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Distinct aggregation patterns and fluid porous phase in a 2D model for colloids with competitive interactions

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  • Bordin, José Rafael

Abstract

In this paper we explore the self-assembly patterns in a two dimensional colloidal system using extensive Langevin Dynamics simulations. The pair potential proposed to model the competitive interaction have a short range length scale between first neighbors and a second characteristic length scale between third neighbors. We investigate how the temperature and colloidal density will affect the assembled morphologies. The potential shows aggregate patterns similar to observed in previous works, as clusters, stripes and porous phase. Nevertheless, we observe at high densities and temperatures a porous mesophase with a high mobility, which we name fluid porous phase, while at lower temperatures the porous structure is rigid. triangular packing was observed for the colloids and pores in both solid and fluid porous phases. Our results show that the porous structure is well defined for a large range of temperature and density, and that the fluid porous phase is a consequence of the competitive interaction and the random forces from the Langevin Dynamics.

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  • 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.
    • Handle: RePEc:eee:phsmap:v:495:y:2018:i:c:p:215-224
    DOI: 10.1016/j.physa.2017.12.090
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    References listed on IDEAS

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    1. Wu, Jianlan & Cao, Jianshu, 2006. "Ground-state shapes and structures of colloidal domains," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 371(2), pages 249-255.
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    Cited by:

    1. 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).
    2. de Moraes, Elizane Efigenia & Tonel, Mariana Zancan & Fagan, Solange Binotto & Barbosa, Marcia C., 2020. "Atomistic model derived from ab initio calculations tested in Benzene–Benzene interaction potential," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 537(C).
    3. 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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