Title
Timeresolved Investigation of Aggregation and Gelation of Colloids: Timeresolved Investigation of Aggregation and SolGel Tran,Used
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In this work we present a study of the aggregation and solgel transition of colloidal suspensions using a wide range of experimental techniques. We investigate in the first part of this work a model system which undergoes a solgel transition in the hope to gain further insight into the fundamental process of gelation. Therefore, a colloidal suspension of nano particles (polystyrene spheres) in water is destabilised to induce aggregation of fractal clusters. The clusters will grow until they finally all connect and form a gel. Combining neutron and light scattering, we are able to measure simultaneously and time resolved the static and dynamic properties of the same sample, which allows us to test wellknown theories and to compare our data with recent results of other research groups. Our measurements demonstrate a deviation from classical theories in the critical behavior just before the gel is formed, which we interpret as a glassy cluster phase. The second part of this work describes an experimental setup which is based on a multiple scattering suppression scheme and which allows us to measure even relatively turbid samples faster and with higher precision.
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