dorsal/arxiv
View SchemaInvestigating Diffusion Coefficient Using Dynamic Light Scattering Technique
| Authors | Yong Sun |
|---|---|
| Categories | |
| ArXiv ID | physics/0612101 |
| URL | https://arxiv.org/abs/physics/0612101 |
Abstract
In this work, the Z-average, effective, apparent diffusion coefficients and their poly-dispersity indexes were investigated for dilute poly-disperse homogeneous spherical particles in dispersion where the Rayleigh-Gans-Debye approximation is valid. The results reveal that the values of the apparent and effective diffusion coefficients at a scattering angle investigated are consistent and the difference between the effective and Z-average diffusion coefficients is a function of the mean particle size, size distribution and scattering angle. For the small particles with narrow size distributions, the Z-average diffusion coefficient can be got directly at any scattering angle. For the small particles with wide size distributions, the Z-average diffusion coefficient should be measured at a small scattering angle. For large particles, in order to obtain a good approximate value of Z-average diffusion coefficient, the wider the particle size distribution, the smaller the scattering angle that the DLS data are measured. The poly-dispersity index of the effective diffusion coefficient at a scattering angle investigated is consistent with that of the Z-average diffusion coefficient and without considering the influences of noises, the difference between the poly-dispersity indexes of the Z-average and apparent diffusion coefficients is determined by the mean particle size, size distribution and scattering angle together.
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"abstract": "In this work, the Z-average, effective, apparent diffusion coefficients and\ntheir poly-dispersity indexes were investigated for dilute poly-disperse\nhomogeneous spherical particles in dispersion where the Rayleigh-Gans-Debye\napproximation is valid. The results reveal that the values of the apparent and\neffective diffusion coefficients at a scattering angle investigated are\nconsistent and the difference between the effective and Z-average diffusion\ncoefficients is a function of the mean particle size, size distribution and\nscattering angle. For the small particles with narrow size distributions, the\nZ-average diffusion coefficient can be got directly at any scattering angle.\nFor the small particles with wide size distributions, the Z-average diffusion\ncoefficient should be measured at a small scattering angle. For large\nparticles, in order to obtain a good approximate value of Z-average diffusion\ncoefficient, the wider the particle size distribution, the smaller the\nscattering angle that the DLS data are measured. The poly-dispersity index of\nthe effective diffusion coefficient at a scattering angle investigated is\nconsistent with that of the Z-average diffusion coefficient and without\nconsidering the influences of noises, the difference between the\npoly-dispersity indexes of the Z-average and apparent diffusion coefficients is\ndetermined by the mean particle size, size distribution and scattering angle\ntogether.",
"arxiv_id": "physics/0612101",
"authors": [
"Yong Sun"
],
"categories": [
"physics.chem-ph",
"physics.bio-ph"
],
"title": "Investigating Diffusion Coefficient Using Dynamic Light Scattering Technique",
"url": "https://arxiv.org/abs/physics/0612101"
},
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