caa a22 4500 605466572 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00397-015-0865-8 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0865-8 Large amplitude oscillatory shear (LAOS) in model colloidal suspensions and glasses: frequency dependence [Elektronische Daten] [Andreas Poulos, Frédéric Renou, Alan Jacob, Nick Koumakis, George Petekidis] We investigate the effect of frequency on the non-linear large amplitude oscillatory shear (LAOS) response of concentrated colloidal suspensions of model soft and hard spheres at various concentrations, both below and above the glass transition. We show that the anharmonic response in the stress increases with frequency for liquid-like samples but decreases with frequency for solid-like samples. We argue that for samples below the glass transition, higher frequencies involving higher maximum shear rates promote shear thinning and increase anharmonicity. On the other hand, solid-like samples deform plastically at low frequencies as they are subjected to low shear rates within the period. Higher frequencies (higher average shear rates) lead to viscous flow over a larger fraction of the period thereby decreasing anharmonic behavior. We also demonstrate that LAOS experiments in strain-controlled rheometry at moderately high frequencies (ω > 5rad/s) have to be very carefully interpreted, due to the superharmonic instrumental resonance effects. Springer-Verlag Berlin Heidelberg, 2015 Rheology nationallicence Colloids nationallicence Large amplitude oscillatory shear nationallicence Yielding nationallicence Glass transition nationallicence Poulos Andreas Forschungszentrum Jülich, JCNS-1/ICS-1, 52428, Jülich, Germany aut Renou Frédéric URCOM, EA 3221, FR CNRS 3038, University of Le Havre, 25 rue Philippe Lebon, B.P. 1123, 76063, Le Havre, France aut Jacob Alan IESL-FORTH and Department of Materials Science, University of Crete, Heraklion, Greece aut Koumakis Nick CNR-IPCF Dipartimento di Fisica, Università di Roma "La Sapienza”, Rome, Italy aut Petekidis George IESL-FORTH and Department of Materials Science, University of Crete, Heraklion, Greece aut Rheologica Acta Springer Berlin Heidelberg 54/8(2015-08-01), 715-724 0035-4511 54:8<715 2015 54 397 https://doi.org/10.1007/s00397-015-0865-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0865-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Poulos Andreas Forschungszentrum Jülich, JCNS-1/ICS-1, 52428, Jülich, Germany aut NATIONALLICENCE 700 1- Renou Frédéric URCOM, EA 3221, FR CNRS 3038, University of Le Havre, 25 rue Philippe Lebon, B.P. 1123, 76063, Le Havre, France aut NATIONALLICENCE 700 1- Jacob Alan IESL-FORTH and Department of Materials Science, University of Crete, Heraklion, Greece aut NATIONALLICENCE 700 1- Koumakis Nick CNR-IPCF Dipartimento di Fisica, Università di Roma "La Sapienza”, Rome, Italy aut NATIONALLICENCE 700 1- Petekidis George IESL-FORTH and Department of Materials Science, University of Crete, Heraklion, Greece aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/8(2015-08-01), 715-724 0035-4511 54:8<715 2015 54 397