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Why is Ionic Strength Relevant to DLS Measurements?

Colloidal stability and the role of screened electrostatics. The measurement of particle size by dynamic light scattering (DLS) is heavily dependent on the stability of materials being investigated. Interactions between simple, spherical, colloidal particles are most frequently described by a balance between attractive and repulsive interactions. For freely diffusing particles, it is these repulsive interactions that minimize the frequency of collisions between particles, as well as reduce the probability that a given collision will result in two surfaces sticking, and thus result in colloidal stability.