The light scattered by these particles contains information about the diffusion speed and thus about the size distribution. Multiple light scattering is an important issue in modern laser diffraction spectrometry. Smaller particles move faster, larger particles move more slowly. Both techniques analyze the data using the assumption that the particle is a perfect sphere. Laser diffraction and dynamic light scattering (DLS) Dynamic Light Scattering (DLS) is based on the Brownian motion of particles in suspensions. 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. Weerd, C.D., Thoenes, D., Goossens, H.W.J.: Laser diffraction spectrometry: Fraunhofer diffraction versus mie scattering.
#Laser diffraction vs dynamic light scattering free
Particle motion is interpreted as free diffusion and converted to size. This method is used to measure particles from 0.3 nm 10 m (particle diameter).
Dynamic Light Scattering Dynamic Light Scattering is another option for particle sizing.
In dynamic light scattering, particle motion is determined from measured fluctuations in the intensity of scattered light. While laser diffraction can measure size, it is also important to note that it cannot analyze the shape of the particle. 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. Sometimes, there is a clear reason to choose one or the other. For many nanoparticle or submicron particle size samples, both laser diffraction and dynamic are viable analysis techniques. Laser diffraction (LD) analysis, also known as static light scattering, is the most common method for the determination of particle size distributions other.
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