Emulsion is a widespread material encountered in various field like food, cosmetics or pharmaceutical industries and even biotechnologies. Emulsions are primarily a heterogeneous mixture of two immiscible liquids with surfactants in the form of droplets dispersed in a continuous phase. Microfluidic technology offers now an efficient tool for producing calibrated emulsion droplets. Along that line, the laboratory has developed a new microfluidic system allowing mass production of highly calibrated emulsion droplets. For this project, we wish to take advantage of this capability and to further extend the use of microfabricated systems to investigate stability of model emulsions. The main objective of the internship is to explore the emulsion stability in dedicated microfluidic systems as a function of the formulation, i.e. related to surfactant nature, oil type and aqueous phase properties like ionic strength for example. We will focus on the stability against coalescence, when the droplets merge. This phenomenon is linked to the physicochemical features of the thin film between droplets where surfactants are adsorbed as well as the constraint imposed to the emulsion and thus to the thin films, like compression or shear. The fate of concentrated emulsions under compression and shear will be investigated.