What is dynamic light scattering?

Dynamic light scattering (DLS), also known as photon correlation spectroscopy (PCS) or quasi-elastic light scattering (QELS), is a technique used to determine the size distribution of particles in suspension or polymers in solution. It works by shining a laser through a sample and analyzing the fluctuations in the intensity of the scattered light. These fluctuations are caused by the Brownian motion of the particles, which is related to their size. Smaller particles move faster and cause quicker fluctuations. DLS is commonly used in various fields, including materials science, chemistry, biology, and pharmaceuticals, to characterize nanoparticles, colloids, proteins, and other macromolecules.