Characterisation of multiple emulsions

The above equation can be used to determine the viscosity as a function of shear rate. By following the change in viscosity with time, one can obtain information on multiple emulsion stability. For example, if there is water flow from the external phase to the internal water droplets ( swelling ), the viscosity will increase with time. If, after sometime, the multiple emulsion droplets begin to disintegrate, forming O/W emulsion, the viscosity will drop. 

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