Nanotech 2011

Passive Microrheology : Non Intrusive Measurement of the Emulsions Stability

C. Tisserand, M. Fleury, L. Brunel, P. Bru, G. Meunier
Formulaction, FR

Keywords: stability, emulsion, suspensions, collapse, microrheology, floculation, polymer

Abstract:

This work presents a new technique of the passive microrheology for the study of the microstructure properties of soft materials like emulsions. Our technology uses Multi Speckle DWS (MS-DWS) set-up in backscattering with a video camera. It allows to measure the mean displacement of the microstructure particles in a spatial range between 0,1 and 100 nm and a time scale between 10-1 and 105 seconds. Different parameters can be measured or obtained directly from the Mean Square Displacement (MSD) curve like a fluidity index, an elasticity factor, a viscosity factor, a relaxation time, a MSD slope. This technique allows to monitor the evolution of the microstructure, the restructuration after shearing, the variation of the viscoelastic properties versus temperature, pH, the physical stability of emulsion or suspension... This work focuses on the measurement of viscoelastic properties evolution of emulsions to follow their stability. The results will show the advantages of using a non intrusive method to detect nascent destabilisation of the microstructure before rheology or visual method. References : M. Bellour, M. Skouri, J.-P. Munch, and P. Hébraud, ”Brownian motion of particles embedded in a solution of giant micelles” in The European Physical Journal E, Eur. Phys. J. E 8, 431–436 (2002) M.L. Gardel, M.T. Valentine and D.A. Weitz, “1 Microrheology“, Department of Physics and Division of Engineering and Applied Sciences,Harvard University, Cambridge MA 02138
 

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