Kinetics of colloidal fractal aggregation by differential dynamic microscopy |
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| Authors: | F. Ferri A. D’Angelo M. Lee A. Lotti M. C. Pigazzini K. Singh R. Cerbino |
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| Affiliation: | (1) Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia;(2) Belarusian State University, Minsk, Belarus;(3) Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia; |
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| Abstract: | We study the kinetics of an aggregation process induced by adding salt to a stable colloidal suspension of 73 nm (diameter) particles. Despite the subdiffraction size of the colloidal particles, the process is monitored via optical microscopy, which is used here to obtain time-resolved scattering information about the colloidal aggregates. The radius of the aggregates is determined as a function of time and their fractal dimension is extracted. Our results are compatible with a diffusion limited aggregation process, as independently confirmed by spectral turbidimetry measurements on the same sample. |
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