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Structural behavior of a two length scale core-softened fluid in two dimensions

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  • Cardoso, Daniel Souza
  • Hernandes, Vinicius Fonseca
  • Nogueira, T.P.O.
  • Bordin, José Rafael

Abstract

2D competitive systems shows a large variety of solid and aggregate patterns, re-entrant fluid phase, a continuous melting as predicted by the KTHNY theory and, in some cases, waterlike anomalies. In this paper, we employ Langevin Dynamics simulations of a ramp-like core-softened fluid that have two characteristic length scales and all the features mentioned above. Analyzing the fluid phase of this system, Bordin and Barbosa (2018) reported the existence of two waterlike anomalous region. Now, we revisit this problem focusing in the low temperature regime and a larger range of densities looking for a relation between the origin of the anomalous behavior, the solid phases and the re-entrant melting. Now, not two, but three anomalous regions were observed. The extra anomalous regions are related to the re-entrant melting of a amorphous to a cluster fluid. They are ruled not only by the competition between the characteristic length scales in the potential, but also by extra competitions induced by the variety of particles conformations. These competitions extends from the solid to the fluid phase, reflecting in the structural waterlike anomaly. Our results shade some light in the complex behavior of two length scales competitive potential, and helps to elucidate the relation between the large number of solid phases and the existence of more than one waterlike anomalies region in these systems.

Suggested Citation

  • Cardoso, Daniel Souza & Hernandes, Vinicius Fonseca & Nogueira, T.P.O. & Bordin, José Rafael, 2021. "Structural behavior of a two length scale core-softened fluid in two dimensions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 566(C).
    • Handle: RePEc:eee:phsmap:v:566:y:2021:i:c:s0378437120309262
    DOI: 10.1016/j.physa.2020.125628
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    References listed on IDEAS

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    1. Tsiok, E.N. & Fomin, Y.D. & Ryzhov, V.N., 2018. "Random pinning elucidates the nature of melting transition in two-dimensional core-softened potential system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 490(C), pages 819-827.
    2. Fomin, Yu.D. & Tsiok, E.N. & Ryzhov, V.N., 2019. "The stripe phase of two-dimensional core-softened systems: Structure recognition," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 527(C).
    3. Barros de Oliveira, Alan & Barbosa, Marcia C. & Netz, Paulo A., 2007. "Interplay between structure and density anomaly for an isotropic core-softened ramp-like potential," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 386(2), pages 744-747.
    4. Jeffrey R. Errington & Pablo G. Debenedetti, 2001. "Relationship between structural order and the anomalies of liquid water," Nature, Nature, vol. 409(6818), pages 318-321, January.
    5. Bordin, José Rafael, 2018. "Distinct aggregation patterns and fluid porous phase in a 2D model for colloids with competitive interactions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 495(C), pages 215-224.
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    1. Nogueira, T.P.O. & Bordin, José Rafael, 2022. "Patterns in 2D core-softened systems: From sphere to dumbbell colloids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 605(C).

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