Analyses et surface
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Laser diffraction particle size analyser



Definitions

Particle size measurement : particles size distribution study, in a dry environment (powders, sands, flours…) or in a liquid suspension (syrups, emulsions, suspensions…).

Particle size measurement by laser diffraction : this technique is based on laser beam diffraction and diffusion by particles.

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Describing of the measurement set-up

Principle

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Granulometric distribution
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Granulometric distribution

Light from a laser is shone on a cloud of particles, which are suspended in a dispersant (gas or liquid).The particles scatter the light, the larger the particles the smaller the scattering angles. The scattered light is measured by a series of photodetectors placed at different angles. This is known as the diffraction pattern for the sample. The diffraction pattern can be used to measure the size of the particles using Mie or Fraunhofer theory.

Obtained results allow to draw a curve, called particle size distribution (volumic distribution), and to calculate parameters such as mean diameter, d(0,1), d(0,5), d(0,9)…

Equipment

MASTERSIZER 2000 (Malvern Instruments)

Dispersion units : SCIROCCO 2000 (dry dispersion) and HYDRO 2000SM (liquid dispersion).

DispersionApplicationDispersion unitSize range
dry powders SCIROCCO 2000 200 nm – 2 mm
liquid suspensions HYDRO 2000SM 20 nm- 2 mm