Laser Diffractometry

In laser diffractometry, a suspension or powder sample is pumped through a measuring cell and illuminated by a laser beam. When particles of different sizes pass through the laser beam, they cause the laser light to scatter at angles inversely proportional to their size. The angular scattering intensity data is analyzed to calculate the particle size, using either the Mie scattering or Fraunhofer diffraction theory.

The Mie theory is applied for smaller and transparent particles, where the refractive index of the material plays a crucial role in the scattering pattern. The Fraunhofer approximation, a special case of Mie theory, is used for larger particles, where the optical properties of the sample are less significant.

• Particle size analysis of propellants
• Characterization of abrasives and coatings
• Analysis of composite materials

• Particle size distribution of paints and coatings
• Characterization of abrasives and polishing materials
• Analysis of brake pad materials

• Particle size distribution of catalysts
• Characterization of pigments and fillers
• Analysis of raw materials for chemical processes

• Particle size analysis of inks and toners
• Characterization of LCD and LED materials
• Analysis of materials for 3D printing

• Particle size distribution of explosives
• Characterization of camouflage materials
• Analysis of protective coatings and paints

• Particle size analysis of coal and biomass
• Characterization of materials for solar cells
• Analysis of materials for batteries and fuel cells

• Particle size distribution analysis for forensic investigations
• Characterization of trace evidence
• Analysis of gunshot residue

• Particle size analysis of phosphors
• Characterization of materials for LED packaging
• Analysis of materials for light-emitting diodes

• Particle size distribution of implant materials
• Characterization of drug delivery systems
• Analysis of materials for prosthetics

• Particle size analysis of active pharmaceutical ingredients (APIs)
• Characterization of excipients
• Analysis of materials for drug formulations

• Particle size distribution of minerals and ores
• Characterization of construction materials
• Analysis of raw materials for glass and ceramic production

• Particle size analysis of materials for chip manufacturing
• Characterization of materials for photovoltaics
• Analysis of materials for electronic devices

• Particle size distribution of materials for optical fibers
• Characterization of materials for data storage devices
• Analysis of materials for telecommunication equipment

• Wide dynamic range (0.02 μm – 2000 μm)
• Applicable to powders and suspensions
• High sample throughput and easy operation
• Accuracy and reproducibility
• Robustness and low maintenance requirements

The sample amount required for laser diffractometry depends on the particle size. Typically, a few grams of sample are sufficient for most analyses. The sample should be well-dispersed in a suitable liquid or air stream for accurate measurements