Discussing the Relationship between the Static and Dynamic Light Scattering

Details Discussing the Relationship between the Static and Dynamic Light Scattering Discussing the Relationship between the Static and Dynamic Light Scattering

2004-10-11

arxiv.org/abs/physics/0410064v2

Physics

Chemical Physics

Scientific paper

Both the static $(SLS) $ and dynamic $(DLS) $ light scattering techniques are used to obtain the size information from the scattered intensity, but the static radius $R_{s}$ and the apparent hydrodynamic radius $R_{h,app}$ are different. In this paper, the relationship between SLS and DLS is discussed using dilute water dispersions of two different homogenous spherical particles, polystyrene latexes and poly($N$-isopropylacrylamide) microgels, with a simple assumption that the hydrodynamic radius $R_{h}$ is in proportion to the static radius $R_{s}$, when Rayleigh-Gans-Debye approximation is valid. With the assistance of the simulated data, the apparent hydrodynamic radius $R_{h,app}$ has been discussed. The results show that the apparent hydrodynamic radius is different with the mean hydrodynamic radius of particles and is a composite size obtained from averaging the term $\exp (-q^{2}D\tau) $ in the static size distribution $G(R_{s}) $ with the weight $R_{s}^{6}P(q,R_{s}) $.

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