Germany)
Jahr der Veröffentlichung: 2002
Band: A
Seitenbereich: ????
ISSN: 0947-8396


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 (IN 10 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.



FAU-Autoren / FAU-Herausgeber

Hock, Rainer Prof. Dr.
Professur für Kristallographie und Strukturphysik
Magerl, Andreas Prof. Dr.
Lehrstuhl für Kristallographie und Strukturphysik

Zuletzt aktualisiert 2018-09-08 um 06:38