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Journal of Chemical Physics / Volume 123 / Issue 6 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 123, 064709 (2005); http://dx.doi.org/10.1063/1.1996570 (8 pages)

Light-scattering form factors of asymmetric particle dimers from heteroaggregation experiments

Paolo Galletto1, Wei Lin1, Michael I. Mishchenko2, and Michal Borkovec1

1Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, 1211 Geneva 4, Switzerland
2National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies, 2880 Broadway, New York, New York 10025

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(Received 22 February 2005; accepted 15 June 2005; published online 16 August 2005)

Measurements of form factors of asymmetric particle dimers composed of oppositely charged polystyrene latex particles are presented. These measurements are based on time-resolved static and dynamic light scattering on dilute aggregating aqueous suspensions. The experimental form factors are compared with independent calculations based on the superposition T-matrix method and Rayleigh-Debye-Gans (RDG) approximation. While the RDG approximation is found to be reliable only up to particle diameters of about 250 nm, the superposition T-matrix method is very accurate for all types of dimers investigated. The present results show clearly the appropriateness of the superposition T-matrix method to estimate the optical properties of colloidal particles in the micrometer range reliably.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
    1. Light scattering from early stages of heteroaggregation
    2. Computation of form factors of asymmetric dimers
  3. EXPERIMENT
    1. Light-scattering instrumentation
    2. Particle characterization and sample preparation
    3. Time-resolved aggregation studies
  4. RESULTS AND DISCUSSION
    1. Absolute aggregation rate constants
    2. Dimer form factors
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

light scattering, high-speed optical techniques, aggregation, suspensions, polymers

PACS

  • 82.70.Kj

    Emulsions and suspensions

  • 78.47.-p

    Spectroscopy of solid state dynamics

  • 78.20.-e

    Optical properties of bulk materials and thin films

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1996570

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    H. Holthoff, M. Borkovec, and P. Schurtenberger, Phys. Rev. E 56, 6945 (1997).

    D. A. Weitz, J. S. Huang, M. Y. Lin, and J. Sung, Phys. Rev. Lett. 54, 1416 (1985).


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