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Heating leads to liquid-crystal and crystalline order in a two-temperature active fluid of rods

Chattopadhyay, J and Pannir-Sivajothi, S and Varma, K and Ramaswamy, S and Dasgupta, C and Maiti, PK (2021) Heating leads to liquid-crystal and crystalline order in a two-temperature active fluid of rods. In: Physical Review E, 104 (5).

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Official URL: https://doi.org/10.1103/PhysRevE.104.054610


We report phase separation and liquid-crystal ordering induced by scalar activity in a system of soft repulsive spherocylinders (SRSs) of shape anisotropy L/D=5 using molecular dynamics (MD) simulations. Activity is introduced by increasing the temperature of half of the SRSs (labeled hot) while maintaining the temperature of the other half constant at a lower value (labeled cold). The difference between the two temperatures scaled by the lower temperature provides a measure of the activity. Starting from different equilibrium initial phases, we find that activity leads to segregation of the hot and cold particles. Activity also drives the cold particles through a phase transition to a more ordered state and the hot particles to a state of less order compared to the initial equilibrium state. The cold components of a homogeneous isotropic structure acquire nematic and, at higher activity, crystalline order. Similarly, the cold zone of a nematic initial state undergoes smectic and crystal ordering above a critical value of activity while the hot component turns isotropic. We find that the hot particles occupy a larger volume and exert an extra kinetic pressure, confining, compressing, and provoking an ordering transition of the cold-particle domains. © 2021 American Physical Society.

Item Type: Journal Article
Publication: Physical Review E
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to Authors
Keywords: Molecular dynamics; Phase separation, Cold particles; Crystal order; Crystalline order; Hot particles; Liquid crystalline; Liquid-crystals; Lows-temperatures; Nematics; Shape anisotropy; Spherocylinders, Liquid crystals
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Dec 2021 05:55
Last Modified: 21 Dec 2021 05:55
URI: http://eprints.iisc.ac.in/id/eprint/70709

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