Transition from a simple yield stress fluid to a thixotropic material

Details Transition from a simple yield stress fluid to a thixotropic material Transition from a simple yield stress fluid to a thixotropic material

2010-04-15

arxiv.org/abs/1004.2655v1

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 76 (2007) 051408

Physics

Condensed Matter

Soft Condensed Matter

Published in Physical Review E. http://pre.aps.org/abstract/PRE/v76/i5/e051408

Scientific paper

10.1103/PhysRevE.76.051408

From MRI 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.

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