Dynamic Light Scattering Theory

Dynamic Light Scattering (DLS) is a technique used to measure the size of tiny particles, like molecules or nanoparticles, in a liquid. When a laser light hits these particles, it scatters in different directions. Because the particles are constantly moving due to thermal energy, the pattern of scattered light fluctuates over time. By analyzing these fluctuations, scientists can determine how fast the particles are moving, which relates directly to their size—the smaller the particle, the faster it moves. DLS thus provides a way to accurately assess particle size distributions in solutions.