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The elastic properties of a soft matter material can be greatly altered bythe presence of solid inclusions whose microscopic properties, such as theirsize and interactions, can have a dramatic effect. In order to shed light onthese effects we use extensive rheology computer simulations to investigatecolloidal gels with solid inclusions of different size. We show that theelastic properties vary in a highly non trivial way as consequence of theinteractions between the gel backbone and the inclusions. In particular, weshow that the key aspects are the presence of the gel backbone and itsmechanical alteration originated by the inclusions. To confirm our observationsand their generality, we performed experiments on an emulsion that presentsstrong analogies with colloidal gels and confirms the trends observed in thesimulations.

Stiffening attractive suspensions with solid inclusions or granularity effect in loaded colloidal gels