Аномальное поведение жидкостей в трехмерном и двумерном пространствах

Abstract

Using a molecular dynamics method water-like anomalies in a core-softened system depending on the potential parameters and space dimension were investigated. We have examined the anomalies of density, diffusion and structure and have shown that the sequence of anomalous regions cardinally depends on the repulsive step width and space dimension. Thus, in a three-dimensional (3D) system with small values of the step width the sequence of anomalous regions is the same as in water, whereas in a two-dimensional (2D) system – as in liquid silica. With an increase in the step width, an inversion of the regions of the diffusion anomaly and of the density anomaly is observed. Such an unusual sequence of anomalous regions different from water and liquid silica is exclusively caused by the step width and does not depend on the space dimension.