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Kinetics of colloidal fractal aggregation by differential dynamic microscopy

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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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Authors and Affiliations

  1. Dipartimento di Fisica e Matematica, Università degli Studi dell’Insubria, via Valleggio 11, 22100, Como, Italy

    F. Ferri, A. D’Angelo, A. Lotti & M. C. Pigazzini

  2. School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK

    M. Lee

  3. Centre de Physique Théorique, École Polytechnique, Centre National de la Recherche Scientifique, 91128, Palaiseau, France

    A. Lotti

  4. Institut National de la Recherche Scientifique-Énergie, Matériaux et Télécommunications, 1650, boulevard Lionel-Boulet EMT, Varennes, QC, J3X 1S2, Canada

    K. Singh

  5. Dipartimento di Chimica, Biochimica e Biotecnologie per la Medicina, Università degli Studi di Milano, via F.lli Cervi 93, 20090, Segrate, Italy

    R. Cerbino

Authors
  1. F. Ferri
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  2. A. D’Angelo
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  3. M. Lee
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  4. A. Lotti
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  5. M. C. Pigazzini
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  6. K. Singh
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  7. R. Cerbino
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Corresponding author

Correspondence to R. Cerbino.

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Ferri, F., D’Angelo, A., Lee, M. et al. Kinetics of colloidal fractal aggregation by differential dynamic microscopy. Eur. Phys. J. Spec. Top. 199, 139–148 (2011). https://doi.org/10.1140/epjst/e2011-01509-9

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  • DOI: https://doi.org/10.1140/epjst/e2011-01509-9

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