Particle Characterization

Particle characterization portfolio contains three product lines - scattered light analysis, image analysis and surface and porosity measurements. Microtrac MRB is a leading supplier of laser diffraction (LD) systems - a versatile method for particle size determination where a laser beam is passed through a well-dispersed sample and the particle size is obtained by detecting the intensity of the scattered light. While small particles scatter light at larger angles, large particles scatter light at smaller angles relative to the laser beam. With the 3 Laser technology, the scattered light can be measured at various angles up to 163 degrees. On the other hand, Dynamic Light Scattering (DLS) is based on focusing the laser probe at the material interface and signal is evaluated by using a Fast Fourier Transformation. Furthermore, Dynamic Image Analysis (DIA) systems determine the shape of particles within the sample in a representative and detailed manner. Microtrac MRB's instruments for gas adsorption measurements enable calculating the Specific Surface Area via BET theory, as well as the pore size distribution where the size of analyzed pores ranges from several hundred nanometers down to the molecular size range. Moreover, some of the instruments for gas adsorption measurements enable catalyst evaluation, as well as density measurements. Mercury Porosymetry is another technique in the portfolio that s widely used for determining the pore size distribution (in the range of meso- and macropores) of solids. All of the aforementioned systems are used in numerous industry segments, including agricultural industry, geology, chemical, pharmaceutical and food industries, as well as for catalysis, building materials, glass, metal powders and plastics.

FAQ: Particle Characterization

How to ensure reliable particle size results?

Ensure the sample is representative of the whole batch. Properly disperse the sample, avoiding agglomeration. Use the correct, accurate optical model (refractive index) for your material.

What if the sample is soluble in water?

Use a non-polar solvent like Isopar or alcohol instead of water. Ensure the sample particles remain intact and do not dissolve during analysis.

What is the difference between Static and Dynamic Image Analysis?

Static (SIA) involves stationary particles (check Camsizer or if you want combination Microtrac Sync). Dynamic (DIA) captures particles in motion, providing better, faster, and more reproducible results for larger or irregular particles (Camsizer).

How to interpret the results for particle size analysis?

Microtrac software provides various metrics (for example D10, D50, D90, mean size). Ensure you are focusing on the relevant percentiles for your product specification.

How to properly prepare a sample for BET analysis?

Samples must be pretreated (activated) to remove adsorbed water or contaminants, typically using the MICROTRAC BELPREP series, which applies heat and vacuum without damaging the sample structure.

What is the difference between single-point and multi-point BET?

Single-point BET is generally used for faster quality control, while multi-point BET provides more accurate, detailed, and reproducible data. Microtrac offers solutions for both QC and research.

What gases are used for adsorption measurements?

Nitrogen is the standard, but you can use Argon or Carbon Dioxide or other gases.

Can multiple samples be measured at once?

Yes, the Microtrac Belsorp MAX X and related models allow for simultaneous measurement of multiple samples (for example up to four).

What should I do if my results are not reproducible?

Ensure the sample pretreatment (degassing) was sufficient and identical for all samples, check for leaks in the sample cell, and verify the sample mass is appropriate for the expected surface area. The best solution is to order BELPREP from Microtrac.

Is there an online solution?

Yes, Microtrac can offer online or process solutions where applicable.