What is difference between laser diffraction and dynamic light scattering?
In dynamic light scattering, particle motion is determined from measured fluctuations in the intensity of scattered light. In laser diffraction, particle size is determined from the measured variation in the intensity of scattered light as a function of scattering angle.
What is laser diffraction used for?
Laser diffraction is a widely used particle sizing technique for materials ranging from hundreds of nanometers up to several millimeters in size. The main reasons for its success are: Wide dynamic range – from submicron to the millimeter size range. Rapid measurements – results generated in less than a minute.
Can we measure the size of the nanoparticles using laser diffraction?
In addition to microscopy and DLS, laser diffraction, which works on the Mie and Fraunhofer scattering theory, has also been employed for particle size measurement. These laser diffraction instruments are quite capable of measuring particle size in the range of a few nanometers to several microns.
What is laser diffraction particle size analyzer?
Laser diffraction particle size analyzers are used to measure the sizes of particles in a material. Particle size is calculated by measuring the angle of light scattered by the particles as they pass through a laser beam.
What is DLS and SLS?
The evaluation of the fluctuations is commonly named as dynamic light scattering (DLS) while the analysis of the absolute mean intensity is known as static light scattering (SLS). The intensity is very sensitive to variations in size of the solutes, so that it is advantageous to investiagte aggregation in solution.
What is laser light scattering technique?
During laser light scattering (also known as laser diffraction, laser diffractometry, Fraunhofer diffraction or Mie scattering), a laser beam passes through a dispersed particulate sample, large particles scatter light at small angles relative to the laser beam and small particles scatter light at large angles.
What are the two types of diffraction?
There are two main classes of diffraction, which are known as Fraunhofer diffraction and Fresnel diffraction.
What is meant by laser diffraction?
Laser Diffraction is, by definition, an ensemble technique. Laser Diffraction consists of scattering laser light off an assembly of particles and collecting the scattered light using a spacial array of detectors. The signal from the detectors is really a pattern of scattered/diffracted light vs. angle.
What does D10 D50 and D90 mean?
D10: The portion of particles with diameters smaller than this value is 10% D50: The portions of particles with diameters smaller and larger than this value are 50%. Also known as the median diameter. D90: The portion of particles with diameters below this value is 90%.
What is dynamic light scattering used for?
DLS is most commonly used to analyze nanoparticles. Examples include determining nanogold size, protein size, latex size, and colloid size. In general, the technique is best used for submicron particles and can be used to measure particle with sizes less than a nanometer.
What are the types of scattering?
There are three different types of scattering: Rayleigh scattering, Mie scattering, and non-selective scattering.