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Absorption of scattered light in colloidal systems of aggregated particles

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Abstract

Scattering and extinction of colloidal systems containing either nonabsorbing or strongly absorbing spherical particles of some nanometers in diameter were examined in the wavelength range from the near UV to the near IR. If aggregation occurs, scattering and extinction are modified with respect to the single sphere systems. The influence of aggregation can best be recognized for absorbing particles when already the single sphere shows resonant extinction. In this case, the resonance of the single sphere splits into many new resonances for the aggregate, most of which are positioned at larger wavelengths than the single sphere resonance. They strongly depend on the size and shape of the aggregate.

Looking at the scattering, additional problems arise in systems of absorbing particles caused by reabsorption by neighboring spheres or aggregates. A simple model was developed to interpret the obtained scattering data.

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Authors and Affiliations

  1. Physikalisches Institut, RWTH Aachen, 52056, Aachen, FRG

    M. Quinten

  2. Forschungszentrum Juelich ICG-3, Postfach 1913, 52425, Jülich, FRG

    J. Stier

Authors
  1. M. Quinten
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  2. J. Stier
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Quinten, M., Stier, J. Absorption of scattered light in colloidal systems of aggregated particles. Colloid Polym Sci 273, 233–241 (1995). https://doi.org/10.1007/BF00657829

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  • DOI: https://doi.org/10.1007/BF00657829

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