Abstract
Dynamic light scattering (DLS) is a method of studying dynamics in a system, in most cases translational diffusion dynamics. The technique is primarily used for particle sizing, i.e., to determine the hydrodynamic radius from the particle diffusion constant. DLS can be applied over a wide size range, from nanometers to micrometers. In the case of polydisperse systems, one can simply determine the mean size and a polydispersity index from a cumulant analysis or, by a more complicated method, one can calculate the size distribution of the system via an inverse Laplace transformation. Rotational diffusion constants can be determined by using depolarized DLS. Normally, DLS experiments are performed at high dilution to avoid concentration effects. On the other hand, particle interactions can also be studied by DLS. In this case, one must measure the correlation function for a series of different concentrations. Arrested dynamics in non-ergodic systems can be studied by DLS using special instrumentation.
Published Version
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