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and another is the density fluctuation of the solvent fluid where the solute molecules move. We believe that the first concept is most likely not the origin of the anomalous decrease of diffusivity near the critical point. There are two facts that disagree with this concept. Firstly, if the clustering would have a restrictive role on the solute movement, the diffusivity would be expected to have an anomalous behaviour at densities where the maximum local density enhancement has been observed. Secondly, a repulsive mixture should not exhibit an decrease in diffusivity but rather an increase as the solute molecule is in the middle of a cavitation and has a lot of room to move. In other words it is not the clustering, which forbids the solute from moving. The anomalous diffusivity has been observed for an attractive solute at infinite solution at density close to the critical one as well as a repulsive solute. This phenomenon has been observed for both systems in the region of the phase diagram, which is characterised by spatially extended fluctuations in the fluid density. We believe the extent of these fluctuations is related to the anomalous solute diffusion coefficient for both, the attractive and the repulsive solute. In order to understand the anomalous diffusivity, it is necessary to realize the nature of the microenvironment around the solute. Furthermore, it is necessary to understand beyond the description provided by the radial distribution function around the solute, as this indicator describes only the average of all the environments found within the fluid. For an attractive solute, the distribution of microstructures containing the solute is changing rapidly over the time near the critical point. The same is happening for a repulsive solute too. The rapid rearrangement of the microstructure around the solute does not give free space for the solute to move. The instantaneous environment around the solute in a short range changes so dramatically with time, that 139PDF Image | MOLECULAR SIMULATION STUDIES IN THE SUPERCRITICAL REGION
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