2007/11/29 by A. Ragouilliaux, Alexandre Ragouilliaux, Guillaume Ovarlez +5 · 81 citations
Chemical Engineering · Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Colloid #Composite material #Emulsion #Material Dynamics and Properties #Materials science #Organic chemistry #Physics #Pickering emulsions and particle stabilization #Rheology #Rheology and Fluid Dynamics Studies #Rheometry #Shear rate #Shear stress #Stress (linguistics) #Thermodynamics #Thixotropy #Viscosity #Yield (engineering) #cond-mat.soft
paper · pdf · doi:10.1103/physreve.76.051408
published in Physical Review E 76(5), 051408 (American Physical Society) · Published in Physical Review E. http://pre.aps.org/abstract/PRE/v76/i5/e051408
openalex publication_date 2007/11/29 · arxiv created 2010/04/15 · arxiv updated 2010/04/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
From magnetic resonance imaging rheometry we show that a pure emulsion can be turned from a simple yield stress fluid to a thixotropic material by adding a small fraction of colloidal particles. The two fluids have the same behavior in the liquid regime but the loaded emulsion exhibits a critical shear rate below which no steady flows can be observed. For a stress below the yield stress, the pure emulsion abruptly stops flowing, whereas the viscosity of the loaded emulsion continuously increases in time, which leads to an apparent flow stoppage. This phenomenon can be very well represented by a model assuming a progressive increase of the number of droplet links via colloidal particles.