Dynamic+Light+Scattering

Dynamic light scattering can determine the size distribution of particles in solution. This technique is based on the fact that light scatters in all directions when it hits a small particle in solution. If a monochromatic laser is used then time dependant fluctuations in scattering intensity can be observed. The fluctuations are due to the fact that the particles are undoing Brownian motion and scattering will experience constructive or destructive interference by surrounding particles. From these fluctuations the diffusion coefficient can be calculated and give the size of the particle. The relationship between the diffusion coefficient and size is based on Brownian motion of spherical particles originally derived by Einstein. DLS can give the diameter of the particles
 * Dynamic Light Scattering **