3rd January 2002, 16:34
DLS & Multimodal size distributions
Dynamic Light Scattering is very useful for sub-micron particle size analysis. For simple PSDs that can be approximated by a single-peak uni-modal distribution, a Gaussian analysis gives reliable results.
However a cursory reading of literature indicates that this technique is not good at characterizing polydisperse particle size distributions (PSDs).
For sub-micron particles (say, 100nm- 2 micron range), what other particle size analysis methods are the forum readers aware of... i.e. a technique that can provide PSDs for sub-micron particles with a wide distribution (maybe multi-modal since the particles are the end result of a grinding operation). I am not interested in time-consuming methods such as imaging techniques like TEM.
Note: Typically, for my application, the solid particles are suspended in water or an organic liquid like hexane.
Thanks for any inputs.
19th August 2002, 22:40
DLS & Multimodal distributions
I just discovered this forum, so my reply is very delayed.
For the size range 100nm to 2 micron, there are static light scattering (Mie/Fraunhofer) instruments from several vendors that cover that size range and can easily measure multi-modal distributions.
DLS has in the past been limited in it's ability to accurately respond to multi-modal distributions, but there are a number of newer DLS instruments that use a different mathematical approach that responds well to multi-modes. I'm not sure of all the units on the market, but Horiba is one.
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