Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS), is a commonly used characterization method for nanoparticles. 1）The DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability for the measurement of nanoparticles. The DLS particle size analyzer has the advantages of accuracy, rapidity, and good repeatability for the measurement of Nano particles, emulsions or suspensions.
With the latest DLS instrument and the development of improved data processing technology, the current dynamic light scattering instrument
not only has the ability to measure particle size, but also to measure Zeta potential and molecular weight of molecules.
The principle of DLS of dynamic light scattering is that Nano-particles, emulsion droplets and molecules in suspension are moving due to collisions caused by liquid molecules due to Brownian motion. When a laser interacts with these dynamic particles or molecules, fluctuations in the intensity of the scattered light are caused. The frequency of the fluctuation depends on the velocity of the particle, which is directly related to the size of the particle (because the smaller the particle size, the faster it moves and the larger the particle the slower it moves under the effect of the Brownian motion).
Therefore, the velocity of particle Brownian motion will be obtained by analyzing the intensity fluctuation of scattered light, and the particle size and particle size distribution of nanoparticle can be obtained by using Stokes-Einstein equation.