It is very difficult to say which method is more suitable (for example, Fraunhofer model or Mie model.) and which instrument is more suitable (for example , Beclman Counter, LS 13 320 or Masterisizer 2000). Since different methods will generate different results and even using the same method the result will be different for different factors.
For samples contain more than two different types of particles make things more complicated.
For comparing different batches of materials (on which the percentage of two different types of particles may very). It would be difficult to know if the values of factor can be kept unchanged.
How to find a method /instrument which is/are less sensitive but still reliable.
To choose the measurement method is in some sense like to choose a camera. If we use auto camera to take photographs then we will be able get a reasonable photo and we do not need to do too much work to adjust the parameters. However if we use a professional camera then we can get a photograph with much better quality on the condition that we set the parameters right. However, it will be possible that we get a photograph which does not make any sense if we set the parameter wrong, for example, if we set the camera out of focus. So we need a method which works like auto camera and do not need a method that works like a professional manual camera which is too complicated
Malvern Mastersizer 3000 is good for analysis and gives reliable results. It has Broad measurement range: from 10 nm to 3.5 mm
with exceptional resolution in the sub-micron range. data acquisition rates of 10 kHz increase reproducibility and ensure accuracy even for materials with the broadest size distributions
The main difference between different equipment is the type of laser source and detector. You can check with supplier for such information.
Base on our experience, LS13320 has better sensitivity at smaller particle size (sub nanometer), which make is more powerful in academic research.
And Malvern is the leader in industrial applications, and they are involved to make different particle size characterization standards.
Attention has to be paid that the results achieved with different equipment are usually not comparable, that is why you applications need to be defined before choosing right equipment.
The best approach is the microscopic technique followed by laser diffraction. I have worked extensively with the Camsizer from Retsch Technology GmbH. Its an excellent device to study particle size and shape of a certain population on the mass basis. I recommend the same.
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