Suspensions of colloidal aggregates are important in various industrial and biomedical applications. These aggregates, which show fractal aggregation characteristics, can grow until they fill the entire volume and form a gel. Dynamic Light Scattering (DLS) and Small Angle Light Scattering (SALS) were used to study the gelation of 20nm polystyrene spheres destabilized by various concentrations of MgCl<sub>2. </sub>The dynamic structure factor of the fractal colloidal gel exhibits stretched exponential behavior. The aggregates show a fractal dimension of ~1.75, which is in agreement with Diffusion Limited Cluster aggregation.

Study of fractal colloidal gels using DLS and SALS

249th National Meeting (2015)

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