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The aging of a charged colloidal system has been studied by Small AngleX-rays Scattering, in the exchanged momentum range Q=0.03 - 5 nm-1, and byDynamic Light Scattering, at different clay concentrations (Cw =0.6 % - 2.8 %).The static structure factor, S(Q), has been determined as a function of bothaging time and concentration. This is the first direct experimental evidence ofthe existence and evolution with aging time of two different arrested states ina single system simply obtained only by changing its volume fraction: aninhomogeneous state is reached at low concentrations, while a homogenous one isfound at high concentrations.

Arrested state of clay-water suspensions: gel or glass?