Interparticle attraction controls flow heterogeneity in calcite gels. Issue 40 (14th September 2020) - Liberto, Teresa
Abstract : Increasing interparticle attraction in calcite colloidal gels leads to flow heterogeneities including shear bands and temporal fluctuations. Abstract : We couple rheometry and ultrasonic velocimetry to study experimentally the flow behavior of gels of colloidal calcite particles dispersed in water, while tuning the strength of the interparticle attraction through physico-chemistry. We unveil, for the first time in a colloidal gel, a direct connection between attractive interactions and the occurrence of shear bands, as well as stress fluctuations.