Brownian motion is a subject of renewed interest since the development of photon correlation
spectroscopy (PCS) in the last decade. The dynamic properties of microemulsions and colloidal
systems are studied by measuring the relaxation of concentration fluctuations. The mixture of C12E5nanoemulsion with PEG have been studied by small-angle X-ray scattering and dynamic light
scattering in order to determine structure and dynamic of the system. Light scattering
experiment shown an exponential relaxation for pure C12E5 nanoemulsion that the shape of
the relaxation change with increasing of polymer concentration in the C12E5 nanoemulsion,
that relaxation becomes non-exponential, which demonstrates increase of cooperatively in the
C12E5 nanoemulsion.
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