Measurement of Small Polydispersities by Photon Correlation Spectroscopy
Photon correlation spectroscopy (PCS) of scattered laser light is possibly the most widely used technique for sizing submicron particles suspended in liquids.1 Its advantages are that it is reasonably rapid and, being based on measurement of the particles’ natural Brownian motion, non-invasive. A disadvantage of the method, as normally practiced, is its relative insensitivity to polydispersity which precludes the study of narrow particle size distributions (PSD). In this brief report we describe a relatively new method of analysing PCS data to provide significant information about the distribution of slightly polydisperse spherical particles; a more detailed account can be found in Reference 2.
KeywordsPhoton Correlation Spectroscopy Narrow Particle Size Distribution Scattered Laser Light Photon Correlation Spectroscopy Colloidal Sphere
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