Spinodal dynamics in cluster aggregation
نویسندگان
چکیده
We report small angle static light scattering measurements on colloidal aggregation at high monomer volun~e fractions. The structure factor S(q) exhibits a pronounced ma-ximum at a finite wave vector q, at any stage during the aggregation reaction. In the later stages the structure factor scales according to a universal law similar to that of spinodai decomposition dynamics: S(q/q , ) = q ; d ~ ( q / q m ) . At variance with spinodal decomposition, where d = 3, we find d = df, the fractal dimension of colloidal clusters.' The aggregation stops when the peak position reaches a certain value q* which depends on the monomer concentration. The terminal stage occurs when all the sample is filled with close packing fractal clusters of size R oc l / q *
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