Abstract
We have explored the feasibility of X-ray fluorescence correlation spectroscopy for studying the dynamics of colloidal particles in solution. We measured suspensions of Au nanoparticles from 5 to 150 nm diameter in water/glycerol mixtures of various compositions. Time-averaged sample properties were traced via small-angle X-ray scattering. The contrast of the measured time-correlation functions scales as expected with the particle concentration in the sample. The time constants for translational diffusion and sedimentation in water/glycerol mixtures follow only qualitatively the expected behaviour.
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