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Kinetics of colloidal fractal aggregation by differential dynamic microscopy

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Ferri, F., D'Angelo, A., Lee, M., Lotti, A., Pigazzini, M. C., Singh, K., et al. (2011). Kinetics of colloidal fractal aggregation by differential dynamic microscopy. EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, 199(1), 139-148. doi:10.1140/epjst/e2011-01509-9.


Cite as: http://hdl.handle.net/21.11116/0000-0004-B7BE-8
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.