Abstract
A theoretical model, encompassing the concentration fluctuations of associated and unassociated species, has been developed in order to explain the non-Landau behavior observed in self-associating fluids in the hydrodynamic regime. The complex dynamics for the formation of different species is depicted as a pseudo two-components system formed by unbound molecules coexisting with a unique associated specie, the mean aggregation number of which is dictated by thermodynamic requirements. The model has been tested in the case of a hydrogen-bonding system, 1-octanol, over a wide range of temperatures and wave vectors. The model explains, albeit qualitatively, most of the observed deviations from the Landau behavior observed in the Rayleigh–Brillouin spectra at different values of the k-vector.
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