Fluctuations and phase transitions of uniaxial and biaxial liquid crystals using a theoretically informed Monte Carlo and a Landau free energy density

Villada-Gil, Stiven; Palacio-Betancur, Viviana; Armas-Pérez, Julio C.; de Pablo, Juan J.; Hernández-Ortiz, Juan P.

doi:10.1088/1361-648X/ab0394

Title: Fluctuations and phase transitions of uniaxial and biaxial liquid crystals using a theoretically informed Monte Carlo and a Landau free energy density

Journal Article · Fri Mar 01 00:00:00 EST 2019 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/ab0394· OSTI ID:1558006

Villada-Gil, Stiven ^[1];

^[2];

^[3];

^[4];

^[5]

Univ. Nacional de Colombia, Medellín (United States); Politécnico Colombiano Jaime Isaza Cadavid, Medellín (Colombia)
Univ. Nacional de Colombia, Medellín (United States); Univ. of Chicago, IL (United States)
Univ. de Guanajuato, Guanajuato (Mexico)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. Nacional de Colombia, Medellín (United States)

In this work, we explore fluctuations during phase transitions of uniaxial and biaxial liquid crystals using a phenomenological free energy functional. We rely on a continuum-level description of the liquid crystal ordering with a tensorial parameter and a temperature dependent Landau polynomial expansion of the tensor's invariants. The free energy functional, over a three-dimensional periodic domain, is integrated with a Gaussian quadrature and minimized with a theoretically informed Monte Carlo method. We reconstruct analytical phase diagrams, following Landau and Doi 's notations, to verify that the free energy relaxation reaches the global minimum. Importantly, our relaxation method is able to follow the thermodynamic behavior provided by other non-phenomenological approaches; we predict the first order character of the isotropic-nematic transition, and we identify the uniaxial-biaxial transition as second order. Finally, we use a finite-size scaling method, using the nematic susceptibility, to calculate the transition temperatures for 4-Cyano-4'-pentylbiphenyl (5CB) and N-(4-methoxybenzylidene)-4-butylaniline (MBBA). Our results show good agreement with experimental values, thereby validating our minimization method. Our approach is an alternative towards the relaxation of temperature dependent continuum-level free energy functionals, in any geometry, and can incorporate complicated elastic and surface energy densities.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Universidad Nacional de Colombia - Bogata; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1558006

Journal Information:: Journal of Physics. Condensed Matter, Vol. 31, Issue 17; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Title: Fluctuations and phase transitions of uniaxial and biaxial liquid crystals using a theoretically informed Monte Carlo and a Landau free energy density

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