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The phase diagram and melting scenarios of two-dimensional Hertzian spheres

Fomin, Yu. D. ; Gaiduk, E. A. ; Tsiok, E. N. ; Ryzhov, V. N.

Molecular physics, 2018-11, Vol.116 (21-22), p.3258-3270 [Periódico revisado por pares]

Abingdon: Taylor & Francis

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  • Título:
    The phase diagram and melting scenarios of two-dimensional Hertzian spheres
  • Autor: Fomin, Yu. D. ; Gaiduk, E. A. ; Tsiok, E. N. ; Ryzhov, V. N.
  • Assuntos: Computer simulation ; Density ; density anomaly ; Elastic deformation ; Formability ; Herzian disks ; Macromolecules ; Melting ; phase diagram ; Phase diagrams ; Quasicrystals ; two-dimensional melting
  • É parte de: Molecular physics, 2018-11, Vol.116 (21-22), p.3258-3270
  • Descrição: We present computer simulations of a system of purely repulsive soft colloidal particles interacting via the Hertz potential and constrained to a two-dimensional plane. This potential describes the elastic interaction of weakly deformable bodies and can be a reliable model for a qualitative description of behaviour of soft macromolecules, such as globular micelles and star polymers. We have found a large number of ordered phases, including dodecagonal quasicrystal, and analysed the melting scenarios of low-density triangle and square phases. It is interesting that depending on the position on the phase diagram, the system can melt both through the first-order transition and in accordance with the Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young scenario (two continuous transitions with an intermediate hexatic phase) as well as according to recently proposed two-stage melting with the first-order hexatic-isotropic liquid transition and continuous solid-hexatic transition. We have also demonstrated the possibility of a tricritical point on the melting line and have found the line of a water-like density anomaly on the phase diagram.
  • Editor: Abingdon: Taylor & Francis
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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