Waterlike anomalies in a 2D core-softened potential

TL;DR

This study explores waterlike anomalies in a two-dimensional core-softened particle system, revealing new regions of structural, density, and diffusion anomalies driven by competing length scales and particle conformations.

Contribution

It demonstrates the existence of novel anomalous regions in 2D systems with core-softened potentials, expanding understanding of waterlike behaviors beyond 3D.

Findings

New structural, density, and diffusion anomaly regions identified in 2D system.

Anomalies at lower densities due to competition between potential length scales.

Higher density anomalies linked to particle conformations and melting.

Abstract

We investigate the structural, thermodynamic and dynamic behavior of of a two dimensional core-corona system using Langevin Dynamics simulations. The particles are modeled using a core-softened potential that exhibits waterlike anomalies for the 3D case. For quasi-2D systems we have observed previously a new region of structural anomaly. Now, our results show that a new region of structural, density and diffusion anomalies arises for the 2D system. Our findings indicates that while the anomalous region at lower densities observed is due the competition between the two length scales in the potential, the traditional mechanism, the higher densities anomalous region is related to changes in the particles conformation and a melting region.