And, as shown in Figure 1 below, the size range over which each instrument is useful overlaps significantly.įigure 1: Size ranges of common particle analysis techniques. Both techniques analyze the data using the assumption that the particle is a perfect sphere. angle is a direct function of particle size. Particle motion is less important since scattered intensity vs. In laser diffraction, particle size is determined from the measured variation in the intensity of scattered light as a function of scattering angle. For these measurements, particle motion is important to the results. Particle motion is interpreted as free diffusion and converted to size. In dynamic light scattering, particle motion is determined from measured fluctuations in the intensity of scattered light. Therefore, the question of which to choose is common.įirst, let us briefly review the techniques. HORIBA offers both the LA-960V2 Laser Diffraction Particle Size Analyzer and the SZ-100V2 Dynamic Light Scattering Analyzer for nanoparticle (submicron) particle characterization. In some cases, laser diffraction measurements can be faster than DLS measurements. Rapid measurements - results generated in less than a minute. The main reasons for its success are: Wide dynamic range - from submicron to the millimeter size range. Sometimes, there is a clear reason to choose one or the other. Both techniques are very fast (a few minutes). Laser diffraction is a widely used particle sizing technique for materials ranging from hundreds of nanometers up to several millimeters in size. For many nanoparticle or submicron particle size samples, both laser diffraction and dynamic are viable analysis techniques.
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