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Structure, Rheology, and Relaxation Of Concentrated Emulsions
[2017/04/13]
Structure, Rheology, and Relaxation Of Concentrated Emulsions

    We employ a home-made Rheo-LS apparatus combining rheological (Rheo) and light scattering (LS) measurements to study shear-induced restructuring and rheology of concentrated monodisperse emulsions. The emulsions are subjected to large-amplitude oscillatory shear of variable amplitude and frequency. The LS data reflect droplet deformation as well as shear history-dependent inter-droplet structures. The rheological measurements display pseudoplasticity near zero shear rate and shear-thinning behavior at finite shear rates. The time-resolved and synchronous Rheo-LS measurements reveal detailed information about the complex structure-rheology relationship of emulsions. Shear disorders the droplets at low and high shear rates but induces order at medium shear rates. The apparent viscosity increases as the degree of inter-droplet order decreases. Indicated in the LS patterns, the relaxation of the emulsion subjected to a step-strain exhibits two (fast and slow) characteristic times.

 

Time: 3:10 PM, 14th Apr 2017

93456, 4F, Dept. Chem. Eng.


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