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Home / Covalent Academy / Particle Analysis for Industrial Product Success

Particle Analysis for Industrial Product Success

In this webinar, Dr. Sophia Yan will be guiding an exploration of the field of particle characterization: what is entails, why it matters, and how it’s done. Her talk will also highlight key considerations for the industrial applications of these techniques, and comment on some practical aspects of instrumentation.

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Download Slides (.pdf)
Download Q&A (.pdf)

This Webinar will Answer:

  1. What particle properties are important to analyze?
  2. What techniques are used to analyze particle size and distribution? How do these techniques operate?
  3. Why is particle analysis helpful when working to optimize consumer products?
  4. What are some examples of particle analysis applications in industry?

Q&A Session

Can you talk a little bit about the ability of DLS measure PSD’s of similar samples. If there is a bimodal suspension, how different do the particles need to be for DLS to be effective?

DLS is able to differentiate bimodal suspension if one population of the particles are at least three times bigger than the other population in the suspension.

For the same sample, if you measure with DLS, laser diffraction and SEM, would the size be comparable? If not, what is the reason?

Particle size measured by SEM should overlap with particle size distribution curve measured by laser diffraction. Particle size measured by DLS should be slightly bigger than that measured by SEM and laser diffraction. This is because hydrodynamic diameter measured by DLS refers to the diameter of hydration sphere for the particle, which includes actual particle and the solvent layer surrounding the particle.

What standards do you use and how you use them?

For DLS, we use the 220 nm NIST traceable polystyrene particle size standard provided by Anton Paar for periodic instrument performance check. This standard is a liquid suspension and can be directly transferred to cuvette for DLS measurement.

For Laser Diffraction, we use the 10-100 µm NIST traceable polydisperse particle size standard provided by Anton Paar for periodic instrument performance check. This standard is a dry powder. It can either be directly used for dry dispersion measurement or dispersed in distilled water for wet dispersion measurement