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José Rafael Bordin1, Marcia C Barbosa2

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This study reveals two anomalous regions in the pressure-temperature phase diagram for two-dimensional (2D) core-corona systems, impacting structure, density, and diffusion. These anomalies arise from competing length scales and melting line reentrance.

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Area of Science:

  • Condensed matter physics
  • Statistical mechanics
  • Materials science

Background:

  • Core-softened potentials in 3D exhibit waterlike anomalies.
  • Quasi-2D systems show structural anomalies in pressure-temperature phase diagrams.

Purpose of the Study:

  • Investigate structural, thermodynamic, and dynamic behavior of 2D core-corona systems.
  • Identify and characterize anomalous regions in the 2D pressure-temperature phase diagram.

Main Methods:

  • Langevin dynamics simulations.
  • Modeling particles with a core-softened potential.

Main Results:

  • Observed two distinct regions of structural, density, and diffusion anomalies in the 2D phase diagram.
  • Lower density anomalies linked to competing length scales in the potential.
  • Higher density anomalies associated with the reentrance of the melting line.

Conclusions:

  • The 2D core-corona system exhibits complex anomalous behavior.
  • Anomalies are sensitive to density and potential characteristics.
  • Findings extend understanding of waterlike anomalies in reduced dimensions.