We can analyze nanoparticle size distribution and identify nanoparticles using Dynamic Light Scattering (DLS). This technique is sometimes called Photon Correlation Spectroscopy. DLS uses a laser to track the Brownian motion of particles, particularly nanoparticles.
In the liquid phase, particles move randomly in every direction. Smaller particles typically travel faster than larger ones. This faster movement occurs because liquid molecules transfer energy to the solid particles. Consequently, nanoparticles experience greater energy transfer than larger and heavier particles.
The measurement range of DLS has limitations. Larger particles are too heavy to display Brownian motion and settle too quickly. Therefore, the upper size limit for this technique is approximately 10 micrometers. The primary focus of dynamic light scattering is clearly on the nanoparticle size range.
DLS can identify and measure nanoparticles as small as 3 nanometers. This capability makes it a valuable tool for nanoparticle analysis in various applications.
Dynamic Light Scattering nanoparticles – Particle Size Analysis and Airborne Nanoparticles
Dynamic Light Scattering (DLS) provides valuable information on the hydrodynamic particle size of nanoparticles in the liquid phase. To analyze the size distribution of nanoparticles released into the air as airborne nanoparticles, we use the EN 17199-4 small rotating drum methodology. This method employs an electronic impactor and a nanoparticle counter for precise measurement.
Like electron microscopy and differential centrifugal sedimentation, DLS serves as a confirmatory technique. Following the European Commission’s guidelines on nanomaterial identification, DLS offers direct evidence of the presence of nanoparticles. It also provides insights into the nanoparticle size distribution, supporting regulatory compliance and research efforts.
