dorsal/arxiv
View SchemaDifferent Particle Sizes Obtained from Static and Dynamic Laser Light Scattering
| Authors | Yong Sun |
|---|---|
| Categories | |
| ArXiv ID | physics/0405155 |
| URL | https://arxiv.org/abs/physics/0405155 |
Abstract
Detailed investigation of static and dynamic laser light scattering has been attempted in this work both theoretically and experimentally based on dilute water dispersions of two different homogenous spherical particles, polystyrene latexes and poly($N$-isopropylacrylamide) microgels. When Rayleigh-Gans-Debye approximation is valid, a new radius $R_{s}$, referred to as a static radius, can be obtained from the static light scattering $(SLS) $. If the absolute magnitude of the scattered intensity and some constants that are related to the instrument and samples are known, the average molar mass for large particles can be measured. The size information obtained from SLS is purely related to the optical properties of particles, i.e., to $R_{s}$ and its distribution $G(R_{s}) $. The size information obtained from dynamic light scattering $(DLS) $ is more complicated, the size distribution of which is a composite distribution that is not only related to the optical properties of particles, but also related to the hydrodynamic properties and the scattering vector. Strictly speaking, an apparent hydrodynamic radius $R_{h,app}$ 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}) $ that is also a function of both $R_{s}$ and the scattering vector $q$.
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"abstract": "Detailed investigation of static and dynamic laser light scattering has been\nattempted in this work both theoretically and experimentally based on dilute\nwater dispersions of two different homogenous spherical particles, polystyrene\nlatexes and poly($N$-isopropylacrylamide) microgels. When Rayleigh-Gans-Debye\napproximation is valid, a new radius $R_{s}$, referred to as a static radius,\ncan be obtained from the static light scattering $(SLS) $. If the absolute\nmagnitude of the scattered intensity and some constants that are related to the\ninstrument and samples are known, the average molar mass for large particles\ncan be measured. The size information obtained from SLS is purely related to\nthe optical properties of particles, i.e., to $R_{s}$ and its distribution\n$G(R_{s}) $. The size information obtained from dynamic light scattering $(DLS)\n$ is more complicated, the size distribution of which is a composite\ndistribution that is not only related to the optical properties of particles,\nbut also related to the hydrodynamic properties and the scattering vector.\nStrictly speaking, an apparent hydrodynamic radius $R_{h,app}$ is a composite\nsize obtained from averaging the term $\\exp (-q^{2}D\\tau) $ in the static size\ndistribution $G(R_{s}) $, with the weight $R_{s}^{6}P(q,R_{s}) $ that is also a\nfunction of both $R_{s}$ and the scattering vector $q$.",
"arxiv_id": "physics/0405155",
"authors": [
"Yong Sun"
],
"categories": [
"physics.bio-ph",
"physics.chem-ph"
],
"title": "Different Particle Sizes Obtained from Static and Dynamic Laser Light Scattering",
"url": "https://arxiv.org/abs/physics/0405155"
},
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